Campbell Scientific 110PV User Manual

110PV Surface

Temperature Probe

Revision: 10/11

Copyright © 2010-2011

Campbell Scientific, Inc.

Warranty

“PRODUCTS MANUFACTURED BY CAMPBELL SCIENTIFIC, INC. are
warranted by Campbell Scientific, Inc. (“Campbell”) to be free from defects in
materials and workmanship under normal use and service for twelve (12)
months from date of shipment unless otherwise specified on the corresponding
Campbell invoice. Batteries, fine-wire thermocouples, desiccant, and other
consumables have no warranty. Campbell's obligation under this warranty is
limited to repairing or replacing (at Campbell's option) defective products,
which shall be the sole and exclusive remedy under this warranty. The
customer shall assume all costs of removing, reinstalling, and shipping
defective products to Campbell. Campbell will return such products by surface
carrier prepaid within the continental United States of America. To all other
locations, Campbell will return such products best way CIP (Port of Entry)
INCOTERM® 2010, prepaid. This warranty shall not apply to any Campbell
products which have been subjected to modification, misuse, neglect, improper
service, accidents of nature, or shipping damage. This warranty is in lieu of all
other warranties, expressed or implied. The warranty for installation services
performed by Campbell such as programming to customer specifications,
electrical connections to products manufactured by Campbell, and product
specific training, is part of Campbell’s product warranty. CAMPBELL
EXPRESSLY DISCLAIMS AND EXCLUDES ANY IMPLIED
WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A
PARTICULAR PURPOSE. Campbell is not liable for any special, indirect,
incidental, and/or consequential damages.”

Assistance

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 "Statement of Product Cleanliness
and Decontamination" form and comply with the requirements specified in it.
The form is available from our web site at www.campbellsci.com/repair. A
completed form must be either emailed to [e-mail] or faxed to
[phone]. Campbell Scientific is unable to 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.

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

110PV Surface Temperature Probe

FIGURE 2-4. 110PV measured with a CR1000 showing effects of cable length

when using a cable offset

FIGURE 2-5. 110PV measured with a CR1000 showing effects of cable length

5

110PV Surface Temperature Probe

FIGURE 2-6. 110PV measured with a CR200(X) showing effects of cable length

when a cable offset is used

6

FIGURE 2-7. 110PV measured with a CR200(X) showing effects of cable length

3. Installation and Wiring

3.1 Placement on a Photovoltaic (PV) Module

The 110PV should be centered on the back of the PV module (see Figure 3-1).
If the module has several distinctive photocells (see Figure 3-2), the 110PV
should also be centered on the back of a photocell.

110PV Surface Temperature Probe

FIGURE 3-1. 110PV mounted to a PV module

FIGURE 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

110PV Surface Temperature Probe

3.2 Mounting to a PV Module or Other Device

For mounting the probe to the back of a PV module or another device, the
110PV comes with an adhesive mounting disc adhered to its flat surface. To
mount the 110PV, remove the paper from the mounting disc and adhere it to
the back of the PV module or other device; refer to Section 3.1 for proper
placement on a PV module. The mounting disc must be adhered to a clean
surface for its adhesive to function properly.

If the temperature is expected to exceed 70°C, use Kapton tape, epoxy, or other
means to secure the probe to the measurement surface (see Figure 3-3); a roll
of Kapton tape (P/N 27015) is offered by Campbell Scientific as a Common
Accessory.

8

FIGURE 3-3. 110PV mounted to a PV module using Kapton tape

3.3 Cable Strain Relief

The 110PV’s cable must be properly strain relieved after mounting the probe to
the measurement surface. To accomplish this, the probe comes with cable ties
and a cable tie mount. A yellow label on the 110PV’s cable indicates where
you should tie down the cable (see Figures 3-3 and 3-4).

NOTE

Placement of the cable inside a rugged conduit is advisable for
long cable runs, especially in locations subject to digging,
mowing, traffic, use of power tools, animals, or lightning strikes.

3.4 Submersion

110PV Surface Temperature Probe

FIGURE 3-4. 110PV’s strain relief label

The 110PV can be submerged to 50 ft. It must be adhered to a dry clean
surface before submerging. The probe’s adhesive mounting disc is not
intended for submersion. Therefore the 110PV must be mounted to the
measurement surface via a user-supplied method that is compatible with
submersion.

4. Wiring

Connections to Campbell Scientific dataloggers are given in Table 4-1. Most
CRBasic dataloggers can measure the 110PV using either a 4-wire half bridge
or 3-wire half bridge. The CR200(X) and Edlog dataloggers can only use a
3-wire half bridge. The 4-wire half bridge method is preferred because it
reduces cable errors (see Figures 2-2 and 2-3). The 4-wire half bridge method
requires two differential input channels and one voltage excitation channel.
The 3-wire half bridge method uses one single-ended input channel and one
voltage excitation channel.

Multiple 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 voltage excitation terminal,
approximately six.

9

110PV Surface Temperature Probe

TABLE 4-1. Connections to Campbell Scientific Dataloggers

Color

Black

Description

Voltage
Excitation

Red Signal

Purple

Signal
Reference

Blue

Signal
Reference

Clear Shield

Green Sense +

White Sense -

4-Wire
Half Bridge
CR800
CR850
CR3000
CR1000
CR5000

Switched
Voltage
Excitation

Differential
Input (H)

Differential
Input (L)

Differential
Input (H)

Differential
Input (L)

3-Wire
Half Bridge
CR200(X)
CR800
CR850
CR3000
CR1000
CR5000

Switched
Voltage
Excitation

Single­Ended Input

3-Wire
Half Bridge
CR510
CR500
CR10(X)

Switched
Voltage
Excitation

Single-Ended
Input

AG

3-Wire
Half Bridge
21X
CR7
CR23X

Switched
Voltage
Excitation

Single-Ended
Input

Not Used Not Used Not Used

G

Not Used Not Used Not Used

Not Used Not Used Not Used

5. Programming

NOTE

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.

The datalogger is programmed using either CRBasic or Edlog. Dataloggers
that use CRBasic include our CR200(X) series, CR800, CR850, CR1000,
CR3000, CR5000, and CR9000(X); see Section 5.1. Dataloggers that use
Edlog include our CR10, CR10X, CR23X, and CR7; refer to Section 5.2.
CRBasic and Edlog are included in our LoggerNet, PC400, and RTDAQ
software.

The Steinhart-Hart equation is used to calculate the temperature. The
coefficients used for the Steinhart-Hart equation are as follows:

A=1.129241*10^-3
B=2.341077*10^-4
C=8.775468*10^-8

If applicable, please read “Section 5.3—Electrical Noisy Environments” and
“Section 5.4—Long Lead Lengths” prior to programming your datalogger.
Measurement details are provided in Section 6.

10

5.1 CRBasic

110PV Surface Temperature Probe

The CR200(X)-series dataloggers use the ExDelSe instruction to measure the
110PV (see example in Section 5.1.1.1). The ExDelSe instruction has the
following syntax:

ExDelSE( Dest, Reps, SEChan, ExChan, ExmV, Delay, Mult, Offset )

The CR800, CR850, CR1000, CR3000, CR5000, and CR9000(X) can use
either the BrHalf4W instruction or BrHalf instruction to measure the 110PV
(see examples in Sections 5.1.1.2 and 5.1.1.3).

For these dataloggers, the BrHalf4W instruction is typically preferred because
it reduces cable errors (see Figures 2-2 and 2-3). The BrHalf instruction
requires fewer input channels.

A typical BrHalf4W instruction follows:

BrHalf4W (Dest,1,mV2500,mV2500,1,Vx1,1,2500,True ,True ,0,250,1.0,0)

A typical BrHalf instruction follows:

BrHalf (Dest,1,mV2500,1,Vx1,1,2500,True ,0,250,1.0,0)

A multiplier of 1.0 and offset of 0.0 should be used in the ExDelSe, BrHalf4W,
and BrHalf instructions to yield a temperature in degrees Celsius. For
Fahrenheit multiply the calculated Celsius temperature by 1.8 then add 32.

5.1.1 CRBasic Examples

TABLE 5-1. Wiring for Example Programs

Black Voltage Excitation VX1 or EX1 VX1 or EX1

Red Signal SE1 Diff 1H

Purple Signal Reference

Blue Signal Reference Not Used

Clear Shield

Green Sense + Not Used Diff 2H

White Sense - Not Used Diff 2L

Datalogger Connection Color Description

BrHalf BrHalf4W

Diff 1L

11

110PV Surface Temperature Probe

5.1.1.1 Sample Program for CR200(X) Series Datalogger

'CR200 Series Datalogger
'This example program measures a single 110PV-L probe
'once a second using the ExDelSE instruction and stores
'the average temperature in degrees C every 10 minutes.

'110PV-L Wiring configuration for program example
'Lead Color CR200(X) Channel Description
'Black ------ VX1 ------------ Voltage Excitation
'Red -------- SE1------------- Signal
'Purple----- AG-------------- Signal Reference
'Blue ------- Not Used ------ N/A
'Green ----- Not Used ------ N/A
'White------ Not Used ------ N/A
'Clear------ AG-------------- Shield

'Declare variables for temperature measurement

Public T110PV_mV
Public T110PV_Res
Public T110PV_Temp_C
Public T110PV_Temp_F

'Declare constants to be used in Steinhart-Hart equation

Const A=1.129241*10^-3
Const B=2.341077*10^-4
Const C=8.775468*10^-8
Const R_cable=0 'see sensor cable for cable resistance

'Declare variable units

Units T110PV_mV= millivolts
Units T110PV_Res=Ohms
Units T110PV_Temp_C=Deg C

'Define a data table for 10 minute averages

DataTable (AvgTemp,1,1000)
DataInterval (0,10,min)
Average (1,T110PV_Temp_C,False)
EndTable

'Main Program

BeginProg
Scan (1,Sec)

' Measure 110PV-L probe with SE1

ExDelSE (T110PV_mV,1,1,Ex1,mV2500,500,1.0,0)

' Convert mV to ohms

T110PV_Res = 4990*(2500/T110PV_mV)-4990

' Subtract off cable resistance (see 110PV-L cable for R_cable)

T110PV_Res = T110PV_Res-R_cable

' Using the Steinhart-Hart equation to convert resistance to temperature

T110PV_Temp_C = (1/(A+B*LOG(T110PV_Res)+C*(LOG(T110PV_Res))^3))-273.15

12

110PV Surface Temperature Probe

'Convert Celsius to Fahrenheit

T110PV_Temp_F = T110PV_Temp_C * 1.8 + 32

'Call AvgTemp data table

CallTable AvgTemp
NextScan
EndProg

5.1.1.2 Sample Half Bridge Program for CR1000 Datalogger

'CR1000 Series Datalogger
'This example program measures a single 110PV-L probe utilizing
'the BrHalf instruction once a second and stores the average
'temperature in degrees C every 10 minutes.

'110PV-L Wiring Configuration
'Lead Color CR1000 Channel Description
'Black ------ VX1------------- Voltage Excitation
'Red -------- SE1 ------------- Signal
'Purple----- AG -------------- Signal Reference
'Blue ------- Not Used------- N/A
'Green------ Not Used------- N/A
'White ------ Not Used------- N/A
'Clear ------ AG -------------- Shield

'Declare variables for temperature measurement using Half Bridge configuration

Public T110PV_mV
Public T110PV_Res
Public T110PV_Temp_C
Public T110PV_Temp_F

'Declare Constants to be used in Steinhart-Hart equation

Const A=1.129241*10^-3
Const B=2.341077*10^-4
Const C=8.775468*10^-8
Const R_cable=0 'see sensor cable for cable resistance

'Declare variable units

Units T110PV_mV= millivolts
Units T110PV_Res=Ohms
Units T110PV_Temp_C=Deg C
Units T110PV_Temp_F=Deg F

'Define a data table for 10 minute averages

DataTable (AvgTemp,1,1000)
DataInterval (0,10,Min,10)
Average (1,T110PV_Temp_C,FP2,False)
EndTable

13

110PV Surface Temperature Probe

BeginProg
Scan (1,Sec,3,0)

' Measure 110PV-L probe

BrHalf (T110PV_mV,1,mV2500,1,Vx1,1,2500,True ,0,_60Hz,1.0,0)

' Convert mV to ohms

T110PV_Res=4990*(1-T110PV_mV)/T110PV_mV

' Subtract off cable resistance (see 110PV-L cable for R_cable)

T110PV_Res= T110PV_Res-R_cable

' Using the Steinhart-Hart equation to convert resistance to temperature

T110PV_Temp_C = (1/(A+B*LOG(T110PV_Res)+C*(LOG(T110PV_Res))^3))-273.15

'Convert Celsius to Fahrenheit

T110PV_Temp_F = T110PV_Temp_C * 1.8 + 32

'Call AvgTemp data table

CallTable AvgTemp
NextScan
EndProg

5.1.1.3 Sample 4-Wire Half BridgeProgram for CR1000

'CR1000 Series Datalogger
'This example program measures a single 110PV-L probe utilizing the
'BRHalf4Winstruction once a second and stores the
'average temperature in degrees C every 10 minutes.

'110PV-L Wiring Configuration
'Lead Color CR1000 Channel Description
'Black ------ VX1/EX1 ------ Voltage Excitation
'Red -------- DIFF1H ------- Signal
'Purple----- DIFF1L-------- Signal Reference
'Blue ------- AG-------------- Signal Reference
'Green ----- DIFF2H ------- Sense +
'White------ DIFF2L-------- Sense ­'Clear------ AG-------------- Shield

'Declare variables for temperature measurement using Half Bridge configuration

Public T110PV_mV
Public T110PV_Res
Public T110PV_Temp_C
Public T110PV_Temp_F

'Declare constants to be used in Steinhart-Hart equation

Const A=1.129241*10^-3
Const B=2.341077*10^-4
Const C=8.775468*10^-8

'Declare variable units

Units T110PV_mV= millivolts
Units T110PV_Res=Ohms
Units T110PV_Temp_C=Deg C
Units T110PV_Temp_F=Deg F

14

110PV Surface Temperature Probe

'Define a data table for 10 minute averages

DataTable (AvgTemp,1,1000)
DataInterval (0,10,Min,10)
Average (1,T110PV_Temp_C,FP2,False)
EndTable

BeginProg
Scan (1,Sec,3,0)

' Measure 110PV-L probe

BrHalf4W (T110PV_mV,1,mV2500,mV2500,1,Vx1,1,2500,True,True,0,_60Hz,1.0,0)

' Convert mV to ohms

T110PV_Res=4990 *T110PV_mV

' Use the Steinhart-Hart equation to convert resistance to temperature

T110PV_Temp_C = (1/(A+B*LOG(T110PV_Res)+C*(LOG(T110PV_Res))^3))-273.15

'Convert Celsius to Fahrenheit

T110PV_Temp_F = T110PV_Temp_C * 1.8 + 32
CallTable AvgTemp
NextScan
EndProg

5.2 Edlog

In Edlog, Instruction 5 is typically used to measure the 110PV-L. The ratio
metric output is then converted to resistance and finally to temperature (see
Section 5.2.1).

5.2.1 Example Edlog Program

TABLE 5-2. Wiring for Example Program

Color Description CR10X

Black Voltage Excitation E1

Red Signal SE1

Purple Signal Reference AG

Clear Shield G

Blue Not Used Not Used

Green Not Used Not Used

White Not Used Not Used

15

110PV Surface Temperature Probe

Example Program for CR10X

;{CR10X}
;This program measures a single 110PV-L probe utilizing the
;P5 instruction once a second and stores the average
;temperature in degrees C every ten minutes.

*Table 1 Program
01: 1 Execution Interval (seconds)

;Measure 110PV-L Probe

1: AC Half Bridge (P5)
1: 1 Reps
2: 25 2500 mV 60 Hz Rejection Range
3: 1 SE Channel
4: 1 Excite all reps w/Exchan 1
5: 2500 mV Excitation
6: 1 Loc [ V_Vx ]
7: 1.0 Multiplier
8: 0.0 Offset

;Convert ratio-metric output to resistance (next three instructions)

2: Z=1/X (P42)
1: 1 X Loc [ V_Vx ]
2: 2 Z Loc [ Vx_V ]

3: Z=X+F (P34)
1: 2 X Loc [ Vx_V ]
2: -1.0 F
3: 3 Z Loc [ Vx_V1 ]

4: Z=X*F (P37)
1: 3 X Loc [ Vx_V1 ]
2: 4990 F
3: 4 Z Loc [ Rx ]

;Correct for cable resistance (see 110PV-L cable label for resistance value F in Ohms)

5: Z=X+F (P34)
1: 4 X Loc [ Rx ]
2: 0.0 F
3: 5 Z Loc [ Rtherm ]

;Convert resistance to Temperature

6: Steinhart-Hart Equation (P200)
1: 1 Reps
2: 5 Source Loc (R)(Ohms) [ Rtherm ]
3: 6 Destination Loc (Deg C) [ Temp_C ]
4: 1.12924 A
5: -3 x 10^n
6: 2.34108 B
7: -4 x 10^n
8: 8.77547 C
9: -8 x 10^n

16

110PV Surface Temperature Probe

;Every ten minutes set output flag high to write data final storage

7: If time is (P92)
1: 0000 Minutes (Seconds --) into a
2: 10 Interval (same units as above)
3: 10 Set Output Flag High (Flag 0)

;Time stamp data record

8: Real Time (P77)^20972
1: 110 Day,Hour/Minute (midnight = 0000)

;Write 110PV-L 10 minute average to final storage

9: Average (P71)^4293
1: 1 Reps
2: 6 Loc [ Temp_C ]

*Table 2 Program
02: 0.0000 Execution Interval (seconds)

*Table 3 Subroutines

End Program

5.3 Electrical Noisy Environments

AC power lines, pumps, and motors, can be the source of electrical noise. If
the 110PV probe or datalogger is located in an electrically noisy environment,
the 110PV probe should be measured with the 60 or 50 Hz rejection option as
shown in the examples in Section 5.1.1.2 and Section 5.2.1.

5.4 Long Lead Lengths

It is recommended that the cable resistance of the 110PV-L be corrected for
noting it can contribute significant error (see Figure 2-6). The cable resistance
of each 110PV-L probe in ohms is printed on a heat shrink label found on the
sensor cable. When measuring the 110PV-L in three wire configurations the
cable resistance can be subtracted from the measured resistance value as shown
in the CR10X, CR200(X) and CR1000 Half Bridge program examples above.

Alternatively the 110PV-L is equipped with cable sense leads which can be
used to correct for cable resistance as seen in the CR1000 4-Wire Half Bridge
program example.

Additional settling time may be required for lead lengths longer than 300 feet,
where settling time is the delay before the measurement is made.

For the CR200(X)-series, CR800, CR850, CR1000, and CR3000, the 60 and
50 Hz integration options include a 3 ms settling time; longer settling times can
be entered into the Settling Time parameter.

17

110PV Surface Temperature Probe

G

6. Measurement

Understanding the details in this section is not necessary for general operation
of the 110PV Probe with CSI's dataloggers.

Sense +

Volt Excite

BLACK

GREEN

THERMISTOR

Signal

WHITE

RED

PURPLE

BLUE

CLEAR (shield)

4.99 k

Ω

, 0.1%

Sense -

Signal Reference

Signal Reference

FIGURE 6-1. 110PV Thermistor Probe schematic

Simple half bridge measurement, ignoring cable resistance

The measured voltage, V, is:

=

EX

Where V

is the excitation voltage, 4,990 ohms is the resistance of the fixed

EX

resistor and R

990,4

990,4

is the resistance of the thermistor

t

RVV+

t

The resistance of the thermistor is:

V

R

t

⎛
⎜

V

⎝

EX

⎞

−= 1990,4

⎟
⎠

The Steinhart-Hart equation is used to calculate temperature from Resistance:

T++=

K

Where T

is the temperature in Kelvin. The Steinhart- Hart coefficients used

K

1

3

))(ln()ln(

RCRBA

TT

are:

-3

A = 1.129241x10
B = 2.341077x10
C = 8.775468x10

-4

-8

18

110PV Surface Temperature Probe

7. Maintenance, Removal, and Calibration

7.1 Maintenance

The 110PV probe requires minimal maintenance. Periodically check cabling
for proper connections, signs of damage, and possible moisture intrusion.

7.2 Removal from Measurement Surface

Remove the 110PV from the measurement surface by heating the probe to 70°
to 80°C, and then pulling it off.

CAUTION

Prying the 110PV off without heating it will likely damage
both the probe and PV module.

7.3 Recalibrations/Repairs

For all factory repairs and recalibrations, customers must get returned materials
authorization number (RMA). Customers must also properly fill out a
“Declaration of Hazardous Material and Decontamination” form, and comply
with the requirements specified within. Refer to the “Assistance” page at the
front of this manual for more information.

8. Troubleshooting

Symptom: Temperature is NAN, -INF, -9999, -273

Verify the red wire is connected to the correct single-ended analog input
channel as specified by the measurement instruction, the black wire is
connected to the switched excitation channel as specified by the measurement
instruction, and the purple wire is connected to datalogger ground.

Symptom: Incorrect Temperature

Verify the multiplier and offset parameters are correct for the desired units
(Section 5). Check the cable for signs of damage and possible moisture
intrusion.

CAUTION

NOTE

If the 110PV needs to be sent to Campbell Scientific for
repairs, remember that the probe must be heated to 70° to
80°C before removing it from the measurement surface.
Prying the probe off without heating it will likely damage
both the probe and the PV module.

For all factory repairs, customers must get an RMA. Customers
must also properly fill out a “Declaration of Hazardous Material
and Decontamination” form and comply with the requirements
specified in it. Refer to the “Assistance” page at the front of this
manual for more information.

19

110PV Surface Temperature Probe

Symptom: Unstable Temperature

Try using the 60 or 50 Hz integration options, and/or increasing the settling
time as described in Sections 8 and 9. Make sure the clear shield wire is
connected to datalogger ground, and the datalogger is properly grounded.

20

Appendix A. Probe Material Properties

The probe consists of 6061 aluminum (clear anodized), thermistor, 3M9485PC
adhesive, and Santoprene jacketed cable.

A.1 3M 9485PC Adhesive

Humidity Resistance: High humidity has a minimal effect on adhesive
performance. Bond strengths are generally higher after exposure for 7 days at 90°F
(32°C) and 90% relative humidity.

U.V. Resistance: When properly applied, nameplates and decorative trim parts are
not adversely affected by outdoor exposure.

Water Resistance: Immersion in water has no appreciable effect on the bond
strength. After 100 hours in room temperature water the bond actually shows an
increase in strength.

Temperature Cycling Resistance: Bond strength generally increases after cycling
four times through:

• 4 hours at 158°F (70°C)

• 4 hours at -20°F (-29°C)

A.2 Santoprene

• 16 hours at room temperature

Chemical Resistance: When properly applied, adhesive will hold securely after
exposure to numerous chemicals including gasoline, oil, Freon™ TF, sodium
chloride solution, mild acids and alkalis.

Heat Resistance: Adhesive 350 is usable for short periods (minutes, hours) at
temperatures up to 350°F (177°C) and for intermittent longer periods (days, weeks)
up to 250°F (121°C).

Low Temperature Service: -40°F (-40°C). Parts should be tested for low
temperature shock service.

The following information is from Advanced Elastomer Systems; Santoprene
Rubber Fluid Resistance Guide; pp 2, 3, 9; copyright 2000.

A-1

Appendix A. Probe Material Properties

A-2

Appendix A. Probe Material Properties

A-3

Appendix A. Probe Material Properties

A-4

Campbell Scientific Companies

Campbell Scientific, Inc. (CSI)

815 West 1800 North

Logan, Utah 84321

UNITED STATES

www.campbellsci.com • [e-mail]

Campbell Scientific Africa Pty. Ltd. (CSAf)

PO Box 2450

Somerset West 7129

SOUTH AFRICA

www.csafrica.co.za • [e-mail]

Campbell Scientific Australia Pty. Ltd. (CSA)

PO Box 444

Thuringowa Central

QLD 4812 AUSTRALIA

www.campbellsci.com.au • [e-mail]

Campbell Scientific do Brazil Ltda. (CSB)

Rua Luisa Crapsi Orsi, 15 Butantã

CEP: 005543-000 São Paulo SP BRAZIL

www.campbellsci.com.br • [e-mail]

Campbell Scientific Canada Corp. (CSC)

11564 - 149th Street NW

Edmonton, Alberta T5M 1W7

CANADA

www.campbellsci.ca • [e-mail]

Campbell Scientific Centro Caribe S.A. (CSCC)

300 N Cementerio, Edificio Breller

Santo Domingo, Heredia 40305

COSTA RICA

www.campbellsci.cc • [e-mail]

Campbell Scientific Ltd. (CSL)

Campbell Park

80 Hathern Road

Shepshed, Loughborough LE12 9GX

UNITED KINGDOM

www.campbellsci.co.uk • [e-mail]

Campbell Scientific Ltd. (France)

3 Avenue de la Division Leclerc

92160 ANTONY

FRANCE

www.campbellsci.fr • [e-mail]

Campbell Scientific Spain, S. L.

Avda. Pompeu Fabra 7-9, local 1

08024 Barcelona

SPAIN

www.campbellsci.es • [e-mail]

Please visit www.campbellsci.com to obtain contact information for your local US or International representative.