Placement and Calibration of Sensors
Calibrating Photo-Ionization Detector (PID) Sensor
EVM Series User Manual
65
NOTE:
A correction factor is a number that relates to the PID sensor of a specific VOC and
correlates to the PID response to the calibration gas (sometimes referred to as a response
factor). Please reference
for specific correction factors provided by Ion
Science.
Performing a PID Span Calibration
Allow up to 15 minutes of warm-up time for PPB PID sensor and 5 minutes for PPM PID sensor. For
PPB span calibration, refer to PID ppb note if the sensor has not been used for over two weeks.
If you are proceeding from the Zero cal section, the screen you will be viewing is the
Calibrate/Pause
screen. (If you closed the screens, refer to the Note in step 1.)
PID Span Cal
1.
From the
PID/Calibrate Pause
screen, press the
Span
soft key on the keypad.
NOTE:
To navigate to the PID Span cal screen, select the
Calibration
screen. Select
PID
using the up/down arrows. Then, press the
Cal
soft key. Zero and Span soft keys will
appear. It will look similar to the screen below but it will not have the intended/actual
zero cal set points displayed. See step 2 to proceed.
Intended and Actual
Zero cal set point results
Span
Figure 4-29: PID Calibration Span soft key
2.
Adjust the span value by pressing
▲
/
▼
Arrows
once the sensor has warmed-up.
3.
Apply
the
gas
at full flow rate while observing the “Level” field on the display. Wait for the current
level to stabilize (allow a couple of minutes).
4.
Press the
Set
soft key (and it will state Cal set point stored).
5.
Once your calibration is completed, a
Save
screen will appear with the details of your parameters.
NOTE:
If you want to repeat the span cal, press cancel and a message will appear stating it is
canceling. Press the
Retry
soft key to repeat the span cal steps.
