Operating Instructions

Technical data iTEMP TMT72
46 Endress+Hauser
Thermocouples as
per standard
Designation Measuring range limits Min. span
• Internal cold junction (Pt100)
• External cold junction: configurable value –40 to +85 °C (–40 to +185 °F)
• Maximum sensor wire resistance 10 kΩ (If the sensor wire resistance is greater than 10 kΩ, an error message is output in
accordance with NAMUR NE89.)
Voltage
transmitter (mV)
Millivolt transmitter (mV) –20 to 100 mV 5 mV
13.2 Output
Output signal
Analog output 4 to 20 mA, 20 to 4 mA (can be inverted)
Signal encoding FSK ±0.5 mA via current signal
Data transmission rate 1200 baud
Galvanic isolation U = 2 kV AC (input/output)
Failure information Failure information as per NAMUR NE43:
Failure information is created if the measuring information is missing or not valid. A
complete list of all the errors occurring in the measuring system is created.
Underranging Linear drop from 4.0 to 3.8 mA
Overranging Linear increase from 20.0 to 20.5 mA
Failure e.g. sensor failure; sensor short-circuit ≤ 3.6 mA ("low") or ≥ 21 mA ("high"), can be selected
The "high" alarm setting can be set between 21.5 mA and
23 mA, thus providing the flexibility needed to meet the
requirements of various control systems. Only the "low" alarm
setting is possible in the SIL mode.
Load
R
b max.
= (U
b max.
- 10 V) / 0.023 A (current
output). Valid for head transmitter
Ub
36 V
1130
880
250
10 V
0
30.25 V15.75 V
Supply voltage (V DC)
Load (Ω)
A0036051-EN
Linearization/transmission
behavior
Temperature-linear, resistance-linear, voltage-linear
Network frequency filter 50/60 Hz
Filter 1st order digital filter: 0 to 120 s
Protocol-specific data
Manufacturer ID 17 (0x11)
Device type ID 0x11D0