Yokogawa 212 User Manual
HEAT CALCULATOR
MODEL 212
July 1998
CONTENTS
1. Overview 3
1.1 Model Number Designation 5
1.2 Conversion Factors 6
2. Specification 7
3. Operation 11
3.1 Display Operation 13
3.1.1 Normal Operation 13
3.1.2 Charge/Discharge Operation 17
3.1.3 Peak and Off-Peak Operation 18
3.2 Checking Set-up Parameters 19
3.3 Units of Measurement 24
3.4 Frequency Cut-off 25
3.5 Offset Functions 26
3.6 Operating Modes 27
3.6.1 Heating 27
3.6.2 Cooling 27
3.6.3 Heating/Cooling 27
3.6.4 Charge/Discharge 28
3.7 Peak and Off-Peak 29
3.8 Logging 30
4. Communications 31
4.1 Meter-bus 32
4.2 Infra-red Communications Link 34
4.3 RS485 with Modbus RTU Protocol 35
4.3.1 Hardware 35
4.3.2 Protocol 35
4.3.3 Bus Address 36
4.3.4 Function Codes 37
4.3.5 Exception Response 37
4.3.6 List of Data Registers 38
5. Set-up Mode 44
6. Input & Output Connections 50
6.1 Flowmeter Input 50
6.2 RTD Input 53
6.3 Power Supply 54
6.4 Pulse Output 55
6.5 Alarm Relay Outputs 57
6.6 4-20mA Output Option 59
7. Installation 61
7.1 Wall Mounting 61
7.2 Panel Mount Version 63
7.3 Removing the Front Panel 64
7.4 Verification Seal 66
7.5 Wiring Practices 67
7.6 Terminal Designations 69
Index 70
)
Overview 3
1. OVERVIEW
The Model 212 Heat Calculator is designed to measure the energy consumed in
both heating and cooling (air conditioning) systems. The instrument is normally
supplied complete with temperature probes and power supply, and will interface
to a wide variety of flowmeters, including positive displacement and inferential
water meters, magnetic flowmeters with pulse outputs, turbine flowmeters &
paddlewheel flowmeters.
The Model 212 measures the temperature in the feed and return flow lines and
uses this information to calculate the density and enthalpy of water. By also
measuring the volume of water flowing in the system, the Model 212 will then
determine the energy used. Power is calculated as:
P=Vxρ x(h
TV-hTR
where P = Power (W)
3
V = Volumetric Flow rate (m
!
= density (kg/m
= Specific Enthalpy (J/kg) at Feed Temperature
h
TV
= Specific Enthalpy (J/kg) at Return Temperature
h
TR
3
)
/sec)
The Model 212 is designed to be used in typical water heating or cooling systems
where pressures do not exceed 16 bars.
The temperature in both the feed and return lines is measured via two PT100
resistance temperature devices (RTDs). For maximum accuracy, four wire RTD
measurement is used and internally corrected for non-linearities which are
inherent to an RTD.
The Model 212 complies with OIML R75 and EN1434 standards and includes
Meter-bus and an infra-red data transfer option.
The Model 212 includes separate peak and off-peak registers as well as the ability
to compute charge and discharge energy in systems where heat may be stored in
underground tanks. The Model 212 also includes an RS485 communications link
with Modbus RTU protocol.
4 Overview
The Model 212 has a highly accurate built-in real time clock (2ppm typ) to keep
track of logging, peak-on/peak-off points, etc. In case of a power failure, the
real-time clock is able to keep running for two days with a ± 1 minute accuracy,
typically.
This instrument conforms to the EMC-Directive of the Council of European
Communities 89/336/EEC and the following standards:
Generic Emission Standard EN 50081-1 Residential, Commercial & Light
Industry Environment.
Generic Emission Standard EN 50081-2 Industrial Environment.
Generic Immunity Standard EN 50082-1 Residential, Commercial & Light
Industry Environment.
Generic Immunity Standard EN 50082-2 Industrial Environment.
In order to comply with these standards, the wiring instructions in Section 7.5
must be followed.
1.1 MODEL NUMBER DESIGNATION
Model 212 . 2 0 E 8 S
Mounting
Panel Mount 1
Wall Mount 2
Options
No Options 0
4-20mA Output 1
Power
12VDC Power N
European Adapter
(220 VAC) E
UK Adapter
(220 VAC) U
USA Adapter
(110 VAC) A
Australian Adapter
(240 VAC) H
Overview 5
Temperature Sensor
None 0
85mm pipe 8
120mm pipe 1
210mm pipe 2
Compliance
EN1434 S
6 Overview
1.2 CONVERSION FACTORS
1 kWh = 3.600 MJ
1 MJ = 0.27778 kWh
3
1 m
1 US gal = 3.785 litres
3
1 ft
1 kBTU = 1.0551 MJ
1 Ton x Hour (Refrigeration) = 12,000 BTU
1 therm = 100,000 BTU
Note: kBTU are used on the Model 212 display and mean BTU x 1000.
= 1000 litres
= 7.4805 US gal
Specification 7
2. SPECIFICATION
General
Energy Display units: kWh, MWh, MJ, GJ, therm, BTU x 1000,
tons x hours (refrigeration).
Maximum Thermal
Power: 3000 MW.
Accuracy Class: OIML R75 Class 4,
EN1434.
Measurement Time: 0.5 sec time interval.
Environmental Class: EN1434 Classes A & C.
Ambient Temp Range: 0°C to 60°C.
Storage Temp Range: -20°C to 70°C.
Temperature Measurement
Type of Sensor: Pt100 to IEC751.
Temperature Range: -10°C to 220°C
Temperature Difference: 1K to 200K.
Approved Temp Range: 1°C to 200°C.
Approved Temp Difference: 3K to 199K.
Measurement Time: 3 sec time interval.
Display
Type: LCD with 7 digit numeric display and 11
character display.
Digits: 15.5mm (0.6") high.
Characters: 6mm (0.24") high.
8 Specification
Flowmeter Input
Type: Frequency or Pulse between 0.01Hz to 20kHz.
Default low frequency cut-off is 0.25Hz.
Signal Type: Pulse, open collector, reed switch, proximity
switch or coil.
K-factor range: Programmable between 0.001 to 999,999.9 pulse
3
per litre, m
, US gallon or ft3.
Location: In either the feed or return lines.
Temperature Sensor (RTD) Input
Sensor Type: Pt100 to IEC 751.
Connection Type: Four wire.
Location: Two RTD inputs, one for the feed and a second
for the return lines.
Linearisation: Built in RTD linearisation.
Temperature Range: -10°C to 220°C.
RTD Cable Length: < 50m.
Pulse Out
Pulse Width: 10ms.
Type: Open collector will sink up to 100mA.
30Vdc Maximum.
Function: Volume or Energy (scaled).
Frequency: 1 pulse every preset number of units of energy or
volume total.
Power Requirements
dc Power: 12 to 24V dc @ 100mA maximum.
ac Power: Supplied via a power adapter.
Specification 9
Construction
Enclosure Material: ABS/Polycarbonate.
Colour: Light beige.
Protection: Sealed to IP67 (Nema 4X).
Mounting: Wall mounting or panel mounting.
Dimensions: 152mm (6.0") wide x 98mm (3.9") high x 43mm
(1.7") deep.
Alarm Output (not available if 4-20mA Output Option is installed)
Type: Two solid state opto-isolated relays which will
sink up to 250mA. 30V dc maximum.
Function: High and low alarms individually programmable
as unsigned values, for volumetric flow rate,
energy flow rate, feed temperature, return
temperature or temperature difference.
4-20mA Output Option
Function: Volumetric flowrate, energy flowrate, feed
temperature, return temperature or temperature
difference.
Output Range: 2.0mA to 22.0mA.
Linearity: 0.02% of span.
Accuracy: 0.1% of span.
Response Time: 0.5 seconds to 99%.
Maximum Output: Vdc -6V.
10 Specification
RS485 Option
Data Transmitted: Volume and energy totals, peak power,
temperatures.
Baud rate: 300 - 9600 baud.
Parity: Odd, even or none.
Stop bits: One or two stop bits.
Bus Address: Programmable for multiple instruments on the
same bus.
Protocol: Modbus RTU.
Meter-Bus
Type: Conforms to CEN/TC176 Meter-bus standard.
Protocol: IEC 870-5.
3. OPERATION
The Model 212 has three display modes:
1. Display of normal energy and flow information.
This information is available by pressing the DISPLAY key. Where
appropriate Accumulated Totals can be displayed by pressing the
ACCUM TOTAL key.
2. Checking Set-up Parameters.
By pressing and holding the DISPLAY key for about 5 seconds, the
instrument will enter the parameter set-up routine and allow all set-up
parameters to be checked but not changed. The DISPLAY key is used
to step through the parameter list.
3. Set-up Parameters.
By removing the bottom cover strip of the instrument (see Section 7),
the set-up switch becomes visible. Pressing this switch will put the
instrument into the set-up mode, whereby all parameters can be
programmed using the DISPLAY, and switches.
Operation 11
The LCD display has 7 numeric digits with 11 alphanumeric characters along the
bottom. The alphanumeric characters are used to display the parameter and
units.
12 Operation
Three key switches provide the following functions:
Displays the accumulated (non-resettable) totals
for Energy, Volume, operating time (elapsed time)
and Energy total for log entries.
Also changes digits, decimal point or units when
entering the set-up parameters. A flashing digit,
decimal point or unit will indicate that the
parameter can be changed.
If the Reset function is enabled during set-up, the
RESET key, when held for 5 seconds, will reset
all totals and the operating time.
Also increments the digit, changes decimal point
position, steps through units when entering set-up
parameters and steps through individual log
entries.
Used to change the display to the next parameter.
Also steps through display modes when held for 5
seconds.
Operation 13
3.1 DISPLAY OPERATION
3.1.1 Normal Operation
Data which can be displayed by pressing the DISPLAY key is as follows:
Default display - Energy measured
since the last reset.
(1(5*< .:K
Press DISPLAY Press ACCUM TOTAL
⇓⇓
Accumulated Energy
Total (non-resettable).
$&&80 .:K
7(67
Press DISPLAY
⇓
92/80( 0
Press DISPLAY Press ACCUM TOTAL
⇓⇓
Display segments test. Segments are
flashing.
Volume of water measured through
the system since the last reset.
Accumulated Volume
Total (non-resettable).
$&&80 0
14 Operation
32:(5 .:
Press DISPLAY
⇓
Energy flow rate
)/2: 0+
Press DISPLAY
⇓
)((' &
Press DISPLAY
⇓
5(7851 &
Press DISPLAY
⇓
Volume flow rate
Temperature in the feed line.
Temperature in the return line.
Difference in temperature between
the feed and return lines.
Press DISPLAY
⇓
3($. 3 .:
Peak power averaged over a 15
minute period.
Press DISPLAY
⇓
Operating time elapsed since the last
reset.
23 70 +50,1
Press DISPLAY Press ACCUM TOTAL
⇓⇓
Operation 15
$&&80 +50,1
6833/<
Press DISPLAY
⇓
&/2&. +0,1
Press DISPLAY
⇓
'$7(
Press DISPLAY*
⇓
Accumulated operating
time (non-resettable).
Number of times the power has failed
or has been switched off to the unit
since the last reset.
Time of day (24 hour clock).
Date - Day - Month (SI Units)
Month - Day (US Units)
70 /2*
Time and date of the last logged
entry. Pressing the RESET key will
display the previous logged entries.
16 Operation
Press ACCUM TOTAL
⇓
Energy Total of selected
log entry.
(1 /2* .:+
* If logging is not used, pressing the DISPLAY key will return to the Energy
display.
Operation 17
3.1.2 Charge/Discharge Operation
If Charge/Discharge operation is programmed, the following display formats will
be apparent in place of the normal ENERGY display:
(1 &+5 .:K
Press DISPLAY Press ACCUM TOTAL
⇓⇓
$&&80 .:K
Charge Energy default display Charge Energy measured since the
last reset.
Accumulated Charge
Energy Total
(non-resettable).
Discharge Energy measured since the
last reset.
(1 ',6 .:+
Press DISPLAY Press ACCUM TOTAL
⇓⇓
Accumulated Discharge
Energy (non-resettable).
$&&80 .:+
Press DISPLAY Press ACCUM TOTAL
⇓⇓
Display segments test. Segments are
7(67
⇓
Press DISPLAY
For continuation of displays refer to Section 3.1.1 Normal Operation.
flashing.
18 Operation
3.1.3 Peak and Off-Peak Operation
If Peak and Off-Peak operation is programmed, the following display formats will
be apparent in place of the normal ENERGY display:
(1 3. .:K
Press DISPLAY Press ACCUM TOTAL
⇓⇓
$&&80 .:K
Peak Energy default display - Peak
Energy measured since the last reset.
Accumulated Peak
Energy Total
(non-resettable).
Off-Peak Energy measured since the
last reset.
(1 23.
Press DISPLAY Press ACCUM TOTAL
⇓⇓
Accumulated Off-Peak
Energy (non-resettable).
$&&80 .:+
Display segments test. Segments are
flashing.
7(67
⇓
Press DISPLAY
For continuation of displays refer to Section 3.1.1 Normal Operation.
Operation 19
3.2 CHECKING SET-UP PARAMETERS
By pressing the DISPLAY key for 5 seconds, the program will enter the Check
Set-up Parameters mode. Various set-up parameters can be checked, but not
changed, by using the DISPLAY key.
Set-up Mode may be exited by either moving to the last set-up item, QUIT, and
selecting YES, or the DISPLAY key may be pressed and held for 5 seconds.
After this time, the Model 212 will return to normal operation.
The readout will display the following:
Parameter Value Description
1. LANG ENGL
GERM
Current language.
2. MODE HEAT
COOL
HT/CL
CHAR
3. UNITS SI
US
4. FACTOR xxx.x p/ltr The K-factor of the flowmeter which has
5. CUTOFF x.xx Hz Low frequency cut-off of the flowmeter
Current mode of operation.
Metric units.
US units.
been programmed.
expressed in Hz. The Model 212 will not
register flow if the input frequency is
below this value. (Default is 0.25Hz).
See Section 3.4.
20 Operation
Parameter Value Description
6. OFFSET x.x
YES
The offset between temperature sensors
(see Section 3.5).
0.0
NO
7. FM LOC Feed
Ret
If High and Low alarms are installed
8. REL0 Flw H
Flw L
Pwr H
Pwr L
∆t° H
∆t° L
Ft° H
Ft° L
Rt° H
Rt° L
9. REL0 xxxx.xxx Set point for parameters set in step 8
The offset function is disabled.
Location of the flowmeter in either the
feed or return line.
Defines the parameter for Relay 0 output
as being high or low alarm for flow,
power, temperature difference, feed or
return temperatures.
above. For low alarms the relay will
close if the parameter is below the set
point. For high alarms it will close if the
parameter is above the set point.
10 REL1 ... Defines the parameter for Relay 1 as in
step 8 above.
11. REL1 xxxx.xxx Set point for parameter for Relay 1 as in
step 9 above.
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