Ametek Thermox WDG-V, User Manual

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2-10 | Thermox WDG-V / VC / VCM with Blow Back
Temperature Sensors
There are two tightly controlled temperature zones in the WDG-V. The
Oxygen Cell Temperature and the combustible block temperature (CM
units only). (On oxygen-only units the box temperature is controlled with
an RTD mounted on the aspirator block.)
Cell Temperature
The oxygen cell is controlled to 680 °C. The cell temperature is measured
by dual, Type K thermocouples. Dual thermocouples are used for self
check of the cell temperature. The thermocouples are collocated in a
single assembly. There is no distinction between the two thermocouples
as they are effectively at the same location in the assembly.
Flow Sensor Heater Element (Black Wire)
Flow Sensor Sense Element (Brown Wire)
Combustible/Box Temperature
The combustible block/ box temperature is controlled to 225 °C. This
temperature is measured by 100 Ohm platinum RTD. The RTD is embed-
ded in the combustible block. On oxygen only units, the RTD is mounted
on the aspirator block. All internal plumbing components are maintained
above 200 °C.
Blow Back Thermostat
Located in the blow back enclosure to control temperature to 150 °C.
Heaters
There are three main heaters in the WDG-V, the cell heater the sensor box
heater and the blow back box heater. In CM units, an additional heater is
used for fine temperature control of the combustible block.