Contrec 212 Heat Calculator (BTU Energy Meter for Chiller/HVAC)

Contrec 212 Heat Calculator (BTU Energy Meter for Chiller/HVAC)

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Billing tenants for chilled water usage? The Contrec 212 is the industry standard BTU Energy Meter that calculates thermal energy from flow and temperature inputs. MID approved for custody transfer.

The Contrec 212 BTU Meter is a reliable and versatile device designed to measure energy consumption in both heating and cooling systems with exceptional accuracy. This advanced BTU meter can interface with a wide range of flowmeters, making it a flexible solution for diverse applications.

Key Features of the Contrec 212 BTU Meter

  • Versatile Flowmeter Compatibility: The Contrec 212 BTU Meter can connect with various flowmeters, including positive displacement and inferential water meters, magnetic flowmeters with pulse outputs, turbine flowmeters, and paddlewheel flowmeters. This wide compatibility ensures seamless integration into existing systems.

  • High-Accuracy Temperature Measurement: Equipped with two PT100 resistance temperature devices (RTDs), the Contrec 212 accurately measures temperatures in both supply and return flow lines. For optimal precision, the RTDs should be a matched pair, Class A to IEC 751 standards.

  • Comprehensive Energy Calculation: By measuring the volume of water and its temperature difference, the Contrec 212 calculates the energy consumed in the system. This makes it ideal for typical water heating or cooling systems operating at pressures up to 16 bars.

  • Standards Compliance: The Contrec 212 BTU Meter complies with OIML R75 and EN1434 standards, ensuring high reliability and accuracy in energy measurement.

  • Communication and Connectivity: Featuring Meter-bus and RS485 (Modbus RTU) communication links, the Contrec 212 BTU Meter allows easy integration into building management systems and other monitoring networks.

  • Peak and Off-Peak Registers: The device includes separate registers for peak and off-peak periods, enabling precise energy tracking and cost allocation in systems with varying usage patterns.

  • Pulse Output Functionality: The Contrec 212 provides a programmable pulse output with pulse widths ranging from 10 to 500ms, allowing for flexible data reporting and integration.

  • Real-Time Clock: With a highly accurate built-in real-time clock (2ppm type), the Contrec 212 maintains accurate timekeeping for logging and peak/off-peak tracking. The clock can continue running for two days after a power failure, maintaining ±1 minute accuracy.

Applications of the Contrec 212 BTU Meter

The Contrec 212 BTU Meter is suitable for various applications, including:

  • Commercial and Residential Buildings: Track energy consumption for heating and cooling systems to improve efficiency and reduce costs.

  • Industrial Processes: Monitor and manage energy usage in large-scale heating and cooling applications to optimize performance.

  • Energy Management Systems: Integrate with building management systems to provide detailed energy usage data for better decision-making.

Why Choose the Contrec 212 BTU Meter?

The Contrec 212 BTU Meter stands out for its accuracy, flexibility, and compliance with international standards. It is a preferred choice for professionals seeking a dependable solution for monitoring energy consumption in heating and cooling systems. With optional temperature probes, power supply options, and comprehensive communication capabilities, the Contrec 212 offers unmatched versatility and performance.

Conclusion

In summary, the Contrec 212 BTU Meter is an essential tool for accurately measuring energy consumption in heating and cooling systems. Its advanced features, compliance with global standards, and compatibility with various flowmeters make it a reliable and versatile choice for a wide range of applications. Enhance your energy management capabilities with the precision and reliability of the Contrec 212 BTU Meter.

Contrec Model 212 Heat Calculator Technical Specifications
● GENERAL
DescriptionThe 212 Heat Calculator is designed to measure the energy consumed in hot water heating systems and chilled water cooling systems. It is a high-accuracy heat calculator designed to operate with digital output flowmeters, housed in an IP67 weatherproof case with a tactile keyboard and various mounting options. The unit can be supplied complete with temperature probes and interfaces with a wide range of flowmeters, including positive displacement and inferential water meters, magnetic flowmeters with pulse outputs, and turbine and paddle wheel flowmeters.
Key FeaturesHigh accuracy; 4-20mA output option; 4-wire PT100 RTD temperature inputs; heating, cooling and air conditioning; calculates and displays volume, energy, temperature and peak energy; built-in density and enthalpy tables; Meter-bus interface and RS485 communications; fully programmable; multilingual capability; metric or US units; watertight to IP66 (NEMA 4X); complies with OIML R75 and EN1434 standards; CE compliant.

 

● MODES OF OPERATION
Heating ModePositive ∆t’s only are totalised.
Cooling ModeNegative ∆t’s only are totalised.
Heating/Cooling ModeThe flow of energy may be for heating or cooling; the energy total is increased regardless of whether ∆t is positive or negative.
Charge/Discharge ModeTwo separate registers totalise positive and negative totals.

 

● FUNCTIONAL DESCRIPTION
Density & Enthalpy CalculationThe 212 measures temperature 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 computes the energy consumed. Power is calculated as: P = V x ρ x (hTV − hTR), where P = Power (W), V = Volumetric flow rate (m³/s), ρ = Density (kg/m³), hTV = Specific enthalpy (J/kg) at feed temperature, hTR = Specific enthalpy (J/kg) at return temperature.
Integration with Energy Management SystemsA Meter-bus interface enables the 212 to be incorporated into energy management systems complying with European IEC 870-5 protocol standards. Also supplied with an RS485 bus using industry-standard Modbus RTU protocol for interfacing to computers and DCS systems.
DataloggingStores energy totals by hour, day, week or month for up to 31 periods. Totals for each period can be downloaded to a computer via the Meter-bus or RS485 communications ports. All set-up data and totals are stored in non-volatile memory for a minimum of 10 years.
Peak and Off-Peak RegistersIf selected, assigns two separate registers which totalise peak energy and off-peak energy. Changeover times between peak and off-peak are fully programmable.
Chilled Water / RTD HandlingCan be supplied with two precision 4-wire PT100 RTDs and has inbuilt correction for RTD non-linearity. For chilled water measurement, where ∆t is likely to be small, the set-up program allows zeroing out of any offset between RTDs.
4-20mA OutputOptional and can be programmed to output flow rate, energy flow rate, feed or return temperature, or ∆t. Note: high and low alarms are not available if the 4-20mA option is installed.
EnclosureHoused in a rugged yet attractive IP66 (NEMA 4X) rated polycarbonate enclosure which is completely watertight. Mounting is either by wall bracket or panel mount. Volume, energy, temperatures and peak energy are all calculated and can be displayed on the large LCD.

 

● DISPLAY
Type7-digit LCD — 7 numeric digits and 11 alpha characters.
Digits / CharactersDigits: 15.5mm (0.6″) high. Characters: 6mm (0.24″) high.
Display UnitskWh, MWh, MJ, GJ, therm, BTU x 1000, tons x hours (refrigeration).
Maximum Thermal Power3000 MW.
Measurement Time0.5s.
AccuracyOIML R75 Class 4 and EN1434.
ApprovalsApproved by Swiss Federal Office of Metrology to OIML Class 4.
InterferenceCE Compliance.

 

● INPUTS — FLOWMETER PULSE
TypeFrequency or pulse between 0.01Hz to 20KHz. Default low frequency cutoff is 0.25Hz.
K-factor RangeProgrammable in the range 0.001 to 999,999.9 pulses per litre, m³, US gallon or ft³.
Signal TypePulse, open collector, reed switch, proximity switch or coil.
LocationIn either the return or feed lines.

 

● INPUTS — TEMPERATURE
Type4-wire PT100 RTD’s to IEC 751, 1/10 DIN.
Location1 x Feed Line and 1 x Return Line.
LinearisationBuilt-in RTD linearisation.
Temp. Range−10 to +220°C (1 to 200°C approved).
Temp. Difference1 to 200K (3 to 199K approved).
Measurement Time3s.

 

● POWER REQUIREMENTS
DC Power12 to 24Vdc @ 100mA maximum.
AC PowerSupplied via power adaptor.

 

● OUTPUTS — PULSE
TypeOpen collector, will sink up to 100mA, 30Vdc maximum.
Width10ms.
FunctionVolume or Energy (scaled).
Frequency1 pulse every preset number of units of energy or volume total.

 

● OUTPUTS — ALARM (Not available with 4-20mA output)
TypeTwo solid state opto-isolated relays which will sink up to 100mA, 30Vdc maximum.
FunctionHigh and low alarms individually programmable as unsigned values for flow rate, energy flow rate, feed temperature, return temperature or temperature difference.

 

● OUTPUTS — 4-20mA OUTPUT OPTION
FunctionVolumetric flow rate, energy flow rate, feed or return temperature, ∆t.
Accuracy0.1%.
Cable Length< 50m.
SpanProgrammable.
LoadMaximum of 300 ohms at 12V.

 

● COMMUNICATIONS — METER-BUS
TypeConforms to CEN/TC176 Meter-bus standard.
ProtocolIEC 870-5.

 

● COMMUNICATIONS — RS485
Data TransmittedAll calculated data can be transmitted.
Baud Rate300 to 9600 baud.
ParityOdd, even or none.
Stop BitsOne or two.
Bus AddressProgrammable for multiple instruments on the same bus.
ProtocolModbus RTU.

 

● ENVIRONMENTAL / TEMPERATURE
Operating Temperature5 to 55°C.
Storage Temperature−20 to +70°C.
Environmental ClassEN1434 Classes A & C.

 

● ENCLOSURE & MOUNTING
ProtectionIP66 (NEMA 4X) watertight.
MaterialsPolycarbonate and ABS.
Mounting — WallWall mount bracket.
Mounting — PanelMounting clips.

 

● DIMENSIONS
Enclosure151mm (5.9″) W x 98mm (3.9″) H.
Panel Mount Bracket (Option 1)41mm (1.6″); 87mm (3.4″); 43mm (1.7″). Cutout size: 87mm (3.4″) H x 141mm (5.6″) W.
RTD Typical ConfigurationProbe diameter < 7mm Ø; insertion length 85, 120 or 210mm; G1/2B process connection; signal cable inlet < 9mm Ø.

 

● TERMINAL DESCRIPTIONS
RTD Connections1 = High temp RTD Current (+); 2 = High temp RTD Current (−); 3 = Low temp RTD Current (+); 4 = Low temp RTD Current (−); 5 = High temp RTD Input (+); 6 = High temp RTD Input (−); 7 = Low temp RTD Input (+); 8 = Low temp RTD Input (−).
Flowmeter Signals9 = Namur Switch (+); 10 = Flow Signal Input; 11 = Coil Reference; 12 = Flow Signal Common.
Pulse Output16 = Pulse Output (+); 17 = Pulse Output (−).
Communications24 = Meter-Bus; 25 = Meter-Bus; 56 = RS485 (+); 57 = RS485 (−).
Alarm Relays (DC voltage only)52 = Relay 0 (+); 53 = Relay 0 (−); 54 = Relay 1 (+); 55 = Relay 1 (−); 58 = Shields.
4-20mA Output52 = 4-20mA (+); 53 = 4-20mA (−).
Power Supply50 = 12 to 24Vdc Supply (+); 51 = 12 to 24Vdc Supply (−).

 

● PRODUCT CODES / ORDERING — 212.[Enclosure Mounting][Output Options][Power Options][Temperature Sensors][Approvals]
CategoryCodeOptionNotes
Enclosure Mounting0Wall Mounting (no gland holes) 
1Panel Mounting **Cable glands not included
2Wall Mounting (standard gland holes) 
Output Options0No Option 
14-20mA 
Power OptionsNDC Powered 
EEuropean Adapter (220Vac) 
UUK Adaptor (220Vac) 
AUSA Adaptor (100Vac) 
HAustralian Adaptor 
Temperature Sensors0No Probe 
885mm Insertion 
1120mm Insertion 
2210mm Insertion 
ApprovalsSOIML R75 Compliant 
(blank)No ApprovalsLeave blank if not compliance-required
Typical Part Number: 212.20E1S. Specifications are subject to change without notice.

Download Contrec 212 Heat Calculator (BTU Energy Meter for Chiller/HVAC) information here

Datasheet: Contrec_212_Heat_Calculator 
Manual: Contrec-212-M-V2.3

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