biosystems PhD Lite User Manual

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Figure 4.4.2 Typical calibration set-up.
The PhD Lite automatically recognizes the type of gas
supplied and displays the current reading for each
sensor that may be calibrated using the current gas
mixture. The span adjustment process from this point
on is automatic and requires no user input.
Please Wait
If multi-component calibration gas is being used, the
following sequence will be shown.
Multi Cal Gas
Detected
LEL Sensor
Reading 48
Once the readings stabilize, the PhD Lite will
automatically adjust itself so that the sensor readings
match the expected gas concentration values as they
appear in the gas values subdirectory of the calibration
menu.
LEL Set to 50
MAX ADJUSTMENT 171
Note: The max adjustment value shown is an
indication of the relative health of the sensor. As a
sensor loses sensitivity, the maximum adjustment
level will approach the calibration gas
concentration.
Once the LEL sensor is adjusted, the instrument will
move on to the next sensor and perform a similar
adjustment.
CO Sensor
Reading 52
CO Set to 50
MAX ADJUSTMENT 181
Once the span-calibration is successfully completed, the
instrument will show the following screen prior to turning
itself off.
Auto Calibration
Completed
Begin Shut Down
Please Wait
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: If the MODE button is pressed at any time
prior to completion of the calibration, the calibration
procedure will be cancelled and the instrument will
return to normal operation.
Wait at least 3 minutes after
turning the instrument on to allow sensor readings
to stabilize fully before initiating any calibration
procedures. Failure to wait three minutes before
initiating calibration procedures may lead to
inaccurate and potentially dangerous readings.
Make sure the regulator,
cylinder seating surfaces and threads are clean and
dry before attaching the regulator to the cylinder of
gas. Introduction of contaminants through the
regulator fittings may alter or degrade the
concentration of the gas contained in the cylinder
and may lead to inaccurate and potentially
dangerous gas readings.
CAUTION: The use of regulators with on/off
valves may introduce contaminants into the gas
cylinder and may lead to the breakdown of reactive
gases prior to the cylinder expiration date.
Biosystems strongly recommends the use of
continuous fixed-flow regulators for all calibration
procedures.
Use of non-standard calibration
gas and/or calibration kit components when
calibrating the PhD Lite may lead to dangerously
inaccurate readings and may void the standard
Biosystems warranty.
4.4.3 Automatic span calibration with more than
one gas cylinder
Depending on the sensor configuration of the PhD Lite,
it may be necessary to use more than one cylinder of
calibration gas to complete the calibration.
Apply Gas
MODE = Cancel
The PhD Lite will automatically recognize the type of
gas that is applied and proceed with the span calibration
of the sensor(s) that react to the gas. Once that/those
sensor(s) have been successfully calibrated, the PhD

biosystems PhD Lite Specifications

General

Brand	biosystems
Model	PhD Lite
Category	Security Sensors
Language	English