Campbell 109 User Guide
Model 109 Temperature Probe
Revision: 12/10
Copyright © 1983-2010
Campbell Scientific, Inc.
Warranty and Assistance
The MODEL 109 TEMPERATURE PROBE 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. The customer shall assume all
costs of removing, reinstalling, and shipping defective products to Campbell
Scientific, Inc. Campbell Scientific, Inc. will return such products by surface
carrier prepaid. This warranty shall not apply to any Campbell Scientific, Inc.
products which have been subjected to modification, misuse, neglect, accidents
of nature, or shipping damage. This warranty is in lieu of all other warranties,
expressed or implied, including warranties of merchantability or fitness for a
particular purpose. Campbell Scientific, Inc. is not liable for special, indirect,
incidental, or consequential damages.
Products may not be returned without prior authorization. The following
contact information is for US and International customers residing in countries
served by Campbell Scientific, Inc. directly. Affiliate companies handle
repairs for customers within their territories. Please visit
www.campbellsci.com to determine which Campbell Scientific company
serves your country.
To obtain a Returned Materials Authorization (RMA), contact Campbell
Scientific, Inc., phone (435) 753-2342. After an applications engineer
determines the nature of the problem, an RMA number will be issued. Please
write this number clearly on the outside of the shipping container. Campbell
Scientific's shipping address is:
CAMPBELL SCIENTIFIC, INC.
RMA#_____
815 West 1800 North
Logan, Utah 84321-1784
For all returns, the customer must fill out a “Declaration of Hazardous Material
and Decontamination” form and comply with the requirements specified in it.
The form is available from our website at
completed form must be either emailed to repair@campbellsci.com
435-750-9579. Campbell Scientific will not process any returns until we
receive this form. If the form is not received within three days of product
receipt or is incomplete, the product will be returned to the customer at the
customer’s expense. Campbell Scientific reserves the right to refuse service on
products that were exposed to contaminants that may cause health or safety
concerns for our employees.
www.campbellsci.com/repair
. A
or faxed to
109 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.......................................................................2
3. Installation....................................................................3
3.1 Air Temperature........................................................................................3
3.1.1 Siting...............................................................................................3
3.1.2 Assembly and Mounting.................................................................3
3.2 Soil Temperature ......................................................................................5
3.3 Water Temperature...................................................................................5
4. Wiring............................................................................5
5. Programming ...............................................................6
5.1 CRBasic....................................................................................................6
5.1.1 CRBasic Examples..........................................................................6
5.1.1.1 Sample Program for CR200(X) Series Datalogger...............7
5.1.1.2 Sample Program for CR1000 Datalogger..............................7
5.2 Edlog.........................................................................................................8
5.2.1 Example Edlog Programs................................................................8
5.2.1.1 Example Program for CR10X...............................................8
5.3 Electrical Noisy Environments...............................................................10
5.4 Long Lead Lengths.................................................................................10
6. Measurement Details.................................................10
7. Maintenance and Calibration....................................11
8. Troubleshooting ........................................................12
Figures
2-1. Steinhart and Hart....................................................................................2
2-2. Possible Errors.........................................................................................3
3-1. 109 and 41303-5A Radiation Shield on a Tripod Mast...........................4
3-2. 109 and 41303-5A Radiation Shield on a CM200 Series Crossarm .......4
6-1. 109 Thermistor Probe Schematic............................................................9
i
109 Table of Contents
Tables
1-1. Recommended Cable Lengths................................................................ 1
4-1. Connections to Campbell Scientific Dataloggers................................... 5
5-1. Wiring for Example Programs................................................................ 6
5-2. Wiring for Example Programs................................................................ 8
ii
Model 109 Temperature Probe
1. General
The 109 probe uses a thermistor to measure temperature. It is designed for use
with the CR200(X) series datalogger, which has a special instruction, the
Therm109, for measuring it. The Therm109 instruction is also available for
the CR800, CR850, CR1000, and CR3000 dataloggers. The probe can be
measured with other Campbell Scientific dataloggers using generic
measurement instructions.
The 109 Temperature Probe can measure air/soil/water temperatures. For air
temperature, a 41303-5A radiation shield is used to mount the 109 probe and
limit solar radiation loading. The probe can be buried in soil or submerged in
water to 50 ft (21 psi).
The -L portion of the probe’s model number indicates that the cable length is
user specified. This manual refers to the sensor as the 109.
Cable length for the 109 is specified when the sensor is ordered. Table 1-1
gives the recommended cable length for mounting the sensor on a tripod or
tower.
TABLE 1-1. Recommended Cable Lengths
2 m Height Atop a tripod or tower via a 2 ft crossarm such as the CM202
Mast/Leg CM202 CM6 CM10 CM110 CM115 CM120 UT10 UT20 UT30
9 ft 11 ft 11 ft 14 ft 14 ft 19 ft 24 ft 14 ft 24 ft 37 ft
Note: Add two feet to the cable length if you are mounting the enclosure on the leg base of a light-weight tripod.
The 109 ships with:
(1) Resource CD
1.1 Specifications
Sensor: BetaTherm 10K3A1 Thermistor
Temperature
Measurement Range: -50° to +70°C
Thermistor Inter-
changeability Error: Typically <±0.2°C over 0° to 70°C; ±0.5 @ -50°C
Temperature
Survival Range: -50° to +100°C
Linearization Error: The Steinhart and Hart equation used to calculate
temperature is fit to the range of 0 to 70°C; maximum
error is 0.03°C at -50°C.
1
Model 109 Temperature Probe
NOTE
2. Accuracy
Time Constant
In Air: Between 30 and 60 seconds in a wind speed of 5 m s
-1
Maximum Lead Length: 1000 ft.
®
The black outer jacket of the cable is Santoprene
rubber. This
compound was chosen for its resistance to temperature extremes,
moisture, and UV degradation. However, this jacket will
support combustion in air. It is rated as slow burning when
tested according to U.L. 94 H.B. and will pass FMVSS302.
Local fire codes may preclude its use inside buildings.
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 -50° to 70°C
and ±0.25°C over the range of -10°C to 70°C. The major error component is the
interchangeability specification of the thermistor. The bridge resistor has a 0.1%
tolerance with a 10 ppm temperature coefficient. Figure 2-2 shows the possible
worst case probe and measurement errors. Note that at temperature extremes the
possible error in the CR200(X) measurement may be greater than the error that
may exist in the probe.
Steinhart & Hart - Tabulated values
0.03
0.025
0.02
0.015
0.01
Error Degrees C
0.005
0
-50 -40 -30 -20 -10 0 10 20 30 40 50 60 70
-0.005
Temperature Degrees C
FIGURE 2-1. Steinhart and Hart
2
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