Contrec 202D User Manual
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Contrec 202D User Manual

Field mounted rate totaliser
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FIELD MOUNTED
RATE TOTALISER
MODEL 202D
June 2017
202D-M-V3.1

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Summary of Contents for Contrec 202D

  • Page 1 FIELD MOUNTED RATE TOTALISER MODEL 202D June 2017 202D-M-V3.1...
  • Page 2 To preserve battery life, the batteries may have been disconnected and may need to be reconnected. To do this follow the steps outlined in section 9.3. There are two battery packs (see the diagram in section 9.4) and both packs must be connected. 202D-M-V3.1...

  • Page 3: Table Of Contents

    8.2 Simple Apparatus 8.3 Namur Proximity Switches 8.4 4-20mA Output 8.5 Alarm Outputs 9. Installation 9.1 Wall Mounting 9.2 Panel Mount Version 9.3 Removing the Front Panel 9.4 The Main Electronics 9.5 Wiring 9.6 Maintenance 9.7 Terminal Designations Index 202D-M-V3.1...
  • Page 4 202D-M-V3.1...

  • Page 5: Introduction

    – EMC requirements : Residential, Commercial & Light Industry Environment & Industrial Environment. EN61010:2010 Safety requirements for electrical equipment for measurement, control, and laboratory use. In order to comply with these standards, the wiring instructions in Section 9.5 must be adhered to. 202D-M-V3.1...
  • Page 6 Ÿ The 202D output board can have both ALARMS and a 4-20mA OUTPUT. Ÿ The voltage drop across the alarm outputs in the 202D is ONLY 0.8 VOLTS. Ÿ The voltage supply for the DC and loop powered versions can go AS LOW AS 9 VOLTS.

  • Page 7: Model Number Designation

    2 Wall mount (standard) 3 DC powered with battery backup 4 Turbine adaptor and alarm outputs 6 2" pipe mount (galvanised) 4 Loop powered with 4-20mA output, alarm outputs and backup batteries Approvals C CSA USA/Canada approval M ATEX/IECEx Approval 202D-M-V3.1...

  • Page 8: Intrinsic Safety Approvals

    4-20 mA/DC Power The input can be connected to IS circuits with the following maximum values: Ui = 28V Ii = 93mA Pi = 653mW The internal capacitance and inductance seen on these terminals is 0.1uF and 0mH. 202D-M-V3.1...
  • Page 9 The internal capacitance and inductance seen on these terminals is 0.02uF and 0mH. Output parameters are: Uo = 10.0V (open circuit) Io = 9.0mA (short circuit) Po = 23mW Maximum allowed external capacitance is 20µF. Maximum allowed external inductance is 1.5H. 202D-M-V3.1...

  • Page 10: Specification

    The 4mA and 20mA points are programmable. Resolution and Linearity: 0.05% of span. Accuracy: 0.05% of span at 25°C. 0.1% (typ) of span, full temperature range. Update Time: 0.5 second. Connection: Two-wire. Loop Power Supply: 9-28 Volts. Supply Backup: Lithium battery. 202D-M-V3.1...
  • Page 11 Wall Mounting: Universal mounting bracket supplied as standard. Pipe Mounting: A galvanised metal bracket is available which enables the Model 202D to be attached to a 2" vertical or horizontal pipe. Turbine Meter Adaptor: An optional mounting stem is available for mounting the Model 202D directly on turbine flowmeters which have a 1"...

  • Page 12: Operation

    Operation 3. OPERATION The Model 202D Rate Totaliser accepts a frequency or pulse input from a wide range of flowmeters. The instrument is fully programmable with all operating parameters and calculation constants programmable from the front panel. The setup parameters are stored in a non-volatile memory and are retained for at least 40 years in the event of a power loss.

  • Page 13: Test Mode

    O peration 3.2 TEST MODE The 202D has a Test Mode which can be entered by simultaneously pressing all 3 front panel keys. The tests are as follows: Low Test By pressing the ACCUM TOTAL key, the low alarm output (if installed) will go low. If a 4- 20mA option is installed, the output will go to 4mA.

  • Page 14: Filtering

    Operation 3.3 FILTERING Frequency fluctuations caused by pulsating flow through a flowmeter can interfere with the precision of the rate. For this reason, the Model 202D has a digital filter which will average out these fluctuations and enable accurate readings.

  • Page 15: Calculation Of Rate And Total

    The K-factor is flowmeter dependant and is supplied with the flowmeter. It will be either on a calibration certificate or stamped on the body of the meter. The user programs the scaling factor and selects the timebase during the programming procedure. 202D-M-V3.1...

  • Page 16: Total Conversion

    Below is a table containing common units and their corresponding Total Conversion constants: Rate/Unit Time Totals Total Conversion Factor Gallons (US)/Unit Time Barrels (oil) 42.000 Litres/Unit Time Kilolitres 1000 Litres/Unit Time 1000 ml/Unit Time Litres 1000 Mgallons/Unit Time Acre-feet 0.32587 202D-M-V3.1...

  • Page 17: Frequency Cutoff

    Note that a low cutoff frequency will result in a correspondingly low response of flow rate update. For example, if the cutoff is set to 0.01Hz the 202D will continue to display the flow rate for 100 seconds even if the signal stops. This is because a cutoff frequency of 0.01Hz means that the time interval between...

  • Page 18: Linearisation

    Factor 1 which maintains a constant value between Frequency 1 and any Frequency below Frequency 1. Note that the display update time will be increased to 1 second when the non linear correction option is selected with the battery powered version of the 202D. 202D-M-V3.1...

  • Page 19: Programming

    Programming 4. PROGRAMMING The Model 202D is fully programmable with all parameters being stored in non-volatile memory. The Program Mode can be entered in one of two ways: 1. By removing the lower cover strip (ie. the dark grey strip along the bottom of the enclosure) and replacing it the wrong side up.

  • Page 20: Program Steps

    The rate can be displayed in units per second, minute, hour or day. 0 = second 1 = minute 2 = hour 3 = day Filter. CAL 6 The filter constant for filtering the input signal. 1 No filtering. 99 Very heavy filtering. 202D-M-V3.1...
  • Page 21 The value can be programmed in the range 0.000000 to 999,999. If the scaled pulse output is selected (see CAL0 = 1), then the value will represent the total per pulse, e.g. 5 litres per pulse. 202D-M-V3.1...
  • Page 22 Scaling Factor ‘01’ whole number OUT .00 Scaling Factor ‘01’ digits after decimal point Repeat the above for the remaining scaling factors. Any frequency greater than that of the last linearity point will be scaled at the last Scaling Factor. Software Version. SOFT 202D-M-V3.1...

  • Page 23: Example

    High Alarm (not installed) CAL12 0000 High Alarm (not installed) CAL13 00000 4mA Output (whole numbers) CAL14 0000 4mA Output (decimals) CAL15 00500 20mA Output (whole numbers) CAL16 0000 20mA Output (decimals) CAL17 Linearity number of points CAL18 1.01 Software Version SOFT 202D-M-V3.1...

  • Page 24: Versions

    Versions 6. VERSIONS The following table summarises the features of each of the different versions of the Model 202D: Model Number 202DI.X0 202DI.X3 202DI.X4 Battery Version DC Powered Loop Powered Powered Loop DC Powered; Powered; 9-28 Power Lithium 9-28V at 4mA...

  • Page 25: Battery Powered Version

    5 years and the operator is warned of a low power condition by a message on the LCD display. New batteries can be purchased via Contrec or our distributors and replaced in the field without compromising the IS approvals. There are two battery packs in each instrument and care must be taken to replace only one pack at a time so that there is always power connected to the memory.

  • Page 26: Dc Power Version

    If a scaled pulse output is programmed, a pulse will be output every preset value of the total. For example, if the total is in litres, then programming 5 will output one pulse every 5 litres. If an unscaled pulse output is programmed, output pulses will follow input frequency from a flowmeter. 202D-M-V3.1...
  • Page 27 1ms if CAL0 = 2 (unscaled pulse output). If CAL0 = 1 (scaled pulse output) the duration of the pulse automatically adjusts to the output frequency: a. 1ms if output > 50Hz. b. 10ms if output = 5...50Hz. c. 100ms if output < 5Hz. 202D-M-V3.1...

  • Page 28: Relay And 4-20Ma Output Version

    Loop Power Supply: 9-28 Volts. Since the 4-20mA output is designed to provide power to the Model 202D, it is not isolated from the input. Hence, all sensors must be self-powering (such as reed switches and coils). If external power is required to power the sensor (e.g.
  • Page 29 Versions Typical Connection Connection to a Sensor requiring External Power 202D-M-V3.1...

  • Page 30: Flowmeter Input

    26 Flowmeter Input 7. FLOWMETER INPUT The Model 202D has an input conditioning circuit which will accept signals from most pulse or frequency producing flowmeters. Links on the rear panel enable the input circuit to be configured for different signal types.
  • Page 31 Flowmeter Input 202D-M-V3.1...
  • Page 32 Positive displacement flowmeters with reed switch outputs. Note: For a switch or reed input with contact bounce link DBL can be switched "on". This will eliminate the effect of switch bounce while limiting the input frequency to 200Hz. 202D-M-V3.1...
  • Page 33 825R input impedance eg. Millivolt signal from paddlewheel or turbine (15mV P-P minimum). Note: If the input has a very high impedance, Link Settings the following link settings should be used: COIL PULSE Link 1 Link 2 Link 3 202D-M-V3.1...
  • Page 34 Link 3 825R input impedance For IS connections of Namur switches see Section 8. Note: Use this connection for a DC powered version of the Model 202D . 7. Namur Proximity Switch - External DC Power Link Settings COIL PULSE...

  • Page 35: Intrinsic Safety Connections

    Ci = 0.02uF and Li = 0mH. The maximum voltage and current produced by the Model 202Di on its inputs (terminals 8 & 7) are: Uo = 10.0V (open circuit) Io = 9.0mA (short circuit) Po = 23mW 202D-M-V3.1...

  • Page 36: Simple Apparatus

    Devices such as reed switches which can be classed as "simple apparatus", as defined in the CENELEC standards EN60079, can be connected to the Model 202D without certification. 8.3 NAMUR PROXIMITY SWITCHES Connection to certified Namur proximity switches is permitted as shown on...
  • Page 37 I ntrinsic Safety Connections Input 202D-M-V3.1...

  • Page 38: 4-20Ma Output

    The 4-20mA anaolg output can be connected to suitably certified devices providing the circuit is protected with a barrier with the maximum safety parameters: Uo = 28V Io = 93mA Pmax = 0.653W The input capacitance on these terminals is 0.1uF max and the inductance is negligible. 202D-M-V3.1...
  • Page 39 I ntrinsic Safety Connections 202D-M-V3.1...

  • Page 40: Alarm Outputs

    The input capacitance on these terminals is 0.1uF max and the inductance is negligible. Note that the two alarm outputs must be kept as independent IS circuits and each protected with their own barrier. It is not permissible to connect these circuits via a common barrier. 202D-M-V3.1...
  • Page 41 Intrinsic Safety Connections 202D-M-V3.1...

  • Page 42: Installation

    (countersunk screws should not be used). The bracket is mounted first with the tray section at the bottom. The instrument is then mounted on the bracket with two screws as shown below. 202D-M-V3.1...

  • Page 43: Panel Mount Version

    Installation 9.2 PANEL MOUNT VERSION The panel mount version of the Model 202D is supplied with two panel mount brackets and plug-in terminals which are accessible from the rear of the instrument. Rear View of 202D Panel Mount Case The cutout for the panel mount version is 141mm (5.55") wide x 87mm (3.43") high.

  • Page 44: Removing The Front Panel

    2. Undo the screws retaining the front. Do not remove the screws, they are retained by O-rings. 3. Remove the front panel from the housing. To replace the front cover, follow the above procedure in reverse. Ensure that the front panel is aligned at connector points before tightening the screws. 202D-M-V3.1...
  • Page 45 I nstallation 202D-M-V3.1...

  • Page 46: The Main Electronics

    The Display Contrast is shown below and this can be adjusted for optimum contrast. Adjacent to this control is a RESET switch which can be used to reset the microprocessor. Note that pressing this button will set all totals to zero. Display Contrast RESET Battery Connector BATTERY BATTERY Battery Connector 202D-M-V3.1...

  • Page 47: Wiring

    Electromagnetic Compatibility as per EMC-Directive 2004/108/EC of the Council of the European Community. 9.6 MAINTENANCE All printed circuit boards must be repaired by Contrec. In the case of a fault, no attempt should be made to repair the board as the intrinsically safe certification may be impaired.

  • Page 48: Terminal Designations

    High Alarm (-) or Pulse Output (-) if installed High Alarm (+) or Pulse Output (+) if installed Low Alarm (-) if installed Low Alarm (+) if installed 4-20mA Output 4-20mA (+) 4-20mA (-) DC Power Versions DC Power +9 to 28V DC Power 202D-M-V3.1...
  • Page 49 Flow Rate, 12 Scaling Factor, 12, 16 Frequency Cutoff, 14 Specification, 6 High Alarm, 18 Temperature, 9 High Test, 9 Terminal Designations, 44 Test Mode, 9 Input Signal, 26 Timebase, 16 Installation, 38 Total Conversion, 13 Intrinsic Safety, 4, 31 202D-M-V3.1...

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