Updated:2023-11-29
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The CS506 is a fuel moisture sensor that measures the moisture content of the 26601 10-hour fuel moisture stick. The 26601 emulates the moisture content of similarly sized twigs on the forest floor. The CS506/26601 combination is used to assess forest fire fuel and is often incorporated in our prewired or custom fire-weather stations.
The CS506 reports the status of small-diameter (10-hour) forest fire fuels as percent moisture by weight (1%=1 g water/100 g dry fuel). It consists of an epoxy-encapsulated electronics package that uses time-domain reflectometry (TDR) technology to measure the moisture content of the 26601 10-hour Fuel Moisture Stick. The sensor produces a ±0.7 Vdc square-wave frequency that is read using an analog or pulse channel on a Campbell Scientific data logger. The data logger then converts the frequency measurement to percent fuel moisture via a quadratic calibration.
Compatible with most Campbell Scientific data loggers
Companion product to CS205/107 fuel temperature sensor; can be mounted on the same stake
Can automatically monitor changing fuel conditions without having to visit the measurement site
Compatible telemetry options include spread spectrum radios, narrow-band radios, cellular phones, and satellite transmitters
Operating Range | 0 to 70% moisture content |
Power Supply | 5 to 18 Vdc |
Enable Voltage |
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Current Consumption |
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Output Signal | ±0.7 Vdc square wave (with an output frequency of approximately 31 to 58 kHz) |
Dimensions | 10.16 x 6.35 x 1.91 cm (4 x 2.5 x 0.75 in.) |
Weight | < 0.5 kg (< 1 lb) |
Fuel Moisture Accuracy | |
0 to 10% Range |
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10 to 20% Range |
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20 to 30% Range |
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30 to 50% Range |
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