INSTRUCTION MANUAL 108-LC Temperature Probe for MetData1 Revision: 4/03 C o p y r i g h t ( c ) 1 9 8 5 - 2 0 0 3 C a m p b e l l S c i e n t i f i c , I n c .
Warranty and Assistance The MODEL 108-LC TEMPERATURE PROBE FOR METDATA1 is warranted by CAMPBELL SCIENTIFIC, INC. to be free from defects in materials and workmanship under normal use and service for twelve (12) months from date of shipment unless specified otherwise. Batteries have no warranty. CAMPBELL SCIENTIFIC, INC.'s obligation under this warranty is limited to repairing or replacing (at CAMPBELL SCIENTIFIC, INC.'s option) defective products.
108-LC Table of Contents PDF viewers note: These page numbers refer to the printed version of this document. Use the Adobe Acrobat® bookmarks tab for links to specific sections. 1. General ........................................................................1 1.1 Specifications............................................................................................1 2. Accuracy .....................................................................1 3. Installation and Wiring .........................
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Model 108-LC Temperature Probe for MetData1 1. General The 108 Air/Soil/Water Temperature Probe uses thermistors to measure temperature. Custom lead lengths are available up to 1000 ft. For air temperature measurement, a 41303 radiation shield is needed to mount the 108 Probe and limit solar radiation loading of the 108. The 108 probe is designed to be buried or submerged in water up to 100 feet. 1.
Model 108-LC Temperature Probe for MetData1 TABLE 2-1. Thermistor Interchangeability Specification Temperature (°C) −10 0 to +50 +70 +90 Temperature Tolerance (±°C) 0.25 0.20 0.20 0.31 TABLE 2-2. Polynomial Error -10 to +95 -7 to +95 -3 to +90 <±1.0°C <±0.5°C <±0.1°C TABLE 2-3. Actual Temperature, Sensor Resistance, and Computed Temperature Temperature °C -10.00 -8.00 -6.00 -4.00 -2.00 0.00 2.00 4.00 6.00 8.00 10.00 12.00 14.00 16.00 18.00 20.00 22.00 24.00 26.00 28.00 30.00 32.00 34.00 36.00 38.
Model 108-LC Temperature Probe for MetData1 52.00 54.00 56.00 58.00 60.00 62.00 64.00 66.00 68.00 70.00 72.00 74.00 76.00 78.00 80.00 82.00 84.00 86.00 88.00 90.00 92.00 94.00 96.00 98.00 100.00 30983 28595 26413 24419 22593 20921 19388 17981 16689 15502 14410 13405 12479 11625 10837 10110 9438.1 8816.9 8241.9 7709.7 7216.3 6758.9 6334.5 5940.5 5574.3 52.03 54.03 56.03 58.02 60.01 61.99 63.98 65.97 67.96 69.96 71.97 73.98 75.99 78.01 80.02 82.03 84.04 86.03 88.00 89.96 91.89 93.80 95.67 97.51 99.
Model 108-LC Temperature Probe for MetData1 3. Installation and Wiring The 108 must be housed inside a radiation shield when used in the field for air temperature measurement. The 41303 Radiation Shield (see Figure 3-1) mounts to a CM6 or CM10 tripod. The UT018 mounting arm and UT6P Radiation Shield are used to mount the 108 to a UT30 tower. The standard lead length of 6 feet and 9 feet allow the 108 to be mounted at a 2 meter height on the CM6/CM10 tripod or the UT30 tower respectively. FIGURE 3-1.
Model 108-LC Temperature Probe for MetData1 5. Programming NOTE Information in this section is not necessary when programming the MetData1 with the Short Cut Program Builder software. Instruction 5 (AC Half Bridge) is used to measure the 108 temperature probe. Instruction 55 (polynomial) is used to find the temperature in degrees Celsius.
Model 108-LC Temperature Probe for MetData1 For most applications it is unnecessary to calibrate the 108 to eliminate the thermistor offset. However, for those users that are interested, the following briefly describes calibrating the 108 probes. A single point calibration can be performed to determine the 108 temperature offset (thermistor interchangeability). This calibration will not remove the polynomial error.
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