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Instruction manual - ProcessX
Digital voltmeter
To (–)
terminal
To (+)
terminal
Standard resistor
(1
7
or 10
7
)
Maintenance
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Measure output current from the transmitter on the current loop 4/20 mA and CK+/- of the
transmitter.
If the measured two output current are the same, the arrester is normal.
In case the measured values have a difference of 0.1% (0.016 mA) or more, the arrester
is not functioning. In the above case, the arrester unit (terminal unit) should be replaced
with a new one.
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An insulation resistance and dielectric strength test should be avoided as a rule, since it
may damage the arrester.
Output measurement at check terminals (CK+ and CK-)
Output measurement on the current loop (4/20 mA)
* Disconnect the wire from the – (minus) terminal and connect the measurement device a
shown below.
Standard resistance
(1
7
or 10
7
)
To (+) side wiring
To (+) terminal
To (–) terminal
To (–) side wiring
DC power
supply
Digital voltmeter