CS506 Fuel Moisture Sensor Revision: 3/12 C o p y r i g h t © 1 9 9 8 - 2 0 1 2 C a m p b e l l S c i e n t i f i c , I n c .
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CS506 Table of Contents PDF viewers: These page numbers refer to the printed version of this document. Use the PDF reader bookmarks tab for links to specific sections. 1. General Description.....................................................1 2. Specifications ..............................................................1 3. Installation....................................................................2 4. Wiring............................................................................4 5.
CS506 Fuel Moisture Sensor 1. General Description The CS506 Fuel Moisture Sensor provides an automated measurement of the moisture content of a standard 10-hour fuel moisture dowel. The moisture content of the 10-hour fuel sensor represents the moisture content of smalldiameter (10-hour time lag) forest fuels. Traditionally, the standard fuel moisture stick consists of a rack of four 1/2 inch diameter ponderosa pine dowels. The resulting rack is about 20 inches long with an oven-dry weight of 100 grams.
CS506 Fuel Moisture Sensor the media surrounding the stainless steel strips. The dielectric constant is predominantly dependent on the water content of the wood. Digital circuitry scales the oscillation frequency to an appropriate range for measurement with a datalogger. The CS506 output is essentially a square wave with an amplitude of ±0.7 VDC. The frequency of the square wave output ranges from approximately 31 to 58 kHz. Its output period ranges from 17 to 32 μs.
CS506 Fuel Moisture Sensor probe is then inserted into the CS205 stick. Tighten the compression fitting so that it compresses the split wood and snugly holds the 107 probe. The mounting stake ships with a package of three ultraviolet light resistant cable ties. One cable tie passes through the two slots where the fuel moisture stick attaches to the CS506 sensor in order to loosely secure the cable of the CS205/107. The other two cable ties are used to secure both cables to the mounting stake.
CS506 Fuel Moisture Sensor 107 Temperature Probe CS205 10-Hour Fuel Temperature Stick CS506 Fuel Moisture Sensor 26601 Ponderosa Pine Dowel FIGURE 3-2. Front view of the 26817 fuel moisture/temperature mounting stake 4. Wiring Connections to Campbell Scientific dataloggers are given in Table 4-1. When Short Cut for Windows software is used to create the datalogger program, the sensor should be wired to the channels shown on the wiring diagram created by Short Cut. TABLE 4-1.
CS506 Fuel Moisture Sensor 5. Datalogger Programming This section is for users who write their own datalogger programs. A datalogger program to measure this sensor can be created using Campbell Scientific’s Short Cut Program Builder software. You do not need to read this section to use Short Cut. The CS506 has a built in enable circuit. When voltage on the enable lead is less than 1 VDC, the sensor is off. When a voltage greater than 4 VDC, commonly 5 VDC, is applied to the enable lead, the sensor is on.
CS506 Fuel Moisture Sensor 5.1 CR1000 Programming The following program measures a CS506 fuel moisture sensor using the CRBasic PeriodAvg() instruction. See Table 5-1 for wiring details that match this program.
CS506 Fuel Moisture Sensor 5.2 CR10X Programming The following program measures a CS506 fuel moisture sensor using Edlog’s Instruction 27 (Period Averaging). See Table 5-1 for wiring details that match this program. ;{CR10X} ;CR10X Program for CS506 *Table 1 Program 01: 10.
CS506 Fuel Moisture Sensor 8: Polynomial (P55) 1: 1 Reps 2: 1 X Loc [ PA_uS ] 3: 2 F(X) Loc [ FuelM ] 4: -73.797 C0 5: 3.7685 C1 6: 0.0406 C2 7: 0.0 C3 8: 0.0 C4 9: 0.
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