TMT162 Technical data
Endress+Hauser 45
Maximum measured error
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
®
2000 software or the HART
®
handheld the TMT162 can be
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:
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.
Designation
Accuracy
Digital D/A
1)
1) % relates to the set span. Accuracy = digital + D/A accuracy
Resistance
thermometer (RTD)
Cu100, Pt100, Ni100, Ni120
Pt500,
Cu50, Pt50, Pt1000, Ni1000
Cu10, Pt200
0.18 °F (0.1 °C)
0.54 °F (0.3 °C)
0.36 °F (0.2 °C)
1.8 °F (1 °C)
0.02%
0.02%
0.02%
0.02%
Thermocouples (TC)
K, J, T, E, L, U
N, C, D
S, B, R
typ. 0.45 °F (0.25 °C)
typ. 0.9 °F (0.5 °C)
typ. 1.8 °F (1.0 °C)
0.02%
0.02%
0.02%
Measuring range
Accuracy
Digital D/A
1)
1) % relates to the set span. Accuracy = digital + D/A accuracy
Resistance transmitter
(Ω)
10 to 400 Ω
10 to 2000 Ω
± 0.04 Ω
± 0.8 Ω
0.02%
0.02%
Voltage transmitter
(mV)
-20 to 100 mV ± 10 μV0.02%
Physical input range of the sensors
10 to 400 Ω Cu10, Cu50, Cu100, Polynomial RTD, Pt50, Pt100, Ni100, Ni120
10 to 2000 Ω Pt200, Pt500, Pt1000, Ni1000
-20 to 100 mV Thermocouple type: C, D, E, J, K, L, N
-5 to 30 mV Thermocouple type: B, R, S, T, U
R
T
R
0
1
AT BT
2
CT
100–
()
T
3
++ +
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