An intrinsically safe multimeter can only measure the current
or voltage of a valve, but the Magnet-Ex 12 will indicate as
to whether or not there is a sufficiently active magnetic field.
This way the operator can detect a fault of the valve spool.
If the valve does not work properly although the probe has
detected a magnetic field, the valve is probably jammed.
Probe
LED indicator
Using the test magnet,
a self-test is performed.
Clip
Removable
cap with
If the probe is placed near
test magnet
a magnetic field, for example
of a solenoid valve, the LED
indicator of the probe will light up.
2.3 Battery replacement
When the power of the batteries is becoming exhausted, the
LED becomes perceptibly darker while the sensor unit still
works faultlessly. Use the test magnet, which is located in the
cap of the housing of the Magnet-Ex 12, to check the bright-
ness and the proper functioning of the LED. If the LED is be-
coming darker or does not light up at all, you have to replace
the batteries (always outside the Ex-area). Only type-tested
batteries are to be used (refer to the table with type-tested
batteries in the separate safety instructions MAS-0153).
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