Temperature Transmitters TMT 136, TMT 137

Transcription

1 Technical Information TI 066R/09/en Part No Temperature Transmitters TMT 136, TMT 137 For Pt100 Resistance Thermometers 2-wire head transmitter Standard- and instrinsically safe versions Head mounting (DIN B) Application The TMT 136 and TMT 137 are designed as head mounting transmitters for Pt100 resistance thermometers. The Pt100 resistance input signal is converted by the 2-wire transmitter into a ma current output (live zero), linear to temperature. The power supply and output signals are connected on the same two wires. Features and Benefits Simple 2-wire connection Adjustable range for TMT 136, the zero and the span are adjustable with potentiometers Plug and play for TMT 137 High accuracy measurement High electromagnetic interference immunity Certificate: EEx ia IIC T4, T5, T6 version available

2 Measuring System Loop wiring example RTD thermometer Transmitter TMT 136 or TMT 137 Indicator Power supply U In addition to the TMT 136 or TMT 137 transmitter, a complete system consists of: a Pt100 3-wire temperature sensor to be connected to the transmitter input circuit; the transmitter may be also connected to a Pt100 2-wire sensor a power supply a receiver (indicator, recorder) Measurement Principle The Pt100 resistance thermometer is supplied with a constant current (1 ma) by the transmitter. In the voltage amplifier the input voltage signal is compared with the internal reference voltage. This difference is amplified and linearised before the conversion into ma current by the output stage. The output stage incorporates an electronic current limitation circuit. All versions can operate correctly with reversed polarity. Intrinsically Safe Versions TMT 136-Z or TMT 137-Z can be mounted in hazardous areas, see picture below. Hazardous Area Safe Area Example of application in hazardous areas: U RTD thermometer for Zone 0 applications Transmitter TMT 136-Z or TMT 137-Z Loop powered display RIA 251 approved for intrinsically safety applications Safety barrier Load e.g.: indicating instrument DC power supply Certification number, according to : Max. current : Max. voltage : Max. power consumption : Max. ambient temperature : CESI No. EX-98.D.091 EEx ia IIC T6, T5, T4 Ci 0, C 0 3µF Li 0, C 0 3mH 100 ma 30 V 0.75 W T4=75 C, T5=65 C, T6=50 C

3 Installation The TMT 136 and TMT 137 transmitters are suitable for mounting in standard DIN form B thermometer heads. Endress+Hauser has a full range of heads and thermowells available to provide complete assemblies for process temperature measurement. The TMT 136 and TMT 137 transmitters can be installed in the following Endress+Hauser head models: TA20A, TA20B, TA20C, TA20D, TA20E, TA20F, TA20G, TA20U, TA20W and TA20X. Mounting example: Input wires from sensor Spring Mounting support Locking washer Screw Thermometer inset For temperature local visualisation, the TMT 136 and TMT 137 transmitters can be mounted into the TA20U head with integrated LC display. The TA20U model is also approved for intrinsically safe application. TA20U terminal head with built-in transmitter The head transmitters TMT 136 and TMT 137 can also be mounted separately from the process in the field housing TAF 10. It is constructed from diecast aluminium, protection class IP66. The housing can be wall mounted or fitted on a pipe. Field housing TAF 10

4 Installation (continued) Dimensions of the field housing TAF 10 Technical Data General Information Warm-up time: 60 s Power supply: 10 to 36 Vfor standard version 10 to 30 Vfor EEx Voltage drop: 10 V Permissible ripple: 50% of power supply within the admitted voltage range Humidity: 0to 95% non condensing Storage temperature (IEC ): -30 to +100 C Working temperature (IEC ): -20 to +75 C for standard version for Intrinsically Safe Versions see page 2 Shock: according to IEC Vibration: according to IEC Temperature drift: Model Span >50 C [1] TMT ppm / C TMT ppm / C Note [1] : for span <50 C the drift data increase is proportional to the temperature span decrease (min. 30 C) Sensor current: Electrical connections: 1mA screw terminals, 1.5 mm 2 max. wires RTD Input Type: Measuring ranges: Accuracy: Pt100 according to IEC751 Model Span Zero TMT 136- * A ** 30to 100 C -100 to +10 C TMT 136- * B ** 100 to 300 C -50 to +50 C TMT 136- * C ** 200 to 600 C -100 to +100 C TMT 137- *** TMT 136 -Span Aand B TMT 136 -Span C [3] refer to order key for standard ranges Model Accuracy [2] Linearity [3] TMT 137 -Range A,B,C,D,E,F,K,L,M,P,R TMT 137 -Range G,H,J [3] 0.1% of span or 0.1 C 0.1% of span Note [2] :for factory calibrated Zero and Full scale points (the value to be applied is the greater) Note [3] :0.15% for calibrated span >400 C Connections: Line resistance influence: 2or 3wires 0.05 C/Ω (3 wires)

5 Technical Data (continued) Output Current output: ma Current limitation: 30 ma ± 10% Sensor error: Pt100 open, 30 ma nominal Pt100 in short circuit, 3.5 ma nominal Supply voltage effect: 0.005% / V Load effect: 0.001% / 10 Ω Max. load Resistance: (Vsupply - 10) / A Long term stability (12 months): 0.05% of span Electromagnetic compatibility Interference immunity according to EN ; Interference emission according to EN industrial standard. Dimensions d43 33 d Zero Span 25.1 d43 33 d d d d d TMT 136 dimensions (in millimeters) TMT 137 dimensions (in millimeters) For installation in Form B transmitter head according to DIN Order Key Head Transmitter TMT wire head mounting temperature transmitter, Pt100 3-wire input, output...20 ma linear, Certification R - Standard version Z - Certified EEx ia IIC T4, T5, T6 Span and zero adjustment [1] A - Span 30 to 100 C ; zero 100 to +10 C B - Span 100 to 300 C ; zero 50 to +50 C C - Span 200 to 600 C ; zero 100 to +100 C Range adjustment 0 - Range not pre-adjusted 1 - Span and zero adjusted to specification Labelling 0 - E+H standard TMT 136- Order Code Note [1] : Range examples for 0 to 50 C range, type A is suitable with Zero = 0 and Span = 50 calibration for 0 to 200 C range, type B and C are both suitable with Zero = 0 and Span = 200, but for type C the span calibration is at the minimum limit point (200) hence type B is the suggested version although type C calibration is possible for -20 to 100 C range, the calibration is done with Zero = - 20 and Span = 120 then only type B is suitable

6 Order Key Head Transmitter TMT wire head mounting temperature transmitter, Pt100 3-wire input, output ma linear, fixed range Certification R - Standard version Z - Certified EEx ia IIC T4, T5, T6 Measuring range A - Range C B - Range C C - Range C D - Range C E - Range C F - Range C G - Range C H - Range C J - Range C K - Range C L - Range C M - Range C P - Range C R - Range C Labelling 0 - E+H standard TMT 137- Order Code United Kingdom Endress + Hauser Ltd. Floats Road Manchester M23 9NF Tel. (0161) Fax. (0161) Export Division Endress+Hauser Instruments International GmbH+Co. P.O. Box 2222 D Weil am Rhein Germany Tel. (7621) Tx Fax (7621) TI066R/09/en/04.99 Part No Printed in Germany/KW/CV5