Senztek SolaStat-Plus - Sensor Resistances

SolaStat™-1-3 Installation Guide
Version 1.1 – April 2013 Page 27
SENSOR MAINTENANCE, CONTINUED
Replacing a
Sensor,
continued
7. Place the wires of the new sensor into the terminal block where the old
sensor came from and retighten the screws.
8. 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.
9. Replace the lid, replace the four screws and tighten.
10. Push in four new screw covers available from your distributor or Senztek.
Note: there are locating lugs to ensure correct orientation.
11. Reconnect the SolaStat
TM
and turn on the power.
12. Check that the sensor is reading correctly.
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
to measure
these values correctly.
Follow the above procedure to remove a sensor.
Sensor Resistances
Temperature
Resistance in k
Ω
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.
0°C (32°F) 27.25
25°C (77°F) 10.00
50°C (122°F) 4.162
75°C (167°F) 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.
100°C (212°F) 0.973
Above 150°C (302°F)
or ‘short’
‘SSd’ on display
Sensor light on
<0.300
Below -40°C (-40°F)
or ‘open’
‘SSd’ on display
Sensor light flashing
>200