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Chapter 1. Calibration
1.5 Calibrating RTD Inputs
RTD analog inputs may be added to the XGM868i by installing an appropriate option card in Slot 1. The option card
contains two or four RTD inputs that are designated as A, B, C and D. Both the set point and slope point values for each
input must be specified prior to use.
1.5.1 Preparing for Calibration
Prepare for the calibration procedure by connecting the RTD temperature transmitter to the desired input (A, B, C or D)
on the option card. See Figure 4 on page 12 to identify the RTD(+) and COM(-) pins for the desired input on terminal
block J2.
1.5.2 Accessing the Calibration/Test Menu
1. From the Keypad Program, press the right arrow key to scroll to the CALIB menu. Press [Enter].
2. In the Cal window, scroll to Slot 1. Press [Enter].
Note: The Slot 1 option only appears at the above prompt if an option card is installed in this slot.
3. Scroll to the desired Input. (
When calibrating the other inputs, be sure to reconnect the current source at terminal block J2. See
IMPORTANT:
Figure 4 on page 12 for the correct pins.
1.5.3 Entering the Set Point
1. Before proceeding, place the RTD in a temperature bath and allow it to stabilize at the desired set point
temperature.
2. Scroll to Set to program the RTD set point. Press [Enter].
3. Use the arrow keys to enter the desired set point temperature and press [Enter].
4. Scroll to STORE to accept the new set point value or ABORT to cancel the entry. Press [Enter].
1.5.4 Entering the Slope
1. Scroll to Slope to program the RTD slope point. Press [Enter].
2. Use the arrow keys to enter the desired slope point temperature and press [Enter].
3. Press STORE to accept the new slope point value or ABORT to cancel the entry. Press [Enter].
Note: If an error message appears, verify that the RTD is at the programmed temperature. Also, if you replace the
set/slope range with a different range, be sure to recalibrate the set and slope points.
Procedure Options
This completes calibration of the Slot 1 RTD input. Do one of the following:
•
To calibrate or test another input, press [Escape] and return to Step 3 in Accessing the Calibration/Test Menu
above.
•
To leave the Keypad Program, press [Escape] twice.
6
will be used as an example in this manual.) Press [Enter].
Input A
DigitalFlow™ XGM868i Service Manual
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