Endress+Hauser iTEMP HART TMT162 Bedienungsanleitung Seite 96

Technical data
96
Cu100, Pt100, Ni100, Ni120
Resistance thermometer Pt500
(RTD) Cu50, Pt50, Pt1000, Ni1000
Cu10, Pt200
K, J, T, E, L, U
Thermocouples (TC) N, C, D
S, B, R
Measuring range
10 to 400 
Resistance transmitter
10 to 2000 
()
Voltage transmitter -20 to 100 mV
(mV)
1) % relates to the set span. Accuracy = digital + D/A accuracy, for 4 to 20 mA output
Physical input range of the sensors
10 to 400  Cu10, Cu50, Cu100, Polynomial RTD, Pt50, Pt100, Ni100, Ni120
10 to 2000  Pt200, Pt500, Pt1000, Ni1000
-20 to 100 mV Thermocouple type: C, D, E, J, K, L, N, U
-5 to 30 mV Thermocouple type: B, R, S, T
Sensor transmitter matching
RTD sensors are one of the most linear temperature elements for measurement. However,
the output still needs to be linearized. To significantly improve temperature measurement
accuracy, the TMT162 allows you to utilize two methods to achieve that:
• Customer specific linearization
Using the E+H Readwin
programmed with sensor specific curve data. Once the sensor-specific data has been
entered, the TMT162 utilizes this to generate a custom curve.
• Callendar - Van Dusen coefficients
The Callendar - Van Dusen equation is described as:
R
T
where A, B and C are constants, commonly referred to as Callendar - Van Dusen
coefficients. The precise values of A, B and C are derived from the calibration data for the
RTD, and are specific to each RTD sensor.
The process involves programming the TMT162 with curve data for a specific RTD, instead
of using the standard curve.
Sensor transmitter matching using any of the above methods substantially improves the
temperature measurement accuracy of the entire system. This is as a result of the
transmitter using the sensor's actual resistance vs. temperature curve data instead of the
ideal curve data.
Repeatability
0.0015% of the physical input range (16 Bit)
Resolution A/D conversion: 18 Bit
Influence of the supply voltage
 ±0.005%/V deviation from 24 V, related to the full scale value
®
2000 software or the HART
2
= R [ 1 AT BT + + +
0
0.1 °C (0.18 °F) 0.02%
0.3 °C (0.54 °F) 0.02%
0.2 °C (0.36 °F) 0.02%
1 °C (1.8 °F) 0.02%
typ. 0.25 °C (0.45 °F) 0.02%
typ. 0.5 °C (0.9 °F) 0.02%
typ. 1.0 °C (1.8 °F) 0.02%
Accuracy
Digital D/A
± 0.04 
0.02%
± 0.8 
0.02%
± 10 μV
0.02%
®
handheld the TMT162 can be
3
C T 100 ( – )T ]
Endress+Hauser
TMT162
1