25
V1.4 March 15
7.0 MAINTENANCE
Geosense
®
NPC
-
3000 NATM Cells
are a maintenance free device for most applications.
This is because it is intended for sub
-
surface installation and would normally be
irretrievably sealed into concrete.
Maintenance of wiring connections between the NATM cell and any terminal panels / or
loggers should involve occasional tightening of any screw terminals to prevent loose
connections or cleaning to prevent the build up of corrosion.
8.0
TROUBLESHOOTING
It is generally accepted that when a Vibrating Wire instrument is producing a stable
reading on a suitable readout, the value will be correct. Only on very rare occasions will
this be untrue.
In almost all cases, a fluctuating reading is a sign of a faulty signal from the sensor. The
fault could be in either the sensor, the connecting cable, any switch boxes or the readout.
The best way to fault find an instrument is to isolate it from all other instruments and
connections. Where possible begin fault finding from the sensor itself.
SYMPTOM
REMEDY
No reading from cell
Check for cable damage
No reading from cell
Check readout or data logger functionality
Unstable readings
Check readout setting
Unstable readings
Check data logger frequency settings
Unstable readings
Check for electrical interference
Unstable readings
Check earth
