B b sensors ff 20ma int teo humidity sensor duct mounting 12 to 24v dc b b sensors ff 20ma int te0 this industrial humidity measuring probe has a robust design that makes it suitable for continuous operation the probe uses a capacitive polymer sensor element for precise and stable measurement the measured value is linearised and temperature compensated and the probe is protected against overvoltage and transients the stainless steel tube is made pressure tight up to 500 mbar against ambien