WattMaster WCC III part 12 - Manual (Page 49)

12. WCC III INSTALLATION
GUIDE
WCC III Technical Guide 12-47
When programming the Analog Input Screen, the zero percent
scale value is the value when 0 mA are supplied by the sensor.
Since 0 mA represents -0.50” W.C., -0.50” W.C. is input for the
zero percent scale value.
Thermistor Sensors
The Thermistor Flush mount sensor (WattMaster part # OE210)
is connected to the “ATI”, and “GND” connections of the SAT III
controller. A thermistor is a type of resistor with resistance that will
vary according to its temperature. The SAT III controller is set up
for 10K Type 3 thermistor sensors. The SAT III controller does all
of the complex math to linearize the temperature versus voltage
curve of the thermistor sensor. There is no calibration necessary for
thermistor type sensors, but an offset is provided for the sensor on
OVR
W
A
R
M
E
R
C
O
O
L
E
R
W
A
R
M
E
R
C
O
O
L
E
R
OVR
OE210 OE211 OE212 OE213
Figure 12-38: The WattMaster Controls, Inc. 10K Type 3 Flush Mount Sensor variations. Only the OE210 can be
used with the SAT III controller. There are no connections or programming points on the SAT III controller for
the additional slide pot (OE212, and OE213), or OVR switch (OE211 and OE213). All of these 10K Type 3 Flush
Mount sensors variations may be used with the RTU/TUC family of application-specifi c controllers.
the satellite analog input set-up screen. The 10K Type 3 Thermistor
Flush Mount sensor is one of the most accurate room sensors on the
market today for sensing basic room temperature, as the thermistor
element is thermally isolated from the wall with a patented process
developed by WattMaster Controls years ago.
There seems to be an almost endless supply of third-party sensors
that use the 10K Type 3 thermistor as the sensing element.
WattMaster Controls, Inc. can provide the following 10K Type 3
thermistor sensors:
2-Wire Thermistor Duct sensor with 6-inch probe
(WattMaster part # OE230)
2-Wire Thermistor Duct sensor with 12-inch probe
(WattMaster part # OE231)
Immersion well for 6-inch thermistor probe
(WattMaster part # OE291)
2-Wire Thermistor Outside Air sensor
(WattMaster part # OE250)
Thermistor Sensors