Calibration | 5-5
Initiate Cal and Initiate Verify
Perform an automatic, remote, or manual calibration or verification. These
menu options function almost identically. See the introduction to this
chapter for more information on the difference between a calibration and
a verification.
Automatic calibrations and verifications can also be set to run at prede-
termined frequencies using the cycle times defined in the Set Cal Timers/
Set Auto Timers menu option. Once you set these cycle times, it won’t be
necessary to select the Initiate Cal or Initiate Verify menu options for an
automatic calibration.
The Auto Calibrate/Auto Verify and Remote Calibrate/Remote Verify se-
lections are only available if you have installed an Auto Calibrate Card in
your Series 2000 control unit and have a Remote Calibration Unit (RCU).
If the Series 2000 control unit detects that these options are not installed,
it will automatically prompt you with a manual calibration or verification
operation when you select either the Initiate Cal or Initiate Verify menu
options.
This chapter section is divided into discussions on automatic, remote, and
manual calibrations or verifications.
Auto Calibrate/Auto Verify
Before you can start an auto calibration or verification:
1. Create auto cal timers to tell the system when to perform the automatic
calibrations.
By doing this you don’t have to select the Calibrate key later to run the calibra-
tion, it does it automatically at the frequencies you dened. This is not required
if initiating the auto calibration using a digital input.
2. Enter the calibration gas values to match the span and zero calibration
gas cylinders you will use to calibrate or verify your system.
3. Dene how long you want each calibration gas to ow through the sen-
sor before switching the gases. Remember that with an auto calibration
or verication, the RCU automatically switches the span and zero cali-
bration gases based on the calibration gas duration times you specify.
Be sure to allow enough time for the gases to stabilize when you dene
these times. You may want to use the “Inject Cal Gases” option from
the Calibrate menu to determine how long it takes for gases from the
remote calibration unit (RCU) to reach the sensor and stabilize and then
use these times.
4. Dene a time period for the system to recover from reading calibration
gas values to reading process gases.
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