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Chapter 2. Basic operation
This chapter will cover how to use the PhD Lite for safe
work in potentially hazardous atmospheres.
2.1 Operational warnings and cautions
1.
The PhD Lite personal,
portable gas detector has been designed for the
detection of dangerous atmospheric conditions.
An alarm condition indicates the presence of a
potentially life-threatening hazard and should
be taken very seriously.
2.
In the event of an alarm
condition it is important to follow established
procedures. The safest course of action is to
immediately leave the affected area, and to
return only after further testing determines that
the area is once again safe for entry. Failure to
immediately leave the area may result in serious
injury or death.
3.
Use only Duracell MN1500
or Ultra MX1500, Eveready Energizer E91-LR6,
Eveready EN91, Radio Shack 23-874 (not ATEX
approved) size AA 1.5V Alkaline batteries,
Eveready CH15 (not ATEX approved) or Radio
Shack 23-149 (not ATEX approved) size AA 1.2V
NiCad batteries, or Eveready L91 size AA 1.5V
Lithium batteries (not CSA or ATEX approved).
Substitution of batteries may impair intrinsic
safety.
4.
The accuracy of the PhD
Lite should be checked periodically with known
concentration calibration gas. Failure to check
accuracy can lead to inaccurate and potentially
dangerous readings. (The Canadian Standards
Association (CSA) requires an accuracy check
using known concentration calibration gas prior
to each day’s use.)
5.
The accuracy of the PhD
Lite should be checked immediately following
any known exposure to contaminants by testing
with known concentration test gas before
further use. Failure to check accuracy can lead
to inaccurate and potentially dangerous
readings.
6.
A sensor that cannot be
calibrated or is found to be out of tolerance
should be replaced immediately. An instrument
that fails calibration may not be used until
testing with known concentration test gas
determines that accuracy has been restored,
and the instrument is once again fit for use.
7.
Do not reset the calibration
gas concentration unless you are using a
calibration gas concentration that differs from
the one that is normally supplied by Biosystems
for use in calibrating the PhD Lite.
Customers are strongly urged to use only
Biosystems calibration materials when
calibrating the PhD Lite. Use of non-standard
calibration gas and/or calibration kit components
can lead to dangerously inaccurate readings and
may void the standard Biosystems warranty.
8.
Use of non-standard
calibration gas and/or calibration kit
components when calibrating the PhD Lite can
lead to inaccurate and potentially dangerous
readings and may void the standard
Biosystems warranty.
Biosystems offers calibration kits and long-
lasting cylinders of test gas specifically
developed for easy PhD Lite calibration.
Customers are strongly urged to use only
Biosystems calibration materials when
calibrating the PhD Lite.
9.
Substitution of components
may impair intrinsic safety.
10.
For safety reasons this
equipment must be operated and serviced by
qualified personnel only. Read and understand
this reference manual before operating or
servicing the PhD Lite.
11.
A rapid up-scale reading
followed by a declining or erratic reading may
indicate a hazardous combustible gas
concentration that exceeds the PhD Lite’s zero
to 100 percent LEL detection range.
12.
Use only the following
chargers to recharge the PhD Lite:
U.S. & Canada: 54-26-0201, 54-26-0202,
54-26-0204
Europe: 54-26-0205, 54-26-0206, 54-26-0207
U.K.: 54-26-0208, 54-26-0209
13.
Use only the following
pumps with the PhD Lite:
54-26-0101 (Standard),
54-26-0102 (Plated)
2.2
On and off sequences
The rectangular push-button on the top of the PhD Lite
case is called the “MODE” button. It is used to turn the
PhD Lite on and off, to initiate the automatic calibration
sequence, and to confirm menu choices.
2.2.1 Start-up
sequence
To turn the PhD Lite on:
1. Press the MODE button once and release it.
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