SYMPTOMS
FAULTS
SOLUTIONS
C,D
- wiring or installation close to
variable speed drive or inverter
- follow VSD manufacturer’s instructions
for Drive grounding wiring and
shielding
C,D,E
- AC/Chassis Ground missing on
instrument power connections
- install adequate Ground
I
- relay sparking produces EMI
interference
- use snubber across Relay contacts
(option SNUB)
- do not exceed 1 ampere load
I
- instrument installed in the same
panel with high voltage/large motor
controls
- relocate or use metal enclosure
Wiring Problems Due to Sensor Cable:
C,F
- open circuit
- check connections/continuity (8850 to
12700 ohms max./-30°C to +70°C )
F
- short circuit
- check connections/continuity (8850
ohms min.)
F
- too long (max. 500 ft, 150 m)
C
- bundled/run in conduit with power
cable
C
- sensor ground shorted to
conduit/enclosure
- insulate
A
- extended with wrong type of wire
- use only RG62AU coaxial
C
- close to high voltage/large motors
Non-Linearity Due To:
H
- vapour
- calibrate in-situ
B,H
- zero not set accurately
- recalibrate
H
- full scale not set accurately
- Note: Minimum Range must be
≥
12”
(30.5cm)
Page 20
LIT25 Level Indicating Transmitter
Manual Series 3.5.1
