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Summary of Contents for Contrec 104A
- Page 1 FIELD MOUNTED RATE TOTALISER MODEL 104A 11 October 2013 104A-M-V1...
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Page 3: Table Of Contents
CONTENTS 1. Introduction 1.1 Model Number Versions 1.2 Intrinsic Safety Approvals 1.3 Operation 2. Specification 3. Programming 3.1 Program Steps 3.2 Calculation of Rate and Total 3.3 Total Conversion 3.4 Filtering 3.5 Example 4. Signal Input 5. Alarm & Pulse Outputs 6. -
Page 5: Introduction
The instrument is powered from a 4-20mA input signal and therefore, requires no external power. The Model 104A Rate Totaliser conforms to the EMC-Directive of the Council of European Communities 89/336/EEC and the following standards: Generic Emission Standard EN 50081-1 Residential, Commercial &... -
Page 6: Model Number Versions
Introduction 1.1 MODEL NUMBER VERSIONS The Model Number describes the options available for the 104A as follows: Model 104A . x where x denotes the mounting options and will be replaced by one of the following numbers: 0 No holes drilled for cable entry... - Page 7 Introduction The Model 104A...
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Page 8: 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 104A shuts down saving totals in the non-volatile memory. -
Page 9: Specification
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 Accumulated Total button is pressed. Rate/Display: 5 digits with 8.5mm (0.33") high digits. Span: The units of measure per timebase (eg. - Page 10 Sealed to Nema 4x or IP67 standards. Cable Entry: By cable glands. Wall Mounting: Universal Mounting Bracket supplied as standard. Pipe Mounting: A galvanised metal bracket is available which enables the Model 104A to be attached to a 2" vertical or horizontal pipe.
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Page 11: Programming
Programming 3. PROGRAMMING The Model 104A 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 (ie. the dark grey strip along the bottom of the enclosure) and replacing it the wrong side up. -
Page 12: Program Steps
Programming 3.1 PROGRAM STEPS Step Comment CAL 00 Pulse Output. 0 = No pulse output, low and high alarms 1 = Scaled pulse output and low alarm CAL 01 Span - whole numbers. CAL 02 Span - digits after the decimal point. The Span is the number of units of measure per timebase (eg. - Page 13 Programming Step Comment CAL 06 Filter. Fluctuations in the flowrate can be filtered out so that the Rate is held steady. The filter value is programmed between 1 - 99 where "1" represents no filtering and is maximum. See section 3.4. CAL 07 Decimal Point for Total Display.
- Page 14 Programming Step Comment CAL 11 Low Alarm - digits after the decimal point. CAL 10 & 11 program the flowrate below which the low alarm relay will close. The value can be programmed in the range 0 to 999,999. CAL 12 High Alarm or Pulse Output Factor - whole numbers.
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Page 15: Calculation Of Rate And Total
Programming 3.2 CALCULATION OF RATE AND TOTAL 3.2.1 Analog Input The flowrate, R, is calculated as follows: R = SA if the linear relationship is selected if a square law relationship is selected R = S where A = the input value S = the span At the minimum input (ie. - Page 16 Programming 3.2.2 The Cutoff Point Because many transducers do not always exactly transmit 4mA when they are at zero rate, it is often necessary to define a rate below which no integration takes place. This is termed the cutoff point and is programmed as a percentage of the Span, S.
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Page 17: Total Conversion
Programming 3.3 TOTAL CONVERSION The Total Conversion feature enables the rate to be displayed in one engineering unit (eg. gallons/minute) and the totals to be displayed in another engineering unit (eg. barrels). The Span is always programmed in the unit relating to Rate, and the Total Conversion constant is a division factor which can be used to convert the totals to the different unit. -
Page 18: Filtering
Frequency fluctuations caused by pulsating flow through a flowmeter, often makes the Rate impossible to read with any precision. The Model 104A 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 19 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.
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Page 20: Example
Programming 3.5 EXAMPLE A vortex flowmeter has a maximum output of 20.538 litres/min at 20mA. It is required to display the flowrate in litres/min with 1 decimal point and the total in litres with no decimals. High and low alarms are required at 18 l/m and 2 l/m respectively. -
Page 21: Signal Input
Signal Input 4. SIGNAL INPUT The signal input is on terminals 3 and 4 and can be connected as follows:... -
Page 22: Alarm & Pulse Outputs
Alarm & Pulse Outputs 5. ALARM & PULSE OUTPUTS Open collector outputs are provided for high and low flowrate alarms. The output can sink up to 200mA and can be used to power external relays, lights or audible alarms. The outputs are internally protected against voltage spikes caused by relays and coils. - Page 23 Alarm & Pulse Outputs Connections...
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Page 24: Installation
Installation 6. INSTALLATION 6.1 WALL MOUNTING A wall mounting bracket is supplied with each instrument. The bracket should be attached to the wall using round head screws (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). -
Page 25: Removing The Front Panel
Installation 6.2 REMOVING THE FRONT PANEL The front of the instrument is removed as follows: 1. Remove both the top and bottom cover strips (ie. the dark plastic strips on the front) by levering a screwdriver under one end. 2. Undo the seven screws retaining the front. Note that the screws should not be removed from the front panel as they are retained by O-rings. - Page 26 Installation...
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Page 27: The Main Electronics
Installation 6.3 THE MAIN ELECTRONICS The front section of the housing contains the microprocessor and display. It is also possible to adjust the display contrast via a small potentiometer on the board. The DISPLAY CONTRAST control is shown below and this can be adjusted for optimum contrast. -
Page 28: Wiring
EMC-Directive 89/336/EEC of the Council of the European Community, this wiring practice is mandatory. 6.5 MAINTENANCE All printed circuit boards must be repaired by Contrec Manufacturing Ltd. In the case of a fault, no attempt should be made to repair the board. -
Page 29: Terminal Designations
Installation 6.6 TERMINAL DESIGNATIONS 4-20mA Input 4-20mA (-) 4-20mA (+) Outputs Low Alarm (-) Low Alarm (+) High Alarm (-) or Pulse Output (-) High Alarm (+) or Pulse Output (+) -
Page 30: Index
Index Index Programming, 10 Protection, 9 Pulsating Signal, 17 Pulse Output, 21 Accumulated Total, 8 Rate, 7 CAL Sequences, 11 Removing the Front Cutoff Point, 15 Panel, 27 Resettable Total, 7 Response, 17 Decimal Point, 10 Display, 7 Display Test, 7 Span, 14 Specification, 8 Filtering, 17...
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