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Most are used to monitor temperature conditions, and some versions can also measure the relative humidity. Data loggers are often small enough to be placed inside an insulated shipping container or directly attached to a product inside a refrigerator truck or a refrigerated container. These monitor the temperature of the product being shipped.
The ice on the probe matches the reading to the saturation humidity with respect to ice at that temperature, i.e. the frost point. However, a conventional hygrometer is unable to measure properly under the frost point, and the only way to go around this fundamental problem is to use a heated humidity probe. [13]
A TDR waveguide with exposed wires. In the waveform analysis a sensor (usually a probe) is placed in the material to be tested. The sensor contains a waveguide consisting of two, three, or more parallel wires which is connected via a coaxial cable to a voltage pulse generator which sends precisely defined voltage pulses into the sensor.
The simplest resistance-thermometer configuration uses two wires. It is only used when high accuracy is not required, as the resistance of the connecting wires is added to that of the sensor, leading to errors of measurement. This configuration allows use of 100 meters of cable. This applies equally to balanced bridge and fixed bridge system.
The second type of moisture meter relies on the dielectric properties of wood. The meter incorporates two pads which serve as rubber electrodes that transmit and receive a signal when pressed into the wood substrate. The pad type moisture meter is non-invasive in nature and requires only surface contact with the wood to obtain a reading.
Greg Glatzmaier, at the National Renewable Energy Laboratory, determines the high-temperature thermal and mechanical stability of sealants used in a lab prototype of the integrated hydrogen sensor separator module. A hydrogen sensor is a gas detector that detects the presence of hydrogen.
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