5.2
ICTD Temperature Transducer Calibration
Integrated Circuit Temperature Detectors (ICTD) temperature sensors should not be confused with other types
of temperature measuring devices such as RTDs, thermocouples or thermistors.
An ICTD temperature probe consists of an electronic device that is imbedded in the probe which allows a very
small current to pass that is proportional to the temperature of the device. The probe can be calibrated using a
single point calibration method because the rate of change of the current passed through the ICTD vs. the tem-
perature is linear.
1. Ensure that the control panel is in
Service Mode
and the compressor is
Stopped
.
2. Touch the cell associated with the
Measured
value of the sensor in question to bring up the calibration
pad shown below.
fig.116:
Temperature Probe Calibration Pad
3. Open the electrical box of the sensor.
4. Loosen the screw that retains the hold down tab and rotate the tab out of the way.
5. Remove the temperature probe from the well and immerse it in an ice water bath with a calibrated ther-
mometer or digital multimeter attachment.
•
The ice water should be predominantly ice with just enough water to cover the Ice. The temperature
of the ice and water mixture will approach the triple point of the water (~32.02 °F/ 0.01 °C).
6. Allow both devices to stabilize for approximately three minutes in the ice water bath.
7. Record the actual temperature on the thermometer or multimeter.
•
If a calibrated measurement device is not available, the channel should be calibrated to 32.0 °F/ 0.0
°C once the reading has stabilized.
8. Use the keypad to enter the recorded value for the sensor. Maximum and minimum limits will be set
automatically by taking the current reading and respectively adding and subtracting ten percent of the
sensor´s range.
•
Maximum and minimum values are displayed at the bottom of the keypad display. If the recorded
value falls outside these bounds, it is an indication that the transducer may be damaged, incorrectly
wired or of the wrong type.
9. Complete calibration for the sensor by touching the
Enter
button.
Sensor Calibration
ICTD Temperature Transducer Calibration
Instruction Manual | GEA Omni™
Control panel
226
GEA Refrigeration North America, Inc. | E_806550_2 | Generated 12.01.2016
Содержание Omni
Страница 1: ...Control panel GEA Omni Instruction Manual E_806550_2 ...
Страница 238: ......