TMT84 Technical data
Endress+Hauser 47
10.0.3 Power supply
Supply voltage U = 9 to 32 V DC, polarity-independent (max. voltage U
b
= 35 V)
10.0.4 Performance characteristics
Response time 1 s per channel
Reference operating condi-
tions
• Calibration temperature: + 25°C ± 5 K (77°F ± 9°F)
• Supply voltage: 24V DC
• 4-wire connection for resistance adjustment
Resolution Resolution A/D converter = 18 bit
Maximum measured error
!
Note!
The accuracy data are typical values and correspond to a standard deviation of ± 3 (normal
distribution), i.e. 99.8% of all the measured values achieve the given values or better values.
Sensor transmitter matching
RTD sensors are among the most linear temperature elements for measurement. However, the out-
put must still be linearized. The device provides two methods to improve significantly temperature
measurement accuracy:
• Callendar Van Dusen coefficients (Pt100 resistance thermometer)
The Callendar Van Dusen equation is described as:
The coefficients A, B and C are used to adjust the sensor (platinum) and transducer to improve
the accuracy of the measuring system. The coefficients are specified in IEC 751 for a standard sen-
sor. If no standard sensor is available, or a higher level of accuracy is required, specific coefficients
can be determined for each sensor with the aid of sensor calibration.
• Linearization for copper/nickel resistance thermometers (RTD):
The equations of the polynomial for nickel are described as:
The equations for copper, in conjunction with the temperature, are described as:
T = -50°C to 200°C (-58°F to 392°F)
Designation Performance characteristics
Resistance thermometers (RTD)
Cu100, Pt100, Ni100, Ni120
Pt500
Cu50, Pt50, Pt1000, Ni1000
Cu10, Pt200
0.1 °C (0.18 °F)
0.3 °C (0.54 °F)
0.2 °C (0.36 °F)
1 °C (1.8 °F)
Thermocouples (TC)
Type: K, J, T, E, L, U
Type: N, C, D
Type: S, B, R
typ. 0.25 °C (0.45 °F)
typ. 0.5 °C (0.9 °F)
typ. 1.0 °C (1.8 °F)
Measuring range Performance characteristics
Resistance transmitters () 10 to 400
10 to 2000
± 0.04
± 0.8
Voltage transmitters (mV) -20 to 100 mV ± 10 V
R
T
R
0
1ATBT
2
C T 100–()T
3
++ +[]=
R
T
R
0
1ATBT
2
C T 100–()T
3
++ +[]=
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