RST Instruments VW2100, Instruction Manual, Page: 26 / 34

VW2100 Vibrating Wire Piezometer
Instruction Manual
ELM0005P RST Instruments Ltd. Page 26
4
The vibrating wire piezometer housing may be shorted to the shield. Check the
resistance between the shield drain wire and piezometer housing. The resistance
should very high.
5
The vibrating wire piezometer may have been over-ranged or physically
damaged. Inspect the diaphragm and housing for any obvious damage. Contact
RST Instruments if necessary.
6.3 T
HERMISTOR
R
EADING IS
T
OO
L
OW
1
If the calculated temperature from the thermistor resistance reading is
unrealistically low, it is very likely that there is an open circuit or poor connection
in the thermistor wiring which is resulting in excessive resistance.
2
Check all connections, terminals, and plugs for any damage or corrosion that
could cause excessive in-line resistance.
3
If cable damage or a cut is located, a splice must be performed to return the
function of the wire connection to normal. It is recommended that an RST
ELSPLICE4 Electrical Cable Splice Kit for Vibrating Wire Cables be used to
ensure a strong and waterproof splice.
6.4 T
HERMISTOR
R
EADING IS
T
OO
H
IGH
1
If the calculated temperature from the thermistor resistance reading is
unrealistically high, it is very likely that there is a short circuit in the thermistor
wiring which is resulting in a lower resistance reading.
2
Check all connections, terminals and plugs for any damage or current leakage
that could explain a partial short that could result in a reduced circuit resistance.
If a short or partial short is located in the cable, the cable must be repaired with a
splice. It is recommended that an RST ELSPLICE4 Electrical Cable Splice Kit for
Vibrating Wire Cables be used to ensure a strong and waterproof splice.
3
If no obvious sources of shorting are found, it is possible that water may have
penetrated into the interior of the piezometer. There are no remedial actions
available if this is concluded to be the case