Campbell 107 User manual

Model 107 Temperature Probe
Revision: 10/08
Copyright © 1983-2008
Campbell Scientific, Inc.

Warranty and Assistance
The MODEL 107 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 [phone]. 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 www.campbellsci.com/repair. A
completed form must be either emailed to [email protected] or faxed
to 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.
CAMPBELL SCIENTIFIC, INC. does not accept collect calls.

107 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
5.2 Edlog.........................................................................................................6
5.3 Example Programs....................................................................................6
5.3.1 Example Program for CR1000 Datalogger.....................................7
5.3.2 Example Program for CR10X Datalogger......................................7
5.4 Electrically Noisy Environments..............................................................8
5.5 Long Lead Lengths...................................................................................8
6. Measurement Details...................................................9
6.1 Therm107 Instruction...............................................................................9
6.2 Temp(107) Instruction (P11)..................................................................10
7. Maintenance and Calibration....................................12
8. Troubleshooting ........................................................12
Figures
2-1. Error Produced by Polynomial fit to Published Values...........................3
3-1. 107 and 41303-5A Radiation Shield on a Tripod Mast...........................4
3-2. 107 and 41303-5A Radiation Shield on a CM200 Series Crossarm.......4
6-1. 107 Thermistor Probe Schematic ..........................................................10
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107 Table of Contents
ii
Tables
1-1. Recommended Lead Lengths ................................................................. 1
2-1. Thermistor Interchangeability Specification........................................... 2
2-2. Polynomial Error for Edlog Dataloggers................................................ 2
4-1. Connections to Campbell Scientific Dataloggers................................... 5
5-1. Wiring for Example Programs................................................................ 6
6-1. Polynomial Coefficients ....................................................................... 10
6-2. Temperature, Resistance, and Datalogger Output................................ 11

Model 107 Temperature Probe
1. General
The 107 Temperature Probe uses a thermistor to measure temperature. The
probe is designed for measuring air/soil/water temperatures. For air
temperature, a 41303-5A radiation shield is used to mount the 107 Probe and
limit solar radiation loading. The probe is designed to be buried or submerged
in water to 50’ (21 psi).
For the –L option, the probe’s cable terminates in pigtails that connect to a
Campbell Scientific datalogger. For the –LC option, the probe’s cable is fitted
with a connector that attaches to an ET107, ET106, or MetData1 Weather
Station. Throughout this manual, 107 will refer to both the 107-L and 107-LC
unless specified otherwise.
Lead length for the 107-L and 107-LC is specified when the sensor is ordered.
Table 1-1 gives the recommended lead length for mounting the sensor on a
tripod or tower.
TABLE 1-1. Recommended Lead 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' 11' 11' 14' 14' 19' 24' 14' 24' 37'
Note: Add two feet to the cable length if you are mounting the enclosure on the leg base of a light-weight tripod.
The 107 ships with:
(1) Resource CD
1.1 Specifications
Sensor: BetaTherm 100K6A Thermistor
Temperature
Measurement Range: -35°to +50°C
Thermistor Inter-
changeability Error: Typically <±0.2°C over 0°C to 60°C; ±0.4 @ -35°C
Temperature
Survival Range: -50°C to +100°C
Steinhart-Hart
Equation Error: ≤±0.01°C over -35° to +50°C (CRBasic dataloggers
only)
1

Model 107 Temperature Probe
Polynomial
Linearization Error: <±0.5°C over -35°C to +50°C (Edlog dataloggers only)
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.
NOTE
2. Accuracy
The overall probe accuracy is a combination of the thermistor's interchangeability
specification, the precision of the bridge resistors, and the Steinhart-Hart equation
error (CRBasic dataloggers) or polynomial error (Edlog dataloggers). In a "worst
case" all errors add to an accuracy of ±0.4°C over the range of -24°to 48°C and
±0.9°C over the range of -38°C to 53°C. The major error component is the
interchangeability specification of the thermistor, tabulated in Table 2-1. For the
range of 0°to 50°C the interchangeability error is predominantly offset and can be
determined with a single point calibration. Compensation can then be done with an
offset entered in the measurement instruction. The bridge resistors are 0.1%
tolerance with a 10 ppm temperature coefficient. Polynomial errors are tabulated
in Table 2-2 and plotted in Figure 2-1.
TABLE 2-1. Thermistor
Interchangeability Specification
Temperature (°C) Temperature Tolerance (±°C)
−40 0.40
−30 0.40
−20 0.32
−10 0.25
0 to +50 0.20
TABLE 2-2. Polynomial Error
for Edlog Dataloggers
-40 to +56 <±1.0°C
-38 to +53 <±0.5°C
-24 to +48 <±0.1°C
2

Model 107 Temperature Probe
FIGURE 2-1. Error Produced by Polynomial Fit to Published Values
(Edlog dataloggers only)
3. Installation
3.1 Air Temperature
3.1.1 Siting
For air temperature measurements, sensors should be located over an open
level area at least 9 m (EPA) in diameter. The surface should be covered by
short grass, or where grass does not grow, the natural earth surface. Sensors
should be located at a distance of at least four times the height of any nearby
obstruction, and at least 30 m (EPA) from large paved areas. Sensors should
be protected from thermal radiation, and adequately ventilated.
Standard air temperature measurement heights:
1.5 m +/- 1.0 m (AASC)
1.25 – 2.0 m (WMO)
2.0 m (EPA)
2.0 m and 10.0 m temperature difference (EPA)
The probe is designed to be buried or submerged in water to 50’ (21 psi).
3.1.2 Assembly and Mounting
Tools required for installing on a tripod or tower:
•1/2” open end wrench
•small screw driver provided with datalogger
•small Phillips screw driver
•UV resistant cable ties
•small pair of diagonal-cutting pliers
3

Model 107 Temperature Probe
The 107 must be housed inside a radiation shield when the sensor will be
exposed to solar radiation (i.e., air temperature measurements made in the
field). The 41303-5A Radiation shield has a U-bolt for attaching the shield to
tripod mast / tower leg (Figure 3-1), or CM200 series crossarm (Figure 3-2).
The radiation shield ships with the U-bolt configured for attaching the shield to
a vertical pipe. Move the U-bolt to the other set of holes to attach the shield to
a crossarm.
41303-5A
107
Tripod Mast
or Tower Leg
FIGURE 3-1. 107 and 41303-5A Radiation Shield on a Tripod Mast
FIGURE 3-2. 107 and 41303-5A Radiation Shield on a
CM200 Series Crossarm
41303-5A
107
Tripod Mast
or Tower Leg
CM200 Series Crossarm
4

Model 107 Temperature Probe
The 107 is held within the 41303-5A by a mounting clamp on the bottom plate
of the 41303-5A (Figure 3-2). Loosen the two mounting clamp screws, and
insert the sensor 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. Secure the cable to the tripod/tower using cable ties.
3.2 Soil Temperature
The 107 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.
3.3 Water Temperature
The 107 can be submerged to 50 feet. Please note that the 107 is not weighted.
Therefore, the installer should either add a weighting system or secure the
probe to a fixed or submerged object such as piling.
4. Wiring
The connection of a 107-L to a Campbell Scientific datalogger is given in
Table 4-1. Refer to the ET107, ET106, or MetData1 manual for connecting a
107-LC to the weather station. Temperature is measured with one Single-
Ended input channel and a Voltage Excitation channel. Multiple 107-L probes
can be connected to the same excitation channel (the number of probes per
excitation channel is physically limited by the number of lead wires that can be
inserted into a single excitation terminal, approximately six).
TABLE 4-1. Connections to Campbell Scientific Dataloggers
Color
Description
CR800
CR850
CR5000
CR3000
CR1000
CR510
CR500
CR10(X)
21X
CR7
CR23X
Black Voltage
Excitation Switched Voltage
Excitation
Switched
Excitation Switched Excitation
Red Temperature
Signal Single-Ended Input Single-Ended Input Single-Ended Input
Purple Signal Ground
AG
Clear Shield
G
5

Model 107 Temperature Probe
5. Programming
This section is for users who write their own datalogger
programs. A datalogger program to measure this sensor can be
generated using Campbell Scientific’s Short Cut Program
Builder software. You do not need to read this section to use
Short Cut.
NOTE
The datalogger is programmed using either CRBasic or Edlog. Dataloggers
that use CRBasic include our CR800, CR850, CR1000, CR3000, CR5000, and
CR9000(X). Dataloggers that use Edlog include our CR510, CR10(X),
CR23X, and CR7. CRBasic and Edlog are included with LoggerNet, PC400,
and RTDAQ software.
If applicable, please read “Section 5.4—Electrically Noisy Environments” and
“Section 5.5—Long Lead Lengths” prior to programming the datalogger.
Measurement details are provided in Section 6.
5.1 CRBasic
The Therm107 measurement instruction is used with dataloggers that are
programmed with CRBasic to measure the 107 probe. Therm107 makes a half
bridge voltage measurement, and converts the measurement result to
temperature using the Steinhart-Hart equation. With a multiplier of 1 and an
offset of 0, the output is temperature in degrees C. With a multiplier of 1.8 and
an offset of 32, the output is temperature in degrees F.
5.2 Edlog
The Temp(107) measurement instruction (P11) is used with dataloggers that
are programmed with Edlog to measure the 107 probe. P11 makes half bridge
voltage measurement, and converts the measurement result to temperature
using a fifth order polynomial. With a multiplier of 1 and an offset of 0, the
output is temperature in degrees C. With a multiplier of 1.8 and an offset of
32, the output is temperature in degrees F.
5.3 Example Programs
TABLE 5-1. Wiring for Example Programs
Color Description CR1000 CR10X
Black Excitation EX1 or VX1 E1
Red Signal SE1 SE1
Purple Signal Ground
AG
Clear Shield
G
Both example programs measure a 107 temperature probe every second and
store a 60 minute average temperature.
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