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Campbell TEMPERATURE PROBE 109SS manual

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Table of contents for the manual

  • Page 1

    Model 109SS Temperature Probe Revision: 12/10 Copyright © 1983-2010 Campbell Scientific, Inc.[...]

  • Page 2

    Warranty and Assistance The MODEL 109SS TEMPERATURE PROBE FOR HARSH ENVIRONMENTS is warranted by Campbell Scientific, Inc. to be free from defects in mat erials and workma nship under normal use and servi ce for twelve (12) months from date of shipm ent unless specified otherwi se. Batteri es have no warranty. Cam pbell Scienti fic, Inc. 's ob[...]

  • Page 3

    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...................................................................[...]

  • Page 4

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  • Page 5

    Model 109SS Temperature Probe 1. General The –L portion of this probe’s m odel number i ndicates the probe has a user- specified lead length. For readab ility purposes, the pro b e will be referred to as the 109SS throughout this docum ent. The 109SS consists of a thermistor encas ed in a stainless-steel sheath. The rugged stainless-steel sheat[...]

  • Page 6

    Model 109SS Temperature Probe 1.1 Specifications Temperature Range: -40° to +70°C Survival Range: -50° to +100°C (thermist or); -50°C to +70°C (overm olded 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 τ St[...]

  • Page 7

    Model 109SS Temperature Probe 2. Accuracy The overall probe accuracy is a combinati on of the thermi stor's interchangeability specification and the accuracy of the bri dge resistor. The Steinhart and Hart equation used to calculate temperature has a negl igible error (Figure 2-1). In a "worst case" the errors add to an accuracy of ?[...]

  • Page 8

    Model 109SS Temperature Probe 3. Installation and Wiring 3.1 Burial The 109SS is suitable for shallow burial onl y. It should be placed horizontally at the desired depth to avoid thermal conduction from the surface to the thermistor. Placem ent of the cable in side a rugged conduit may be advisable for long cable runs, especially in locations subje[...]

  • Page 9

    Model 109SS Temperature Probe The datalogger is programme d using eith er CRBasic or Edlog. Dataloggers that use CRBasic include our CR200( X)-series, CR800, CR850, CR1000, CR3000, CR5000, and CR9000(X); see Section 5.1. Dataloggers t hat use Edlog include our CR10, CR 10(X), CR23X, and CR7; refer t o Section 5.2. CRBasic and Edlog are included in [...]

  • Page 10

    Model 109SS Temperature Probe 5.1.1.1 Sample Program for CR200(X) Series Datalogger 'CR200(X) Seri es Datalogger ‘This example program measures a single 109SS Thermist or Probe ‘once a second and stores the aver age temperature every 10 minutes. ‘Declare the variable for th e temperature measurement Public Air_Temp ‘Define a data table[...]

  • Page 11

    Model 109SS Temperature Probe 5.1.1.3 Sample Program for CR5000 'CR5000 'This example program measures a single 109 Thermist or probe 'once a second and stores the aver age temperature every 10 minutes. 'Declare the variable for the temperature. Public Air_Temp 'Declare variables for the raw measurement, t hermistor resista[...]

  • Page 12

    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 Reject ion Range 3: 1 SE Channel 4: 1 Excite all reps w/Exchan 1 5: 2500 mV Excitati on 6: 1 Loc [ V_Vx ] 7: 1.0 Mult 8: 0.0 Offset 2: Z=1/X (P42) 1: 1 X Loc [ V_Vx ] 2: 2 Z Loc [...]

  • Page 13

    Model 109SS Temperature Probe 9: Z=X+F (P34) 1: 8 X Loc [ Tk ] 2: -273.15 F 3: 9 Z Loc [ Air_Temp ] 10: If tim e is (P92) 1: 0 Minutes (Seconds --) into a 2: 10 Interval (same uni ts as above) 3: 10 Set Output Flag Hi gh (Flag 0) 11: Real Tim e (P77) 1: 110 Day,Hour/Minut e (midni ght = 0000) 12: Average (P71) 1: 1 Reps 2: 9 Loc [ Air_Temp ] *Table[...]

  • Page 14

    Model 109SS Temperature Probe 1: Excite-Delay (SE) (P4) 1: 1 Reps 2: 25 2500 mV 60 Hz Rejecti on Range (Delay m ust be zero) 3: 1 SE Channel 4: 1 Excite all reps w/Exchan 1 5: 2 Delay (0.01 sec units) 6: 2500 mV Excitati on 7: 3 Loc [V_Vx ] 8: .0004 Multiplier 9: 0.0 Offset 6. Measurement Details Understanding the detail s in this section are not n[...]

  • Page 15

    Model 109SS Temperature Probe The resistance of the thermistor is: ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ − = 1 900 , 24 V V R EX t The Steinhart and Hart equation i s used to calculate temperature from Resistance: 3 )) (ln( ) ln( 1 T T K R C R B A T + + = Where T K is the temperature in Kelvin . Th e Steinhart and Ha rt coefficients used in the Therm109 instru[...]

  • Page 16

    Model 109SS Temperature Probe 12 Symptom: Unstable Tem perature Try using the 60 Hz o r 50 Hz integratio n options, and /o r increasing the settling time as descri bed in Sections 8 and 9. Make sure the clear shi eld wire is connected to datalogger ground, and the dat alogger is properly grounded.[...]

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  • Page 18

    Campbell Scientific Companies Campbell Scientific, Inc. (CSI) 815 West 1800 Nort h Logan, Utah 84 321 UNITED STATES www.campbellsci.com • info@cam pbellsci.com Campbell Scientific Afri ca Pty. Lt d. (CSAf) PO Box 2450 Somerset West 7129 SOUTH AFRICA www.csafrica.co .za • cleroux@csafrica.co.za Campbell Scientific Aust ralia Pty. Ltd. (CSA) PO B[...]