Probes monitor temperature and humidity
A
Lee-Dickens product story
Edited by the Engineeringtalk editorial team
Sep 20, 2007
The duct and wall mounting HP700 and HP800 probes suit air conditioning ducts, environmental chambers, drying tunnels, clean rooms, laboratories, computer rooms and storage areas.
Lee-Dickens has released two low-cost relative humidity and temperature probe ranges.
The HP700 and HP800 series are high-accuracy duct and wall mounting environmental probes for measuring relative humidity and/or temperature in applications such as air conditioning ducts, environmental chambers, drying tunnels, clean rooms, laboratories, computer rooms and storage areas.
The probes, which use a capacitive sensor, operate as either two-wire transmitters or transducers and have a variety of output types that can be configured at the time of order.
These include a 4 to 20mA, 0 to 1mA or 0 to 1V DC output proportional to 0 to 100% relative humidity (0 to 100C for temperature), with accuracy less than +/-2.0% for 0 to 95% relative humidity and less than +/-0.3C for temperature.
Each output can be fed from a separate power supply if loop isolation is required.
Both models are housed in a tough polycarbonate enclosure and have a polycarbonate cage to protect the sensor.
Sintered bronze or stainless steel guards can be fitted if required.
The nonprocessor-based electronics are extremely reliable and suitable for use in operating temperatures of -10 to +70C.
The sensor on the duct-mounted HP700 series has an operating temperature range of -10 to +100C.
The method of duct mounting the HP700 series is by compression fitting or by a Table E flange.
The standard probe length is 225mm, but other lengths are available.
A range of power options are available for both series including 100-120V AC or 200-240V AC, 9-30V DC, and 10-48V DC loop supply.
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