© Siemens AG 2015 Pressure Measurement Transmitters for basic requirements 1 SITRANS P250 for differential pressure Mode of operation ■ Overview p1 p2 U const. U I I0, UB SITRANS P250 pressure transmitter, function diagram The piezo-resistive measuring cell (ceramic membrane) has a Wheatstone bridge circuit, on which the operating pressure P1 and P2 of the media acts at both ends. The voltage output from the measuring cell is converted by an amplifier into an output current of 4 to 20 mA or an output voltage of 0 to 5 or 10 V DC. The SITRANS P250 transmitter measures the differential pressure of liquids and gases. ■ Benefits ■ Technical specifications • • • • High measuring accuracy Sturdy stainless steel enclosure For aggressive and non-aggressive media For the measurement of the differential pressure of liquids and gases • Temperature-compensated measuring cell • Compact design ■ Application The SITRANS P250 transmitter for differential pressure is primarily used in the following industries: • Chemical industry • Heating, ventilation and air conditioning technology • Food industry • Mechanical engineering • Shipbuilding • Water supply ■ Design Main components: • Stainless steel enclosure with piezo-resistive ceramic measuring cell (temperature-compensated) and electronics module • Process connection made of stainless steel in diverse designs (see Selection and Ordering data) • Electrical connection through connectors acc. to EN 175301-803-A and round connectors M12, as well as with permanently fixed cable ■ Function SITRANS P250 differential pressure transmitter Application Differential pressure transmitter Liquids and neutral gases Mode of operation Measuring principle Piezo-resistive measuring cell (ceramic diaphragm) Input Measured variable Differential pressure Measuring range 0 ... 0.1 to 0 ... 25 bar (0 ... 1.45 to 0 ... 363 psi) Operating pressure 25 bar at a differential pressure range > 6 bar 50 bar at a differential pressure range > 10 bar Burst pressure 1.5 x operating pressure Output Output signal • Current output signal 4 ... 20 mA • Voltage output signal 0 ... 5 V DC and 0 ... 10 V DC Load • 3-wire > 10 k • 2-wire (UH - 11 V) / 0.02 A Measuring accuracy Error in measurement at limit setting incl. hysteresis and reproducibility 1 % of typical full-scale value, see "Measuring range" table" Long-term stability acc. to IEC 60770 0.5 % of full-scale value/year Influence of ambient temperature The pressure transmitter measures the differential pressure of liquids and gases. 1/22 The output current and voltage are linearly proportional to the input pressure. Siemens FI 01 · 2015 US Edition • Start of scale 0.6 % / 10 K of full-scale value ( 1.2 % / 10K for measuring cell 0 ... 0.1 bar (1.45 psi)) • Full-scale value 0.22 % /10 K of full-scale value ( 0.37 % / 10K for measuring cell 0 ... 0.1 bar (1.45 psi)) Dynamic behavior Suitable for static and dynamic measurements Step response time T99 < 5 ms Load variation < 50 Hz © Siemens AG 2015 Pressure Measurement Transmitters for basic requirements SITRANS P250 for differential pressure Rated conditions Measuring range Ambient conditions • Temperature of medium -15 ...+85 °C (5 ... 185 °F) • Ambient temperature -15 ...+85 °C (5 ... 185 °F) • Storage temperature -40 ...+85 °C (-40 ... +185 °F) Degree of protection acc. to EN 60529 IP65 Mounting position Any Mounting Mounting bracket, included in delivery Design Weight Approx. 430 g (approx. 0.95 lb) Enclosure material Stainless steel 1.4305/AISI 303 Electrical connection • Plug EN 175301-803-A • Circular plug EN 60130-9 • Cable 1.5 m Process connection • Hose sleeve Ø 4 mm/6 mm • Pipe union Ø 6 mm/8 mm • Male thread 7/16-20 UNF, G1/8" • Female thread 1/8-27 NPT • (Standard), G1/8" Max. Burst perm. oper- pressure ating pressure (on either side) Max. perm. operating pressure (on one side) Accuracy [bar] [inH2O] 0 ... 0.1 0 ... 40.18 25 bar (363 psi) 37.5 bar (544 psi) 0.6 bar (241 inH2O) 1.0 % 0 ... 0.2 0 ... 80.37 25 bar (363 psi) 37.5 bar (544 psi) 0.6 bar (241 inH2O) 0.8 % 0 ... 0.25 0 ... 100.46 25 bar (363 psi) 37.5 bar (544 psi) 0.6 bar (241 inH2O) 0.5 % 0 ... 0.3 0 ... 120.56 25 bar (363 psi) 37.5 bar (544 psi) 0.6 bar (241 inH2O) 0.5 % 0 ... 0.4 0 ... 160.74 25 bar (363 psi) 37.5 bar (544 psi) 1.2 bar (482 inH2O) 0.8 % 0 ... 0.5 0 ... 200.9 25 bar (363 psi) 37.5 bar (544 psi) 1.2 bar (482 inH2O) 0.5 % 0 ... 0.6 0 ... 241.0 25 bar (363 psi) 37.5 bar (544 psi) 1.2 bar (482 inH2O) 0.5 % 0 ... 1.0 0 ... 402.0 25 bar (363 psi) 37.5 bar (544 psi) 2 bar (804 inH2O) 0.5 % 0 ... 1.6 0 ... 643.0 25 bar (363 psi) 37.5 bar (544 psi) 3.2 bar 0.5 % (1286 inH2O) 0 ... 2.5 0 ... 1005 25 bar (363 psi) 37.5 bar (544 psi) 5 bar (2009 H2O) Wetted parts materials 0.5 % • Process connection Stainless steel 1.4305/AISI 303, brass nickel-plated 0 ... 4 0 ... 1607 25 bar (363 psi) 37.5 bar (544 psi) 8 bar 0.5 % (3215 inH2O) • Diaphragm Ceramic Al2O3 (96 %) 0 ... 6 0 ... 2411 25 bar (363 psi) 37.5 bar (544 psi) • Sealing material FPM (standard), EPDM, NBR, MVQ, CR 12 bar 0.5 % (4822 inH2O) 0 ... 10 0 ... 4019 50 bar (725 psi) 75 bar (1088 psi) 20 bar 0.5 % (8037 inH2O) 0 ... 16 0 ... 6430 50 bar (725 psi) 75 bar (1088 psi) 32 bar (464 psi) 0.5 % 0 ... 25 0 ... 10046 50 bar (725 psi) 75 bar (1088 psi) 50 bar (725 psi) 0.5 % Power supply UH Terminal voltage on pressure transmitter • 2-wire, 4 ... 20 mA 11 ... 33 V DC • 3-wire, 0 ... 5 V DC 11 ... 33 V DC/24 V AC 15 % • 3-wire, 0 ... 10 V DC 18 ... 33 V DC/24 V AC 15 % ■ Schematics Current consumption at nominal pressure • 2-wire < 20 mA • 3-wire < 5 mA Protection against polarity reversal Protected against short-circuit and polarity reversal. Each connection against the other with max. supply voltage. IO Connection: 1 (+), 2 (-) + 2- UB RL IO Output current RL Load UB Power supply Connection with current output 4 ... 20 mA and plug to EN 175301-803-A Certificates and approvals Approval 1+ 1 2 CE conformity 1+ 3 IO 2 1 Connection: 1 (+), 3 (-) + UB RL 3- IO Output current RL Load UB Power supply Connection with current output 4 ... 20 mA and round connector 1+ 2- IO Connection: 1 (+, brown), 2 (-, green) + RL UB IO Output current UB Power supply RL Load Connection with current output 4 ... 20 mA and permanently fixed cable Siemens FI 01 · 2015 US Edition 1/23 1 © Siemens AG 2015 Pressure Measurement Transmitters for basic requirements SITRANS P250 for differential pressure 1+ 3 + 1 2+ U 2 UB RL O 3- Round connector EN 60130-9 Connection: 1 (+UB), 2 (-), 3 (+U0) UO Output voltage RL Load UB Power supply 3 2 + UB RL 2 1 Connection: 1 (+UB, brown), 2 (+U0, green), 3 (-, white) UO Output voltage UB Power supply RL Load Connection with voltage output 0 ... 5 V DC (0 ... 10 V DC) and round connector 1+ UO 3+ + UB RL 2- Connection: 1 (+UB), 2 (-), 3 (+U0) Uo Output voltage UB Power supply RL Load (mounted) 3 UO ~108 (4.3) 1 ~158 (6.2) Connection with voltage output 0 ... 5 V DC (0 ... 10 V DC) and plug to EN 175301-803-A SITRANS P250 differential pressure transmitter with round connector to EN 60130-9, dimensions in mm (inch) Connection with voltage output 0 ... 5 V DC (0 ... 10 V DC) and permanently fixed cable Cable ■ Dimensional drawings (mounted) ~ 136 (5.4) 102 (4.02) ~138 (5.4) ~95 (3.7) Ø 25 (0.98) Socket outlet EN 175301-803-A Stainless steel P2 SITRANS P250 differential pressure transmitter with cable, dimensions in mm (inch) P1 M4 44 (1.7) 5 (0.2) 15 ± 0,5 21 ± 0,8 1 20 (0.79) X SITRANS P250 differential pressure transmitter with socket outlet to EN 175301-803-A, dimensions in mm (inch) 1/24 Siemens FI 01 · 2015 US Edition © Siemens AG 2015 Pressure Measurement Transmitters for basic requirements SITRANS P250 for differential pressure Process connections Width across flats [mm] [inch] Hose connection for hose (brass nickelplated) X [mm] [inch] [mm] [inch] 4 0.16 a = 10 20 0.79 61 2.40 6 0.24 a = 10 25 0.99 66 2.60 Pipe union with screw-in nipple for outer pipe 6 (brass nickel-plated) 0.24 a = 10 b = 12 24 0.95 65 2.56 8 0.32 a = 12 b = 14 25 0.99 66 2.60 Pipe union with screw-in nipple for outer pipe 6 (stainless steel 1.4305/AISI 303) 0.24 a = 10 b = 12 24 0.95 65 2.56 8 0.32 a = 12 b = 14 26 1 67 2.64 Male thread 7/16-20 UNF (brass nickel-plated) - - a = 14 18 0.71 59 2.32 Female thread G1/8 (stainless steel 1.4305/AISI 303) - - a = 14 12 0.47 53 2 Male thread G1/8 (brass nickel-plated) - - a = 10 b = 12 20 0.79 61 2.40 1/8-27 NPT L L a 1/8-27 NPT L b a 1/8-27 NPT L a b 1/8-27 NPT 7/16-20 UNF L a 1/8-27 NPT L G1/8 a 1/8-27 NPT L a b Siemens FI 01 · 2015 US Edition 1/25 1 © Siemens AG 2015 Pressure Measurement Transmitters for basic requirements 1 SITRANS P250 for differential pressure ■ Selection and Ordering data SITRANS P 250 pressure transmitter for differential pressure Accuracy 1 %, wetted parts ceramic/stainless steel 1.4301, scope of delivery: transmitter, mounting bracket and instruction manual, without explosion protection Article No. Order code 7 M F 1 6 4 1 - 7777 0 - 777 0 777 Click on the Article No. for the online configuration in the PIA Life Cycle Portal. Measuring range (0 ... 40.19 inH2O) 0 ... 0.1 bar (0 ... 80.37 inH2O) 0 ... 0.2 bar (0 ... 100.46 inH2O) 0 ... 0.25 bar (0 ... 120.56 inH2O) 0 ... 0.3 bar (0 ... 160.74 inH2O) 0 ... 0.4 bar (0 ... 201.0 inH2O) 0 ... 0.5 bar (0 ... 241.0 inH2O) 0 ... 0.6 bar (0 ... 402.0 inH2O) 0 ... 1.0 bar (0 ... 643.0 inH2O) 0 ... 1.6 bar (0 ... 1005.0 inH2O) 0 ... 2.5 bar (0 ... 1607.0 inH2O) 0 ... 4.0 bar (0 ... 2411.0 inH2O) 0 ... 6.0 bar (0 ... 4019.0 inH2O) 0 ... 10.0 bar (0 ... 6430.0 inH2O) 0 ... 16.0 bar (0 ... 10046 inH2O) 0 ... 25.0 bar 3 AA 3 AC 3 AD 3AE 3AF 3 AG 3 AH 3 BA 3 BB 3 BD 3BE 3 BG 3 CA 3 CB 3 CD Other version, add Order code and plain text (Note: smallest possible span 100 mbar (40.19 inH2O) 9 AA Output signal 4 ... 20 mA 0 ... 5 V DC 0 ... 10 V DC 0 1 2 Electrical connection Plug acc. to EN 175 301-803-A (suitable coupling included in scope of delivery) Round connector acc. to EN 60139-9 Cable 1.5 m with cable gland 1 2 3 Process connection Without connections, female thread 1/8-27 NPT Hose connection • Brass nickel-plated, for hose 4 mm • Brass nickel-plated, for hose 6 mm A B C • PVDF, for hose 6 mm Pipe union • Brass nickel-plated, for pipe 6 mm • Stainless steel 1.4304, for pipe 6 mm • Brass nickel-plated, for pipe 8 mm • Stainless steel 1.4304, for pipe 8 mm Male thread, 7/16-20 UNF (Brass nickel-plated) Adapter • Inner, G1/8 (stainless steel), for pipe mm • Outer, G1/8 (Brass nickel-plated), with union nut, for pipe 6 mm D E F G H L M N Sealing material Fluoro rubber (Viton/FPM) Ethylene propylene diene monomer rubber (EPDM) Nitrile butadiene rubber (NBR) Silicone rubber (MVQ) A B C D E Neoprene (CR) Further designs Order code Please add "-Z" to Article No. and specify Order code(s). Quality inspection certificate (factory calibration) to IEC 60770-2 1/26 Siemens FI 01 · 2015 US Edition H1Y C11