Gold-plated probes have 5 µm diameter, 3 mm long platinum-plated tungsten wire sensors. The wire ends are copper- and gold-plated to a thickness of 15 to 20 µm, leaving an active sensor, 1.25 mm, on the middle of the wire.
Fiber-film probes have cylindrical thin film sensors and may be used as a substitute for wire probes in liquids or in gas applications where more robust probes are needed. They are considerably more rugged than wire probes and less sensitive to contamination. Fiber sensors are 70 µm diameter quartz fibers, 3 mm long, covered by a nickel thin film approx. 0.1 µm in thickness.
Single-sensor film probes have non-cylindrical sensors and are used for measurements in liquids at low and medium velocities and in gases. They are considerably more rugged than wire probes and less sensitive to contamination. Sensors are nickel films placed on quartz substrates. The sensor is defined as a line or a ring. Two sputtered silver leads carry the current from the cable, normally attached to the probe body, forward to the sensor.
The supports consist of a coupling ring with an internal rubber ring that provides a water- and pressure-tight sealing, and one set of contacts embedded in a cylindrical body that ends in one PTFE-coated cables with detachable BNC connector. Outside probe support diameter is 4 mm.
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