Installation Manual: PXT Series Pressure Transmitters
Contents
1. originally empty To avoid damaging surges fluid line should remain full if possible pumps should be brought up to power slowly and valves operated slowly To avoid damage from both fluid hammer and surges a surge chamber should be installed and a pressure snubber such as Murphy PD 8100 Series adjustable or PM6203 Series fixed call Murphy for details should be installed on every transmitter transducer Symptoms of fluid hammer and surges damaging effects a Pressure transmitter exhibits an output at zero pressure large zero offset b Pressure transmitter output remains constant regardless of pressure c In severe cases there will be no output Noise For minimum noise susceptibility avoid running the transmitters transduc ers cable in a conduit that contams high current AC power cables or igni tion loom on engine Where possible avoid running the cable near induc tive equipment Shielded cable is always recommended Earth the shield at one end only Mounting CAUTION THESE ARE PRECISION INSTRUMENTS DO NOT INSTALL IN ANY MANNER THAT CAN CAUSE SIDE STRESS OR IS SUBJECT TO EXCESSIVE VIBRATION Hold when attaching to pressure source Do NOT twist body The transmitter transducer requires no special mounting hardware and can be mounted in any plane with negligible position error Although the unit can withstand substantial vibration without damage or significant output effects it is always good practice to mount th2. 00 02 eas PXT Series Pressure Transmitters E Installation Instructions Please read the following information before installing MURPHY gt A visual inspection of this product for damage during shipping is recommended before mounting i eer PRR G Mh feck bey om ee This Murphy instrument is susceptible to damage when exposed to and Div I Grps A B C D with a Barrier static electrical charges To avoid damage observe the following VY Ground transmitter body before making electrical connections RFI Protection To the European standards of BS EN 50082 2 1991 in accordance with IEC 801 parts 1 to 6 for suspectibility to EMC and to BS EN 50081 1992 for emissions ya Voltage Surge Spike Protected against a 600 V spike to IEC 60 2 Reverse VY Make sure the machine cannot operate during installation polarity protected V Follow all safety warnings of the machine manufacturer Sealed Sealed at one atmosphere at sea level for ranges gt 1000 psi 6 89 v Read and follow all installation instructions MPa 68 Bar Vented Vented for ranges lt 1000 psi 6 89 MPa 68 Bar Laboratory Approvals UL CUL Class Div 1 Groups A B C D Class II VY When disconnecting remove ground connection last v Disconnect all electrical power to the machine Description Division Groups E F G when installed with approved barrier per draw The PXT Series pressure transmitters are state of the art instruments providin
3. ETERS TERMINALS VMAX IMAX Cl LI 0 11 uF POS NEG 28V 93mA i Vmax gt Voc max gt Isc Ci C cable lt Ca i E Li L cable lt La USE THE FOLLOWING PARAMETERS IF CABLE PARAMETERS ARE UNKNOWN CABLE CAPACITANCE 60 pF ft EX Cable 1000ft x 60pF ft 0 06 uF CABLE INDUCTANCE 0 2 uH ft EX L Cable 1000ft x 0 2 wH ft 0 2mH l ALL INTRINSICALLY SAFE WIRING SHALL BE KEPT SEPARATE FROM NON INTRINSICALLY SAFE WIRING REFER TO ARTICLE 504 OF THE NATIONAL ELECTRICAL CODE OR THE CANADIAN ELECTRICAL CODE EARTH GND FW MURPHY PO Box 470248 Tulsa Oklahoma 74147 USA Phone 1 918 317 4100 Fax 1 918 317 4266 E mail sales fwmurphy com INDUSTRIAL PANEL DIVISION Fax 1 918 317 4124 E mail ipdsales fwmurphy com MURPHY POWER IGNITION Web site www murphy pi com CONTROL SYSTEMS amp SERVICES DIVISION PO Box 1819 Rosenberg Texas 77471 USA E mail E Phone 1 281 633 4500 Fax 1 281 633 4588 AN E mail css solutions fwmurphy com at d y FA N USA IS0 9001 2008 FM 28221 866 A F ions SAFE AREA POWER BARRIER Voc 28 V Isc 93 mA Ca 0 12 uF La 3 mH V SUPPLY EX L CONTROL EQUIPMENT MUST NOT BE CONNECTED TO EQUIPMENT WHICH USES OR GENERATES MORE THAN Q 250 VRMS WITH RESPECT TO EARTH GROUND POWER RETURN BARRIER NOTES 1 OUTPUT CURRENT M
4. Time Frequency response better than 2 kHz 1000 0 1 000 psi 6 89 MPa 68 9 Bar Storage Temperature 65 to 200 F 54 to 93 C 2000 0 2 000 psi 13 79 MPa 137 8 Bar Operating Temperature 40 to 180 F 40 to S2 C 3000 0 3 000 pai 20 69 MPa 200 7 Bar i o o 5000 0 5 000 psi 34 48 MPa 344 5 Bar Compensated Temperature 20 to 160 F 29 to 71 C 6000 0 6000 psi 4137MPa 4134 Bar Total Thermal Effects Over Compensated Ranges 2 FS TEB oh Physi cal T NOTE Conversions are approximate Enclosure Weather Resistant Loop Resistance Graph Body 346 stainless steel Meets NACE MROI 75 a Wetted MADIG stainless steel or HASTELLOY C276 Supply voltage for the PXT must be within range of 9 30 VDC The Graph below ProcessConnection 1 4 NPT female shows the minimum supply voltage VDC required for a given load resistance RL Electrical Cable Integral 60 in 914 mm vented T 2 in NPT male conduit connection Environmental Effect Humidity No effect Mounting Position orientation has negligible effect Reverse polarity protected Shock 1000g Ims Half sine Pulse in each of 3 mutually perpendicular axis will not affect performance Vibration Effect on output response is less than 0 05 FS g at 30g Peak 10Hz to 2kHz limited by 0 05 in double amplitude MIL STD 810C Proc 514 2 2 curve L PXT Power Requirements Typically 24 VDC is required using the Loop 1500 Total Load Resistance RL OHMS Resis
5. UST BE LIMITED BY A RESISTOR SUCH THAT THE OUTPUT VOLTAGE Vs CURRENT PLOT IS A STRAIGHT LINE BETWEEN Voc AND Isc 2 BARRIER MUST BE INSTALLED AS INSTRUCTED BY THE MANUFACTURER 3 SELECTED BARRIER INTRINSICALLY SAFE CIRCUITS SHALL BE APPROVED FOR CLASS I Il III DIV 1 amp 2 GROUPS A G 4 TERMINATE BARRIER EARTH GROUND TO THE GROUND BUS OF THE POWER DISTRIBUTION PANEL RESISTANCE TO GROUND MUST NOT BE GREATER THAN 1 OHM FRANK W MURPHY LTD Church Road Laverstock Salisbury SP1 1QZ UK Phone 44 1722 410055 Fax 44 1722 410088 sales fwmurphy co uk Web site www fwmurphy co uk FW MURPHY INSTRUMENTS HANGZHOU CO LTD 77 23rd Street Hangzhou Economic amp Technological Development Area Hangzhou Zhejiang 310018 China Phone 86 571 8788 6060 Fax 86 571 8684 8878 E mail apsales fwmurphy com A A UK ISO 9001 2008 FM 2942 w S Registered Facilities A CHINA ISO 9001 2008 FM 523851 WARNING READ BEFORE INSTALLATION Fluid hammer and surges can destroy any pressure transmitter transducer and must always be avoided A pressure snubber should be installed to eliminate the damaging hammer effects Fluid hammer occurs when a liquid flow is suddenly stopped as with quick closing solenoid valves Surges occur when flow is suddenly begun as when a pump is turned on at full power or a valve is quickly opened Liquid surges are particularly damaging to pressure transmitter trans ducer if the pipe is
6. YELLOW N A WHITE WHITE Installation 00 02 0475 Installation Manual 00 02 0840 Instructions Installation Diagram 05 08 0754 Installation Diagram 05 08 0763 No step down between the body and the hex coupling No indentations on the hex coupling had 4 ra T gt i 3 n uP ys C e T LUG d An
7. e transmitter where there is minimum vibration Apply Teflon tape sealant to the pressure fittings threads before installing When tightening apply a wrench to the hex wrench flats located just above the pressure fitting DO NOT tighten by using a pipe wrench on the housing COMPUTRONIC CONTROLS 41 46 Railway Terrace Nechells Birmingham B7 SNG UK E mail sales computroniccontrols com Web site www computroniccontrols com ISO 9001 REGISTERED FIRM Certificate No GB2000671 Registration No 0044 1 INTERNATIONAL ACCREDITATION BOARD www fwmurphy com 05 05 2011 00 02 0475 ADDENDUM Revised 2012 05 04 Section 05 PXT and PXT K Series Pressure Transmitter Cabling Identification The PXT Series Pressure Transmitters have been changed Previous pressure transmitters in this series were identified as PXT Pressure Transmitters The newest version is the PXT K Series Pressure Transmitters Identification of electrical cable color is NOT interchangeable between the two series of pressure transmitters This document contains information to assist you in identifying the pressure transmitter unit you have and the correct electrical cable colors to avoid wiring mistakes PXT SERIES PXT K SERIES RPH AN pxt 100 im Indentations on the hex coupling for gt r controlled locking m Product has a step down between the transmitter A oe body and hex coupling POWER ORANGE YELLOW N A ORANGE
8. g 4 to ing 05 08 0754 UL cUL Class I Div 2 Groups A B C D Class II 20 mA outputs They feature a precision micro machined silicon diaphragm with Groups E F G non incendive per drawing 05 08 0754 fully welded stainless steel pressure port for greater accuracy stability and a wide i range of compatibility All wetted parts are 316L stainless steel or Hasteloy C276 Ranges Available Specifications rea S 9 pectijy OF tnts range Accuracy Full Scale Best Straight Line 0 25 including non linearity 30V30WG 30 H20 to 30 H20 76 cm H20 to 76 cm H20 0 075 Bar hysteresis and repeatability Long term stability better than 0 2 FS over 3030 30 He to 30 psie 76 cm He to 207 kPa 2 07 B twelve 12 months 30 Hg to 30 psig 76 cm Hg to od l 30V100 30 Hg to 100 psig 76 cm Hg to 689 kPa 6 89 Bar Zero Setting 5 of full scale 0 25 typical 15 0 15 psi 103 4 kPa 1 03 Bar Span Setting 0 5 of full scale BSL RSS 60 0 60 psi 413 7 kPa 4 13 Bar Overpressure Proof Pressure 400 for up to 500 psi 3 45 MPa 100 0 100 psi 689 kPa 6 89 Bar 34 Bar 200 for higher ranges 200 0 200 psi 1 38 kPa 13 78 Bar Burst Pressure 300 0 300 psi 2 07 kPa 20 67 Bar Ranges 0 1000 psi 600 of full scale or 4000 psi whichever is lower 400 0 400 psi 2 75 MPa 27 56 Bar Ranges 2000 psi 13 79 MPa 137 Bar 20 000 psi 27 5 MPa 275 Bar 600 0 600 psi 4 14 kPa 41 34 Bar Response
9. tance Graph 9 30 VDC ET PXT Series Transmitter Output 4 20 mA 2 wire 250 ohm Insulation Greater than 10 Mohms 500 VDC Power Supply Voltage VDC NOTE Cable resistance effect included in RL Installation 00 02 0475 page 1 of 2 PXT Series Dimensions Low Pressure Units 00 ae 2 in 2 30 in ala Sdi 60 in 1524 mm A long cable std 1 18 in Did 30mm e i 1 2 NPTM 316 Stainless wate sls HGX Steel Housing 866 A F High Pressure Units 86 in 2 08 in 2 30 in 22 mm G a S 60 in 1524 mm long cable std 1 18 in Dia 30 mm 1 4 NPTF 316 Stainless 1 2 NPTM Steel Housing PXT Series Electrical Connect CAUTION Hookup Cable is not serviceable DO NOT unscrew cap nut RED CABLE Power BLUE CABLE Power Orange Yellow White amp Shield No Connection For more information about cable colors and identifying the PAT Series Pressure Transmitter see page 3 of this document INSTALLATION DIAGRAM HAZARDOUS AREA 1 INSTALLATION INSTRUCTIONS FOR CLASS I DIV 2 UNITS MEET CLASS DIV 2 WHEN INSTALLED IN ACCORDANCE WITH CLASS DIV 2 METHODS EITHER BY USING THE CONDUIT AND GROUND CONNECTION PROVIDED OR BY INSTALLING IN A SUITABLE ENCLOSURE ACCEPTABLE TO THE LOCAL AUTHORITY 1 HAVING JURISDICTION INSTALLATION INSTRUCTIONS FOR CLASS DIV 1 f Class Groups A B C D Class Il Groups E F G PXT SERIES o l TRANSMITTER ENTITY PARAM
Download Pdf Manuals
Related Search