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TROUBLESHOOTING AND CUSTOMER SUPPORT

Independent Verification of Functionality:

Apogee ST-110 temperature sensors yield a resistance proportional to temperature. A quick and easy

check of sensor functionality can be accomplished with an ohmmeter. Connect the lead wires of the

ohmmeter to the black and red wires from the sensor. The resistance should read 10 k (10,000 ohms) at

25 C. If the sensor temperature is less than 25 C, the resistance will be higher. If the sensor temperature is

greater than 25 C, the resistance will be lower. Connect the lead wires of the ohmmeter to the black and

blue wires from the sensor. The resistance should read 24.9 k, and should not vary. Connect the lead

wires of the ohmmeter to the red and blue wires from the sensor. The resistance should be the sum of the

resistances measured across the black and red wires, and black and blue wires (e.g., 10 k plus 24.9 k at

25 C).

Apogee ST-300 temperature sensors yield a resistance proportional to temperature. A quick and easy

check of sensor functionality can be accomplished with an ohmmeter. Connect the lead wires of the

ohmmeter to the red/black (red and black are connected internally, without a resistor between them;

continuity between red and black indicates both wires are functional) and white wires from the sensor.

The resistance should read 100  (0.1 k) at 0 C. If the sensor temperature is less than 0 C, the resistance

will be lower. If the sensor temperature is greater than 0 C, the resistance will be higher. Connect the lead

wires of the ohmmeter to the red/black and orange wires from the sensor. The resistance should read 10

k, and should not vary. Connect the lead wires of the ohmmeter to the orange and white wires from the

sensor. The resistance should be the sum of the resistances measured across the red/black and white

wires, and red/black and orange wires (e.g., 100  plus 10 k at 0 C).

A quick and easy check of fan functionality can be determined using a DC power supply. Power the fan

with 12 V DC by connecting the positive voltage signal to the red wire from the fan and the negative (or

common) to the black wire from the fan. When powered, the fan blades should spin. Make sure to keep

fingers clear of blades before connecting fan to 12 V DC.

Compatible Measurement Devices (Dataloggers/Controllers/Meters):

Measurement of ST-110 thermistor resistance requires an input excitation voltage, where 2.5 V DC is

recommended. Measurement of ST-300 PRT resistance also requires an input excitation voltage, where

2.1 V DC is recommended. A compatible measurement device should have the capability to supply the

necessary voltage for the specific sensor.

The sensitivity (mV output from thermistor per C) of the temperature measurement from the ST-110

thermistor varies with the excitation voltage, and varies as a function of temperature. With an excitation

voltage of 2.5 V DC, the sensitivity is lowest near the ends of the measurement range, -50 and 70 C. A

compatible measurement device (e.g., datalogger or controller) should have resolution of at least 0.6 mV,

in order to produce temperature resolution of less than 0.1 C across the entire temperature measurement

range (less than 0.05 C from -35 to 45 C).

The sensitivity (mV output from PRT per C) of the temperature measurement from the ST-300 PRT is

approximately constant across the entire measurement range. With an excitation voltage of 2.1 V DC, a