Campbell 107-LC Instruction Manual

INSTRUCTION MANUAL

Model 107-LC Temperature

Probe for MetData1

Revision: 4/03

Copyright (c) 1983-2003

Campbell Scientific, Inc.

Warranty and Assistance

The 107-LC TEMPERATURE PROBE FOR METDATA1 is warranted by
CAMPBELL SCIENTIFIC, INC. to be free from defects in materials and
workmanship under nor mal use and service for twelve (12) months from date of
shipment unless specifi ed 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
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served by Campbell Scientific, Inc. directly. Affiliate companies handle repairs
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107-LC Table of Contents

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1. General........................................................................1

1.1 Specifications............................................................................................1

2. Accuracy .....................................................................1

3. Installation...................................................................3

4. Connection..................................................................4

5. Programming ..............................................................4

6. Maintenance and Calibration .....................................5

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Model 107-LC Temperature Probe for MetData1

1. General

The 107 Air/Soil/Water Temperature Probe uses a thermistor to measure
temperature. Custom lead lengths are available up to 1000 ft.

For air temperature measurement, a 41303 radiation shield is used to mount
and limit solar radiation loading of the 107. The 107 probe is designed to be
buried or submerged in water up to 100 feet.

1.1 Specifications

Temperature
Measurement Range: -35° to +50°C

Thermistor Inter­Changeability Error: Typically <±0.2°C over 0°C to 60°C; ±0.4 @ -35°C.

Polynomial
Linearization Error: <±0.5°C over -35°C to +50°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 ±0.4°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.

®

rubber. This

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Model 107-LC Temperature Probe for MetData1

TABLE 2-1. Thermistor Interchangeability Specification

TABLE 2-3. Temperature, Re sistance, and Datalogger Output

Temperature Resistance Output

-40.00 4067212 -39.18

-38.00 3543286 -37.55

-36.00 3092416 -35.83

-34.00 2703671 -34.02

-32.00 2367900 -32.13

-30.00 2077394 -30.18

-28.00 1825568 -28.19

-26.00 1606911 -26.15

-24.00 1416745 -24.11

-22.00 1251079 -22.05

-20.00 1106485 -20.00

-18.00 980100 -17.97

-16.00 869458 -15.95

-14.00 772463 -13.96

-12.00 687276 -11.97

-10.00 612366 -10.00

10.00 207807 10.06

12.00 187803 12.07

14.00 169924 14.06

16.00 153923 16.05

18.00 139588 18.02

20.00 126729 19.99

22.00 115179 21.97

24.00 104796 23.95

Temperature

Temperature (°C) Tolerance (

−40 0.40

−30 0.40

−20 0.32

−10 0.25

0 to +50 0.20

TABLE 2-2. Polynomial Error

-40 to +56 <±1.0°C

-38 to +53 <±0.5°C

-24 to +48 <±0.1°C

°C OHMS °C

-8.00 546376 -8.02

-6.00 488178 -6.05

-4.00 436773 -4.06

-2.00 391294 -2.07

0.00 351017 -0.06

2.00 315288 1.96

4.00 283558 3.99

6.00 255337 6.02

8.00 230210 8.04

±°C)

2

Model 107-LC Temperature Probe for MetData1

26.00 95449 25.94

28.00 87026 27.93

30.00 79428 29.95

32.00 72567 31.97

34.00 66365 33.99

36.00 60752 36.02

38.00 55668 38.05

40.00 51058 40.07

42.00 46873 42.07

44.00 43071 44.05

46.00 39613 46.00

48.00 36465 47.91

50.00 33598 49.77

52.00 30983 51.59

54.00 28595 53.35

56.00 26413 55.05

58.00 24419 56.70

60.00 22593 58.28

3. Installation

FIGURE 2-1. Error Produced by Polynomial Fit to Published Values

The 107 must be housed inside a radiation shield when used in the field. The
41303 Radiation Shield (see Figure 3-1) mounts to a CM6 or CM10 tripod. The
UT018 mounting arm and UT6P Radiation Shield mount to a UT30 tower.

The standard lead length of 6 feet and 9 feet allow the 107 to be mounted at a 2
meter height on the CM6/CM10 tripod or the UT30 tower respectively.

3

Model 107-LC Temperature Probe for MetData1

4. Connection

5. Programming

NOTE

FIGURE 3-1. 107 and 41303 Radiation Shield

on a CM6/CM10 Tripod Mast

The 107 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).

Information in this section is not necessary when programming
the MetData1 with the Short Cut Program Builder software.

Instruction 11 is used to measure temperature. Instruction 11 provides AC
excitation, makes a single-ended voltage measurement, and calculates
temperature with a fifth order polynomial. A multiplier of 1.0 and an offset of

0.0 yields temperature in Celsius. For Fahrenheit, use a multiplier of 1.8 and an
offset of 32.

4

Model 107-LC Temperature Probe for MetData1

MetData1 Datalogger Program Example

01: Temp 107 Probe (P11)

1: 1 Rep
2: 8 or 9** IN Chan
3: 3 Excite all reps w/EXchan 3
4: 11* Loc [:Air_Temp]
5: 1 Mult

6: 0 Offset
* Proper entries will vary with input location assignments.
** Specify input channel #8 for connector #4. Specify input channel #9 for connector #7.

6. Maintenance and Calibration

The 107 Probe requires minimal maintenance. Check monthly to make sure the
radiation shield is free from debris.

For most applications it is unnecessary to calibrate the 107 to eliminate the
thermistor offset. However, for those users that are interested, the following
briefly describes calibrating the 107 probes.

A single point calibration can be performed to determine the 107 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 107 is placed in a calibration chamber that is at
0°C and the probe outputs 0.1°C. The offset is -0.16, because at 0°C the
polynomial calculates a temperature of -0.06°C (Table 7-1).

5

Model 107-LC Temperature Probe for MetData1

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