Tech Note 560 Detail

CI-6527A gives absurd results.

Affected Products:

CI-6527a Thermistor Temperature Sensor

Problem/Symptom:
CI-6527A reports absurd results.

PASCO Solution:

The CI-6527A includes two thermistors that have values of 10.000 kOhms and 100.00 kOhms at 25 C. To obtain a correct temperature reading from the temperature sensor, you must both have software that correctly interprets the voltage reading from the sensor and have the sensor connected to the correct port:

  1. Download and install the latest version of DataStudio.
  2. Click the Setup button.
  3. Click on the channel to which the sensor will be connected.
  4. Select "thermistor". (The "Temperature" option should give you the correct value, whether you are using a 10 KOhm or 100 kOhm thermistor.)
  5. Using a multimeter, measure the resistance of the thermistor at room temperature (25 C). You should either measure ~100 kOhms or ~10 kOhms. If you do not measure close to one of these two values with a multimeter, then you have a defective thermistor.
  6. Attach 100 kOhm thermistors only to the front of the CI-6527A sensor box and do not have any sensor connected to the 10 kOhm side port.
  7. Attach 10 kOhm thermistors only to the side of the unit.

The specifications of the included thermistors are given below:

10 kOhm Thermistor

  • 10000.0 Ohm at 25 C
  • Accuracy: +/- 0.2 C for (0 - 70C)
  • Range: 0-120 C
  • Resolution: 0.05 °C
  • Repeatability: 0.10 °C
  • Accuracy: 0.5 °C
  • Time constant: 10 s (max)
  • Submergible: Exposed leads need protection from water

100 kOhm Thermistor

  • 100000. Ohm at 25 C
  • Accuracy: +/- 0.2 C for (0 - 70C)
  • Range: 0-120 C
  • Resolution: 0.05 °C
  • Repeatability: 100K: 0.10 °C
  • Accuracy: 0.5 °C
  • Time constant: 10 s (max)
  • Submergible: Exposed leads need protection from water

For submerging in liquids the PS-2153 Stainless Steel Temperature Probe is the preferred sensor, but the PS-2135 PASPORT Fast Response Temperature Probe (3 pack) may also be used. Either of these sensors will plug into the 10 kOhm side port.

Creation Date: 02/17/2006
Last Modified:
Mod Summary: