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Klinger CMF
Instruction Manual
Page 67
If the wiring between the sensor and the transmitter is not properly connected or the
connection is damaged, the flow meter will not work properly.
7.5.2.1 Keep power off before opening the junction boxes.
In explosive zone, wait at least 5 minutes after power off while you remove the
transmitter’s covers.
7.5.2.2 Please strictly follow the guide for wiring.
7.5.2.3 Make sure all wiring is tightened.
7.5.3 Check grounding
Reliable grounding must be ensured of sensor and transmitter, the grounding resistance
≤4Ω.
Poor grounding might lead to poor measurement performance.
7.5.4 Check if there is radio frequency interference (RFI)
The output of the transmitter may be affected by radio frequency interference (RFI). Possible
sources of RFI include Radio emission source or large transformer, pump or motor that can
produce huge magnetic field. RFI can be reduced by a variety of methods.
7.5.4.1 Remove RFI source.
7.5.4.2 Moving transmitter.
7.5.4.3 Using shielded cable for frequency or discrete output.
7.5.4.4 It is unnecessary for all shielding connection.
7.5.5 Coil detection
For remote flow meter, with a digital multi-meter you can easily test the coil resistance
through the junction box.
7.5.5.1 Remove the cable between sensor & transmitter
7.5.5.2 Test the resistance between Pin3/Pin4 (L+/GND) & Pin5/Pin4(R+/GND). The value
difference should be less than ±2Ω.
7.5.5.3 Test the resistance between Pin1/Pin2 (D+/D-). Short or open means faulty coil.
