Contrec 212 User Manual
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Contrec 212 User Manual

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HEAT CALCULATOR
MODEL 212
212-M-V2.1
June 2017

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  • Page 1 HEAT CALCULATOR MODEL 212 212-M-V2.1 June 2017...
  • Page 2 212-M-V2.1...

  • Page 3: Table Of Contents

    3.6.4 Charge/Discharge 3.7 Peak and Off-Peak 3.8 Logging 4. Communications 4.1 Meter-bus 4.2 Infra-red Communications Link 4.3 RS485 with Modbus RTU Protocol 4.3.1 Hardware 4.3.2 Protocol 4.3.3 Bus Address 4.3.4 Function Codes 4.3.5 Exception Response 4.3.6 List of Data Registers 212-M-V2.1...
  • Page 4 6.2 RTD Input 6.3 Power Supply 6.4 Pulse Output 6.5 Alarm Relay Outputs 6.6 4-20mA Output Option 7. Installation 7.1 Wall Mounting 7.2 Panel Mount Version 7.3 Removing the Front Panel 7.4 Verification Seal 7.5 Wiring Practices 7.6 Terminal Designations Index 212-M-V2.1...

  • Page 5: Overview

    & 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.
  • Page 6 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.

  • Page 7: Model Number Designation

    Overview 1.1 MODEL NUMBER DESIGNATION Model 212 . 2 0 E 8 S Mounting Panel Mount Wall Mount Options No Options 4-20mA Output Power 12VDC Power European Adaptor (220 VAC) UK Adaptor (220 VAC) USA Adaptor (110 VAC) Australian Adaptor...

  • Page 8: Conversion Factors

    1 ft 3 7.4805 US gal 1 kBTU 1.0551 MJ 1 Ton x Hour (Refrigeration) = 12,000 BTU 1 therm 100,000 BTU 1 Calorie 4.1868 Joule Note: kBTU are used on the Model 212 display and mean BTU x 1000. 212-M-V2.1...

  • Page 9: Specification

    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. 212-M-V2.1...
  • Page 10 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. 212-M-V2.1...
  • Page 11 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. 212-M-V2.1...
  • Page 12 300 - 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. 212-M-V2.1...

  • Page 13: Operation

    Operation 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.
  • Page 14 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 DISPLAY 5 seconds. 212-M-V2.1...

  • Page 15: Display Operation

    TEST 00.0.0.0. Press DISPLAY 1 4 3 4 . 6 Volume of water measured through the system since the last reset. VOLUME Press DISPLAY Press ACCUM TOTAL 6 4 3 2 6 . 5 Accumulated Volume Total (non-resettable). ACCUM 212-M-V2.1...
  • Page 16 Temperature in the return line. RETURN °c Press DISPLAY 8 . 3 Difference in temperature between the feed and return lines. < T Press DISPLAY 1 1 . 6 Peak power averaged over a 15 minute period. PEAK P 212-M-V2.1...
  • Page 17 Date - Day - Month (SI Units) Month - Day (US Units) date 1998 Press DISPLAY * 2 3 . 0 7 Time and date of the last logged entry. Pressing the RESET key will display the previous logged entries. tm log 1998 212-M-V2.1...
  • Page 18 Operation Press ACCUM TOTAL 1 2 6 4 3 . 3 2 Energy Total of selected log entry. en log * If logging is not used, pressing the DISPLAY key will return to the Energy display. 212-M-V2.1...

  • Page 19: Charge/Discharge Operation

    6 4 3 2 6 . 5 Accumulated Discharge Energy (non-resettable). ACCUM Press DISPLAY Press ACCUM TOTAL 8 8 8 8.8.8.8 Display segments test. Segments are flashing. TEST 00.0.0.0. Press DISPLAY For continuation of displays refer to Section 3.1.1 Normal Operation . 212-M-V2.1...

  • Page 20: Peak And Off-Peak Operation

    Press ACCUM TOTAL 6 4 3 2 6 . 5 Accumulated Off-Peak Energy (non-resettable). ACCUM 8 8 8 8.8.8.8 Display segments test. Segments are flashing. TEST 00.0.0.0. Press DISPLAY For continuation of displays refer to Section 3.1.1 Normal Operation. 212-M-V2.1...

  • Page 21: Checking Set-Up Parameters

    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:...
  • Page 22 For high alarms it will close if the parameter is above the set point. REL1 Defines the parameter for Relay 1 as in step 8 above. REL1 xxxx.xxx Set point for parameter for Relay 1 as in step 9 above. 212-M-V2.1...
  • Page 23 PULSE 10 ms Defines the pulse width. 20 ms 50 ms 100 ms 200 ms 500 ms COMMS NONE No Communications. M-BUS Meter-bus (see Section 4). RS485 Modbus RTU. BAUD xxxx Communications baud rate between 300 and 9600. 212-M-V2.1...
  • Page 24 Sets the hour at which energy totalisation will commence in the OFF hour PEAK register. (Only displayed if mode is set to Heat, Cool or Heating/Cooling and PK/OPK is set to ON.) Selects the interval at which Logging will take place. MONTH WEEK HOUR 212-M-V2.1...
  • Page 25 Temperatures will be displayed with two decimal places. S/WARE x.xx Software revision number. QUIT Return to normal operation upon pressing the DISPLAY key. Continue in the Check Set-up mode. To continue use the <key to select NO and then press the DISPLAY key . 212-M-V2.1...

  • Page 26: Units Of Measurement

    Operation 3.3 UNITS OF MEASUREMENT The Model 212 can be programmed to operate in both metric and US units. The units which are displayed are fully programmable during the Set-up routine. Metric Energy KCal MCal Power MJ/hour GJ/hour KCal/hour MCal/hour...

  • Page 27: Frequency Cut-Off

    100 seconds, if the signal stops. This is because the time interval between the signal at 0.01Hz is 100 seconds and the Model 212 must wait this long before it can determine that the flow has actually stopped.

  • Page 28: Offset Functions

    The measured offset will then be displayed on the Model 212, the value of which will be stored when the Set-up Mode is exited. The system is then returned to normal by closing valve "A" and opening valves "B"...

  • Page 29: Operating Modes

    Operation 3.6 OPERATING MODES The Model 212 may be programmed to operate in either of four modes, as follows: 1. Heating 2. Cooling 3. Heating/Cooling 4. Charge/Discharge 3.6.1 Heating Heating mode is used when the application is for Heating only and assumes that the Feed Temperature will always be higher than the Return Temperature (positive ∆t).

  • Page 30: Peak And Off-Peak

    Operation 3.7 PEAK AND OFF-PEAK When the Model 212 is programmed for either Heating, Cooling or Heating and Cooling, it is possible to program Peak and Off-Peak times. This enables the Model 212 to record Energy totals in two separate registers, depending on the time of day.

  • Page 31: Logging

    A log entry will occur at 00 hours 00 minutes on the 1st of the month. A total of 31 log entries can be stored and viewed by the Model 212. After 31 entries have been completed, the oldest logged entry is overwritten by the newest logged entry, therefore only the 31 most current logged entries are kept.

  • Page 32: Communications

    These links are accessible by removing the front panel as detailed in section 7.2 and the link positions are as shown in the drawing in section 7.3. Links are made via small black caps which fit over the connecting posts, thereby creating a link. 212-M-V2.1...

  • Page 33: Meter-Bus

    The levels of input voltage/output current are as detailed in EN 1434-3. Bus Address The bus address of the Model 212 is programmable in range between 0 to 250. Some addresses are reserved according to EN 1434-3 and have a special...
  • Page 34 51/55 DATA... Transmission Frames* CONFIRM (acknowledgment of NORMALISE): CONFIRM (acknowledgment): ADR CS CONFIRM (no acknowledgment, link busy): ADR CS RESPOND (no acknowledgment, data is not available): ADR CS RESPOND (data) DATA... * byte values are represented in the hexadecimal format. 212-M-V2.1...

  • Page 35: Infra-Red Communications Link

    Communications 4.2 INFRA-RED COMMUNICATIONS LINK The infra-red communication option uses the Meter-bus protocol as defined in IEC 870-5 and as detailed in EN 1434-3. This function is not implemented at this time. 212-M-V2.1...

  • Page 36: Rs485 With Modbus Rtu Protocol

    Communications 4.3 RS485 WITH MODBUS RTU PROTOCOL Modbus RTU is an industry standard protocol which allows the Model 212 to be easily interfaced to DCS or PLC, or to computers running supervisor software systems. The Model 212 serves as a slave station in communications and includes the RS485 hardware and implementation of the standard protocol according to Modicon Modbus Protocol (RTU-mode) and as detailed in PI-MBUS-300 Rev F.

  • Page 37: Bus Address

    4.3.3 Bus Address The bus address of the Model 212 is programmable in range between 1 to 247. Some addresses are reserved according to PI-MBUS-300 and have a...

  • Page 38: Function Codes

    Preset data register(s) Preset one or more 2 byte data registers. 4.3.5 Exception Response The Model 212 forms an exception response by adding 80H to the function code and using an exception code as the 1 byte data field in the returned frame.

  • Page 39: List Of Data Registers

    Communications 4.3.6 List of Data Registers The following list describes data registers for the Model 212. Engineering units programmed during setup are used for floating point values. Conventional numbering of registers start from 1, therefore be aware that "register 1" in this case has an "address 0" (low level framing) and so on.
  • Page 40 01...12 01...31 Hour 00...23 Minute 00...59 Peak mode 00 - off 01 - on Peak on setpoint 00...23 Peak off setpoint 00...23 Logging mode 00 - off 01 - month 02 - week 03 - day 04 - hour 212-M-V2.1...
  • Page 41 Accumulated energy 1 Volume Accumulated volume Not Used Not Used Elapsed time Accumulated elapsed time Power Peak power Volume flow Not Used Flow temperature Return temperature Temperature difference Supply failures Exception register 00 - no failure 01 - RTD failure 212-M-V2.1...
  • Page 42 Volume unit SI: 00 - ltr 01 - m 3 US: 00 - gallon 01 - ft 3 Power unit SI: 00 - MJ/hour 01 - GJ/hour 02 - kW 03 - MW 04 - KCal/hour 05 - MCal/hour 212-M-V2.1...
  • Page 43 1st byte (MSB) high byte (register X) 2nd byte low byte (register X) 3rd byte high byte (register X+1) 4th byte (LSB) low byte (register X+1) This means that two data registers must be read/written to obtain/preset one data value. 212-M-V2.1...

  • Page 44: Set-Up Mode

    The item which can be changed flashes. Thus the instrument can be fully programmed on-site without having to purchase a separate programmer. If the Set-up access pushbutton is pressed while the Model 212 is in Set-up Mode, the display will return to step 1.
  • Page 45 (See flowmeter manufacturer's data.) CUTOFF x.xx Hz Low frequency cut-off of the flowmeter, expressed in Hz. The Model 212 will not register flow if the input frequency is below this value. Note that the default is 0.25Hz and it is recommended to not change this value unless the flowmeter produces very low frequencies.
  • Page 46 Set point for parameter for Relay 1 as in step 14 above. If 4-20mA Output is installed: 4-20mA Flow Defines the parameter to be output ∆t° as a Ft° 4-20mA signal. Rt° xxxx.xxx Flowrate or temperature which corresponds to 4mA. 212-M-V2.1...
  • Page 47 Set-up Mode continues at step 25. Meter-bus (see Section 4). M-BUS Modbus RTU. RS485 BAUD xxxx Communications baud rate between 300 and 9600. PARITY Even/Odd/None Communications parity (with Meter- bus the parity is not changeable and is set to even parity). 212-M-V2.1...
  • Page 48 MONTH WEEK Logging is only available if the mode (step 2) is set to Heating, Cooling or HOUR Heating/Cooling and the Peak/Off- Peak (step 27) is set to OFF. logging is not available, this step will not be displayed. 212-M-V2.1...
  • Page 49 Temperatures will be displayed with two decimal places. QUIT Return to normal operation upon pressing the DISPLAY key. Continue in the Set-up mode. To continue use the < key to select NO and then press the DISPLAY key. 212-M-V2.1...

  • Page 50: Input & Output Connections

    This is supplied by the flowmeter manufacturer and represents the number of pulses per litre, m3, gallon or ft3 that the flowmeter outputs for each unit of volume. It is often referred to as the K-factor. 212-M-V2.1...
  • Page 51 Input & Output Connections 212-M-V2.1...
  • Page 52 Input & Output Connections 1. Pulse Links 2. Reed Switch Links 3. Coils eg. mV signals from turbine flowmeters or Links 212-M-V2.1...
  • Page 53 Input & Output Connections 4. Opto-Sensors Links 5. Namur Switch Links 212-M-V2.1...

  • Page 54: Rtd Input

    Input & Output Connections 6.2 RTD INPUT The Model 212 uses four wire RTDs to provide optimum accuracy and stability. The RTDs are high grade 100 ohm platinum types manufactured to BS1094 standards. For maximum accuracy, RTDs should be a matched pair, Class A to IEC 751 standard.

  • Page 55: Power Supply

    Input & Output Connections 6.3 POWER SUPPLY The Model 212 will operate from a central 12-24 Volts dc source and typically draws around 60mA. A power adapter is supplied as standard and this supply can also be used to power the flowmeter, alarms and peripheral items.

  • Page 56: Pulse Output

    Input & Output Connections 6.4 PULSE OUTPUT A pulse output is available on terminals 16 and 17. The output is an open collector transistor suitable for external counters.   Linked internally 212-M-V2.1...
  • Page 57 0.0167m 3 /sec. If a pulse occurs every 0.001m 3 then the output frequency would be 16.7Hz. Duration of the pulse is programmable as 10, 20, 50, 100, 200 or 500ms and determines the maximum pulse output frequency: 1000 pulse Width in ms) 212-M-V2.1...

  • Page 58: Alarm Relay Outputs

    On State Resistance 6 ohms maximum The relays can be individually programmed during Set-up to alarm Flow rate Low or High Power Low or High Feed Temperature Low or High Return Temperature Low or High Temperature Difference Low or High 212-M-V2.1...
  • Page 59 Relay 1 can be programmed to alarm if the power consumption exceeds a preset value. In the alarm condition the relays are closed, and are open in the non- alarm condition or when the instrument is unpowered. 212-M-V2.1...

  • Page 60: 4-20Ma Output Option

    The maximum output voltage is the supply voltage less 6 volts. Therefore the maximum load resistance can be calculated as: Supply Maximum Load = 0.02 At 24 volts, Rmax = 900 ohms and at 12 volts, Rmax = 300 ohms . 212-M-V2.1...
  • Page 61 Response Time: 0.5 seconds to 99% of step. The output can be programmed to output the following: Volumetric Flowrate Energy Flowrate (power) Feed Temperature Return Temperature Temperature Difference The 4mA point and 20mA point can be individually programmed during setup. 212-M-V2.1...

  • Page 62: Installation

    Installation 7. INSTALLATION 7.1 WALL MOUNTING A wall mounting bracket is supplied with each instrument. A drilling diagram is outlined on the following page. 212-M-V2.1...
  • Page 63 Installation 212-M-V2.1...

  • Page 64: Panel Mount Version

    Installation 7.2 PANEL MOUNT VERSION The panel mount version of the Model 212 is supplied with two panel mount brackets and plug-in terminals which are accessible from the rear of the instrument. A diagram of the rear panel is shown below. Note that access to the Input Circuit Links 1-3 and Communication Links 4-7 can only be obtained by opening the instrument.

  • Page 65: Removing The Front Panel

    O-rings. 3. Pull the front panel free from the housing. Replacing the front panel of the instrument is the reverse procedure. However, ensure that the front panel is aligned at both connector points before tightening the screws. 212-M-V2.1...
  • Page 66 Installation 212-M-V2.1...

  • Page 67: Verification Seal

    A Verification Seal is supplied with the instrument and can be placed across the calibration switch to prevent unauthorised tampering. The seal is made from a self adhesive material which is destroyed if the seal is broken. Verification Label for Calibration. 212-M-V2.1...

  • Page 68: Wiring Practices

    It is good wiring practice to use shielded cables for all connections to the Model 212. Care must be taken to separate signal cables from power cables and relay cables, so as to minimise interference.
  • Page 69 Installation 4-20mA Option TERMINATION BOARD 212-M-V2.1...

  • Page 70: Terminal Designations

    52 + Relay 0 (+) dc Voltage Only or 4-20mA (+) 53 - Relay 0 (-) dc Voltage Only or 4-20mA (-) 54 + Relay 1 (+) dc Voltage Only 55 - Relay 1 (-) dc Voltage Only Shields 212-M-V2.1...

  • Page 71: Index

    Power Adapter, 53 Display Mode, 11 Power Requirements, Power Supply, 53 Language, 19 Lead Lengths, 52 Pressures, 3 EMC, 4 Protocol, 31 Links, 48 EMC Directive, 66 Location, 20 Pulse Inputs, 48 Emission, 4 Logging, 29 Pulse Output, 21, 54 212-M-V2.1...
  • Page 72 Set-up Mode, 42 Shielded Cables, 66 Shields, 66 Software Revision, 23 Solid State dc Relays, 56 Specification, 7 Temperature Difference, 7 Temperature Range, 7 Terminal Designations, 68 Termination Board, 67 Ton, 6 Units of Measurement, 24 Verification Seal, 65 212-M-V2.1...

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