Baker Hughes Panametrics XDP, User Manual

Page: 39 / 64

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5.3.4 Scheduling AutoCal
To customize the AutoCal process, you must program the
calibration schedule. To do so, proceed as follows:
IMPORTANT
The following steps are required for the AutoCAL process
to function properly. The date and time entered below
are used by the XDP to trigger the initial AutoCAL.
Subsequently, the date and time are updated by the
interval specified below to let the XDP know when to
initiate another AutoCAL.
Failure to program the date and time accurately may
result in AutoCALs occurring at unexpected times.
1. Enable AutoCal as described in “enabling AutoCal”
on page 44 .
2. Use the [

] and [

] keys to highlight the schedule AutoCal
menu option and press [ENTER].
3. Using the four arrow keys, program the date (MM/DD/YY)
on which the first AutoCal will occur. Then, press [ENTER].
4. Using the four arrow keys, program the time (HH:MM in
24-hour mode) at which the first AutoCal will occur.
Then, press [ENTER].
5. Use the [

] and [

] keys to highlight either the days
option or the hours option to specify the unit of measure
for the interval between AutoCals. Press [ENTER].
6. Using the four arrow keys, program the interval
(in the units selected in step 5) between each AutoCal.
Then, press [ENTER].
5.3.5 Indicating an AutoCal
The XDP analog output may be programmed to indicate
that an AutoCal is in progress by forcing it to one of the
following values:
•
Force high - outputs a value equal to the high point of the
selected analog output range (e.g. 20 mA for a 4-20 mA
range).
• Force low - outputs a value equal to the low point of the
selected analog output range (e.g. 4 mA for a 4-20 mA
range).
• Force to value - outputs a preprogrammed value.
• Track cal gas - outputs the current live calibration gas
value
• Hold last value - outputs the last valid measurement prior
to the start of the AutoCal.
To program the manner in which the XDP analog output
indicates an AutoCal in progress, proceed as follows:
1. Enable
AutoCal as described in “enabling AutoCal” on
page 44 .
2. Use the [

] and [

] keys to highlight the Aout indication
menu option and press [ENTER].
3. Use the [

] and [

] keys to highlight the desired analog
output indication method. Press [ENTER].
4. If you selected force high, force low, track cal gas , or
hold last value , the programming is complete. If you
selected force to value , use the four arrow keys to
program the analog output value that should be
forced during an AutoCal. Press [ENTER].
5.3.6 Initiating an AutoCal
In addition to the regularly scheduled AutoCals, you
may manually initiate an AutoCal at any time. To do so,
proceed as follows:
1. Enable
AutoCal as described in “Enabling AutoCal” on
page 44 .
2. Use the [

] and [

] keys to highlight the initiate AutoCal
menu option and press [ENTER].
3. Use the [

] and [

] keys to highlight the yes or no
response to the question about initiating an AutoCal now.
Then, press [ENTER].
If you responded no in step 3, no AutoCal is performed. If you
responded yes in step 3, an AutoCal is initiated immediately.
NOTE: If you attempt to initiate an AutoCal while a regularly
scheduled AutoCal is in progress, the request is ignored.
5.3.7 Setting the AutoCal drift limits
If the calibration drift exceeds the preset drift limits during
an AutoCal, an error condition is indicated via the analog
output error handlers ( see page 4-10 ), if they have been
enabled. To program these maximum calibration drift limits,
proceed as follows:
1. Enable
AutoCal as described in “Enabling AutoCal” on
page 44 .
2. Use the [

] and [

] keys to highlight the AutoCal limits
menu option and press [ENTER].
3. Use the [

] and [

] keys to highlight the max drift/cal
menu option and press [ENTER].
4. Using the four arrow keys, enter the ppm/pcnt value for
the maximum drift since the previous AutoCal that will
not generate an error condition. Press [ENTER].
5. Use the [

] and [

] keys to highlight the max drift/total
menu option and press [ENTER].
6. Using the four arrow keys, enter the ppm/pcnt value
for the maximum drift from this AutoCal that will not
generate an error condition. Press [ENTER].