Quality Assurance And Self-Tests; Sensor Self-Checks; Self-Check Thresholds; Self-Check Frequency - Pentair GOYEN MECAIR PEM Manual

9 QUALITY ASSURANCE AND
SELF-TESTS

9.1 SENSOR SELF-CHECKS

Self-tests are available to provide monitoring of the integrity of your sensor(s). The sensor can provide alarm notification
of self-test failures.
ZERO / REF checks: sensor checks to test for faults with the sensor hardware.
•
SHORT-CIRCUIT (Contamination) check: if available, this sensor self-check indicates the probe needs cleaning.
•
The short-circuit check performs a test for contamination between the probe rod and the base of the probe by
checking for the existence of an electrical short circuit.

9.1.1 Self-check Thresholds

SELF-TESTS
Zero check
Reference check
Short-circuit check –
Ex variants (Dust zone 22)
Note 1 – Values given are calculated based on the min./max. Reference check (Ref) pass levels, respectively. Values have
been rounded to the nearest tens.
Example: min. pass level: 950 + 5% = 998 (~1000) and max. pass level: 1120 + 25% = 1400.
Note 2 – Applicable to standard sensors (up to 250°C) and Ex sensors for Dust zone 22. Refer to the pass levels recorded
in the Test Report for your instrument.

9.1.2 Self-check Frequency

The Zero and Reference drift checks are initiated manually on demand and will run in succession. If either of the
•
tests fail, an alarm is generated.
The Short-circuit check runs automatically on an hourly cycle. If the test fails, the test is repeated in 10-minute
•
intervals (i.e. at 20 and 30 minutes). If the test fails on all three occasions, then an alarm is generated.
NOTE: The short-circuit check may be performed outside the stack (e.g. on a bench). However, without adequate
shielding background noise will cause the short-circuit check to fail on high sensitivity. If tested out of stack,
place the sensor rod in an earthed shield tube and earth the sensor base or enclosure to the shield tube.

9.1.3 Running Self-tests [RUN.T]

1. Scroll down to the RUN.T menu heading.
2. Press RIGHT: the display now shows RUN.
3. Press RIGHT again to confirm and run the tests.
4. The Self-check LED starts flashing. All self-checks now run in succession taking a total time of about 60 seconds.
5. Once the tests have completed, return to the main DUST menu to view the self-test results (see next section).
INSTALLATION AND OPERATION MANUAL – OWNER'S RECORD PEM MANUAL – PARTICULATE EMISSION MONITOR
MINIMUM PASS LEVEL IDEAL LEVEL
–
950
900
MAXIMUM PASS LEVEL
<10 20
1000 1120
1000 1150
REFER TO
Note 1
Note 2
25