H2600 HY-ALERTA SAFETY SYSTEMS – HY-ALERTA 2600

HY-ALERTA™ 2600
Explosion Proof Area Hydrogen Monitor
OPERATING MANUAL
28486 Westinghouse Place, Suite 100
Valencia, California 91355, U.S.A.
Tel: 1-(661) 775-9575 / Fax: 1-(661) 775-9515
E-mail: sales@h2scan.com
Website: http://www.h2scan.com

HY-ALERTA™ 2600 Explosion Proof Area Hydrogen Monitor
OPERATING MANUAL
90000015 R5, International Release Page 2 of 29 ECO 10-062
Mission Statement
 To become the leading provider of hydrogen specific safety
monitoring and in-line process measurement systems where
hydrogen gas is produced, used, consumed, stored and
transported.
 We are committed to providing cost-effective solutions as new
installations and replacements for existing hydrogen gas
analyzers to OEM customers and through our global distribution
network.
 Our products will achieve worldwide recognition in industrial
safety and process applications based on superior products, while
maintaining excellent relationships with and ensuring
unsurpassed value to our business partners around the globe.

OPERATING MANUAL
CONTENTS
1 SPECIFICATIONS.............................................................................................................5
2 DESCRIPTION ..................................................................................................................7
2.1 System .....................................................................................................................................................7
2.1.1 Sensor Module.................................................................................................................................7
2.1.2 Control Module.................................................................................................................................7
3 INSTALLATION ................................................................................................................8
3.1 Unit Location...........................................................................................................................................8
3.2 Hydrogen Sensing Considerations.......................................................................................................8
3.3 Sensor Module........................................................................................................................................9
3.3.1 Sensor Module Mounting .................................................................................................................9
3.3.2 Gas Connection ...............................................................................................................................9
3.3.3 Sensor Module Wiring....................................................................................................................10
3.4 Control Module .....................................................................................................................................11
3.4.1 Control Module Mounting...............................................................................................................11
3.4.2 Display Board.................................................................................................................................11
3.4.3 Control Module Wiring....................................................................................................................12
3.4.3.1 AC Power Wiring............................................................................................................................12
3.4.3.2 Output Signal Wiring ......................................................................................................................13
3.4.3.3 RS422 Interface Wiring..................................................................................................................13
3.4.3.4 Sensor Cable Wiring ......................................................................................................................14
4 OPERATION ...................................................................................................................15
4.1 Startup ...................................................................................................................................................15
4.2 Settings..................................................................................................................................................15
4.3 Infrared Remote Control ......................................................................................................................15
4.3.1 Configuration Menu........................................................................................................................15
4.4 Serial Communication..........................................................................................................................22
5 MAINTENANCE ..............................................................................................................27
5.1 Cleaning.................................................................................................................................................27
5.2 Field Calibration....................................................................................................................................27
5.2.1 Gases.............................................................................................................................................27
5.2.2 Calibration ......................................................................................................................................27
5.2.3 Clear Field Cal ...............................................................................................................................28

OPERATING MANUAL
IMPORTANT NOTICES
Read and understand this operating manual before
operating or servicing the unit.
HYDROGEN IS FLAMMABLE AT 4% IN AIR. TAKE INDICATIONS SERIOUSLY AND BE
PREPARED TO TAKE ACTION. IN THE EVENT OF DETECTION OF 4% OR HIGHER OF
A HYDROGEN GAS CONCENTRATION THERE IS A HIGH PROBABILITY OF A
HAZARD TO SAFETY. INFORM LOCAL EMERGENCY RESPONSE PERSONNEL
IMMEDIATELY.
LIMITATION OF LIABILITY
IN THE EVENT OF A DEFECT IN A PRODUCT, H2SCAN SHALL NOT BE RESPONSIBLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES RESULTING
THEREFROM, INCLUDING, BUT NOT LIMITED TO, LOSS OF REVENUE AND/OR PROFIT.
LIMITED WARRANTY
H2scan Limited Warranty. Each hydrogen instrument (“Product”) will conform, as to all substantial operational
features, to the Product specifications set forth this Manual and will be free of defects which substantially affect
such Product’s performance for twelve (12) months from the ship date for such Product.
Must Provide Notice of Defect. If you believe a Product is defective, you must notify H2scan in writing, within ten
(10) days of receipt of such Product, of your claim regarding any such defect.
Return Product to H2scan for Repair, Replacement or Credit. If the Product is found defective by H2scan, H2scan’s
sole obligation under this warranty is to either (i) repair the Product, (ii) replace the Product, or (iii) issue a credit
for the purchase price for such Product, the particular remedy to be determined [by H2scan] on a case-by-case
basis.
Voided Warranty. H2scan’s 12 Month Limited Warranty is void for any of the following:
 The unit is opened and the manufacturing seal is broken
 Unauthorized repair work performed at the customer’s location or carried out by anyone other than
H2scan’s factory trained technicians
 Equipment or parts that have been tampered with, misused, neglected, mishandled, improperly adjusted,
or modified in any way without the written consent of H2scan.
 Equipment or parts that have been damaged due to shipping, misuse, accidents, mishandling, neglect, or
problems with electrical power sources.
 Repair work performed during the warranty period does not prolong the warranty period past the original
period.
 System operation in incorrect or inappropriate environments.
 Usage that is not in accordance with system guidelines or an operator’s failure to follow manual
instructions.
Limitation of Warranty. THE ABOVE IS A LIMITED WARRANTY AS IT IS THE ONLY WARRANTY MADE BY H2SCAN.
H2SCAN MAKES NO OTHER WARRANTY EXPRESS OR IMPLIED AND EXPRESSLY EXCLUDES ALL WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. YOUR SOLE REMEDY HEREUNDER IS REPAIR OR
REPLACEMENT OF THE PRODUCT OR A CREDIT FOR THE PURCHASE PRICE FOR SUCH PRODUCT, THE PARTICULAR
REMEDY TO BE DETERMINED BY H2SCAN ON A CASE-BY-CASE BASIS. H2SCAN SHALL HAVE NO LIABILITY WITH
RESPECT TO ITS OBLIGATIONS UNDER THIS AGREEMENT FOR CONSEQUENTIAL, EXEMPLARY, OR INCIDENTAL
DAMAGES EVEN IF IT HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. THE STATED EXPRESS
WARRANTY IS IN LIEU OF ALL LIABILITIES OR OBLIGATIONS OF H2SCAN FOR DAMAGES ARISING OUT OF OR IN
CONNECTION WITH THE DELIVERY, USE OR PERFORMANCE OF THE PRODUCTS.

OPERATING MANUAL
1 Specifications
Sensitivity Range:
0.4% to 5% hydrogen by volume at 1ATM in air,
10% to 125% hydrogen lower flammable limit
Accuracy:
± (0.03 x indication + 0.2) percent hydrogen by volume,
example: accuracy at 1% H2 is ±0.23% H2
Response Time: T90 of 60 sec maximum
Temperature:
Ambient Temperature: 4°C to 60°C (40°F to 140°F)
Storage: -40 to +50 °C
Humidity: 0% to 95% RH
Radiation: 350 Rads TID
Input Power: 90VAC to 260VAC, 15W, 50Hz to 60Hz
Analog Output:
Isolated and self-powered 4-20mA,
Maximum load impedance: 700Ω
Relay Contacts:
Two programmable 5A, 250VDC/VACMAX SPDT relays
with both normally open (N.O.) and normally closed (N.C.)
contacts.
Serial Communication: RS422
Controls:
Full access to all maintenance and calibration functions
via infrared remote control
Sensor Wiring: 8-pair, 22AWG (up to100')
AC Power Wiring: 3-wire,14AWG
4-20mA Output Wiring: 1-pair, 22AWG
RS-422 Output Wiring: 2-pair, 22AWG
Verification Interval: 90 days
Dimensions: See following figures (dimensions in inches)
Sensor Module Weight: 2.6kg (5.8lbs)
Control Module Weight: 2.7kg (5.9lbs)
Product Life Expectancy: 10 years
Explosion Proof Housing Certifications:
(Sensor Assembly Not Certified)
Class I, Groups B, C, D
Class II, Groups E, F, G
Class III
Type 4X
Class I, Zone 1, AEx d IIC
Ex d IIC
IP 66
UL 1203
FM3615
CSA C22.2 No. 30
UL 50
UL 60079-0/UL 60079-1
CSA 60079-0/CSA 60079-1
IEC 60529

OPERATING MANUAL
Figure 1: Control Module Dimensions (in inches)
Figure 2: Sensor Module Dimensions (in inches)

OPERATING MANUAL
2 Description
2.1 System
H2scan’s HY-ALERTA™ 2600 Explosion Proof Area Hydrogen Monitor provides
hydrogen-specific leak detection and measurement for hydrogen concentrations as
low as 4000ppm and can be scaled to any concentration up to 5% hydrogen by
volume, a range representing 10% to 125% of hydrogen’s lower flammability limit.
H2scan’s hydrogen-specific sensor technology has no cross sensitivity to other
combustible gases, eliminating false positive alarms and ensuring safety system
reliability. The HY-ALERTA™ 2600 consists of two modules and a wireless remote
control. The Sensor Module houses the hydrogen sensor and the Control Module
houses the LCD display and control circuitry.
2.1.1 Sensor Module
The sensor module is in an explosion proof enclosure and is designed to be
mounted on either the ceiling or wall above areas where hydrogen gas is stored or
transported. It has ¾ inch NPT fittings at the two interface conduit ports and is
painted “safety blue.” The Sensor Cup Assembly enables the installation of the
plumbing required for the on-site calibration of the hydrogen sensor.
2.1.2 Control Module
The Control Module is in an explosion proof enclosure with a glass window to view
the LCD. The operational menus for the HY-ALERTA™ 2600 are accessed by an
Infrared Remote Control through the glass window to the Control Module. This
module receives the input power, delivers the isolated self-powered 4ma to 20mA
analog output, provides the relay output signals, and establishes RS422 serial
communication. It has ¾ inch NPT fittings at its three conduit ports and is painted
“safety blue.”

OPERATING MANUAL
3 Installation
Warning: if the unit is installed in a restricted location
then it is the responsibility of the user and installer to
make connections to related equipment in a manner
consistent with the location classification.
3.1 Unit Location
Though the unit can be mounted in any orientation or position, it is important to
consider the possible sources and areas of accumulation of hydrogen gas. Typical
installations are near the ceiling level or on the ceiling above equipment using or
storing hydrogen. For earlier detection, artificial means of accumulation such as flat
plates or inverted trays can be installed at lower heights to allow hydrogen to reach
the sensor more quickly.
Warning: it is not the intent of this manual to specify
mounting location(s). It is the responsibility of the user
and installer to determine the proper location(s) for
hydrogen detection based upon the particular uses of
hydrogen at the installation site.
3.2 Hydrogen Sensing Considerations
From any given source, hydrogen gas disperses rapidly and generally upward due
to the very low density of hydrogen compared to air. Understanding this behavior
allows technicians to more effectively position the sensor to detect hydrogen leaks.
If the sensor element is near (and above) the leak, the concentration will likely be
higher but the leak may be difficult to locate. As hydrogen dissipates (generally
above the leak), the concentration decreases. Generally, greater distances will
increase the chance of intercepting the leak stream, but if the sensor is too far
away, the response may be too weak to detect.
When drafts or air currents are present, hydrogen will tend to be dispersed.
Testing for hydrogen leaks downwind of the leak area may increase the chance of
detecting the leak. If hydrogen is rising in an enclosed building (where there may
be a layer of hot air near the ceiling), the hot air near the ceiling may have a lower
density and act to retard the hydrogen from continuing to rise as rapidly as it did in
lower layers of air. Thus, sensing hydrogen near ceiling areas with high
temperatures present may not be as effective.
Low temperatures can also affect the behavior of hydrogen. Hydrogen stored in a
liquid state is at an extremely low temperature. The low temperature of any
escaping hydrogen will be of a higher than normal density and may initially move
downward. As the hydrogen warms, it will begin to rise upward. When checking for
a leak in areas where liquid hydrogen is stored, check both above and below the
area of concern.

OPERATING MANUAL
3.3 Sensor Module
3.3.1 Sensor Module Mounting
Mounting is achieved with two ¼ inch screws through mounting holes in the base
of the explosion proof housing. ¾ inch solid conduit threaded into the enclosure
will also serve as further structural support. The housing can be mounted in any
orientation or position on ceilings, the preferred location for the Sensor Module.
When mounting the Sensor Module on walls, it is recommended to position the
sensor to the left or right of the Sensor Module rather than towards the floor or the
ceiling. When the sensor is directed towards the ceiling, dust and debris could
accumulate, blocking the sensor. Since hydrogen gas tends to accumulate at the
ceiling, directing the sensor towards the floor may move the sensor furthest away
from the highest hydrogen gas concentration.
Recommended Wall Mounted Sensor Module Positioning
Sensor directed to the left or right
Not Recommended Wall Mounted Sensor Module Positioning
Sensor directed up or down
3.3.2 Gas Connection
Gases are applied to the sensor during Field Calibration via ¼ inch tubing attached
to the Sensor Cup Assembly on the Sensor Module.
The Sensor Cup Assembly on the Sensor Module can be rotated to accommodate
the plumbing of the calibration gases applied to the sensor. Plumbing from the
Sensor Cup Assembly to the calibration control area is the responsibility of the
installer.

OPERATING MANUAL
3.3.3 Sensor Module Wiring
The Sensor Interface printed circuit board has a 16-pin terminal block, J1, for the
Sensor Cable connection to the Control Module. It is a two piece design in which
the wires are screwed into a receptacle in standard terminal block style. The
receptacle plugs into a header mounted on the Sensor Interface Board. This cable
provides DC power to the Sensor Module and digital communication signals
between Sensor and Control Modules.
Sensor Interface Board: J1 16-Pin Terminal Block for the Sensor Cable
Pin Number Function
1 Pair 1 +
2 Pair 1-
3 Pair 2 +
4 Pair 2 -
5 Pair 3 +
6 Pair 3 -
7 Pair 4 +
8 Pair 4 -
9 Pair 5 +
10 Pair 5 -
11 Pair 6 +
12 Pair 6 -
13 Pair 7 +
14 Pair 7 -
15 Pair 8 +
16 Pair 8 -
J1 pin 1

OPERATING MANUAL
3.4 Control Module
3.4.1 Control Module Mounting
Mounting is achieved with two ¼ inch screws through mounting holes in the base
of the explosion proof housing. ¾ inch solid conduit threaded into the enclosure
will also serve as further structural support. The Control Module is mounted in an
accessible location up to 100 feet away from the Sensor Module. This allows an
installation of the Control Module at an accessible eye-level position.
3.4.2 Display Board
The Display Board provides the LCD for local readouts and the infrared receiver for
the infrared remote control. The Display Board connects with the Interface Board
via a 10-pin cable. The cable allows the Display Board to be moved aside as
electricians are wiring the Control Module.
The Display Board is seated into place with four banana plugs so no tools are
required. The Display Board banana plug legs are inserted into standoffs arranged
in a symmetrical pattern so the Display Board is can be rotated into one of four
different 90 degree increments when installed. In this way, the LCD will be
displayed in the best position possible no matter how the Control Module enclosure
is mounted.

OPERATING MANUAL
3.4.3 Control Module Wiring
3.4.3.1AC Power Wiring
The Power Board has a 4-pin terminal block, J2, for the Power Cable connection to
input AC power. It is a two piece design in which the wires are screwed into a
receptacle in standard terminal block style, similar to the Sensor Module. If not
implementing separate chassis and signal ground connections, pins 3 and 4 should
be connected together with a jumper.
Power Board: J2 4-Pin Terminal Block for the Power Cable
Pin Number Function Description
1 LINE
Hot or active contact from 90VAC to
260VAC power supply providing the
alternating current
2 NEUTRAL
Contact completes the circuit, returning
the alternating current to the power
supply
3 CHASSIS GROUND
Safety connection to earth or ground to
take faulty currents directly to ground
4 SIGNAL GROUND
Common ground for sensitive circuitry
isolated from chassis ground; if not
implementing separate chasses and
signal ground connections, pins 3 and 4
should be connected together with a
jumper
J2 pin 1
J5 pin 1
J3 pin 1

OPERATING MANUAL
3.4.3.2Output Signal Wiring
The Interface board has an 8-pin terminal block, J5, for the Output Cable delivering
a 4mA to 20mA analog output and two SPDT relays available for alert and alarm
level switches. The two programmable relays have both normally open (N.O.) and
normally closed (N.C.) contacts.
Warning: do not exceed the 5A, 250Vdc/Vac maximum
ratings of the alert and alarm relay contact specifications.
Interface Board: J5 8-Pin Terminal Block for Output Cable
Pin Number Function Description
1 4-20mA+
2 4-20mA-
Isolated and self-powered 4-20mA analog output,
700Ω maximum load impedance
3 ALERT NC
4 ALERT COM
5 ALERT NO
SPDT Relay 1 for the Alert level of hydrogen
6 ALARM NC
7 ALARM COM
8 ALARM NO
SPDT Relay 2 for the Alarm level of hydrogen
3.4.3.3RS422 Interface Wiring
The Interface Board has a 4-pin terminal block, J3, for the RS422 Serial Interface
Cable.
Interface Board: J3 4-Pin Terminal Block for Serial Interface Cable
Description J3 Pin
TxD- (Device Transmit, Negative) 1
TxD+ (Device Transmit, Positive) 2
RxD- (Device Receive, Negative) 3
RxD+ (Device Receive, Positive) 4

OPERATING MANUAL
3.4.3.4Sensor Cable Wiring
The Interface Board has a 16-pin terminal block, J4, for the Sensor Cable connection
to the Sensor Module. The Sensor Cable can be a maximum length of 100 feet
using 22AWG cable.
Interface Board: J4 16-Pin Terminal Block for the Sensor Cable
Pin Number Function
1 Pair 1 +
2 Pair 1-
3 Pair 2 +
4 Pair 2 -
5 Pair 3 +
6 Pair 3 -
7 Pair 4 +
8 Pair 4 -
9 Pair 5 +
10 Pair 5 -
11 Pair 6 +
12 Pair 6 -
13 Pair 7 +
14 Pair 7 -
15 Pair 8 +
16 Pair 8 -

OPERATING MANUAL
4 Operation
4.1 Startup
Warning: before the system is powered on in a hazardous
environment, technicians must confirm a complete
system installation, including all electrical connections
and wiring, unused cable ports are plugged, and
explosion proof housing lids are screwed on tight and
locked into position.
Confirm all connections and apply power to the Control Module. Once power is
applied, the LCD will display “Warmup” as the monitor executes a warm-up
sequence lasting approximately 15 minutes. The Not Ready analog output during
this Power-On Self Diagnostic Test will be 2mA. When the test is over, the monitor
will come online, the LCD will read “Hydrogen = 0.0000%H2,” and the analog output
will be 4mA.
4.2 Settings
The monitor’s operational and output settings have been configured at H2scan.
The following analog output parameters are set at the factory:
 Analog Output Range: 4mA to 20mA
 Not Ready (Power-On Self Diagnostic) Output: 2mA
 Sensor Error Output: 3mA
 Hydrogen Range: 0% to 5% hydrogen by volume
Warning: if settings are changed from those set by the
manufacturer then it is the user’s responsibility to
understand the implications to the connecting equipment
monitoring the unit.
4.3 Infrared Remote Control
A 5 button Infrared Remote Control is used to access the Configuration Menu,
change settings and initiate Calibration. Each Remote Control is configured
specifically to communicate with its respective Control Module and is identified
with corresponding serial numbers. H2scan cannot guarantee reliable operation
between unmatched Remote Controls and Control Modules. If lost or damaged,
spare Remote Controls can be purchased directly from H2scan with reference to the
Remote Control and Control Module serial numbers.
4.3.1 Configuration Menu
The Keypad on the remote control is used to alter the display or initiate special
functions from the Configuration Menu:
 Pressing ▲ (up arrow button) displays the peak hydrogen reading.
 Pressing ▼ (down arrow button) displays the current percent hydrogen
concentration.
 Pressing ► (right arrow button) clears the peak hydrogen value.

OPERATING MANUAL
Pressing and holding the  button invokes the Configuration Menu.
 Pressing ▼ (down arrow button) scrolls down through function menus or
scroll down through a numerical range.
 Pressing ▲ (up arrow button) scrolls up through function menus or scroll up
through a numerical range.
 Pressing the  button or ► (right arrow button) selects the function.
 Pressing ◄ (left arrow button) backs out of menus.
The following functions are available found in the Configuration Menu:
 Information Disp – model information
o Firmware Rev – firmware revision
o Serial Number – model serial number
o Calibration Date – date of last factory calibration
 Configure Relays – configure hydrogen levels where relays actuate
o R1 Level – level of hydrogen detected where first relay will actuate;
Alert Level (standard factory setting: 1% hydrogen by volume)
o R2 Level – level of hydrogen detected where second relay will actuate;
Alarm level (standard factory setting: 2% hydrogen by volume)
 Set H2 Range – define hydrogen sensitivity range (standard factory setting:
0% to 5% hydrogen by volume)
o Low H2 Range – lowest level of hydrogen (standard factory setting:
0% hydrogen by volume) to correspond with the low range IDAC
setting
o High H2 Range – highest level of hydrogen (standard factory setting:
5% hydrogen by volume typical) to correspond with the high range
IDAC setting
 Configure IDAC – define analog output range (standard factory setting:
4mA to 20mA)
o Low Range – low level analog output (standard factory setting: 4mA)
to correspond with lowest level of hydrogen range
o High Range – high level analog output (standard factory setting:
20mA) to correspond with highest level of hydrogen range
o Error – analog output (standard factory setting: 3mA) of error status

OPERATING MANUAL
o Not Ready –analog output (standard factory setting: 2mA) of self-
diagnostic test
 Field Calibrate
o Calibrate Sensor – Field Calibration procedure
o Clear Field Cal - restores the instrument to the last factory calibration
 Exit – exit Configuration Menu to standard display output setting
Configuration Menu
See Hydrogen Menu
See Info Display Menu
See Relay Menu
See H2 Range Menu
See Configure IDAC Menu
See Field Calibrate Menu
Exiting Menu
Delay

OPERATING MANUAL
Hydrogen Menu
Information Disp Menu
3 Second Delay

OPERATING MANUAL
Configure Relay Menu
Set H2 Range Menu

OPERATING MANUAL
Configure IDAC Menu

OPERATING MANUAL
Field Calibrate Menu
Good? No
Yes
Good?No
Yes
Good?No
Yes

OPERATING MANUAL
4.4 Serial Communication
The user can monitor output and interface with the unit in order to perform
calibration or adjust user settings via the serial communication connector. The
serial communication is accomplished via an RS422 interface.
Serial Communications Software - Any serial port two-way communications
software such as terminal emulators (HyperTerminal, Telnet, etc.) and purpose-built
software (using LabView, Visual Basic, C++, etc.) can be used to establish serial
communication with the unit.
RS422Format and Settings –
 19200 Baud
 8 bit data
 1 stop bit
 No parity
Data Display – Streaming data is presented in column format. Once serial
communication is established and the unit is operating in normal mode, data will
be displayed in the user specified format. The display output options are
configured via a serial command as described in the following section. Data
available is:
<fmt> Format (these appear in their own columns)
 Timestamp (an integer count at 0.25 sec intervals)
 Printed Circuit Board (PCB) Temperature in C
 Sensor Temperature in C
 Raw Analog Data Converter (ADC) Values
 Calibrated Hydrogen Values
 Peak Hydrogen Values
<opt> Options (these status data appear in the MESSAGES column)
 Calculation Errors
 Heater State
What follows are examples of typical user specified outputs:
Example 1: Sample serial data with column headers– Calibrated H2% and Messages
only
Display User Response
H2scan: Type “g 02 06”
%H2 Messages
0.0000
0.0000
0.0000
Example 2: Sample serial data with column headers– Multiple Outputs Specified

OPERATING MANUAL
H2scan: Type “g b2 06”
Time stamp Pcb Temp Snsr Temp %H2 Messages
264 28.8530 124.50800 0.0000
280 29.1979 124.50910 0.0000
296 29.5169 124.51110 0.0000
312 29.7951 124.51320 0.0000
Serial Communication Commands – The unit can be communicated with and
configured via the use of commands as described below. Two levels of
communication outputs are available:
 Level 0 – Default level used for data monitoring and basic functions providing
a continuous stream of data readings
 Level 1 – Password protected level used for configuration of user-settable
parameters; interactive single-line data output per command
Command Summary – The RETURN or ENTER key is the last character of the
command string. If either key is pressed without a command string the result is an
invalid command and will resume continuous display if in Level 0 or return to
prompt if in Level 1.
Level 0 Commands
Keystroke Description
ESC
Stops continuous display to enter a password or command. If in
level zero, the continuous display will resume after executing one
command.
(spacebar)
Pressing the Space key while the serial output is active will
display a label line showing the heading for each column of data.
A Average readings.
C Clear peak hydrogen value.
=<password>
Enter the password to change security level. A null or invalid
password returns to the default security level.
Level 0 password (resume normal operation) =0
Level 1 password (enter user command mode) =h2scan

OPERATING MANUAL
Level 1 Commands
Keystroke Description
A <R1> <R2> Set the R1 and R2 set points for the relay contacts in %H2.
C Clear peak hydrogen value.
D <page>
Display Product Information. Enter page number 0-6 or A for all
pages, default is page 0.
0 – Product information
1 – User configuration
2 – Manufacturing information
3 – Product configuration
4 – Sensor characterization data
5 – Hydrogen calibration data
6 – Temperature calibration data
A – All of the above
E Field Verify
F Field Calibration
G < fmt> <opt>
Start or resume the sensor operation: if needed heat the ASIC,
setup the sensor, and output data on serial port (restores default
settings). For format <fmt> options see below.
H <low> <high> Set the hydrogen reporting range: <low> to <high> in %H2.
I <low> <high>
<err> <not rdy>
Set the DAC current output range: <low> to <high>; error output
<err>; and not ready output <not rdy> milliamps. Possible range
from 0 to 20 milliamps.
L < fmt> <opt>
Print current hydrogen reading. Used to poll for hydrogen
readings. Default format <fmt> is current setting.
P <atm>
Select atmospheric pressure of gas. Default pressure is 0.9690
atm.
R
Reset the sensor: depending on sensor configuration will purge
then zero the sensor before returning to normal operation.
S
Stop the sensor: turn off heater, set Bias to zero, set DAC outputs
to zero, and stop reporting data on the serial output.
V <low> <high>
<err> <not rdy>
Set the DAC voltage output range: <low> to <high>; error output
<err>; and not ready output <not rdy> in volts. Possible range
from 0 to 5 volts.
X
Clear field calibration data (returns to last factory calibration
data)

OPERATING MANUAL
Format <fmt> - The Format <fmt> string is a two character hexadecimal
representation of an 8 bit value derived from the following table. The user
determines which data is needed and selects that bit value. Once all selections are
made the values are summed bitwise and then converted to a two place
hexadecimal value. To aid in the conversion, a 4 bit to hexadecimal conversion
table follows in the following example.
Format: Bit Value Identifiers
Serial output Format <fmt> parameter: select the desired columns of
data from this list, add the bit value for each column bitwise, and
convert into two hexadecimal characters using the 4 bit-to-Hexadecimal
table in in the following example.
Description Bit Value
Include time stamp 1 0 0 0 0 0 0 0
Include raw ADC values 0 1 0 0 0 0 0 0
Include PCB temperature 0 0 1 0 0 0 0 0
Include sensor temperature 0 0 0 1 0 0 0 0
Include capacitor reading 0 0 0 0 1 0 0 0
Include resistor reading 0 0 0 0 0 1 0 0
Include overall hydrogen reading 0 0 0 0 0 0 1 0
Include peak hydrogen reading 0 0 0 0 0 0 0 1
Options <opt> - The Options <opt> string is a two character hexadecimal
representation of an 8 bit value derived from the following table. The user
determines which data is needed and selects that bit value. Once all selections are
made the values are summed bitwise and then converted to a two place
hexadecimal value. To aid in the conversion, a 4 bit-to-Hexadecimal conversion
table follows in the following example.
Options: Bit Value Identifiers
Serial output Options <opt> parameter: select the desired status
messages from this list which will appear in the MESSAGES column, add
the bit value for each column bitwise, and convert into two hexadecimal
characters using the 4 bit-to-Hexadecimal table in the following
example.
Description Bit Value
Calculation Errors 0 0 0 0 0 1 0 0
Heater State 0 0 0 0 0 0 1 0

OPERATING MANUAL
Example: The user wishes to implement the “G” command (“Go” command, refer to
the LEVEL 1 COMMANDS table) to have the following serial output columns
reported from the series HY-OPTIMA™ 1700 sensor: Time
Stamp, Capacitor Reading, Overall Hydrogen Reading, the
Peak Hydrogen Reading, Calculation Errors, and the Heater
state.
From the FORMAT <fmt> table above, you identify your
desired columns with its corresponding bit value:
<fmt> Descriptions <fmt> Bit Value
Time Stamp 1000 0000
Capacitor Reading 0000 1000
Overall Hydrogen Reading 0000 0010
Peak Hydrogen Reading 0000 0001
<fmt> 4 Bit Value Combination: 1000 1011
Now use the 4 BIT-TO-HEXADECIMAL table above to convert
this 4 bit value combination into a two place hexadecimal
value:
<fmt> Two Place Hexadecimal Value: 8b
From the OPTIONS <opt> table above, you identify your
desired columns with its corresponding bit value:
<opt> Descriptions <opt> Bit Value
Calculations Errors 0000 0100
Heater State 0000 0010
<opt> 4 Bit Value Combination: 0000 0110
Again, use the 4 BIT-TO-HEXADECIMAL table to convert this 4 bit value combination
into a two place hexadecimal value:
<opt> Two Place Hexadecimal Value: 06
Conclusion: To have the Time Stamp, Capacitor Reading, Overall Hydrogen
Reading, the Peak Hydrogen Reading, Calculations Errors, and Heater State columns
continuously reported, you will implement the “G” serial command (“Go” Command,
refer to LEVEL 1 COMMANDS table) as follows at the H2scan: command prompt: G
< fmt> <opt> = g 8b 06
H2scan: Type “g 8b 06”
4 bit
value
Hexadecimal
Character
0001 1
0010 2
0011 3
0100 4
0101 5
0110 6
0111 7
1000 8
1001 9
1010 A
1011 B
1100 C
1101 D
1110 E
1111 F

OPERATING MANUAL
5 Maintenance
5.1 Cleaning
If the monitor is exposed to debris, condensation or other material that may collect
over the sensor tip, then the monitor should be cleaned with the gentle wiping of a
clean, lint-free cloth or paper towel.
5.2 Field Calibration
5.2.1 Gases
Calibration requires the availability of the following certified gases (obtainable from
H2scan or gas suppliers):
 zero grade, hydrogen-free air
 2.00% hydrogen by volume in air (20,000 ppm)
5.2.2 Calibration
The Calibrate function allows the user to perform a field calibration of the
instrument. Calibrations do not cause any wear on the sensor and can be
accomplished as often as desired. Analog outputs can be monitored through the
user’s system. Below are the steps to carry out Field Calibration:
FIELD CALIBRATION STEPS
Step Display User response
1 Hydrogen = 0% Press the  button to enter the Hydrogen Menu.
2 Information Disp
Press ▼ four times until reaching the Field Calibrate
Menu.
3
Field Calibrate
XX/XX/XX Press the  button.
4 Calibrate Sensor Press the  button.
5
Calibrate Sensor
Continue? Press the  button.
6
Calibrate Sensor
In Progress Calibration starts.
7
Apply 0.000%H2
Continue?
Apply hydrogen-free, ultra-zero air to the Sensor
through the gas plumbing to the fitting on the cup of
the Sensor Module. Press the  button.
8
Apply 0.000%H2
In Progress 0% hydrogen by volume Calibration starts.
9
Apply 0.000%H2
Settle Checking sensor temperature.
10
Hydrogen = 0%
Wait XXXX Wait until xxxx = 0 for the sensor reading to stabilize.
11
Hydrogen = 0%
Finding Average Measuring sensor response to test gas.
12
Apply 2.000%H2
Continue?
Apply 2% hydrogen by volume with a balance of air to
the Sensor through the gas plumbing to the fitting on
the cup of the Sensor Module. Press the  button.

OPERATING MANUAL
FIELD CALIBRATION STEPS
13
Apply 2.000%H2
14
Apply 2.000%H2
15
Hydrogen = 2%
16
Hydrogen = 2%
17
Apply 0.000%H2
Continue?
Apply hydrogen-free, ultra-zero air to the Sensor
through the gas plumbing to the fitting on the cup of
the Sensor Module. Press the  button.
18
Apply 0.000%H2
19
Apply 0.000%H2
20
Hydrogen = 0%
21
Hydrogen = 0%
22
Enter Date:
1.0000 M
Select the current month (1-12) using the ▲ and ▼
keys. Press the  button.
23
Enter Date:
1.0000 D
Select the current day (1-31) using the ▲ and ▼ keys.
Press the  button.
24
Enter Date:
6.0000 Y
Select the current year (2007=7, 2012=12, etc.) using
the ▲ and ▼ keys. Press the  button.
25
Calibrate Sensor
Done Press the  button.
26
Field Calibrate
XX/XX/XX Press ▼.
27 Exit Press the  button.
5.2.3 Clear Field Cal
The Clear Field Calibration function restores the instrument to the last factory
calibration. Once entered into the Clear Field Calibration function (see Section
4.3.1), the user is prompted through the routine as follows:
1
Clear Field Cal
Are you sure?
Press the  button to clear field calibration values, any
other key to exit.

OPERATING MANUAL
QUESTIONS?
PLEASE CONTACT US AT:
28486 Westinghouse Place, Suite 100
Valencia, California 91355, U.S.A.
Tel: (661) 775-9575 / Fax: (661) 775-9515
E-mail: sales@h2scan.com
Website: http://www.h2scan.com
Manual copyright © 2008, H2scan
Instrument software copyright © 2006, H2scan
Wide Range SensorTM
protected under US patent number 5,279,795

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