Appendix Temperature transmitter iTEMP TMT82
32 Endress+Hauser
7 Appendix
7.1 Structure of the measuring system
The measuring system's devices are shown in the following diagram (example).
Commubox
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2
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PMC731: PIC0001
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2 PV 0.7 bar
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A0053681
8 HART® connection with device from the RN Series product family from Endress+Hauser, including a built-
in communication resistor
1 Temperature transmitter
2 HART® handheld communicator
3 PLC/DCS
4 Configuration software, e.g. FieldCare
5 Configuration via SMT70
6 Device from the RN Series
An analog signal (4 to 20 mA) in proportion to the relevant sensor value is generated in
the transmitter. This is sent to a downstream logic unit (e.g. PLC, limit signal transmitter)
where it is monitored to determine whether it is above or below a specified limit value. For
fault monitoring, the logic unit must be able to recognize and analyze both high alarms (≥
21.0 mA) and low alarms (≤ 3.6 mA).
NOTICE
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The optional plug-in display is not part of the safety function. Neither the hardware nor
the software of the display have a verifiable influence on the defined safety functions
of the transmitter. The CDI interface is not safe and therefore may not be used in
safety-related applications. The interface cannot be used for the expert mode.
Correct installation is a prerequisite for safe operation of the device.
7.1.1 Measurement function
NOTICE
Galvanic isolation
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When two sensors are connected to the transmitter, make sure the sensors are
galvanically isolated from one another.
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