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WARNING

The Probe Heater Assembly is certified for use in hazardous classified areas and is rated T3,

which means that it will not produce surface temperatures higher than 200 °C that could be

an ignition source. This rating, however, is based on the maximum temperature that can be

achieved with energy supplied by its electrical heater. An internal thermal switch disables the

heater at 170 °C. In practice, this is the limiting factor, but those responsible for installation and

maintenance of the overall probe assembly must take other factors into consideration.

Although the maximum process temperatures are stated as 210 °C (standard) and 450 °C (High

Temperature version) these ratings apply to the probe and valve assemblies. In normal installa-

tions, the low sample flow and aspirator operation, combined with simple thermal losses, result

in temperatures well below the dewpoint of the sample, so the heater must be added. However, if

installed incorrectly, the use of external insulation and heat tracing could theoretically combine

with high process temperature and process radiation to drive the surface of the heater assembly

over 200 °C without any internal electrical heating being applied. To ensure this is not the case,

the user must verify that the probe heater is being controlled at its set point and not being in-

fluenced by the process temperature. If the analyzer indicates the temperature is higher than the

setpoint (greater than 170°C), this indicates a problem.

Cautions

Review and follow these Cautions to avoid damaging the equipment.

When working on the analyzer/Heated Acid Gas Sample Probe, all safety policies and proce-

dures for the hazardous area must be strictly followed. These policies and procedures are speci-

fied by the Owner Company and the local electrical inspection authority.

Any electrical connections, adjustments, or servicing of the analyzer/Heated Acid Gas Sample

Probe while it is energized or de-energized should be performed only by properly trained and

qualified personnel using materials and methods specified and approved by the Owner Com-

pany and the local electrical inspection authority.

For electrical-shock protection, the analyzer/Heated Acid Gas Sample Probe must be operated

from a grounded power source that has a securely connected protective-ground contact.

Disconnect the power before removing any components from the analyzer or HAG Probe.

CAUTION

Ametek HAG User Manual

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