Installation Guide for the SolaStat™-Plus-ET
Version 1.2 – July 2011
Page 23
S
ENSOR
M
AINTENANCE
,
C
ONTINUED
Replacing a
Sensor,
continued
9. Do not allow the sensor cable to come within 10mm of the high voltage
connectors or components inside the enclosure. Tighten the screws on
the cable clamp.
10. Replace the lid, replace the 4 screws and tighten.
11. Push in 4 new screw covers available from your distributor or Senztek
Ltd. Note: there are locating lugs to ensure correct orientation.
12. Reconnect the SolaStat
TM
-Plus-ET and turn on the power.
13. Check sensor is reading correctly and check SolaStat
TM
-Plus-ET
operation as per What You Will See section of this manual.
Sensor
Resistances
The table below has the correct resistance values of the sensor at different
temperatures. The sensor must be removed from the SolaStat
TM
-Plus-ET to
measure these values correctly.
Follow the above procedure for removal of a sensor.
Sensor Resistances
Temperature
Resistance in k
A ‘short’ circuit can be
caused by the sensor wires
being connected together.
Check the wires are not
partially cut and that moisture
is not getting into the sensor
causing corrosion.
0C 27.25
25C 10.00
50C 4.162
75C
1.925
An ‘open’ circuit can be
caused by the sensor wires
being broken. Check the
wires are not broken and that
moisture is not getting into
the sensor causing corrosion.
100C 0.973
Above 150C or ‘short’
‘SSd’ on display
Sensor light on
<0.300
Below -40C or ‘open’
‘SSd’ on display
Sensor light flashing
>200