Carrier DATACOLD 500 T/R - Manual (Page 28)

Enclosure D Failure codes & Set correction factor procedure
If the display shows one of the following values:
OC
(I) the input is activated but no sensor is connected.
(ii) the sensor has an open circuit (sensor or wire failure.)
SC
(I) the sensor has a short (sensor or cable failure.)
Procedure to set a Correction factor
The DataCOLD 500 R/T recorders have an option to adjust the offset of the A/D converter with a
correction factor. Because this offset is subject to aging it is recommended to repeat this
procedure on a regular basis (i.e. at the annual reference check).
The correction factor is a fixed parameter used in the formula which converts the measured
resistance into the corresponding temperature. This procedure is not applicable for calibrating
individual sensors. Note that the effect on the measured and displayed Temperature is not linear.
Page 28 62-61138-20 (02/03)
Set the correction factor
• Connect to Temperature input 1 a precision resistor
of 1500 Ω (0,1%).
Parameter Settings
ENTER PINCODE
****
1 2 3 4
• Enter the parameter menu by pressing the green
button for 2 seconds. The display will show: "ENTER
PINCODE". The factory setting of the pin code is
1111.
• After entering the correct pin code you have access
to the parameter menu’s. Select menu 10.6 and
press [edit].
10.5 Corr.factor
Recommended: +2
Setting: +1
< > ACCEPT <-CNCL
• The recorder will now compare the measured value
of the resistor with the ‘expected’ value of 1500 Ω.
• The second line the recorder will display a
recommended correction factor based on the
measured value. This factor can be set on line three.
• After pressing ‘accept’ this correction factor will be applicable for all Temperature inputs. The
correction factor is limited from -9 to +9.