Maintenance; Regular Inspection Items; Trouble Shooting - YOKOGAWA ADMAG AM100D User Manual

4.

MAINTENANCE

WARNING
This instrument must be repaired or mainte-
nance-serviced by expert engineer or skilled
personnel. The procedures described in this
chapter are not permitted for operators.
Regular maintenance and inspection should be carried
out to fully utilize all functions and to obtain maximum
performance from the magnetic flowmeter.
4.1 Regular Inspection
Items
(1)Inspection of moisture-proofing inside the
terminal box: Once/year
(2)Refastening of piping joint screws: About
twice/year
(3)Inspection of electrodes and lining (in case
of adhesive and/or abrasive fluid, etc.)
Determine the period of regular inspection as
necessary.

4.2 Trouble Shooting

Since the ADMAG magnetic flowmeter has "self
diagnostic functions", if a failure occurs, it is displayed
on the AM11 magnetic flow converter. Please refer to
Instruction Manual of AM11 magnetic flow converter.
IMPORTANT
Be sure to disconnect the cables at the terminals
of the flow tube when checking.
(1) Excitation Coil Check
Check that the resistance between terminals EX1 and
EX2 in the terminal box is 150 Ω or less with a
multimeter. If it is not, coils may be broken down, and
replacement or repair of the flow tube is needed.
(2) Insulation Resistance Check
Check the insulation resistances in accordance with the
tables below. If one of them falls below the value in
the tables, replacement or repair of the flow tube is
needed. In case of submersible type flowmeter, release
wiring connection of converter side and measure
resistance at cable terminations.
Coil Circuit
Checking is possible even if the pipe is filled with
fluid.
Test Terminals
Between Terminals EX1 and C
Signal Circuit
Be sure to empty and dry the pipe inside, and release
wiring connection of converter side before checking.
Test Terminals
Between Terminals A and C
Between Terminals B and C
4-1
4. MAINTENANCE
Test Voltage Specification
500 V DC 1MΩ or more
Test Voltage Specification
500 V DC 100MΩ or more for each
IM 1E6D0-01E
T0401.EPS
T0402.EPS