Concept
Campbell Scientific (Goodrich) 0871LH1 freezing rain sensor
| URI | http://vocab.nerc.ac.uk/collection/L22/current/TOOL1855/1/ | ||
|---|---|---|---|
| Within Vocab | SeaVoX Device Catalogue | ||
| Alternative Labels | Campbell Scientific 0871LH1 | ||
| Definition | A freezing rain sensor originally manufactured by Goodrich. It is used to detect the presence if icing conditions for the prevention of damage to power lines, to warn of icy road hazards, and prevention of ice build-up on wind turbine blades or aeroplane wings. The 0871LH1 uses resonant frequencies to determine the presence of icing conditions. Its main component is a nickel alloy rod that has a natural resonant frequency of 40 kHz. As ice collects on the rod, the added mass causes the resonant frequency to decrease. When the frequency decreases to 130 Hz (or 0.02 inch layer of ice), an internal heater automatically defrosts the sensor. It can operate in two modes; Sensing mode, where it operates with no ice or with probe ice thickness below the set point; De-icing mode, where it operates with probe ice thickness exceeding the set point. It has a built-in test (BIT) feature which is performed on initial power-up and continually. It features RS-422 output and operates at 9600 bps. It has an operating temperature range from -55 to +71 degC and an operating voltage from 18 to 29.5 Vdc. It has a maximum power draw of 5 W in sensing mode and 27 W in de-icing mode. | ||
| Date | 2022-10-11T15:48:13 | ||
| Identifier | SDN:L22::TOOL1855 | ||
| Note | accepted | ||
| Is Version Of | TOOL1855 | ||
| version | 1 | ||
| Broader | L05:381 |
precipitation gauges | |
| Related | B75:ORG00414 |
Campbell Scientific | |
L35:MAN0089 |
Campbell Scientific | ||
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