INSTRUCTION MANUAL Model 107 Temperature Probe Revision: 3/14 C o p y r i g h t © 1 9 8 3 - 2 0 1 4 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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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. Introduction ................................................................. 1 2. Cautionary Statements ............................................... 1 3. Initial Inspection ......................................................... 1 4. Quickstart .................................................................... 1 5. Overview ...........
Table of Contents B. Example Programs.................................................. B-1 B.1 B.2 Example CRBasic Program ............................................................. B-1 Example Edlog Program.................................................................. B-1 C. Resistance or Voltage Ratio to Temperature ....... C-1 Figures 6-1. 7-1. 7-2. 8-1. Linearization error, where error is the difference between actual and datalogger computed temperature. .....................................
Model 107 Temperature Probe 1. Introduction The 107 Temperature Probe uses a thermistor to measure temperature in air, soil, and water. It is compatible with all Edlog and CRBasic dataloggers except the CR200(X) and CR9000(X). See Section 6, Specifications, for a complete list of compatible dataloggers. 2. Cautionary Statements Santoprene® rubber, which composes the black outer jacket of the 107 cable, will support combustion in air.
Model 107 Temperature Probe 2 2. The Short Cut installation should place a shortcut icon on the desktop of your computer. To open Short Cut, click on this icon. 3. When Short Cut opens, select New Program. 4. Select Datalogger Model and Scan Interval (default of 5 seconds is OK for most applications). Click Next.
Model 107 Temperature Probe 5. Under the Available Sensors and Devices list, select the Sensors | Temperature folder. Select 107 Temperature Probe. Click to move the selection to the Selected device window. Data defaults to degree Celsius. This can be changed by clicking the Deg C box and selecting Deg F, for degrees Fahrenheit, or K for Kelvin. 6. After selecting the sensor, click at the left of the screen on Wiring Diagram to see how the sensor is to be wired to the datalogger.
Model 107 Temperature Probe 5. 8. If LoggerNet, PC400, RTDAQ, or PC200W is running on your PC, and the PC to datalogger connection is active, you can click Finish in Short Cut and you will be prompted to send the program just created to the datalogger. 9. If the sensor is connected to the datalogger, as shown in the wiring diagram in step 6, check the output of the sensor in the datalogger support software data display to make sure it is making reasonable measurements.
Model 107 Temperature Probe Edlog Temp (107) (P11) Polynomial Linearization Error: <±0.1 °C (–24 to 48 °C) <±0.5 °C (–35 to 50 °C) FIGURE 6-1. Linearization error, where error is the difference between actual and datalogger computed temperature.
Model 107 Temperature Probe 7.1 Wiring to Datalogger TABLE 7-1. Wire Color, Function, and Datalogger Connection 7.2 Wire Color Wire Function Datalogger Connection Terminal Black Voltage-excitation input EX, VX (voltage excitation) Red Analog-voltage output SE (single-ended, analog-voltage input) Purple Bridge-resistor lead AG or (analog ground) Clear EMF shield G (power ground) Datalogger Programming Short Cut is the best source for up-to-date datalogger programming code.
Model 107 Temperature Probe 7.2.1 CRBasic The Therm107() measurement instruction programs CRBasic dataloggers (CR800-series, CR1000, CR3000, CR5000) to measure the 107 probe. It supplies a 2500 mV excitation, makes a half-bridge resistance measurement, and converts the result to temperature using the Steinhart-Hart equation (see Section 8.
Model 107 Temperature Probe Standard air temperature measurement heights: • • • 1.25 to 2.0 m (WMO) 2.0 m (EPA) 2.0 m and 10.0 m temperature difference (EPA) When exposed to sunlight, the 107 should be housed in a 41303-5A or 413035B six-plate solar radiation shield. The louvered construction of the shields allows air to pass freely through, thereby keeping the probe at or near ambient temperature. The white shields reflect solar radiation.
Model 107 Temperature Probe Tripod Mast or Tower Leg 41303-5A 107 CM200 Series Crossarm FIGURE 7-2. 107 and 41303-5A Radiation Shield on a CM200 Series Crossarm The 107 is held within the radiation shield by a mounting clamp on the bottom plate of the 41303-5A (FIGURE 7-2). Loosen the two mounting clamp screws, and insert the probe through the clamp and into the shield. Tighten the screws to secure the sensor in the shield, and route the sensor cable to the instrument enclosure.
Model 107 Temperature Probe 8. Operation 8.1 Sensor Schematic FIGURE 8-1. 107 thermistor probe schematic 8.2 Measurement and Output Linearization Campbell Scientific dataloggers measure the 107 probe thermistor and convert the result to temperature. With reference to the previous FIGURE 8-1, 107 thermistor probe schematic, a precise excitation voltage is applied at the Vx line and the voltage drop across the 1 kΩ resistor is measured at the Vs line.
Model 107 Temperature Probe TABLE 8-1.
Model 107 Temperature Probe 8.3 Electrically Noisy Environments EMF noise emanating from the ac mains power grid can be a significant source of measurement error. 60 Hz noise is common in the United States. 50 Hz noise is common in Europe and other regions. Depending on the datalogger model, this noise can usually be filtered out. The following code examples filter 60 Hz noise. The key parameters are in bold type. CRBasic Therm107(T107_C,1,1,Vx1,0,_60Hz,1.0,0.
Model 107 Temperature Probe CRBasic For CRBasic dataloggers, the 60 Hz and 50 Hz integration options include a 3 ms settling time; longer settling times can be entered into the Settling Time parameter. The following example uses a 20000 µs settling time. Therm107(T107_C,1,1,1,20000,_60Hz,1.0,0.0) Edlog The 60 Hz and 50 Hz rejection options for the CR10X, CR510, and CR23X include a delay to accommodate long cable lengths.
Model 107 Temperature Probe Symptom: Temperature is reported as –86 (°C) or –53 (°F). Verify the black wire is connected to the switched excitation channel as specified by the measurement instruction. Symptom: Incorrect temperature is reported. Verify the multiplier and offset arguments in the measurement instructions are correct for the desired units (Section 7.2, Datalogger Programming). Check the cable for signs of damage and possible moisture intrusion. Symptom: Unstable temperature is reported.
Appendix A. Importing Short Cut Code This tutorial shows: • • How to import a Short Cut program into a program editor for additional refinement. How to import a wiring diagram from Short Cut into the comments of a custom program. A.1 Importing Short Cut Code into a Program Editor Short Cut creates files that can be imported into either CRBasic Editor or Edlog program editor. These files normally reside in the C:\campbellsci\SCWin folder and have the following extensions: • • • • • • .
Appendix A. Importing Short Cut Code 6. Import wiring information to the program by opening the associated .DEF file. Copy and paste the section beginning with heading “-Wiring for CRXXX–” into the CRBasic program, usually at the head of the file. After pasting, edit the information such that a ' character (single quotation mark) begins each line. This character instructs the datalogger compiler to ignore the line when compiling the datalogger code. A.1.
Appendix B. Example Programs B.1 Example CRBasic Program This example can be used directly with CR800 series, CR1000, CR3000, and CR5000 dataloggers. 'Program measures one 107 temperature probe once a second and 'stores the average temperature every 60 minutes.
Appendix B. Example Programs ;{CR10X} ;Program measures one 107 temperature probe once a second ;and stores the average temperature every 60 minutes. ;Wiring Diagram ;============== ;107 Probe ; ; Wire ; Color Function ; -----------; Black Voltage-excitation input ; Red Analog-voltage output ; Purple Bridge-resistor ground ; Clear Shield CR10X -----E1 SE1 AG G *Table 1 Program 01: 1.
Appendix C. Resistance or Voltage Ratio to Temperature TABLE C-1.
Appendix C.
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