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Table of Contents
Related Manuals for Contrec 202A
Summary of Contents for Contrec 202A
- Page 1 FIELD MOUNTED RATE TOTALISER MODEL 202A 202A-M-V3.1 June 2017...
- Page 2 202A-M-V3.1...
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Page 3: Table Of Contents
3.5 Example 4. Signal Input 5. Alarm & Pulse Outputs 6. Intrinsic Safety Connections 7. Installation 7.1 Wall Mounting 7.2 Panel Mount Version 7.3 Removing the Front Panel 7.4 The Main Electronics 7.5 Wiring 7.6 Maintenance 7.7 Terminal Designations Index 202A-M-V3.1... - Page 4 202A-M-V3.1...
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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 7.5 must be followed. 202A-M-V3.1... -
Page 6: Model Number Versions
0 No holes drilled for cable entry 1 Panel mount 2 Wall mount (standard) 6 for Pipe mounting The Wall mount instrument is supplied with cable glands that are watertight and have integral strain relief. Approval Versions CSA USA / Canada Approval M ATEX/IECEx Approval 202A-M-V3.1... - Page 7 Introduction The Model 202A 202A-M-V3.1...
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Page 8: Intrinsic Safety Approvals
The input can be connected to IS circuits with the following maximum values: Ui = 28V Ii = 93mA Pi = 653mW Relay Outputs The outputs can be connected to IS circuits with the following maximum values: Ui = 28V Ii = 93mA Pi = 653mW 202A-M-V3.1... -
Page 9: Operation
Note that when the input signal drops below 3.75mA (4-20mA input), a signal error will occur. The display will alternate between the current total and the word "SIGNAL". When the input signal drops below ≈3.5mA the Model 202A shuts down saving totals in the non-volatile memory. -
Page 10: Specification
Signal Type: 4-20mA. 4-20mA Input Resolution and Linearity: 0.05% of span. Accuracy: 0.05% of span @ 25°C. 0.1% (typ) of span, full temperature range. Update Time: 0.5 seconds. Connection: Two wire. Voltage Drop: 2.5 volts maximum. 202A-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 202A to be attached to a 2" vertical or horizontal pipe. Panel Mounting: Supplied with mounting brackets. Terminals accessible from rear. (Note that the panel mount version is not watertight.)
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Page 12: Programming
Programming 3. PROGRAMMING The Model 202A is fully programmable, with all parameters being stored in non- volatile memory. The Program Mode can be entered in the following way: By removing the lower cover strip (i.e. the dark grey strip along the bottom of the enclosure) and replacing it the wrong side up. -
Page 13: Program Steps
The flowrate can be displayed with 0, 1, 2 or 3 decimal point places. CAL 05 Timebase for Rate. The Rate can be displayed in units per second, minute, hour or day. 0 = second 1 = minute 2 = hour 3 = day. See section 3.2. 202A-M-V3.1... - Page 14 Totals to be displayed in another engineering unit. The Total Conversion Factor can be programmed in the range of 0.000001 - 999,999. Set to 1.000 if totals and rate are in the same unit eg. litres. See section 3.3. CAL 10 Low Alarm - whole numbers. 202A-M-V3.1...
- Page 15 Input Flow Relationship. 0 = Linear Input 1 = Square Root Input CAL 15 Accumulated Total Reset. CAL 15 displays the accumulated total which can be reset by pressing and holding the RESET key for about 5 seconds. SOFT Software Version. 202A-M-V3.1...
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Page 16: Calculation Of Rate And Total
The Span, S, can be set during calibration anywhere in the range of 0.000001 to 999,999. The Span, S, is programmed in units of volume per timebase (ie. litres/minute or kilograms/hour). This also means that the Total will be displayed with the same unit of volume, ie. litres or kilograms. 202A-M-V3.1... - Page 17 Rc = 2200 x 0.2 = 440 kg/min The value of A which would produce this cutoff is: A = 0.04 (since 0.04 = 0.2) and the input signal would be: I = 16mA x 0.04 + 4mA = 4.64mA 202A-M-V3.1...
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Page 18: Total Conversion
Some common units are given below together with the Total Conversion constant which should be programmed. Rate* Totals TOTCON Gallons (US)/ Barrels (oil) 42.000 Litres/ Kilolitres 1000 Litres 1000 Mgallons/ Acre-feet 0.32587 * Units per second, minute, hour or day. The timebase is programmed separately during Programming. 202A-M-V3.1... -
Page 19: Filtering
Frequency fluctuations caused by pulsating flow through a flowmeter, often makes the Rate impossible to read with any precision. The Model 202A has a digital filter which will average out these fluctuations and enable the Rate to be read to four digit accuracy. The ability to select a suitable filtering level means that highly accurate and stable readings can be obtained without excessive lag. - Page 20 Programming Table 1 - Response to a step Input (in seconds). Note that if CAL 06 is set to 01 there is no filtering of the input signal. 202A-M-V3.1...
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Page 21: Example
0001 Total Conversion (set to 1.0000) CAL09 0000 Total Conversion (decimals) CAL10 00002 Low Alarm CAL11 0000 Low Alarm CAL12 00018 High Alarm CAL13 0000 High Alarm CAL14 0 Linear Input CAL15 xxxx Accumulated Totals SOFT 202A1.11 Software Version 202A-M-V3.1... -
Page 22: Signal Input
Signal Input 4. SIGNAL INPUT The signal input is on terminals 3 and 4 and can be connected as follows: 202A-M-V3.1... -
Page 23: Alarm & Pulse Outputs
0.8VDC across Outputs when in the "on" state. Isolation: Both outputs are separately isolated. Pulse Frequency: 500Hz maximum. Pulse Duration: 1ms if output frequency > 50Hz. 10ms if output frequency = 5 ... 50Hz. 100ms if output frequency < 5Hz. 202A-M-V3.1... - Page 24 Alarm & Pulse Outputs Connections 202A-M-V3.1...
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Page 25: Intrinsic Safety Connections
The 4-20mA input and alarm outputs must, therefore, only be connected as shown on the following page, to barriers with the specified parameters. The Model 202A will connect directly to a 4-20mA current loop and alarms, provided they do not exceed the following input parameters: Ui = 28V... - Page 26 Intrinsic Safety Connections 202A-M-V3.1...
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Page 27: Installation
(do not use counter sunk screws). The bracket is mounted with the "tray" section at the bottom. The instrument is then attached to the bracket at the bottom with two screws (see diagram below). 202A-M-V3.1... -
Page 28: Panel Mount Version
The panel mount version of the Model 202Ai 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. The cutout for the panel mount version is 141mm (5.55") wide x 87mm (3.43") high. 202A-M-V3.1... -
Page 29: 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. 202A-M-V3.1... - Page 30 Installation 202A-M-V3.1...
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Page 31: The Main Electronics
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 and calibration parameters to default values. Display Contrast RESET The Main Electronics 202A-M-V3.1... -
Page 32: Wiring
Electromagnetic Compatibility as per EMC-Directive 2004/108/EC of the Council of the European Community. 7.6 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 33: Terminal Designations
I nstallation 7.7 TERMINAL DESIGNATIONS 4-20mA Input 4-20mA (-) 4-20mA (+) Outputs Low Alarm (-) Low Alarm (+) High Alarm (-) or Pulse Output (-) High Alarm (+) or Pulse Output (+) 202A-M-V3.1... -
Page 34: Index
Hi Test, 6 High Alarm, 13 Temperature, 9 Terminal Designations, 31 Installation, 25 Test Mode, 6 Intrinsic Safety, 7 Timebase, 11 Total Conversion, 16 Lo Test, 6 Low Alarm, 12 Wall Mounting, 25 Model Number, 4 Operating Temperature, 9 Operation, 6 202A-M-V3.1...
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