TheMODEL 108-LC TEMPERATURE PROBE FOR METDATA1 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 withi n their territories. Please visit www.campbe llsci.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
CAMPBELL SCIENTIFIC, INC. does not accept collect calls.
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108-LC 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.
6. Maintenance and Calibration .....................................5
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Model 108-LC Temperature Probe
for MetData1
1. General
The 108 Air/Soil/Water Temperature Probe uses thermistors to measure
temperature. Custom lead lengths are available up to 1000 ft.
For air temperature measurement, a 41303 radiation shield is needed to mount
the 108 Probe and limit solar radiation loading of the 108. The 108 probe is
designed to be buried or submerged in water up to 100 feet.
1.1 Specifications
Temperature Measurement Range: -5° to +95°C
Thermistor Interchangeability Error: Typically <±0.2°C over 0°C to 7 0°C ±0.3
@ 95°C.
Polynomial Linearization Error: <±0.5°C over -7°C to +90°C.
NOTE
2. Accuracy
®
The black outer jacket of the cable is Santoprene
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, the precision of the bridge resistors, and the
polynomial error. In a "worst case" all errors add to an accuracy of ±0.3°C
over the range of -3° to 90°C and ±0.7°C over the range of -7°C to 95°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.
The 108 must be housed inside a radiation shield when used in the field for air
temperature measurement. The 41303 Radiation Shield (see Figure 3-1)
mounts to a CM6 or CM10 tripod. The UT018 mounting arm and UT6P
Radiation Shield are used to mount the 108 to a UT30 tower.
The standard lead length of 6 feet and 9 feet allow the 108 to be mounted at a 2
meter height on the CM6/CM10 tripod or the UT30 tower respectively.
4. Connection
4
FIGURE 3-1. 108 and 41303 Radiation Shield
on a CM6/CM10 Tripod Mast
The 108 cable is attached to the MetData1 connector #4 or #7. Connector #4
uses single-ended input 4L (channel 8) and connector #7 uses single-ended
input 5H (channel 9). The probe is measured by a single-ended analog input
channel.
1:1Reps
2:11*X Loc [ Tmp108C ]
3:11*F(X) Loc [ Tmp108C ]
4:-26.97C0
5:69.635C1
6:-40.66C2
7:16.573C3
8:-3.455C4
9:.301C5
Information in this section is not necessary when programming
the MetData1 with the Short Cut Program Builder software.
Instruction 5 (AC Half Bridge) is used to measure the 108 temperature probe.
Instruction 55 (polynomial) is used to find the temperature in degrees Celsius.
MetData1 Datalogger Program Example
* Proper entries will vary with input location assignments.
** Specify input channel #8 for connector #4. Specify input channel #9 for connector #7.
The 108 Probe requires minimal maintenance. Check monthly to make sure the
radiation shield is free from debris.
5
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Model 108-LC Temperature Probe for MetData1
For most applications it is unnecessary to calibrate the 108 to eliminate the
thermistor offset. However, for those users that are interested, the following
briefly describes calibrating the 108 probes.
A single point calibration can be performed to determine the 108 temperature
offset (thermistor interchangeability). This calibration will not remove the
polynomial error. The value of the offset must be chosen so that the probe
outputs the temperature calculated by the polynomial, not the actual calibration
temperature. For example, a 108 is placed in a calibration chamber that is at
0°C and the probe outputs 0.1°C. The offset is -0.15, because at 0°C the
polynomial calculates a temperature of -0.05°C (Table 5-2).
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Campbell Scientific Companies
Campbell Scientific, Inc. (CSI)
815 West 1800 North
Logan, Utah 84321
UNITED STATES
www.campbellsci.com
info@campbellsci.com
Campbell Scientific Africa Pty. Ltd. (CSAf)
PO Box 2450
Somerset West 7129
SOUTH AFRICA
www.csafrica.co.za
sales@csafrica.co.za
Campbell Scientific Australia Pty. Ltd. (CSA)
PO Box 444
Thuringo wa Cent ra l
QLD 4812 AUSTRALIA
www.campbellsci.com.au
info@campbellsci.com.au
Campbell Scientific do Brazil Ltda . (CSB)
Rua Luisa Crapsi Orsi, 15 Butantã
CEP: 005543-000 São Paulo SP BRAZIL
www.campbellsci.com.br
suporte@campbellsci.com.br
Campbell Scientific Canada Corp. (CSC)
11564 - 149th Street NW
Edmonton, Alberta T5M 1W7
CANADA
www.campbellsci.ca
dataloggers@campbellsci.ca
Campbell Scientific Ltd. (CSL)
Campbell Park
80 Hathern Road
Shepshed, Loughborough LE12 9GX
UNITED KINGDOM
www.campbellsci.co.uk
sales@campbellsci.co.uk
Campbell Scientific Ltd. (France)
Miniparc du Verger - Bat. H
1, rue de Terre Neuve - Les Ulis
91967 COURTABOEUF CEDEX
FRANCE
www.campbellsci.fr
campbell.scientific@wanadoo.fr
Campbell Scientific Spain, S. L.
Psg. Font 14, local 8
08013 Barcelona
SPAIN
www.campbellsci.es
info@campbellsci.es
Please visit www.campbellsci.com to obtain contact information for your local US or International representative.
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