Endress+Hauser Proline Promag 300 - Page 38

Proof testing Proline Promag 300 HART
38 Endress+Hauser
Connecting the measuring equipment and external testing
• Connecting the measuring equipment in the measuring circuit
• External check of the passive current output
Requirements for the measuring equipment:
• DC current measuring uncertainty ±0.2 %
• DC current resolution10 µA
2
1
A
3
4
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 3 External verification taking the example of a passive current output
1 Automation system with current input (e.. g. PLC)
2 Power supply unit
3 Ammeter
4 Transmitter
1. Connect the ammeter to the transmitter by looping it in series into the circuit.
2. Connect the power supply unit.
Evaluation of results: Testing of current output 1
The amount of deviation between the measured current and the set point must not exceed the
measured error specified for the safety function. The deviation should not exceed ±1 % /
±300 µA.
‣
Follow the information in the section on "Restrictions for use in safety-related applications,
information on measured errors" →  17.