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A C C U R A C Y • Q U A L I T Y • P E R F O R M A N C E
Heat Calculator
Model 212
Features
I Multilingual capability
I Heating, cooling and air condi-
tioning
I Built-in density and enthalpy
tables
I Meter-bus interface and RS485
communications
I Metric or US units
I 4-wire Pt100 RTD temperature
inputs
I Fully programmable
I Calculates and displays
Volume, Energy, Temperatures
and Peak Energy
I Watertight to IP66 (Nema 4X)
I High accuracy Overview
The 212 Heat Calculator is designed to
measure the energy consumed in hot
water heating systems and chilled water
cooling systems.
The 212 will interface with a wide range
of flowmeters, including vortex and
magnetic flowmeters with pulse outputs,
positive displacement and inferential
water meters, turbine and paddle wheel
flowmeters.
Provides flexibility to meet all
applications
The 212 is able to cross international
boundaries in heat meter applications.
Multilingual capability, data logging and
peak/off-peak operation are standard. In
addition, four modes of operation cover-
ing heating and cooling ensure that the
212 is flexible enough to meet all energy
measurement applications.
The high accuracy of the 212 ensures
that it meets European and International
approvals for heat calculators.
Accuracy to OIML R75 Class 4
and EN1434
The 212 has in-built correction for the
non-linearity of the RTDs. For chilled
water measurement where the tempera-
ture difference (∆t) is likely to be small,
provision is made in the set-up program
to zero out any offset between RTDs.
The 212 is fully programmable and all
set-up data and totals are stored in a
non-volatile memory for a minimum of
10 years.
Watertight wall or panel
mount enclosure
The 212 Heat Calculator is housed in a
rugged yet attractive IP66 (Nema 4X)
rated polycarbonate enclosure which is
completely watertight.
Mounting is either by a wall bracket or
by panel mount.
Integration with energy manage-
ment systems
A Meter-bus interface enables the 212
Heat Calculator to be incorporated into
energy management systems complying
with European IEC 870-5 protocol stan-
dards.
The 212 is also supplied with an RS485
bus, which uses industry standard
Modbus RTU protocol, for interfacing to
computers and DCS systems.
Datalogging flexibility
The 212 Heat Calculator will store ener-
gy totals by hour, day, week or month
for up to 31 periods. The totals are
stored for each period and can be
downloaded to a computer via the
Meter-bus or RS485 communications
ports.
Peak and off-peak registers
If selected, the peak/off-peak feature
will assign two separate registers which
will totalize peak energy and off-peak
energy.
The changeover times between peak
and off-peak are fully programmable.
Modes of Operation
The 212 Heat Calculator is flexible
enough to handle a wide range of appli-
cations. Four operating modes are avail-
able.
I Heating Mode where positive ∆t's
only are totalized.
I Cooling Mode where negative ∆t's
only are totalized.
I Heating/Cooling Mode where the
flow of energy may be for heating or
cooling. In this mode the energy total
is increased regardless of whether ∆t
is positive or negative.
I Charge/Discharge Mode where two
separate registers totalize positive
and negative totals.
Calculates the density and
enthalpy of water
The 212 Heat Meter measures the tem-
perature in the feed and return lines
and, from this, calculates the density
and enthalpy of the water.
By also measuring the volume of water
flowing in the system, the 212 will then
compute the energy consumed.
Power is calculated as:
P = V x pp x (hTV - hTR)
where P = Power (W)
V = Volumetric flow rate (m3
/s)
pp = Density (kg/m3
)
hTV = Specific enthalpy (J/kg)
at Feed temperature
hTR = Specific enthalpy(J/kg)
at Return temperature
The volume, energy, temperatures and
peak energy are all calculated and can
be displayed on the large LCD.
Heat Calculator
Model 212
A C C U R A C Y • Q U A L I T Y • P E R F O R M A N C E
General
Display
Type: 7 digit LCD - 7 numeric digits and
11 alpha characters.
Digits: 15.5mm (0.6”) high.
Characters: 6mm (0.24”) high.
Display Units: kWh, MWh, MJ, GJ, therm, BTU x 1000,
tons x hours (refrigeration).
Maximum Thermal Power
3000MW
Measurement Time
0.3s.
Accuracy OIML R75 Class 4 and EN 1434.
Power Requirements
DC Power: 12 to 24V DC @ 100mA maximum.
Physical
Temperature
Operating: 5 to 55°C.
Storage: -20 to 70ºC.
Environmental Class
EN1434 Classes A & C.
Enclosure
Protection: IP66 (Nema 4X) watertight.
Materials: Polycarbonate and ABS.
Mounting Options
Wall: Wall mount bracket.
Panel: Mounting clips.
Inputs
Flowmeter
Type: Frequency or pulse between 0.01Hz
to 20KHz. Default low frequency cutoff
is 0.25Hz.
K-factor Range: Programmable in the range 0.001 to
999,999.9 pulses per litre, m
3
, US gallon
or ft3
.
Signal Type: Pulse, open collector, reed switch, proximi-
ty switch or coil.
Location: In either the return or feed lines.
Temperature
Type: 4-wire Pt100 RTDs to IEC 751. 1
/10 DIN.
Location: 1 x Feed Line and 1 x Return Line.
Linearisation: Built-in RTD linearisation.
Temp. Range: -10 to 220°C (1 to 200°C approved).
Temp. Difference: 1 to 200K (2 to 199K approved).
Measurement Time:
15s
Cable Length: <50m.
Connection: G1/2B.
Outputs
Pulse
Type: Open collector will sink up to 100mA, 30V
DC maximum.
Width: 10ms.
Function: Volume or Energy (scaled).
Frequency: 1 pulse every preset number of units of
energy or volume total.
Alarm
Type: Two solid state opto-isolated relays which
will sink up to 100mA, 30V DC maximum.
Function: High and low alarms individually
programmable as unsigned values for flow
rate, energy flow rate, feed temperature,
return temperature or temperature
difference.
Meter-Bus
Type: Conforms to CEN/TC176 Meter-bus standard.
Protocol: IEC 870-5.
RS485
Data Transmitted: All data calculated can be transmitted.
Baud Rate: 300 to 9600 baud.
Parity: Odd, even or none.
Stop Bits: One or two.
Bus Address: Programmable for multiple instruments
on the same bus.
Protocol: Modbus RTU.
Important: Specifications are subject to change without notice.
Specifications
152mm
(6.0")
96mm
(3.9")
141mm
(5.6")
REAR VIEW SIDE VIEW
87mm
(3.5")
16mm
(0.6")
96mm
(3.9")
Dimension Drawings
c
Distributed by:
Terminal Descriptions
D
Ordering Information
When specifying please indicate model(s) required using the following method.
4 Dart Road
Newnan, Georgia
Tel: 1-770-254-0400
Fax: 1-770-251-6427
www.yokogawa-ia.com
BU 1P11A2-E-U
REV 1, JULY 1998

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Heat Calculator for Chilled and Hot Water Systems

  • 1. A C C U R A C Y • Q U A L I T Y • P E R F O R M A N C E Heat Calculator Model 212 Features I Multilingual capability I Heating, cooling and air condi- tioning I Built-in density and enthalpy tables I Meter-bus interface and RS485 communications I Metric or US units I 4-wire Pt100 RTD temperature inputs I Fully programmable I Calculates and displays Volume, Energy, Temperatures and Peak Energy I Watertight to IP66 (Nema 4X) I High accuracy Overview The 212 Heat Calculator is designed to measure the energy consumed in hot water heating systems and chilled water cooling systems. The 212 will interface with a wide range of flowmeters, including vortex and magnetic flowmeters with pulse outputs, positive displacement and inferential water meters, turbine and paddle wheel flowmeters. Provides flexibility to meet all applications The 212 is able to cross international boundaries in heat meter applications. Multilingual capability, data logging and peak/off-peak operation are standard. In addition, four modes of operation cover- ing heating and cooling ensure that the 212 is flexible enough to meet all energy measurement applications. The high accuracy of the 212 ensures that it meets European and International approvals for heat calculators. Accuracy to OIML R75 Class 4 and EN1434 The 212 has in-built correction for the non-linearity of the RTDs. For chilled water measurement where the tempera- ture difference (∆t) is likely to be small, provision is made in the set-up program to zero out any offset between RTDs. The 212 is fully programmable and all set-up data and totals are stored in a non-volatile memory for a minimum of 10 years.
  • 2. Watertight wall or panel mount enclosure The 212 Heat Calculator is housed in a rugged yet attractive IP66 (Nema 4X) rated polycarbonate enclosure which is completely watertight. Mounting is either by a wall bracket or by panel mount. Integration with energy manage- ment systems A Meter-bus interface enables the 212 Heat Calculator to be incorporated into energy management systems complying with European IEC 870-5 protocol stan- dards. The 212 is also supplied with an RS485 bus, which uses industry standard Modbus RTU protocol, for interfacing to computers and DCS systems. Datalogging flexibility The 212 Heat Calculator will store ener- gy totals by hour, day, week or month for up to 31 periods. The totals are stored for each period and can be downloaded to a computer via the Meter-bus or RS485 communications ports. Peak and off-peak registers If selected, the peak/off-peak feature will assign two separate registers which will totalize peak energy and off-peak energy. The changeover times between peak and off-peak are fully programmable. Modes of Operation The 212 Heat Calculator is flexible enough to handle a wide range of appli- cations. Four operating modes are avail- able. I Heating Mode where positive ∆t's only are totalized. I Cooling Mode where negative ∆t's only are totalized. I Heating/Cooling Mode where the flow of energy may be for heating or cooling. In this mode the energy total is increased regardless of whether ∆t is positive or negative. I Charge/Discharge Mode where two separate registers totalize positive and negative totals. Calculates the density and enthalpy of water The 212 Heat Meter measures the tem- perature in the feed and return lines and, from this, calculates the density and enthalpy of the water. By also measuring the volume of water flowing in the system, the 212 will then compute the energy consumed. Power is calculated as: P = V x pp x (hTV - hTR) where P = Power (W) V = Volumetric flow rate (m3 /s) pp = Density (kg/m3 ) hTV = Specific enthalpy (J/kg) at Feed temperature hTR = Specific enthalpy(J/kg) at Return temperature The volume, energy, temperatures and peak energy are all calculated and can be displayed on the large LCD. Heat Calculator Model 212 A C C U R A C Y • Q U A L I T Y • P E R F O R M A N C E
  • 3. General Display Type: 7 digit LCD - 7 numeric digits and 11 alpha characters. Digits: 15.5mm (0.6”) high. Characters: 6mm (0.24”) high. Display Units: kWh, MWh, MJ, GJ, therm, BTU x 1000, tons x hours (refrigeration). Maximum Thermal Power 3000MW Measurement Time 0.3s. Accuracy OIML R75 Class 4 and EN 1434. Power Requirements DC Power: 12 to 24V DC @ 100mA maximum. Physical Temperature Operating: 5 to 55°C. Storage: -20 to 70ºC. Environmental Class EN1434 Classes A & C. Enclosure Protection: IP66 (Nema 4X) watertight. Materials: Polycarbonate and ABS. Mounting Options Wall: Wall mount bracket. Panel: Mounting clips. Inputs Flowmeter Type: Frequency or pulse between 0.01Hz to 20KHz. Default low frequency cutoff is 0.25Hz. K-factor Range: Programmable in the range 0.001 to 999,999.9 pulses per litre, m 3 , US gallon or ft3 . Signal Type: Pulse, open collector, reed switch, proximi- ty switch or coil. Location: In either the return or feed lines. Temperature Type: 4-wire Pt100 RTDs to IEC 751. 1 /10 DIN. Location: 1 x Feed Line and 1 x Return Line. Linearisation: Built-in RTD linearisation. Temp. Range: -10 to 220°C (1 to 200°C approved). Temp. Difference: 1 to 200K (2 to 199K approved). Measurement Time: 15s Cable Length: <50m. Connection: G1/2B. Outputs Pulse Type: Open collector will sink up to 100mA, 30V DC maximum. Width: 10ms. Function: Volume or Energy (scaled). Frequency: 1 pulse every preset number of units of energy or volume total. Alarm Type: Two solid state opto-isolated relays which will sink up to 100mA, 30V DC maximum. Function: High and low alarms individually programmable as unsigned values for flow rate, energy flow rate, feed temperature, return temperature or temperature difference. Meter-Bus Type: Conforms to CEN/TC176 Meter-bus standard. Protocol: IEC 870-5. RS485 Data Transmitted: All data calculated can be transmitted. Baud Rate: 300 to 9600 baud. Parity: Odd, even or none. Stop Bits: One or two. Bus Address: Programmable for multiple instruments on the same bus. Protocol: Modbus RTU. Important: Specifications are subject to change without notice. Specifications 152mm (6.0") 96mm (3.9") 141mm (5.6") REAR VIEW SIDE VIEW 87mm (3.5") 16mm (0.6") 96mm (3.9") Dimension Drawings c
  • 4. Distributed by: Terminal Descriptions D Ordering Information When specifying please indicate model(s) required using the following method. 4 Dart Road Newnan, Georgia Tel: 1-770-254-0400 Fax: 1-770-251-6427 www.yokogawa-ia.com BU 1P11A2-E-U REV 1, JULY 1998