The ST probe incorporates a long life steel sheath especially formulated for carburising atmospheres. The electrode connections, contact springs and proprietary seal are designed for accuracy and reliability under the most severe conditions of atmosphere and thermal cycling.
Probes are normally available in lengths up to 1200 mm, or 2000 mm on special order.
The standard configuration includes a K-type thermocouple of 1.0 mm wire gauge, saving the need for a separate thermocouple.
The signal from the probe is the same as for all standard zirconia oxygen probes. The ST probe is compatible with all common carbon potential controllers. At most, a simple change of connection plug or socket might be required.
ST Probe, showing electrical connector and reference air connector. The standard sheath size is 3/4" schedule 40, but 1/2" schedule 40 is also available.
The probe can be installed anywhere in the kiln or furnace, provided that the temperature is less than 1000 deg C. The probe will measure the oxygen concentration at the probe tip. The port for installation should be sealed sufficiently to prevent atmospheric air from causing a local variation in the oxygen concentration.
When fitting or removing a probe with a hot furnace, move the probe slowly to avoid thermal shock of the ceramic components. Slide the probe in at a rate of approximately 50 mm per minute. The rate is most easily regulated with probes incorporating a thermocouple. The thermocouple read-out can be used to ensure that the heating rate is less than 100 deg C per minute.
The probes must be provided with a reference air supply of 1 to 10 ml per minute.
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