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212 Heat Calculator
Brand: Yokogawa Electric CorporationThe 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 and 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.
Features- Multilingual capability
- Heating, cooling and air conditioning
- Built-in density and enthalpy tables
- Meter-bus interface and RS485 communications
- Metric or US units
- 4-wire Pt100 RTD temperature inputs
- Fully programmable
- Calculates and displays Volume, Energy, Temperatures and Peak Energy
- Watertight to IP66 (Nema 4X)
- High accuracy
Specifications
Accuracy
- OIML R75 Class 4 & EN 1434
Alarm
- 2 Solid State Opto-Isolated Relays Which Will Sink up to 250 mA, 30 Vdc, Max.
Approvals & Certifications
- CE
- IEC 870-5
BSP Connection
- G 1/2” B
Cable Length
- < 164 feet (< 50 metres) - RTD Cable
Communication
- Baud Rate: 300 to 9,600
- M-Bus: Conforms to CEN/TC176 & IEC 870-5 Protocol
- Modbus RTU Protocol
- RS-485
- Stop Bit: 1-bit, 2-bits
Display
- 0.24” (6 mm) High - Characters
- 0.6” (15.5 mm) High - Digits
- 7-Digits LCD - 7 Numeric Digits & 11 Alpha Characters
Enclosure, Body Material
- ABS
- Polycarbonate
Environmental Protection
- IP66
- NEMA 4X
Frequency
- 0.01 Hz to 20 kHz - Flowmeter
- 0.25 Hz - Default Low Cut-Off Frequency
Function
- Energy (Scaled) - Pulse
- Energy Flow Rate - Alarm
- High & Low Alarms
- Return Temperature, Temperature Difference, Feed Temperature - Alarm
- Volume - Pulse
Input Signal
- Open Collector
- Proximity Switch or Coil
- Pulse
- Reed Switch
K-Factor
- Programmable from 0.001 to 999,999.9 Pulse Per Litre, m³, US Gallon or Ft³
Maximum Voltage
- 30 Vdc
Measuring Time
- 0.3 seconds - Display
- 15 seconds - Temperature
Mounting
- Panel Mount
- Wall Mounted
Operating Temperature
- 5° to 55° C (41° to 131° F)
Output
- Open Collector Will Sink up to 100 mA
Pipe Size
- 3” to 8” (85 to 210 mm) - Temperature Sensor
Power
- 12 Vdc
- 3,000 mW - Max.
Power Requirement
- 12-24 Vdc at 100 mA - Max.
Pulse Range
- 10 milliseconds
RTD Type
- 4-Wire Pt100 RTDs to IEC 751, 1/10 DIN
Storage Temperature
- -20° to 70° C (-4° to 158° F)
Temperature Range
- -10° to 220° C (14° to 428° F)
