41
Lite will automatically request the calibration gas for the
next sensor to be calibrated.
Note: If multiple cylinders of calibration gas are
used during calibration, it will be necessary to
change cylinders between span adjustments. In
this case the display will indicate the type and
concentration of the next cylinder of calibration gas
to be applied.
Apply 10PPM SO
2
Once the instrument detects the proper gas, the
instrument will proceed to automatically calibrate the
sensor channel.
SO
2
Sensor
Reading 10
When all sensors currently recognized have been
successfully span-calibrated, the instrument will display
“Auto Calibration Completed” and proceed to shut itself
off.
After shut down, remove all gas fittings from the PhD
Lite, and disconnect the regulator from the calibration
gas cylinder. Then press the MODE button to turn the
instrument on and resume normal operation.
Note: It is possible to exit the automatic span
calibration sequence at any time prior to completion
by pressing and holding down the MODE button to
turn the instrument off. The instrument will retain
the updated settings for those sensors whose span
adjustments have been successfully completed.
Sensors that were not successfully adjusted at the
time the auto-calibration sequence was terminated
will trigger a “Needs Cal” message at the time the
instrument is next turned on. The accuracy of those
remaining sensors should be verified by exposure
to known concentration test gas before the
instrument is put back into service.
4.5 Manual calibration
It is possible to calibrate the PhD Lite manually by using
the navigation arrows to enter the Calibration Menu and
to then select the desired calibration procedure.
4.5.1
Manual fresh air calibration procedure
In some cases, it will be necessary to manually fresh air
calibrate the PhD Lite. Manual fresh air calibrations are
performed as follows:
1. Turn the instrument on and wait at least three
minutes to allow sensor readings to stabilize fully
before initiating any calibration procedures.
2. Make sure the instrument is located in an area
where the air is known to be fresh.
3. Enter the Main Menu as described in section 3.1
above.
ALARMS
CALIBRATION
OPTIONS
SCREEN
VIEW
TIME
EXIT
4. Use the navigation arrows to select CALIBRATION
and then press the MODE button.
FRESH_AIR
REMIND
SPAN_CAL
HISTORY
GAS_VALUES
LAST_CAL
IQ LINK
EXIT
5. Use the navigation arrows to highlight FRESH_AIR
and press the MODE button.
Do Zero Cal Now?
YES
NO
6. Press the MODE button with YES highlighted to
initiate the zero calibration.
Zero Calibration
Please Wait
Zero Calibration
Completed
7. After the completion of the fresh air calibration the
PhD Lite will automatically return to the Main Menu.
ALARMS
CALIBRATION
OPTIONS
SCREEN
VIEW
TIME
EXIT
8. Press the MODE button with EXIT highlighted to
return to the current gas readings screen.
4.5.1.1 Shortcuts to the manual fresh air
calibration procedures
There are two additional ways to reach the manual fresh
air calibration procedure detailed above.
4.5.1.1.1 Shortcut to fresh air calibration while in
normal operation
At the current gas readings screen in Basic, Basic/Peak
or Technician mode, press and hold the left navigation
arrow for six seconds until the PhD Lite instructs you to
release it.
Release Button
Do Zero Cal Now?
YES
NO
The instrument will then proceed directly to the manual
fresh air calibration detailed above in section 4.5.1.
Note: If no action is taken within fifteen seconds of
entering the “Do Zero Cal Now?” screen, the
instrument will automatically return to the current
gas readings screen.
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