Auto Calibrate/Auto Verify - Ametek Thermox 2000 ATEX Series User Manual

Auto Calibrate/Auto Verify

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5-8 | Thermox Series 2000 WDG-HPII / HPIIC - ATEX
Before you can start an auto calibration or verification, you must do the
following:
Create auto cal timers to tell the system when to perform the auto-
matic calibrations. Note that by doing this you don't have to select
the Calibrate key later to run the calibration, it does it automatically
for you at the frequencies you defined. This is not required if initiat-
ing the auto calibration using a digital input (see the "Remote Cali-
bration Unit Connections" section in the Installation chapter for help
on how to trigger an automatic calibration using a digital input).
Enter the calibration gas values to match the span and zero calibra-
tion gas cylinders you will use to calibrate or verify your system (see
the "Cal Gas Values" section later in this chapter).
Define how long you want each calibration gas to flow through the
sensor before switching the gases (see the "Set Cal Timers/Cal Gas
Duration" section). Remember that with an auto calibration or
verification, the RCU automatically switches the span and zero
calibration gases based on the calibration gas duration times you
specify. Be sure to allow enough time for the gases to stabilize when
you define 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.
Define a time period for the system to recover from reading calibra-
tion gas values to reading process gases (see the "Set Cal Timers/
Recovery Duration" section later in this chapter).
Then you can start the auto calibrate cycle as follows:
Select the Initiate Cal or Initiate Verify option from the Calibrate
key menu, depending on whether you want to perform a calibration
or verification.
Select the Auto Calibrate or Auto Verify option. The system will
begin the automatic calibration, and will notify you how long the
span gas will be applied to the sensor from the RCU:
Span Gas xx:xx
System Calibrating