Vandagraph R-17VAN Sensor
Replacement Sensor for Vandagraph VN202 and TEK-OX
Compatible with:
Vandagraph VN202
Vandagraph TEK-OX
MSA MiniOx
Dive Rite VTI
Teledyne AD300
Teledyne MD300
The galvanic sensor is a complete self contained unit which, once the chemicals are exhausted, is discarded and replaced.The basic constituents of a sensor are a lead anode and a gold plated cathode with potassium hydroxide as an electrolyte.The cathode is a convex disk with numerous perforations which is plated with a metal such as gold, silver, platinum etc.
When Oxygen is diffused through the membrane, into the sensor, the lead is oxidised into lead oxide and the reaction produces a small current between the anode and the cathode.The lead anode is specially designed to maximise the amount of metal available for the reation. For this reason it is not solid lead, but is made of small particles bonded together. This increases the surface area in contact with the electrolyte.
The rear of the sensor has another flexible membrane which is designed to accommodate internal volume changes that occur throughout the life of the sensor.
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