General Warnings and Cautions
WARNING
1. The monitor and Relay Module described in
this manual must be installed, operated,
and maintained in strict accordance with
the labels, cautions, warnings, instructions,
and within the limitations stated.
2. The standard and rack mount monitor must
not be installed in outdoor areas or in
locations where explosive concentrations of
combustible gases or vapors might occur in
the atmosphere: Class I, Group A, B, C,
and D areas as defined by the NEC.
Because the monitor is not explosion-proof,
it must be located in non-
hazardous areas.
3. The explosion-proof (XP) Chemgard Monitor
meets Class, I, Division 1, Groups B,
C and D. To prevent ignition of a
hazardous atmosphere, the cover of an XP
monitor must be kept tightly closed when
power is applied. Before removing the
cover for maintenance or calibration,
ensure the surrounding atmosphere is and
remains free of toxic or combustible gases
until the cover is closed.
4. The Chemgard Gas Monitor is designed to
detect one particular gas or vapor at
ambient atmospheric pressures. The unit
will not dete
ct gas at elevated temperatures.
5. High levels of or long exposure to certain
compounds in the tested atmosphere may
contaminate the sensor. In atmospheres
where the system may be exposed to such
materials, perform calibration frequently to
ensure dependable system operation and
accurate indications.
6. Do not paint the Chemgard System. Also, do
not paint near any of the sample line inlets
to ensure paint is not deposited on the
sample inlet fitting of the units. Such paint
deposits would interfere with the sampling
process, whereby a sample of the
a
tmosphere being monitored is drawn into
the Chemgard System.
7. The only absolute method to assure the proper
overall operation of a gas detection
instrument is to check it with a known
concentration of the gas for which it has been
calibrated. Consequently, a calibration check
must be included as part of the installation
and as a routine inspection of the system.
8. Perform periodic leak checks on all the sample
lines and all flow system components and
fittings of t
he Chemgard System.
9. Use only genuine MSA replacement parts
when performing any maintenance
procedures provided in this manual. Failure
to do so may seriously impair instrument
performance. Repair or alteration of the
Chemgard System, beyond the scope of
these maintenance instructions or by anyone
other than authorized MSA service
personnel, could cause the product to fail to
perform as designed, and persons who rely
on this product for their safety could sustain
s
erious personal injury or death.
10. Properly vent the exhaust of the Chemgard
System to a safe area. Improper venting of
the exhaust may cause serious personal
injury or death.
11. Ensure the gas sample to the system is
clean and non-condensing. Install
end-of-line filters in all sample inlet lines.
12. Avoid any installation where condensation
may form. Condensation may possibly clog
or block the sampling line; this will prevent
the instrument from receiving new or fresh
gas samples from the area being monitored.
13. The Chemgard Gas Monitor must be
installed, located and operated in
accordance to all applicable codes. These
codes include, but are not limited to, the
National Fire Prevention Code and National
Electric Code.
14. The Chemgard Relay Module must be
connected to proper main voltages.
Connection of improper voltages will cause
the unit to fail. The Chemgard Relay
Module uses the same electrical ground as
the Chemgard Monitor.
15. Protect the Chemgard Relay Module from
vibration (which causes increased noise
level on the instrument) and heating (which
reduces the operating life of instrument);
otherwise, improper operat
ion may occur,
which can result in personal injury or death.
16. Do not exceed the relay contact ratings listed
in Appendix B, TABLE B-1 Otherwise, relay
operation may fail, which can result in
personal injury or death.
Failure to comply with the above warnings
can result in serious personal injury or death.
CAUTION
Do not attempt to modify or adjust the
sensing element.