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202A-M-V3.1

FIELD MOUNTED

RATE TOTALISER

MODEL 202A

June 2017

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Summary of Contents for 202A

Page 1: ...202A M V3 1 FIELD MOUNTED RATE TOTALISER MODEL 202A June 2017 ...

Page 2: ...202A M V3 1 ...

Page 3: ...11 3 2 Calculation of Rate and Total 14 3 3 Total Conversion 16 3 4 Filtering 17 3 5 Example 19 4 Signal Input 20 5 Alarm Pulse Outputs 21 6 Intrinsic Safety Connections 23 7 Installation 25 7 1 Wall Mounting 25 7 2 Panel Mount Version 26 7 3 Removing the Front Panel 27 7 4 The Main Electronics 29 7 5 Wiring 30 7 6 Maintenance 30 7 7 Terminal Designations 31 Index 32 ...

Page 4: ...202A M V3 1 ...

Page 5: ...n constants set via the front panel switches and stored in a non volatile memory which will retain data indefinitely The user can program span filtering levels display resolution and cutoff point The instrument is powered from a 4 20mA input signal and therefore requires no external power The Model 202Ai Rate Totaliser conforms to the EMC Directive of the Council of European Communities 2004 30 EU...

Page 6: ...x denotes the mounting options and will be replaced by one of the following numbers 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 C CSA USA Canada Approval M ATEX IECEx Approval ...

Page 7: ...202A M V3 1 Introduction 5 The Model 202A ...

Page 8: ...ure Maximum ambient temperature of 60 C CSA US C Approval LR 104 840 5 Type Class 1 Groups C and D When installing in hazardous areas the instrument must be installed according to the guidelines in Section 2 and in accordance with the local relevant standards for wiring and installation in hazardous areas 4 20mA Input The input can be connected to IS circuits with the following maximum values Ui 2...

Page 9: ... follows Lo Test By pressing the ACCUM TOTAL key the low alarm output will go low Hi Test By pressing the RESET key the high alarm output a will go low if CAL00 0 high alarm output b will output 100ms pulses every 0 5sec if CAL00 1 scaled pulse output Display Test By pressing the PROGRAM key all segments of the display will show To exit the test mode simultaneously press all three front panel keys...

Page 10: ...3 high digits Span The units of measure per timebase eg gallons sec is programmable in the range 0 000001 to 999 999 Decimal Points Decimal Point positions are fully programmable for both rate and total Timebase Span can be programmed in units per second minute hour or day 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 temperat...

Page 11: ...z b 10ms if output frequency is 5 50Hz c 100ms if output frequency is 5Hz Physical Temperature Operating Temperature 20 C to 60 C Dimensions 97mm 3 8 high x 150mm 5 9 wide x 41mm 1 6 deep cable glands not included Protection 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 avail...

Page 12: ...t panel are used to change and increment the flashing digits The CAL number is displayed on the lower display and the parameter is displayed on the upper display Parameters in Program Mode that consist of the two parts whole numbers and digits after the decimal point are restricted to having a maximum of 6 significant digits Therefore the number of significant digits entered in the whole numbers d...

Page 13: ...f measure per timebase e g litres sec Gal min The Span can be programmed in the range of 0 000001 999 999 See section 3 2 CAL 03 Cutoff Point This determines the cutoff point as a fraction of Span See section 3 2 2 CAL 04 Decimal Point for Rate Display 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 ho...

Page 14: ...tals can be displayed with 0 1 2 or 3 decimal points CAL 08 Total Conversion Factor whole numbers CAL 09 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 Set to 1 000 if t...

Page 15: ...ctor digits after the decimal point CAL 12 13 program the flowrate above which the high alarm relay will close The value can be programmed in the range 0 to 999 999 If the pulse output is selected see CAL 00 the value will represent the total per pulse eg 5 litres per pulse CAL 14 Input Flow Relationship 0 Linear Input 1 Square Root Input CAL 15 Accumulated Total Reset CAL 15 displays the accumula...

Page 16: ...p is selected where A the input value S the span At the minimum input i e 4mA A 0 and at the maximum input ie 20mA A 1 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 A ...

Page 17: ...s termed the cutoff point and is programmed as a percent age of the Span S For example if S 2200 kg min in a square law system and the cutoff point is set at 20 0 the actual cutoff rate Rc can be determined as follows The cutoff rate is defined as At 20 cutoff Rc 2200 x 0 2 440 kg min The value of A which would produce this cutoff is A 0 04 and the input signal would be I 16mA x 0 04 4mA 4 64mA A ...

Page 18: ...and accumulated totals For Example If the Rate is required in gallons per minute 1 The Span would be programmed as gallons per minute 2 The timebase would be programmed as minutes If the Totals are required in barrels 3 The Total Conversion factor is programmed as 42 there are 42 gallons in a barrel All totals will now totalise in barrels Some common units are given below together with the Total C...

Page 19: ...a suitable filtering level means that highly accurate and stable readings can be obtained without excessive lag The diagram below shows a pulsating signal input together with the effect of filtering As a guideline to the degree of filtering to be used the following table shows the response to a step change in input The value CAL 06 is the filter constant which is programmed during the Programming ...

Page 20: ...9 1 0 0 2 1 2 4 2 4 6 3 6 10 5 11 15 8 17 20 11 22 25 14 28 35 20 40 45 25 51 60 34 69 75 43 86 90 52 103 99 57 113 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 ...

Page 21: ...s then programmed as follows CAL00 0 No Pulse Output CAL01 00020 Span Whole Numbers CAL02 5380 Span Decimals CAL03 0 05 Cutoff Point as a fraction of Span CAL04 1 Rate decimal position CAL05 1 Timebase CAL06 01 Filter disabled CAL07 0 Total decimal position CAL08 0001 Total Conversion set to 1 0000 CAL09 0000 Total Conversion decimals CAL10 00002 Low Alarm CAL11 0000 Low Alarm CAL12 00018 High Ala...

Page 22: ...202A M V3 1 20 Signal Input 4 SIGNAL INPUT The signal input is on terminals 3 and 4 and can be connected as follows ...

Page 23: ...the low flow alarm will switch on whenever the flowrate drops below the programmed flowrate Similarly the high alarm switches on whenever the flow exceeds the high setpoint 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 The duration of pulses is adjusted auto...

Page 24: ...202A M V3 1 22 Alarm Pulse Outputs Connections ...

Page 25: ...n 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 Ii 93mA Pi 653mW The internal capacitance seen on the input terminals 3 4 is 0 02uF while the internal capacitance seen on the output terminals 5 8 is 0 1uF maximum Inductance is negligibly small on...

Page 26: ...rrier Ro 300 ohm I S Barrier Ro 300 ohm 8 6 4 7 5 3 MODEL 202A RATE TOTALISER Approved 4 20mA Current Loop Transmitter HAZARDOUS AREA SAFE AREA SAFE AREA I S Barrier Uo 28V maximum Io 93 mA maximum Po 653 mW maximum I S Barrier Uo 28V maximum Io 93 mA maximum Po 653 mW maximum Intrinsically Safe installation ...

Page 27: ... 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 28: ...unt 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 ...

Page 29: ... 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 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 ...

Page 30: ...202A M V3 1 28 Installation ...

Page 31: ...ia a small potentiometer on the board The DISPLAY CONTRAST control 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 and calibration parameters to default values The Main Electronics Display Contrast RESET CONTREC SYSTEMS ...

Page 32: ...l 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 SPECIAL CONDITIONS FOR SAFE USE To comply with this products ATEX IECEx certification the special conditions for safe use must be followed The Instrument type 202Ai shall be mo...

Page 33: ...202A M V3 1 Installation 31 7 7 TERMINAL DESIGNATIONS 4 20mA Input 3 4 20mA 4 4 20mA Outputs 5 Low Alarm 6 Low Alarm 7 High Alarm or Pulse Output 8 High Alarm or Pulse Output ...

Page 34: ...on 25 Intrinsic Safety 7 L Lo Test 6 Low Alarm 12 M Model Number 4 O Operating Temperature 9 Operation 6 P Panel Mount 26 Programming 10 Protection 9 Pulsating Signal 17 Pulse Output 21 R Rate 6 Removing the Front Panel 27 Resettable Total 6 Response 18 S Span 11 Specification 8 T Temperature 9 Terminal Designations 31 Test Mode 6 Timebase 11 Total Conversion 16 W Wall Mounting 25 ...

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