3-6 | Thermox Series 2000 WDG-IV / IVC / IVCM
Probe Heater Installation
Do not install the probe heater if your sample gas contains a poten-
tially explosive mixture of combustibles; the probe heater can heat the
flue gas to the point of ignition.
The probe heater must be connected to the sensor before mounting the
sensor to the process.
For installations where a standard setup allows the sample gas to cool
below its acid dewpoint before reaching the sensor, you can attach the
optional probe heater to the probe heater port on the backplate of the
sensor to heat the sample gas - see Figure 3-3. This will prevent plugged
plumbing due to condensation of the sample gas. For example, when a
fuel containing only a few thousand parts per million of sulfur is burned
with a high level of excess oxygen (over 4 percent), the resulting sulfuric
acid mist may condense at temperatures as high as 175 °C.
The probe heater comes shipped in an envelope, is 8.5” long, has a 3/8
NPT bushing and wires leading out of it.
TERMINAL BOX
PROBE HEATER PORT
(REMOVE PLUG)
SAMPLE PROBE
INLET PORT
EXHAUST PORT
Figure 3-3. Port locations on rear of sensor - front view.
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