The CVC/GTC-036 Tube contains a heater element and a thermocouple to read out the heater temperature, and hence infer the pressure. As the pressure in the sensor tube decreases, a rise in temperature occurs since less gas is present to dissipate the heater’s energy. The thermocouple senses the temperature change and a temperature dependent output is produced. This output is used to drive a microampmeter scaled in pressure units. The sensing element is housed in a welded nickel-plated, mild-steel envelope. These versatile sensors provide consistent readings and are easily adapted to electronic outputs.