Campbell Scientific 110PV User Manual
110PV Surface
Temperature Probe
Revision: 10/11
Copyright © 2010-2011
Campbell Scientific, Inc.
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110PV Table of Contents
PDF viewers: These page numbers refer to the printed version of this document. Use the
PDF reader bookmarks tab for links to specific sections.
1. General .........................................................................1
1.1 Specifications............................................................................................2
2. Accuracy.......................................................................3
3. Installation and Wiring ................................................7
3.1 Placement on a Photovoltaic (PV) Module...............................................7
3.2 Mounting to a PV Module or Other Device .............................................8
3.3 Cable Strain Relief....................................................................................8
3.4 Submersion ...............................................................................................9
4. Wiring............................................................................9
5. Programming .............................................................10
5.1 CRBasic ..................................................................................................11
5.1.1 CRBasic Examples........................................................................11
5.1.1.1 Sample Program for CR200(X) Series Datalogger .............12
5.1.1.2 Sample Half Bridge Program for CR1000 Datalogger........13
5.1.1.3 Sample 4-Wire Half BridgeProgram for CR1000...............14
5.2 Edlog.......................................................................................................15
5.2.1 Example Edlog Program...............................................................15
5.3 Electrical Noisy Environments ...............................................................17
5.4 Long Lead Lengths.................................................................................17
6. Measurement..............................................................18
7. Maintenance, Removal, and Calibration..................19
7.1 Maintenance............................................................................................19
7.2 Removal from Measurement Surface .....................................................19
7.3 Recalibrations/Repairs............................................................................19
8. Troubleshooting ........................................................19
Appendices
A. Probe Material Properties
A.1 3M 9485PC Adhesive......................................................................... A-1
A.2 Santoprene .......................................................................................... A-1
i
110PV Table of Contents
Figures
Tables
1-1. 110PV Temperature Probe ..................................................................... 1
2-1. Steinhart-Hart Error................................................................................ 3
2-2. 110PV measured with a 3-wire half bridge ............................................ 4
2-3. 110PV measured with a CR1000 using a 4-wire half bridge ................. 4
2-4. 110PV measured with a CR1000 showing effects of cable length
when using a cable offset .................................................................... 5
2-5. 110PV measured with a CR1000 showing effects of cable length......... 5
2-6. 110PV measured with a CR200(X) showing effects of cable length
when a cable offset is used .................................................................. 6
2-7. 110PV measured with a CR200(X) showing effects of cable length ..... 6
3-1. 110PV mounted to a PV module ............................................................ 7
3-2. At left is a PV module with distinctive solar cells. At right is a PV
module that does not have distinctive solar cells. ............................... 7
3-3. 110PV mounted to a PV module using Kapton tape .............................. 8
3-4. 110PV’s strain relief label ...................................................................... 9
6-1. 110PV Thermistor Probe schematic ..................................................... 18
4-1. Connections to Campbell Scientific Dataloggers ................................. 10
5-1. Wiring for Example Programs.............................................................. 11
5-2. Wiring for Example Program ............................................................... 15
ii
110PV Surface Temperature Probe
1. General
The 110PV-L temperature probe uses a thermistor to measure temperature.
The probe is designed for measuring the back of photovoltaic (PV) module
temperature but also can be used to measure other surface temperatures. The
110PV-L is compatible with all Campbell Scientific dataloggers.
The 110PV-L consists of a thermistor encased in an aluminum disk (see Figure
1-1). The aluminum disk protects the thermistor and promotes heat transfer
from surfaces.
The probe measures temperature from –40° to +135°C. For temperatures up to
70°C, an adhesive tab on the probe’s aluminum disk fastens the 110PV to the
measurement surface. If the temperature may exceed 70°C, Kapton tape or
high temperature epoxy is recommend to secure the probe to the measurement
surface. Kapton tape (P/N 27015) is available from Campbell Scientific.
Overmolded joint
Santoprene-jacketed cable
Thermistor encased in an aluminum disk
FIGURE 1-1. 110PV Temperature Probe
The –L portion of the probes model number indicates the probe has a user
defined cable length which will be specified when the probe is ordered.
The probe’s cable can terminate in:
• Pigtails that connect directly to a Campbell Scientific datalogger (option
–PT).
• Connector that attaches to a prewired enclosure (option –PW). Refer to
www.campbellsci.com/prewired-enclosures
• Connector that attaches to a CWS900 Wireless Sensor Interface (option
–CWS). The CWS900 allows the 110PV to be used in a wireless sensor
network. Refer to www.campbellsci.com/cws900
For readability purposes, the probe will be referred to as the 110PV throughout
this document.
for more information.
for more information.
1
110PV Surface Temperature Probe
The 110PV ships with:
1.1 Specifications
Temperature Range: -40° to +135°C
Survival Range: -50° to +140°C
110PV Temperature Uncertainty
-40° to 70°C: ±0.2°C
71° to 105°C: ±0.5°C
106° to 135°C: ±1°C
Time Constant (average):
Test
Still Air 252 seconds
Surface 25 seconds
1) Adhesive Backed 3 cm Cable Tie Mount
2) Cable Ties 8” UV Stabilized
3) Resource CD
τ
Water Submersion Depth: 50 ft (21 psi)
Linearization Error: Steinhart & Hart equation; maximum error is 0.0024°C at
-40°C.
Maximum Cable Length: 1000 ft
Disk Diameter: 1.0 in. (2.54 cm)
Overall Probe Length: 2.5 in. (6.35 cm)
Overmolded Joint Dimensions:
Width: 0.44 in. (1.12 cm)
Height: 0.58 in. (1.47 cm)
Length: 2.25 in. (5.72 cm
Cable Diameter: 0.245 in. (0.622 cm)
Material
Disk: Anodized Aluminum
Cable Jacket: Santoprene
Cable/Probe Connection: Santoprene
Weight: 0.2 lbs (90.7 g) with 10.5 ft (3.2 m) cable
2
NOTE
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.
®
rubber. This
2. Accuracy
110PV Surface Temperature Probe
The overall probe accuracy is a combination of the thermistor's
interchangeability specification and the accuracy of the bridge resistor. The
Steinhart-Hart equation used to calculate temperature has a negligible error
(Figure 2-1). In a "worst case" the errors add to an accuracy of ±0.2°C over
the range of -40° to 70°C; ±0.5°C over the range of 71°C to 105°C; and ±1°C
from 106°C to 135°C. The major error component is the interchangeability
specification (tolerance) of the thermistor. The bridge resistor has a 0.1%
tolerance with a 10 ppm temperature coefficient. Figures 2-2 to 2-7 show the
possible worst case probe and measurement errors.
FIGURE 2-1. Steinhart-Hart Error
3
110PV Surface Temperature Probe
Uncertainty on the graphs below is symmetric about 0.
FIGURE 2-2. 110PV measured with a 3-wire half bridge
4
FIGURE 2-3. 110PV measured with a CR1000 using a 4-wire half bridge
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