Proof testing Micropilot FMR62
22 Endress+Hauser
3. If (as an option) the function of the measuring point is to be checked immediately
before the switch point, check the function before the MIN or MAX switch point:
Approach the level directly below (MAX monitoring) or above (MIN monitoring) the
point level to be monitored. Read the output current, record it and assess for
accuracy. This does not check the safety function of the device.
The test is to be considered successful if the current values trigger or ensure the required
function.
Procedure for range monitoring
1. Approach five levels within the range to be monitored.
2. Read the output current at each level value, record it and assess for accuracy.
The test is to be considered successful if the current values in step 2 are within the
required level of accuracy.
NOTICE
The device has failed the proof test if the current value at a specific level deviates by >
± 2% from the expected value.
99% of dangerous, undetected failures are detected using this test (proof test coverage
(PTC) = 0.99).
‣
For troubleshooting measures, see the Operating Instructions.
6.2 Test sequence B
Preparatory steps
1. Prepare a test tank with test medium (dielectric constant comparable to that of the
medium to be measured). For installation instructions, refer to the Operating
Instructions
2. Deactivate SIL mode. To do so, in the operating menu select "Setup → Advanced setup
→ Deactivate SIL/WHG → Reset write protection" and enter the appropriate unlocking
code (WHG: 7450; SIL: 7452; SIL and WHG: 7454).
The SIL mode is deactivated.
3. Remove the device and mount it in the test tank.
4. Connect a suitable measuring device (recommended accuracy better than ±0.1 mA)
to the current output.
5. Perform interference echo mapping if the shape and size of the test tank is different.
6. Determine the safety setting (point level or range monitoring).
Procedure for point level monitoring
1. Approach a level directly below (MAX monitoring) or directly above (MIN
monitoring) the point level to be monitored.
2. Read the output current, record it and assess for accuracy.
3. Approach the level directly above (MAX monitoring) or directly below (MIN
monitoring) the point level to be monitored.
4. Read the output current, record it and assess for accuracy.
The test is to be considered successful if the current in step 2 does not result in activation
of the safety function but the current in step 4 does.
Procedure for range monitoring
1. Approach five levels within the range to be monitored.
2. Read the output current at each level value, record it and assess for accuracy.
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