Safety Certification:
Tetra is classified to both US and Canadian standards by
Underwriter Laboratories Inc as suitable for use in Class 1
Groups A, B, C, D.Division I locations. Before use read the
manual to ensure a full understanding of how to operate
the unit and as to any limitations of use.
Warning
• To avoid possible personal injury:
• Substitution of components may impair intrinsic safety.
• Do not use the detector if it is damaged or something
is missing, contact Crowcon immediately.
• Use only sensor modules specifically designed for your
Tetra. (Please see the section on replacement parts and
accessories.)
• Periodically, “bump test” the sensor with gas to confirm
its ability to respond to gas by exposing the detector to
a targetted gas concentration that exceeds the high
alarm setpoint. Manually verify that the audible and
visual alarms are activated.
• It is recommended that the detector be calibrated
before first-time use, and then at least once every 90
days and only by qualified personnel.
• For use in potentially explosive atmospheres where oxy-
gen concentrations do not exceed 21%(v/v).
• Do not turn off the detector during a work shift.
Turning off the detector resets the time weighted aver-
age gas exposure values to zero.
• Ensure that the sensor is not blocked.
• Only the combustible gas detection portion of this
instrument has been assessed for performance on
methane according to C22.2 No.152.
• High off-scale %LEL readings may indicate an explosive
concentration.
• Protect the combustible gas sensor from exposure to
lead compounds, silicones and chlorinated hydrocar-
bons. Although certain organic vapors (such as leaded
gasoline and halogenated hydrocarbons) may tem-
porarily inhibit sensor performance, in most cases the
sensor will recover after calibration.
• It is recommended that the combustible gas sensor be
checked with a known concentration of calibration gas
after any exposure to catalyst contaminations/poisons
(sulfur compounds, silicon vapors, halogenated com-
pounds etc.)
• Only charge the battery using a Crowcon supplied
charger.
• Do not use any other charger. Other chargers may dam-
age the detector making it unsafe for use in hazardous
areas.
• Do not change or charge batteries in a hazardous loca-
tion. Doing so may lead to fire or explosion.
• Extended exposure of the combustible sensor to certain
concentrations of combustible gases and air may stress
the sensor element, which can seriously affect its per-
formance. If an alarm occurs due to a high concentra-
tion of combustible gases, recalibration should be per-
formed, or if needed, the sensor replaced.
• Do not test the combustible sensor’s response using a
butane lighter. Doing so may damage the sensor.
• Prior to each days usage, sensitivity must be tested on a
known concentration of methane equivalent to 25-
50% of full scale concentration (accuracy must be with-
in 0±20% of actual). Accuracy may be corrected by
recalibrating the instrument.
• Any rapid up-scale reading followed by a declining or
erratic reading may indicate a gas concentration beyond
the upper scale limit, which may be hazardous.
Caution
CAUTION: For safety reasons this equipment must be
operated and serviced by qualified personnel only. Read
and understand instruction manual completely before
operating or servicing.
ATTENTION: Pour des raisons de sécurité, cet équipement
doit être utilisé, entretenu et réparé uniquement par un
personnel qualifié. Étudier le manuel d’instructions en
entir avant d’utiliser, d’entretenir ou de réparer
l’équipement.
To avoid damage to the detector:
• Do not expose the detector to electrical shock or severe
mechanical shock.
• Do not attempt to disassemble, adjust or service the
detector unless instructions for that procedure are con-
tained in the manual and/or that part is listed as a
replacement part. Only use Crowcon replacement parts.
• Do not immerse the detector in liquids.
• The detector warranty will be voided if customer per-
sonnel or third parties damage the detector during
repair attempts. Non-Crowcon repair/service attempts
void this warranty.
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