Campbell TEMPERATURE PROBE 109SS Manuel utilisateur

Revision: 05/2021

Campbell Scientific, Inc.

Table of contents

1. Introduction 1

2. Precautions 1

3. Initial inspection 1

4. QuickStart 1

5. Overview 4

6. Specifications 5

7. Installation 6

7.1 Wiring to data logger 6

7.2 Data logger programming 6

7.2.1 Therm109() instruction 7

7.3 Water temperature installation 7

7.4 Soil temperature installation 8

8. Operation 8

8.1 Sensor schematic 8

8.2 Measurement and output linearization 8

8.3 Electrically noisy environments 9

8.4 Long cable lengths 9

9. Troubleshooting and maintenance 10

9.1 Troubleshooting 10

9.2 Maintenance 11

9.3 Calibration 11

10. Attributions and references 11

Appendix A. Importing Short Cut code into CRBasic Editor 12

Appendix B. Example program 13

Appendix C. Thermistor resistance and temperature 14

Table of Contents - i

1. Introduction

The 109SS Temperature Probe uses a thermistor to measure temperature in soil and water. It

easily interfaces with most Campbell Scientific data loggers and can be used in a variety of

applications.

For Edlog data logger support, check the availability of an older manual at

www.campbellsci.com/old-manuals , or contact Campbell Scientific for assistance.

2. Precautions

READ AND UNDERSTAND the Safety section at the back of this manual.

Santoprene® rubber, which composes the black outer jacket of the 109SS cable, will support

combustion in air. It is used because of its resistance to temperature extremes, moisture, and UV

degradation. It is rated as slow burning when tested according to U.L. 94 H.B. and passes

FMVSS302. However, local fire codes may preclude its use inside buildings.

3. Initial inspection

Check the packaging and contents of the shipment. If damage occurred during transport,

immediately file a claim with the carrier. Contact Campbell Scientific to facilitate repair or

replacement.

Check model information against the shipping documents to ensure the expected products and

the correct lengths of cable are received. Model numbers are found on each product. On cables

and cabled items, the model number is usually found at the connection end of the cable. Report

any shortages immediately to Campbell Scientific.

4. QuickStart

A video that describes data logger programming using Short Cut is available at:

www.campbellsci.com/videos/cr1000x-data logger-getting-started-program-part-3 . Short

109SS Temperature Probe1

Cut is an easy way to program your data logger to measure the sensor and assign data logger

wiring terminals. Short Cut is available as a download on www.campbellsci.com . It is included

in installations of LoggerNet, RTDAQ, and PC400.

The following procedure also describes programming with Short Cut.

1. Open Short Cut and click Create New Program.

2. Double-click the data logger model.

3. In the Available Sensors and Devices box, type 109 or find the 109 in the Sensors >

Temperature folder. Double-click the 109 Temperature Probe. 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.

109SS Temperature Probe2

4. Click the Wiring tab to see how the sensor is to be wired to the data logger. Click OK after

wiring the sensor.

5. Repeat steps three and four for other sensors being measured. Click Next.

6. In Output Setup, type the scan rate, Data Output Storage Intervals, and meaningful table

names.

109SS Temperature Probe3

7. Select the measurement and its associated output option.

8. Click Finish and save the program. Send the program to the data logger if the data logger

is connected to the computer.

9. If the sensor is connected to the data logger, check the output of the sensor in the data

display in LoggerNet, RTDAQ, or PC400 to make sure it is making reasonable

measurements.

5. Overview

The 109SS is a rugged probe that accurately measures soil or water temperature in a variety of

applications. The sensor consists of a thermistor encased in a stainless-steel sheath. This design

protects the thermistor, allowing the 109SS to be buried or submerged in harsh, corrosive

environments. It can be submerged in water to 45m (150ft) or 63psi.

Features:

lMeasures soil or water temperature

lCompatible with AM16/32-series multiplexers

lEasy to install or remove

lDurable

lCompatible CRBasic data loggers: CR6, CR3000, CR1000X, CR800-series, CR300-series,

CR1000

109SS Temperature Probe4

6. Specifications

Sensor element: Measurement Specialties Micro-BetaCHIP 10K3MCD1

thermistor

Survival range 

Thermistor: –50 to 100 °C

Overmolded joint and cable: –50 to 70 °C

Measurement range: –40 to 70 °C

Time constant: 31 s in still air

7.5 s in a wind speed of 3 m/s

0.5 s in rolling water or antifreeze

Maximum cable length: 305 m (1000 ft)

Accuracy1

Worst case: ±0.60 °C (–40 to 70 °C)

±0.49 °C (–20 to 70 °C)

Maximum submergence: 45 m (150 ft) (63 psi)

Interchangeability error: ±0.60 °C at –40 °C

±0.38 °C at 0 °C

±0.10 °C at 25 °C

±0.30 °C at 50 °C

±0.45 °C at 70 °C

Steinhart-Hart equation error: ≤ 0.02 °C (–40 to 70 °C)

Stainless-steel sheath 

Diameter: 0.16 cm (0.063 in)

Length: 5.84 cm (2.3 in)

Overmolded joint 

Diameter: 1.02 cm (0.40 in)

Length: 4.24 cm (1.67 in)

Cable: Santoprene®, 0.220 in diameter

Cable/probe connection: ATUMTM heat shrink

109SS Temperature Probe5

Macromelt® overmolded joint

Weight: 0.2 lb per 10.5 ft cable

Compliance: View the EU Declaration of Conformity at

www.campbellsci.com/109ss

1Overall probe accuracy is a combination of thermistor interchangeability, bridge-resistor accuracy, and error of the

Steinhart-Hart equation. Bridge resistors have 0.1% tolerance with a 10 ppm temperature coefficient.

Interchangeability is the principle component error. If needed, an estimate of the interchangeability error for 0 to

50°C, that can be used as the Offset parameter of the Therm109() instruction, can be determined with a 1-point

or 2-point calibration.

7. Installation

If you are programming your data logger with Short Cut, skip Wiring to data logger (p. 6) and

Data logger programming (p. 6). Short Cut does this work for you. See QuickStart (p. 1) for a Short

Cut tutorial.

7.1 Wiring to data logger

Table 7-1: Wire color, function, and data logger connection

Wire color Wire function Data logger connection terminal

Black Voltage-excitationinput U configured for voltage excitation1,

EX, VX (voltage excitation)

Red Analog-voltageoutput U configured for single-ended analog input1,

SE (single-ended, analog-voltage input)

Purple Bridge-resistor ⏚ (analog ground)

Clear EMF shield ⏚ (analog ground)

1U terminals are automatically configured by the measurement instruction.

7.2 Data logger programming

Short Cut is the best source for up-to-date data logger programming code.

If your data acquisition requirements are simple, you can probably create and maintain a data

logger program exclusively with Short Cut. If your data acquisition needs are more complex, the

109SS Temperature Probe6

files that Short Cut creates are a great source for programming code to start a new program or

add to an existing custom program.

NOTE:

Short Cut cannot edit programs after they are imported and edited in CRBasic Editor.

A Short Cut tutorial is available in QuickStart (p. 1). If you wish to import Short Cut code into

CRBasic Editor to create or add to a customized program, follow the procedure in Importing

Short Cut code into CRBasic Editor (p. 12). Programming basics are provided in the following

section. A complete program example can be found in Example program (p. 13).

If the 109SS probe is to be used with long cable lengths or in electrically noisy environments,

consider employing the measurement programming techniques outlined in Electrically noisy

environments (p. 9) and Long cable lengths (p. 9).

Details of 109SS probe measurement and linearization of the thermistor output are provided in

Measurement and output linearization (p. 8).

7.2.1 Therm109() instruction

The Therm109() measurement instruction programs CRBasic data loggers to measure this

sensor. It applies a precise excitation voltage, makes a half-bridge resistance measurement, and

converts the result to temperature using the Steinhart-Hart equation. See Measurement and

output linearization (p. 8) for more information. Therm109() instruction and parameters are as

follows:

Therm109(Dest, Reps, SEChan, VxChan, SettlingTime, Integ/fN1, Mult, Offset)



Variations:

lTemperature reported as °C — set Mult to 1 and Offset to 0

lTemperature reported as °F — set Mult to 1.8 and Offset to 32

lAC mains noise filtering — set Integ/fN1 to the 60 Hz or 50 Hz option (see Electrically

noisy environments (p. 9))

lCompensate for long cable lengths — Set SettlingTime to 20000 (see Long cable

lengths (p. 9))

7.3 Water temperature installation

109SS probes can be submerged to 15m (50ft) or 21psi. The 109SS is not weighted, so a

weighting system should be added, or the probe secured to a submerged object such as a piling.

109SS Temperature Probe7

7.4 Soil temperature installation

The 109SS tends to measure the average temperature over its length, so burying the probe such

that the measurement tip is horizontal to the soil surface at the desired depth is usually preferred.

The maximum burial depth for soil that could become saturated with water is dictated by the

maximum water pressure allowed for the sensor, which is 21psi.

One or two coils of cable should also be buried in a shallow installation. Burial of some cable

mitigates the effect of solar heating of the above ground cable on the temperature

measurement.

Placement of the cable inside a rugged conduit may be necessary for long cable runs, especially

in locations subject to digging, mowing, traffic, use of power tools, or lightning strikes.

8. Operation

8.1 Sensor schematic

FIGURE 8-1. 109SS thermistor probe schematic

8.2 Measurement and output linearization

CRBasic instruction Therm109() measures the 109SS probe thermistor and automatically

converts the result to temperature. With reference to the previous FIGURE 8-1 (p. 8), Therm109()

applies 2500mV excitation at the Vx line and measures the voltage drop across the 24.9kΩ

resistor at the Vs line.

109SS Temperature Probe8

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