9
1.5.5 Other alarms and special microprocessor
features
PhD Lite software includes a number of additional alarms
designed to ensure the proper operation of the instrument.
When the PhD Lite detects that an electronic fault or
failure condition has occurred, the proper audible and
visible alarms are activated and an explanatory message
is displayed.
The PhD Lite is designed to detect
potentially life threatening atmospheric conditions.
Any alarm condition should be taken seriously. The
safest course of action is to immediately leave the
affected area, and return only after further testing
determines that the area is once again safe for entry.
1.6 Other electronic safeguards
Several automatic programs prevent tampering and
misuse of the PhD Lite by unauthorized persons. Each
time the detector is turned on, the PhD Lite automatically
tests the LED alarm lights and audible alarm. The battery
is monitored continuously for proper voltage. The PhD
Lite also monitors the connection of sensors that are
currently installed. The detection of any electronic faults
causes the activation of the audible and visible alarms and
causes the display of the appropriate explanatory
message.
1.6.1 Security beep
The PhD Lite offers a security beep that may be
configured to “beep” at defined intervals to indicate that
the instrument is turned on.
Optional set-up choices, including security beep
settings, are accessed through the Options Menu.
See section 3.4.3 for details on the security beep.
1.7 Classification for intrinsic safety
The PhD Lite has the following certifications for intrinsic
safety:
UL Class I, Division 1, Groups A, B, C, and D
UL Class ll, Division 1, Groups E, F, and G
CSA Class I, Division 1, Groups A, B, C, and D
ATEX Certification:
II 2G EEx ia d IIC T4 (Alkaline) / EEx ia d IIC T3 (NiMH)
UL International DEMKO A/S 03 ATEX 130960X
The PhD Lite is also CE-Marked (Conformité
Européenne). The UL, CSA, and ATEX certification
marks indicate compliance with United States,
Canadian, and European Community requirements.
These classifications extend to instrument when
operated with the motorized pump.
1.8 Sensors
The PhD Lite can be configured to simultaneously monitor
Oxygen, combustible gases and vapors and either one or
two toxic gases. Up to three sensors can be installed in
the PhD Lite. With the “Duo Tox” dual channel CO/H
2
S
sensor installed, the instrument is capable of displaying
readings for up to four different channels of detection: O
2
,
LEL, CO, and H
2
S. The sensor configuration of the PhD
Lite can be specified at the time of purchase, or changed
in the field by appropriately trained personnel.
A sensor that cannot be
calibrated or is found to be out of tolerance must 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.
Calibration procedures are discussed in detail in
Chapter 4.
1.9 Continuous sample draw pump
An optional slip-on, motorized sample-draw pump is
available for situations requiring continuous "hands free"
remote monitoring.
The pump contains a pressure sensor that detects
restrictions in airflow caused by water or other fluids
being drawn into the unit and immediately acts to turn the
pump off in order to protect the sensors, pump, and other
PhD Lite components from damage.
Pump status is continuously monitored by the PhD Lite
microprocessor. A spinning “
” icon located in the upper
left hand corner of the LCD display indicates that the
pump is attached and in normal operation. Low flow or
other pump fault conditions activate audible and visible
alarms and cause the display of the appropriate
explanatory message.
1.10 Black box data recorder
Starting with instrument firmware version 1.29, every
PhD Lite purchased without a datalogger has included a
“black box” data recorder that functions similarly to a
datalogger, with one important distinction. The data
stored in a PhD Lite with a datalogger option can be
accessed directly by the user with Biosystems’ Biotrak
Database Software. Instruments with the black box data
recorder must be sent back to Biosystems for data
retrieval.
If the data stored in a PhD Lite equipped with a black box
data recorder is needed, simply call Biosystems’
Instrument Service Department at (860) 344-1079 for a
return authorization number and send the instrument
back to Biosystems. Biosystems will extract the data
from the instrument and print an incident report at no
charge. You only pay for shipping.
Datalogging functions are discussed in detail in
Chapter 5.
1.11 Remote Vibrating Alarm
The PhD Lite can be equipped with an optional remote
vibrating alarm for use in noisy environments. The MHP-
1 or MHP-2 remote alarm is designed to be worn on a
belt or shirt collar or placed inside a pocket, and is
connected to the instrument via a 20" or 40" cable.
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