All of the components exposed to the high temperature gases are ceramic or platinum, for optimum corrosion resistance. It is of robust construction, with an alumina ceramic sheath to protect the sensing element.
| Model | Range (°C) | Sheath | Diameter (mm) | Thermocouple |
| HT | 700 - 1700 | ceramic | 17 | type R |
The probe can be installed anywhere in the kiln or furnace, provided that the temperature at the tip is between 700 deg C and 1700 deg C. The probe will measure the oxygen concentration at the probe tip.
The port for installation should be sealed sufficiently to avoid atmospheric air from flowing inwards and causing a local variation in the oxygen concentration.
The probe can be used at any orientation for temperatures up to 1100 deg C, but should hang vertically if used at higher temperatures.
The probe head should be maintained at a temperature less than 60 deg C.
Clean respirable reference air at a rate of 10 cm3/min must be supplied to the connection provided on the probe head.
The electrical connections are:
| Pin 1 | Pt/Pt13%Rh leg of R-type thermocouple |
| Pin 2 | Pt leg of R-type thermocouple |
| Pin 3 | Oxygen sensor internal conductor |
| Pin 4 | Oxygen sensor external conductor |
The oxygen signal is according to the Nernst equation
pO2 = 0.209 exp(-46.42E/T)
where
pO2 = oxygen partial pressure in atmospheres
E = oxygen signal in mV
T = temperature in Kelvin
There are no user serviceable parts inside the probe. If the external platinum conductor is broken, it can normally be rejoined without loss of accuracy.
For further information or a price quotation, please enquire, specifying length required, to Australian Oxytrol Systems or use the online Enquiry Form
Probes are normally ready for despatch by international air freight within one week of order.
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