Model 109SS Temperature Probe 9/08 C o p y r i g h t © 1 9 8 3 - 2 0 0 8 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 109SS TEMPERATURE PROBE FOR HARSH ENVIRONMENTS 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.
109SS 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............................................................................................2 2. Accuracy.......................................................................3 3. Installation and Wiring ........................
Model 109SS Temperature Probe 1. General The –L portion of this probe’s model number indicates the probe has a userspecified lead length. For readability purposes, the probe will be referred to as the 109SS throughout this document. The 109SS consists of a thermistor encased in a stainless-steel sheath. The rugged stainless-steel sheath protects the thermistor allowing the 109SS to be buried or submerged in harsh, corrosive environments. It also has a fast time response.
Model 109SS Temperature Probe 1.1 Specifications Temperature Range: -40° to +70°C Survival Range: -50° to +100°C (thermistor); -50°C to +70°C (overmolded joint and cable) Thermistor Interchangeability Tolerance: Temperature Tolerance -40°C ±0.6°C 0°C ±0.38°C 25°C ±0.1°C 50°C ±0.3°C 70°C ±0.45°C Time Constant: Fluid Still Air Air @ 3 meter/second Antifreeze/Water Rolling τ 31 seconds 7.5 seconds 0.
Model 109SS Temperature Probe 2. Accuracy The overall probe accuracy is a combination of the thermistor's interchangeability specification and the accuracy of the bridge resistor. The Steinhart and Hart equation used to calculate temperature has a negligible error (Figure 2-1). In a "worst case" the errors add to an accuracy of ±0.6°C over the range of -40° to 70°C and ±0.49°C over the range of -20°C to 70°C. The major error component is the interchangeability specification (tolerance) of the thermistor.
Model 109SS Temperature Probe 3. Installation and Wiring 3.1 Burial The 109SS is suitable for shallow burial only. It should be placed horizontally at the desired depth to avoid thermal conduction from the surface to the thermistor. Placement of the cable inside a rugged conduit may be advisable for long cable runs, especially in locations subject to digging, mowing, traffic, use of power tools, or lightning strikes. 3.2 Submersion The 109SS can be submerged to 50 ft.
Model 109SS Temperature Probe The datalogger is programmed using either CRBasic or Edlog. Dataloggers that use CRBasic include our CR200-series, CR800, CR850, CR1000, CR3000, CR5000, and CR9000(X); see Section 5.1. Dataloggers that use Edlog include our CR10, CR10(X), CR23X, and CR7; refer to Section 5.2. CRBasic and Edlog are included in our LoggerNet, PC400, and RTDAQ software. If applicable, please read “Section 5.3—Electrical Noisy Environments” and “Section 5.
Model 109SS Temperature Probe 5.1.1.1 Sample Program for CR200 Series Datalogger 'CR200 Series Datalogger ‘This example program measures a single 109SS Thermistor Probe ‘once a second and stores the average temperature every 10 minutes.
Model 109SS Temperature Probe 5.1.1.3 Sample Program for CR5000 'CR5000 'This example program measures a single 109 Thermistor probe 'once a second and stores the average temperature every 10 minutes. 'Declare the variable for the temperature.
Model 109SS Temperature Probe Example Program for CR10X ;{CR10X} ; *Table 1 Program 01: 1 Execution Interval (seconds) 1: AC Half Bridge (P5) 1: 1 Reps 2: 25 2500 mV 60 Hz Rejection Range 3: 1 SE Channel 4: 1 Excite all reps w/Exchan 1 5: 2500 mV Excitation 6: 1 Loc [ V_Vx ] 7: 1.0 Mult 8: 0.
Model 109SS Temperature Probe 9: Z=X+F (P34) 1: 8 2: -273.15 3: 9 X Loc [ Tk ] F Z Loc [ Air_Temp ] 10: If time is (P92) 1: 0 Minutes (Seconds --) into a 2: 10 Interval (same units as above) 3: 10 Set Output Flag High (Flag 0) 11: Real Time (P77) 1: 110 Day,Hour/Minute (midnight = 0000) 12: Average (P71) 1: 1 Reps 2: 9 Loc [ Air_Temp ] *Table 2 Program 02: 0.0000 Execution Interval (seconds) *Table 3 Subroutines End Program 5.
Model 109SS Temperature Probe 1: Excite-Delay (SE) (P4) 1: 1 Reps 2: 25 2500 mV 60 Hz Rejection Range (Delay must be zero) 3: 1 SE Channel 4: 1 Excite all reps w/Exchan 1 5: 2 Delay (0.01 sec units) 6: 2500 mV Excitation 7: 3 Loc [V_Vx ] 8: .0004 Multiplier 9: 0.0 Offset 6. Measurement Details Understanding the details in this section are not necessary for general operation of the 109SS Probe with CSI's dataloggers.
Model 109SS Temperature Probe The resistance of the thermistor is: ⎛V ⎞ Rt = 24,900⎜ EX − 1⎟ ⎝ V ⎠ The Steinhart and Hart equation is used to calculate temperature from Resistance: TK = 1 A + B ln( RT ) + C (ln( RT ))3 Where TK is the temperature in Kelvin. The Steinhart and Hart coefficients used in the Therm109 instruction are: A = 1.129241x10-3 B = 2.341077x10-4 C = 8.775468x10-8 7. Maintenance and Calibration The 109SS Probe requires minimal maintenance.
Model 109SS Temperature Probe Symptom: Unstable Temperature Try using the 60 or 50 Hz integration options, and/or increasing the settling time as described in Sections 8 and 9. Make sure the clear shield wire is connected to datalogger ground, and the datalogger is properly grounded.
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