Over pressure of wells during Hydraulic Fracturing jobs can be very costly to Companies. Some examples of cost that could occur are: Damage to the Customers well and potential lose of future business with that Customer. Testing and replacement of line iron if exceeded that rating of the iron. Equipment damage Down time and standby time Employees hurt on location.

1. Compass Instruments, LLC, Tomball,
Texas is now accepting orders for their
new patented safety device that not
only provides superior data, but also
provides almost instantaneous
shutdown when the smart sensor
determines an over pressure condition
is about to occur.
No matter if you are fracturing or
cementing a well, pumping liquid
nitrogen to blow out a pipeline,
pumping through a coil tubing unit, or
what ever the application; we all know
that accidents can happen. And the
damage to personnel and equipment
can be devastating.
This new device resides on each pump
between the control system and the
discharge pressure transmitter and
has wireless communication with the
data van..
Upon power up, it auto-calibrates the
pressure transmitter without changing
the signal level sent back to the control
system. As soon as the auto-calibrate
function is finished, the device will
output a clean, corrected, super
accurate 4 to 20 milliamp signal to
the control instrumentation.
The discharge pressure input to the
regular pump controller can be
calibrated by implementing a pressure
‘CAL’ command. This causes the
smart sensor to output 20 milliamps
A monitoring system inside the data
van allows operator input for setting
the over pressure shutdown value.
This information is then sent to each
pump unit via a wireless transceiver.
Each pump unit then responds by
sending back the actual discharge
pressure.
The data van monitoring system also
receives information from the well
head pressure transmitter. The well
head pressure and the over pressure
shutdown is displayed in larger
numbers in the upper portion of the
display. On the lower portion of the
display, the over pressure shutdown
value is plotted against the actual well
head pressure, with time and date.
The data received from each pumping
unit, the wellhead pressure, the over
pressure shutdown value, and the
time and date are all saved in memory
and may be exported to a USB
memory stick.
NEW SMART OVER PRESSURE SENSOR DETECTS
HAZARDOUS CONDITIONS BEFORE THEY OCCUR
COMPASS
INSTRUMENTS , LLC
A NEW PATENED SAFETY DEVICE THAT OFFERS
REAL PROTECTION FOR HIGH PRESSURE PUMPING
D E C E M B E R 2 1 , 2 0 1 5T O M B A L L , T E X A S
FEATURES
 FILTERS THE PRESURE
SIGNAL FOR STABLE
DISPLAY, CHARTS
AND DATA LOGGING
 AUTOCALIBRATES
THE PRESSURE
TRANSMITTER AT THE
BEGINNING OF EVERY
JOB.
 DISPLAYS ACTUAL
PRESSURE AND OVER
PRESSURE SHUT-
DOWN VALUES
 PROVIDES A SHUT-
DOWN OUTPUT
SIGNAL IN LESS THAN
1 MILLISE.OND WHEN
THE SMART SENSOR
DETERMINES THAT A
HAZARDOUS
CONDITION IS ABOUT
TO HAPPEN.
 WARNS OF A
PRESSURE
TRANSMITTER WITH
AN OUTPUT OUTSIDE
THE NORMAL RANGE.
 COMMUNICATES
WIRELESSLY WITH
THE DATA VAN SO
THERE ARE NO WIRES
OR CABLES,
SIMPLIFYING SET-UP.
 WIRELESS UNIT IN
DATA VAN DISPLAYS
AND DATA LOGS
WELL HEAD PRESSURE
AND PRESSURE FROM
EACH PUMP.

2. P A G E 2
We believe
every life has
considerable
value. We
want to do
everything
we can to
protect those
we love and
our fellow
workers.
The Smart Sensor
At the heart of this unit is the Smart Sensor which synchronizes and
communicates with the discharge pressure transmitter, calibrating the
internal circuitry to the actual range of the pressure transmitter.
The input signal from the discharge pressure transmitter is also affected by
special proprietary circuitry to reduce or eliminate the pressure spikes
caused by the action of the fluid ends.
Working with clean data allows the pressure slope to be calculated to
determine if an over pressure condition is about to occur, if so, a shutdown
command is given immediately to both the engine and transmission.
This unit also contains a two line display which indicates discharge pressure
on one line and the over pressure shutdown value on the other. In the
event the pressure transmitter is out of range or not functioning, this
information will also be displayed.
Finally, a shutdown output connects to the engine and transmission to stop
the pump when a hazardous condition occurs. From the time the hazardous
condition occurs until the shutdown output is activated should be less than
10 milliseconds.
A shutdown command may also be implemented in the data van and
transmitted via the wireless system to every pump, while this can be
broadcast quickly to all the pumps at the same time, it must be understood
that the wireless transmission is not instantaneous.
“Warning” and “strobe” outputs are triggered when the pressure in the high
pressure line exceeds 20 and 30 PSI respectively. A strobe light is supplied
with the system and can connect to either of these outputs to let the
operators know that there is still pressure in the high pressure line.
H & H Technical Services has been contracted to install and certify all these
systems. They will first check to see what engines and transmissions are on
your units, verify how they are programmed, then define what signal is
required for shutdown and which connector and pin we should connect to.
Custom over-molded cables are then made and H & H Technical Services
will schedule a time to install and certify the system on each truck.
A N E W P A T E N E D S A F E T Y D E V I C E

3. The Data Van Display
P A G E 3T O M B A L L , T E X A S
Data is displayed on a
monitor with a display
area 23” wide and only
9.75” tall. Wireless linking
with all the pump units on
location is automatic and
requires no special
operator skills.
With the data van in place
and powered up, apply
power to each of the
pump units one at a time
and they will be displayed
on the screen in the order
in which they were
initialized.
As they initialize, any
errors detected on the pump
will be displayed. Non criti-
cal errors will disappear
when acknowledged.
Critical errors may require
maintenance, such as
replacing a bad cable or
changing out a pressure
transmitter that is out of
range.
Critical errors will clear
automatically when the
problems causing the errors
have been corrected.
Once the errors are clear,
the pump’s discharge
pressure is displayed on
the left side of the screen.
Up to 40 pump units may be
used with one display.
The display is driven by a
computer mounted on a
plate just behind the display.
A cable from the computer
connects to a joystick which
allows the operator to clear
non-critical errors, set the
over pressure shutdown
limit, and do other general
functions.
The computer also connects
to a wireless module which
communicates with all the
pump units.
the van. The function of this unit is to
filter the 4-20 milliamp signal from the
wellhead for display, charts, and/or
data logging.
This unit also has a serial output that
connects to the data van display.
Wellhead pressure and over pressure
shutdown are displayed in large
numbers across the top area of the
display. On the lower part of the
display these same two values are
plotted on the screen real time, with
time and date.
The Over Pressure Shutdown is the pres-
sure not to exceed. Since this can be dif-
ferent on every job, it must be program-
mable. It can be easily incremented or
decremented using the joy stick.
If the wellhead pressure gets close to the
over pressure shutdown value, the
displayed values will change color. If it
actually reaches the over pressure
shutdown value, the displayed values will
be bright red.
The wellhead pressure transmitter
connects to a smart sensor in the back of
Wellhead Pressure &
Over Pressure Shutdown
“Having clear
decisive data is
enough to settle
many disputes”

4. From the beginning, our motto has been,
“Innovation with Direction.” We feel this is
another product that is worthy of our motto.
It provides stable pressure data for display and data logging.
It checks and auto calibrates the discharge and well head pres-
sure transmitters.
It provides a considerably faster output for over pressure to set
the engine to idle and the transmission to neutral.
And the smart feature of being able to predict an over pressure
condition before it happens can:
 Prevent injury and/or death of personnel.
 Prevent the destruction of valuable equipment.
 Prevent exceeding the rating of the high pressure iron.
 Prevents exceeding the over pressure set point—so pre-
vents liability of damage to well.
321 S. PERSIMMON ST
TOMBALL, TX 77375
Phone: 832.698.2047
Fax: 281.476.6575
E-mail:
SALES@COMPASSINSTRUMENTS.COM
OTHER FEATURES
 A warning output provides a signal to a remote
indicator light and is active when there is more
than 20 PSI (this is programmable) in the high
pressure line.
 A strobe output provides a signal to a remote
strobe light (supplied) and is active when there
is more than 30 PSI (again programmable) in
the high pressure line.
COMPASS INSTRUMENTS, LLC
Compass Instruments, LLC “Innovation with Direction”
Compass Instruments has been providing industrial electronic instrumentation to oil/gas well service companies since
2007. In 2011 we became Compass Instruments, LLC. And in 2013 we added a complete sheet metal fabrication
shop. In 2014 we purchased our own facility in Tomball, Texas and now have our electronics instrumentation group
and sheet metal fabrication group all under one roof.
Compass Instruments, LLC is large enough to supply your instrumentation needs, yet small enough to react to your
specific requirements. We are well staffed with a great group of knowledgeable and caring employees who have many
years of experience.
Other companies attempt to play the game of competition, building products as economically as possible to fight for
market share over price. We feel we have no competition on the standard products we sell because we better un-
derstand our market. Therefore we want our products to be designed smarter, be made with higher quality compo-
nents, operate over a wider temperature range, stand up to higher shock and vibration, and have functions that just
make sense.
It is true that we do not always compete with others on price, but then you get what you pay for. For example our
12VDC to 24VDC converter outputs 10 amps. We have a competitor who builds a unit with the same form, fit, and
function—they begin failing after two years, and by year four, they will for sure have to be replaced. We begin selling
our unit in 2008 and have since sold thousands, and to date have never had one returned from the field because it
failed. Cost? Ours is about twice the cost initially. But you will pay more to have a technician replace theirs than
what the difference is. And then we won’t consider the cost of a failure during a critical point in a job.
WHAT IS PROVIDED WITH THIS SYSTEM?
The C-SMART SAFETY SYSTEM is supplied as a
complete system with everything needed and even
includes installation and certification.
On each pumping unit, it connects between your 4-
20 mA pressure transmitter and your instrumentation.
Custom cables connect to the engine and transmis-
sion for quick shut-down in the event of a hazardous
condition.
The Data Van unit connects between the 4-20 mA
pressure transmitter at the well head and the data
van pressure input.