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Contrec 103D Manual

Field mounted rate totaliser
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FIELD MOUNTED
RATE TOTALISER
MODEL 103D
APRIL 2019
MAN103D-V1.3

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  • Page 1 FIELD MOUNTED RATE TOTALISER MODEL 103D APRIL 2019 MAN103D-V1.3...
  • Page 2 MAN103D-V1.3...

  • Page 3: 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 4 MAN103D-V1.3...

  • 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 103D 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 103D to be attached to a 2" vertical or horizontal pipe. Cutout: 141mm (5.6") wide x 87mm (3.4" high). MAN103D-V1.3...

  • Page 8: Operation

    4 Operation 3. OPERATION The Model 103D 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 103D 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.

  • 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 103D 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 MAN103D-V1.3...

  • 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 103D 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

    Programing 11 4. PROGRAMMING The Model 103D 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 Pulse Output 0 = No pulse output, low and high alarms. 1 = Scaled pulse output and low alarm. 2 = Unscaled pulse output and low alarm. CAL 1 Scaling Factor - whole numbers. CAL 2 Scaling Factor - digits after the decimal point.
  • Page 17 Programing 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 Programing 15 Step Comment CAL 13 High Alarm or Pulse Output Factor - digits after the decimal point. CAL 12 & 13 program the flow rate above which the high alarm relay will close. The value can be programmed in the range 0.000000 to 999,999.
  • Page 20 16 Programming 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 21: Example

    Example 17 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 22: Power

    18 Power 6. POWER 6.1 DC POWER The DC power version will operate from an external power source between 9- 28VDC and draws no more than 4mA. This enables the instrument to be powered from AC mains adaptors and eliminates the need to run mains voltages in the field.
  • Page 23 Power 19 Specification for Alarm Outputs Maximum Current (sink): 200mA. Maximum Voltage: 30Vdc. Saturation Voltage: 0.8Vdc across outputs when in the "on" state. Isolation: Both outputs are separately isolated. Pulse Frequency: 500Hz maximum. Pulse Duration: 1ms if CAL0 = 2 (unscaled pulse output). If CAL0 = 1 (scaled pulse output) the duration of the pulse automatically adjusts to the output frequency:...

  • Page 24: Flowmeter Input

    20 Flowmeter Input 7. FLOWMETER INPUT The Model 103D 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 25 Flowmeter Input 21 +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 LINK 2 1.3V NPS (LINK 3) COIL (LINK 1) 100K 825R...
  • Page 26 22 Flowmeter Input 1. Squarewave, CMOS or Pulse Link Settings Switching threshold voltage is 1.3 volts. 2. Open Collector With 15A/150A internal pull up current Link Settings 3. Reed Switch - Battery Powered Link Settings With 15A internal pull up current eg.
  • Page 27 Flowmeter Input 23 4. Reed Switch - External DC Power Link Settings With 150A internal pull up current 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 28 24 Flowmeter Input 6. Namur Proximity Switch Link Settings 825R input impedance Note: Use this connection for a DC powered version of the Model 103D. MAN103D-V1.3...

  • Page 29: Installation

    Installation 25 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 30: Removing The Front Panel

    26 Installation 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 31 Installation 27 MAN103D-V1.3...

  • Page 32: The Main Electronics

    28 Installation 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 33: Wiring

    Installation 29 8.4 WIRING When connecting the 103D 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 34: 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 35: Index

    Index INDEX Model Number, 1 Accumulated Total, 2 Operating Alarm Outputs, 19 Temperature, 3 Operation, 2 CAL Sequences, 12 Cutoff Frequency, 12 Power, 18 Programming, 11 Pulse Output, 12 Decimal Point, 11, 12 Display, 2, 4 Disposal, 30 Rate, 2 Display Test, 5 Removing the Front Panel, 26 Resettable Total, 2...

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