Checking The Sensor Condition Fitted Into Piping And Flooded With A Measured Liquid - Elis FLONET FN20xx.1 Series Design, Assembly And Service Manual

ELIS PLZEŇ a. s.

8.3.2.2. Checking the sensor condition fitted into piping and flooded with a measured liquid

The sensor grounding electrode is connected to the piping or grounding rings.
Schematic diagram: a particular sensor need not include all the depicted electrodes
Example: Measurement of R1. Connect Ohm-meter to connector pins 8 and 4 and measure resistance. Then
exchange the Ohm-meter leads and measure resistance again. Calculate the average value of the two
measurements and enter it as "Measured Value" into the table below.
Parameter Description
R1 Coil to sensor body insulation resistance (>2MΩ)
R2 Excitation coil resistance (36 to 44Ω)
R3 Liquid resistance between measuring electrode and sensor body
R4 Liquid resistance between measuring electrode and sensor body
R7 Liquid resistance between measuring electrodes
R8 Liquid resistance between grounding electrode and sensor body
R10 Liquid resistance between dry-condition electrode and sensor body
R11 Liquid resistance between dry-condition electrode and sensor body
R14 Liquid resistance between dry-condition electrodes
Comments:
If the electrodes indicating the not fully flooded (dry) piping condition are not included in the sensor
configuration, connector pins 5 and 6 are shorted and parameters R10 and R11 need not be measured. The
R14 measurement shall indicate a short-circuit condition.
If the grounding electrode is missing, connector pin 3 remains unconnected and parameters R8 need not be
measured.
ELIS PLZEŇ a. s., Luční 425/15, 301 00 Plzeň, Czech Republic, Phone: +420/377 517 711, Fax: +420/377 517 722
Design, Assembly and Service Manual
Electromagnetic flowmeter FLONET FN20xx.1
Page 55 of 69
Measured value
Es90420K/c