EAGLE 2 Operator’s Manual PID Relative Response Feature • 141
PID Relative Response Feature
The relative response feature enables you to change the PID sensor’s
response to gas on the fly so that the PID channel is roughly calibrated to an
alternate gas. This is done by temporarily changing the gas configuration of
the PID channel. You can select from a list of gases whose response relative
to the configured gas, normally isobutylene, is programmed into the EAGLE
2’s memory. For example, if the PID channel is setup for and calibrated to
isobutylene (IBL), you can select isopropyl alcohol (IPA) from a gas list
accessible from the PID Relative Response Screen in Display Mode so that
the PID channel responds to gas as if it were calibrated to isopropyl alcohol.
The EAGLE 2 will clear the gas configuration change when it is turned off
and will return to the programmed configuration when it is turned on again.
The gas list for the relative response feature includes several pre-defined
gases and 1 gas that can be entered into the EAGLE 2 in the field using the
Eagle 2 Maintenance Data Loader Program. The Eagle 2 Maintenance Data
Loader Program Operator’s Manual contains a chart of response factors
relative to isobutylene for many gases. If the desired gas is not in this chart,
gas testing must be performed to determine the gas’ response factor relative
to isobutylene. See the Eagle 2 Maintenance Data Loader Program
Operator’s manual for details regarding the gas testing and programming user
defined gases into the EAGLE 2’s relative response list.
Because of normal variation between sensors, these relative response factors
are typical factors. If you use this feature, the response to the selected gas will
not be as accurate as it would be if you configured and calibrated the PID
channel to the target gas.
For maximum accuracy, configure and calibrate the EAGLE 2’s PID channel
to the desired target gas.
PID Sensor Relative Response Screen in Display Mode
To use the relative response feature for the PID sensor, enter display mode
and select the desired gas as described below:
1. With the EAGLE 2 in Measuring Mode, press and release the DISPLAY
ADJUST NO button repeatedly until you arrive at the PID Sensor
Relative Response Screen.
SELECT
RELATIVE RESPONSE
TO CALIBRATED GAS
FOR PID SENSOR
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