Baker Hughes Panametrics XDP, User Manual

Page: 38 / 64

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5.3 Configuring AutoCal
Use the instructions in this chapter to configure the AutoCal process as desired. Begin by navigating to the cal>1:cal>AutoCal
menu. Then, proceed to the next section to begin.
5.3.1 Enabling AutoCal
The first step in configuring AutoCal is to program whether
this process is activated or deactivated. To perform this task,
proceed as follows:
1. At the
AutoCal menu, press [ENTER].
2. Use the [

] and [

] keys to highlight the enable/disable
option and press [ENTER].
3. Use the [

] and [

] keys to highlight either the enable
option or the disable option and press [ENTER].
4. If you chose to disable AutoCal, no additional AutoCal
programming is required. If you chose to enable AutoCal,
continue the programming in the next section.
5.3.2 Selecting the AutoCal type
After enabling AutoCal, the next step is to select the type
of calibration to perform. The following three options are
available:
•
Offset calibration - this is a one-point calibration that
uses an offset correction at one specified ppm/pcnt value.
• Zero/span calibration - this is a two-point calibration that
uses an offset correction at both the zero and span (full-
scale) ppm/pcnt values.
NOTE: The instructions in this manual assume that the
XDP has been programmed to calibrate the zero point
first (see “zero/span cal type” on page 56 ). If your unit is
configured to calibrate the span point first, the option
above will be shown as “span/zero calibration” and steps
5a and 5c on the next page will be reversed.
• Slope calibration - this is a one-point calibration that
uses an offset correction at just the span (full-scale)
ppm/pcnt value.
NOTE: The slope calibration is really just a special case
of the zero/span calibration where there is no offset
correction at the zero point.
To select the AutoCal type, proceed as follows:
1. Enable
AutoCal as described in the previous section.
2. Use the [

] and [

] keys to highlight the AutoCal types
menu option and press [ENTER].
3. Use the [

] and [

] keys to highlight the desired
calibration method and press [ENTER].
Proceed to the appropriate step below for the type of
calibration you chose in step 3 above.
4. For the
offset cal method, proceed as follows:
a. Using the four arrow keys, program the ppm/pcnt
value that you wish to use for the offset correction.
b. Press [ENTER] to complete the programming.
5. For the zero/span cal method, proceed as follows:
a. Using the four arrow keys, program the ppm/pcnt
value that you wish to use for the zero correction.
b. Press [ENTER].
c. Using the four arrow keys, program the ppm/pcnt
value that you wish to use for the span (full-scale)
correction.
d. Press [ENTER] to complete the programming.
6. For the slope cal method, proceed as follows:
a. Using the four arrow keys, program the ppm/pcnt
value that you wish to use for the span (full-scale)
correction.
b. Press [ENTER] to complete the programming.
5.3.3 Setting calibration gas flow times
To optimize the AutoCal process, you may program
the length of the gas flow times during a calibration.
To do so, proceed as follows:
1. Enable
AutoCal as described on page 5-2.
2. Use the [

] and [

] keys to highlight the AutoCal control
menu option and press [ENTER].
3. Use the [

] and [

] keys to highlight the zero gas on time
option and press [ENTER].
4. Using the four arrow keys, program the time in minutes
that you wish to allow for the zero gas to settle.
Press [ENTER].
5. Use the [

] and [

] keys to highlight the span gas on time
option and press [ENTER].
6. Using the four arrow keys, program the time in minutes
that you wish to allow for the span gas to settle.
Press [ENTER].
7. Use the [

] and [

] keys to highlight the gas settling time
option and press [ENTER].
8. Using the four arrow keys, program the time in minutes
that you wish the allow for the process gas to settle.
Press [ENTER].
9. Use the [

] and [

] keys to highlight the gas measuring
time option and press [ENTER].
10. Using the four arrow keys, program the time in minutes
that you wish to allow for the data collection. Then,
press [ENTER].