Contrec 102D Manual
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Contrec 102D Manual

Field mounted rate totaliser
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FIELD MOUNTED
RATE TOTALISER
MODEL 102D
APRIL 2019
MAN102D-V1.8

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Summary of Contents for Contrec 102D

  • Page 1 FIELD MOUNTED RATE TOTALISER MODEL 102D APRIL 2019 MAN102D-V1.8...

  • Page 2: Table Of Contents

    CONTENTS 1. Introduction 2. Specification 3. Operation 3.1 Display 3.2 Test Mode 3.3 Filtering 3.4 Calculation of Rate and Total 3.5 Total Conversion 3.6 Frequency Cutoff 4. Programming 4.1 Program Steps 5. Example 6. Power 7. Flowmeter Input Installation Wall Mounting Removing the Front Panel The Main Electronics Wiring...
  • Page 3 MAN102D-V1.8...

  • Page 5: Introduction

    The instrument is fully programmable from the front panel; the user can program scaling factors, decimal point positions, filter constants and timebase. The Model 102D Rate Totaliser conforms to the EMC-Directive of the Council of European Communities 2014/30/EU, the LVD directive 2014/35/EU and the...

  • Page 6: Specification

    2 Specification 2. SPECIFICATION General Display: LCD which is continuously powered. Resettable Total: 7 digits with 10mm (0.4") high digits. Resettable from front panel. Accumulated Total: Displayed when the ACCUM TOTAL button is pressed. Rate: 4½ digits with 8.5mm (0.33") high digits. K-factor: The pulses per unit of measure (eg.
  • Page 7 Wall Mounting: Universal mounting bracket supplied as standard. Pipe Mounting: A galvanised metal bracket is available which enables the Model 102D to be attached to a 2" vertical or horizontal pipe. Cutout: 141mm (5.6") wide x 87mm (3.4" high). MAN102D-V1.8...

  • Page 8: Operation

    4 Operation 3. OPERATION The Model 102D 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 10 years in the event of a power loss.

  • Page 9: Test Mode

    Operation 5 3.2 TEST MODE The 102D has a Test Mode which can be entered by simultaneously pressing all 3 front panel keys. The tests are as follows: Low Test N/A. High Test N/A. Display Test By pressing the PROGRAM key, all segments of the display will flash.

  • Page 10: Filtering

    6 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 102D has a digital filter which will average out these fluctuations and enable accurate readings.
  • Page 11 Operation 7 Filter Factor vs Time to Reach New Reading (for a step change in input signal) Filter Factor 90% of New Reading 99% of New Reading MAN102D-V1.8...

  • Page 12: Calculation Of Rate And Total

    8 Operation 3.4 CALCULATION OF RATE AND TOTAL The flow rate, R, is calculated as follows: f x H where f is the input frequency in Hz (pulses/second). H is the timebase of rate and is 1 for seconds, 60 for minutes, 3600 for hours and 86,400 for days.

  • Page 13: Total Conversion

    Operation 9 3.5 TOTAL CONVERSION The Total Conversion Factor is programmed to enable the rate to be displayed in one engineering unit and the totals to be displayed in another. For example, the rate can be displayed in gallons/minute and the totals in barrels. The Total Conversion Factor is a division factor which is used to convert the totals to a different unit.

  • Page 14: 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 102D 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 15: Programming

    Programming 11 4. PROGRAMMING The Model 102D 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 16: Program Steps

    12 Programming 4.1 PROGRAM STEPS Step Comment CAL 0 CAL 1 Scaling Factor - whole numbers. CAL 2 Scaling Factor - digits after the decimal point. The scaling factor is the pulses per unit of measure (eg. pulses/litre, pulses/gallon, etc). The scaling factor can be programmed in the range of 0.000001 - 999,999.
  • Page 17 Programming 13 Step Comment CAL 5 Timebase for Rate. The rate can be displayed in units per second, minute, hour or day. 0 = second 1 = minute 2 = hour 3 = day CAL 6 Filter. The filter constant for filtering the input signal. 1 No filtering.
  • Page 18 14 Programming Step Comment CAL 9 Total Conversion Factor - digits after the decimal point. The total conversion factor enables the rate to be displayed in one engineering unit and the totals to be displayed in another engineering unit. The total conversion factor can be programmed in the range of 0.000001 - 999,999.
  • Page 19 Programming 15 CAL 18 Enabling and number of points for linearisation ’00’ = Linearity Disabled; ‘02’ – ‘10’ number of points If linearity is enabled by entering a number 02-10, then the programming will request data as per the table below. Input points are entered in ascending order.

  • Page 20: Example

    16 Example 5. EXAMPLE A flowmeter produces 20.538 pulses per litre and has a maximum output frequency on 200Hz. It is required to display the flow rate in litres/min with 1 decimal point and the total in litres with no decimals. Calibration mode is entered by removing the lower cover strip (ie.

  • Page 21: Power

    Power 17 6. POWER 6.1 BATTERY POWERED The instrument uses a lithium battery for powering the display. No external power supply is required. The two Lithium cells are 3.6V, AA types. e.g. TADIRAN SL360/S, SAFT LS14500EX. Note the battery polaririty when replacing. MAN102D-V1.8...

  • Page 22: Flowmeter Input

    18 Flowmeter Input 7. FLOWMETER INPUT The Model 102D has an input conditioning circuit which will accept signals from most pulse or frequency producing flowmeters. Links on the LCD panel enable the input circuit to be configured for different signal types.
  • Page 23 Flowmeter Input 19 +3.3V +3.3V Ipull-up = 0 uA (PULSE link (link 1) not installed) Ipull-up = 15 uA (PULSE link, no external power) Ipull-up = 150 uA (PULSE link, external power) INPUT COMPARATOR 825R FR + LINK 2 1.3V NPS (LINK 3) COIL (LINK 1) 100K...
  • Page 24 20 Flowmeter Input 1. Squarewave, CMOS or Pulse Link Settings FR + FR - Switching threshold voltage is 1.3 volts. 2. Open Collector With 15A/150A internal pull up current Link Settings FR + FR - 3. Reed Switch - Battery Powered Link Settings With 15A internal pull up current FR +...
  • Page 25 Installation 21 MAN102D-V1.8...
  • Page 26 22 Flowmeter Input 4. Reed Switch - External DC Power Link Settings With 150A internal pull up current FR + FR - Note: For a switch or reed input with contact bounce link DBH can be switched "on". This will eliminate the effect of switch bounce while limiting the input frequency to 200Hz.

  • Page 27: Installation

    Installation 23 8. INSTALLATION 8.1 WALL MOUNTING A wall mounting bracket is supplied with each instrument. Round head screws should be used to attach the bracket to the wall (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.

  • Page 28: Removing The Front Panel

    24 Installaton 8.2 REMOVING THE FRONT PANEL The front panel should be removed as follows: 1. Remove the top and bottom cover strips (ie. the dark plastic strip) by levering a screwdriver under one end. 2. Undo the screws retaining the front. Do not remove the screws, they are retained by O-rings.

  • Page 29: The Main Electronics

    Installation 25 8.3 THE MAIN ELECTRONICS The front section of the housing contains the microprocessor and display. It is possible to adjust the display contrast via a small potentiometer on the board. The Display Contrast is shown below and this can be adjusted for optimum contrast.

  • Page 30: Wiring

    26 Installation 8.4 WIRING When connecting the 102D it is good practice to use shielded cable. The shield should be connected to earth at one end of the cable. The other end of the shield should not be connected. This wiring practice is mandatory in order to comply with the requirements for Electromagnetic Compatibility as per EMC-Directive 2014/30/EU of the Council of the European Community.

  • Page 31: Disposal

    Contact your local environmental authority for information regarding disposal or recycling of used batteries, alternatively they can be returned directly to Contrec Ltd. for disposal. Please Contact Contrec Ltd. before returning batteries for disposal, Contrec Ltd will not be responsible for any shipping costs incurred.

  • Page 32: Index

    28 Index Index Accumulated Total, 2 Power, 18 Programming, 11 CAL Sequences, 12 Cutoff Frequency, 12 Rate, 2 Remote Switches, 26 Removing the Front Decimal Point, 11, 12 Panel, 24 Display, 2, 4 Resettable Total, 2 Disposal, 27 Display Test, 5 Scaling Factor, 2, 16 Specification, 2 Filtering, 6...

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