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

ELIS PLZEŇ a. s.

8.3.3.2. 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 the terminals E a B 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
Coil to sensor body insulation resistance (>2M Ω)
R1
Excitation coil resistance (36 to 44 Ω)
R2
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 Interconnection between points PE and B (short circuit)
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
Note:
If the electrodes indicating the not fully flooded (dry) piping condition are not included in the sensor
configuration, terminals pins W1 and W2 are free and resistances R10, R11 and R14 need not be measured.

8.3.3.3. Checking the condition of the cable connecting sensor and associated transmitter

Important notice: Prior to checking the condition of the connecting cable, disconnect the flat connector on
the side of the transmitter. After the check, plug the connector in again.
Remove the cover at the rear side of the transmitter housing. The cover is held in position by means of six
socked screws. With the cover removed, loosen and remove two RSK pin nuts using size 5 Alien wrench.
Then the front panel can be lifted off (mind the flat keypad cable). Disconnect the keypad. Pull out the
electronic block including the FNA5, FNP5 and FNZ5 boards by some 20mm, disconnect the connector of
the flow sensor from the analog board FNA5 and remove the block from the unit box. When reassembling
the unit, proceed in reverse order of the above steps.
During the inspection, the connecting cable shall be disconnected from both the meter sensor and the
transmitter. Check the integrity of individual cable conductors, insulation resistance between the cable
conductors and insulation resistance between each cable conductor and shielding. The shielding connection
is on the side of the meter sensor only.
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 57 of 69
Measured value
Es90420K/c