Chapter 1. Calibration
6
DigitalFlow™ XGM868i Service Manual
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
. (
Input A
will be used as an example in this manual.) Press
[Enter].
IMPORTANT:
When calibrating the other inputs, be sure to reconnect the current source at terminal block
J2
. See
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 t
o 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.
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