series 290/3000 differential pressure transmitters user manual
Contents
1. WALL MOUNTING ELECTRONICS MODULE PG 9 BREATHER CABLE ELECTRONICS GLAND 80mm HOUSING max CABLE LENGTH 4 tapped BERO AS BEQUIRED Booted Cable TT fendi os r Su connections 2 O Y sensor 9 SENSOR 413 19 ENSO 75mm 9 ENSO 4mm 54mm Samm gt 75mm Samm 2 75mm _ k 83mm 4 MOUNTING HOLES ON 178 x 39mm 75mm MODEL 3675 MODEL 295 DETACHABLE WALL MOUNTING DIN PLUG ELECTRONICS MODULE INTERE Esta mmm CABLE BREATHER 7 ELECTRONICS GLAND mm 1 x 7 16 tapped son Se Q Booted Cable tehat PRESS Gdl connect fons 13 SENBOR 75mm 9 9 5 n 4mm Samm Samm 7 75mm I 15mm _ 383mm _4 4 MOUNTING HOLES ON 178 x39mm 75mm MODEL 3660 MODEL 292 I pe WALL MOUNTING ELECTRONICS MODULE Zen oo BREATHER CABLE ELECTRONICS LAND Bomm HOUSING na CASES 238mm 4 tapped LT 2 x4 BSP Boot eq Cable nani I I SENSOR 016mm SENSOR 016mm l BODY BODY E 4 TRANSMITTER INSTALLATION ELECTRICAL Electrical connections On remote models the signal and supply cable is connected to the terminal block via PG9 cable glands On integral models an industry standard DIN plug is used The cabling may be of screened flexible2. Connections X Non standard WS 2 Standpipe Wall 54 54mm centres for direct mounting 00 Loop powered 24 V DC Specify cable length in Metres models 290 292 295 only 42 4 to 20 mA output NO No options required SR Integral sq rt extraction HC Hastelloy wetted parts DI Integral digital indicator SD Integral Sq rt amp digital indicator 3 TRANSMITTER INSTALLATION MECHANICAL Pre installation checks The Transmitter will normally have been manufactured calibrated and tested in accordance with the users specific requirements It is recommended therefore that prior to commencing installation the specification of the instrument as supplied is checked to ensure that it is in accordance with actual installation requirements Checks should include nominal and actual ranges set signal output power supply requirements and process connections The relevant information will be engraved on the label located on the transmitter body Transmitter Mounting For integral units the transmitter may be either direct manifold mounted surface mounted or mounted on a standard 60mm instrument stand pipe using the optional mounting brackets For remote models the sensor itself is generally mounted directly to the pipework or 3 valve manifold the remote amplifier module is surface mounting only In either case care should be taken to ensure that the sensor is mounted level to within 2 degrees This especiall
3. Psi PSM INSTRUMENTATION LTD SERIES 290 3000 DIFFERENTIAL PRESSURE TRANSMITTERS USER MANUAL Models covered 3660 DP 3670 DP 3675 DP 290 DP 292 DP amp 295 DP Issue 2 date 10th J une 97 Burrell Road Industrial Estate Haywards Heath West Sussex RH16 1TW UK Tel 44 0 1444 410040 Fax 44 0 1444 410121 Http www psm sensor co uk E mail sales psm sensors co uk INDEX SECTION TITLE 1 Introduction 2 Specifications Model coding 3 Transmitter Installation Mechanical General arrangement Drawings 4 Transmitter Installation Electrical 5 Commissioning Range amp Zero adjustment 6 Fault Finding PAGE INTRODUCTION Series 3000 and 290 differential pressure transmitters are intended for applications across a wide range of processes from ultra low to medium pressure duties Different constructions and materials are available to suit a particular duty The measurement principle is based on a precision rated diaphragm and linear variable differential transformer LVDT combination On all models the pressure chamber houses a rated pressure element to which the process pressure is directly applied Backing plates are provided to protect against pressure overloads and full asymmetric protection is achieved on certain models by employing a hydraulically linked dual diaphragm assembly The pressure element is attached to a ferro magnetic core which is located in the centre null point of a hig
4. and is it of the correct order 5 Is the correct power supply applied to the transmitter and is it actually present at the transmitter terminals 6 Check the output from the transmitter at the receiving instrument 7 If all the foregoing are found to be in order then it will be necessary to isolate the instrument and remove it from process Check that no sludge or foreign matter has collected in the transmitter pressure chamber Any deposits can normally be seen clearly at the entrance to the pressure housing Do not use any tools or other pointed objects to clean inside the chamber this should only be done flushing with solvents suitable for use with nitrile rubber Should the problems persist consult PSM Service department on 01444 410040 or return to the factory for examination 12
5. dels Input ranges overload capabilities and arrangements see the following tables Differential Differential Differential 0 to 2 mb 0 to 2 mb 0 to 10 mb 0 to 50 mb Type Nominal range minimum Nominal range maximum 0 to 10 mb 0 to 10mb Maximum Static 10 bar 10 bar 50 bar Asymmetric Protection 5 bar 5 bar 20 bar Electronics Integral Remote Integral Intrinsic safety No Yes No Process connection 1 4 BSP 1 4 BSP 1 4 BSP Centres on 54mm Yes Yes Yes Duty Dry 5 5 Yes Duty Wet No No Yes Model coding 3675 DP 100mb cont 3660 DP Ultra Low Diff Pressure 3670 DP Low Diff Pressure 3675 DP Differential Pressure 290 DP As 3670 but remote IS Transmitter set range S Special calibration 2mb Nominal range 2 mbar 5mb Nominal range 5 mbar 10mb Nominal range 10 mbar 20mb nominal range 20 mbar 50mb Nominal range 50 mbar 100mb Nominal range 100 mbar 200mb Nominal range 200 mbar 500mb Nominal range 500 mbar 1b Nominal range 1 bar 2b Nominal range 2 bar 5b Nominal range 5 bar 10b Nominal range 10 bar 20b Nominal range 20 bar 3675 DP Differential Differential Differential 0 to 10 mb 0 to 50 mb 0 to 50 mb 0 to 50 mb 0 to 1 bar 0 to 1 bar 50 bar 50 bar 50 bar 20 bar 20 bar 20 bar Remote Integral Remote Yes No Yes 1 4 BSP 1 4 BSP 1 4 BSP 75mb 42 54 XX SR 00 WS OX Degreased NB No Bracket direct manifold mounting Process
6. h resolution linear variable differential transformer LVDT When voltage is applied to the primary coil any movement of the core due to pressure on the measuring element develops a voltage in the two secondary coils The output signal from these two coils is then conditioned within the transmitter electronics to provide a standard process control signal output which using the adjustments provided may be set by the user to the process requirements SPECIFICATIONS General Mechanical Electronics Housing Integral models Stainless steel to IP65 Remote models GRP with internal RFI screen to IP65 Pressure housing 316 St Stl Diaphragm material Hastelloy C St Stl model dependant Remote sensor cable Heavy duty TPE max length 100 metres Process connections 1 4 BSPT Fem on 54 mm centres Electrical connections Integral models Standard DIN type connector Remote models PG9 Cable glands Electrical Maximum error 0 25 including the effects of non linearity and hysteresis Range adjustment 30 to 100 of nominal input range Zero adjustment 20 of nominal input range Signal output 4 to 20 mA dc 2 wire Power supply 12 to 30 V de Performance Operating temperature 25 to 80 deg C 100 deg C remote Temperature effect Better than 0 05 per deg C Humidity 0 95 deg C RH non condensing Optional remote versions only Square root extraction non IS versions only 3 digit LCD Indicator 0 to 100 For Mo
7. ital indicator is performed using these controls With zero pressure applied the left hand potentiometer should be adjusted until the display reads zero and when full scale pressure is applied the right hand potentiometer should be adjusted until the meter reads as required Placement of the decimal point may be altered using DIL switches marked 1 and 2 as follows With both off max full scale value is 1999 With DIL sw 2 on max full scale value is 199 9 With DIL sw 1 on max full scale value is 19 99 11 6 FAULT FINDING Routine Maintenance The design of these transmitters is such that no routine maintenance is required except for periodic examination of gaskets and security of pressure and electrical connections Fault Finding These transmitters are sensitive and accurate measuring instruments and have no mechanical wearing or contacting parts If installation procedures have been followed correctly the instrument should give satisfactory operation over a long period In cases of failure or poor operation following installation or in normal service the following check list may assist in isolating the cause of any problems 1 Are the range details of the transmitter correct for the duty 2 Fully check impulse piping and wiring installation have any leaks developed or are there any poor electrical connections 3 Is the transmitter isolation valve if fitted fully in the open position 4 Is there pressure in the process
8. or mineral insulated type dependant upon the application requirements maximum conductor size 1 5mm Prior to connection of any power supply it should be ensured that the voltage is correct for the transmitter otherwise damage may result Where other devices are to be included in the signal loop for 2 wire 4 to 20mA output transmitters the total loop impedance may not exceed the figure given by the following equation Supply Voltage 12 Maximum output load eee Remote Models Sensor Connection D to 30 GREEN Ground Integral Models Loosen securing screw A and remove plug i It is recommended that screened cable is used and that the screen is connected to the ground terminal Terminal block may be removed from the housing positive by carefully levering it out using the slots provided 10 5 TRANSMITTER COMMISSIONING Under normal circumstances the instrument will have been supplied with range and zero controls preset according to the users specifications therefore no adjustment should be necessary However it may be when the transmitter is installed trimming of zero and or range settings are necessary It may also be that the transmitter is to be reset for a different application On integral models access to the zero and span adjustment potentiometers is provided by undoing the plastic locking ring at the rear of the body On remote model
9. s the zero and span adjustments are located on the lower PCB and accessed vis 2 holes in the upper PCB In both cases the potentiometers are clearly identified Where practical all adjustments should be made with the transmitter installed on the process and the range and zero settings validated by measurement of the output signal at 0 and 100 of the process pressure Where it is not practical to vary the process pressure to suit an alternative pressure source may be employed this should be an high accuracy device such as an air driven dead weight tester laboratory digital pressure standard water or mercury column Range amp Zero adjustments The zero should be adjusted firstly the instrument is of the live zero type therefore for when no pressure is applied the output signal should be 4 00mA Once this is achieved the range potentiometer should be adjusted with the required max pressure applied to the instrument until the output signal is 20mA It is recommended that the zero be rechecked after range adjustment Display scaling Remote models optional digital indicator Note DIL Sw 1 amp DIL Sw 2 should not be in the on position at the same time Display scaling should be performed after any range and zero adjustments are made Where the optional 312 digit display is fitted an additional board is housed in the amplifier module Two DIL switches 1 amp 2 plus a zero and a range potentiometer are included scaling of the dig
10. y important for very low range models Unless otherwise stated all transmitters are calibrated in the level position System Piping The size of the process connection to the pressure chamber will depend on what was specified at the time of manufacture The plastic protection plug where fitted should be removed Do not overtighten the pressure connection or insert any objects through the entry hole since this may result in damage to the sensitive pressure element In general it should be ensured that the pipework and valves used are compatible with the process in terms of materials and pressure ratings For liquid level duties long pipe runs should have a gradient to assist in clearance and line size should be 1y minimum Where isolation valves are fitted they should be as close to the transmitter as practical ideally the transmitter should be directly mounted to a 3 or 5 valve manifold For wet applications to ensure that there is no air trapped in the system it will be necessary to purge bleed the sensor using the bleed screws provided On D P applications the pressure should first be equalised This is especially important on very low range units where asymmetric protection is limited GENERAL OUTLINE DRAWINGS 4 MOUNTING HOLES ON 178 x39mm MODEL 3670 MODEL 290 SS I
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