Contents

Campbell Scientific CR10TCR Probe Instruction Manual PDF

1 of 10
1 of 10

Summary of Content for Campbell Scientific CR10TCR Probe Instruction Manual PDF

IN ST

R U

C T

IO N

M A

N U

A L

CR10TCR Thermocouple Reference

Revision: 12/96

C o p y r i g h t ( c ) 1 9 9 5 - 1 9 9 6 C a m p b e l l S c i e n t i f i c , I n c .

Warranty and Assistance The CR10TCR THERMOCOUPLE REFERENCE 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 (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.

i

CR10TCR 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 Temperature Sensor .............................1

3. Installation and Wiring ...............................................2

4. Programming ..............................................................2

5. Instruction 11 Details..................................................2

6. Electrically Noisy Environments ...............................3

This is a blank page.

1

CR10TCR THERMOCOUPLE REFERENCE

1. GENERAL The Model CR10TCR Probe contains a thermistor for measuring temperature and is used as a reference temperature for thermocouples measured with the CR10. It is installed between the two terminal stripes in the wiring panel. After all the thermocouples are wired, the wiring panel cover is installed to minimize temperature gradients on the terminal strip.

1.1 SPECIFICATIONS

Temperature Measurement Range: -35 to +50C

Thermistor Interchangeability Error: Typically <0.2C over 0C to 60C 0.4 @ -35C.

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

2. ACCURACY TEMPERATURE SENSOR 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 0.4C over the range of -24 to 48C and 0.9C over the range of -38C to 53C. The major error component is the interchangeability specification of the thermistor, tabulated in Table 1. For the range of 0 to 50C the interchangeability error is predominantly offset. The bridge resistors are 0.1% tolerance with a 10 ppm temperature coefficient. Polynomial errors are tabulated in Table 2 and plotted in Figure 1.

TABLE 1. Thermistor Interchangeability Specification

Temperature Temperature (C) Tolerance (C)

40 0.40 30 0.40 20 0.32 10 0.25 0 to +50 0.20

TABLE 2. Polynomial Error

-40 to +56 <1.0C -38 to +53 <0.5C -24 to +48 <0.1C

FIGURE 1. Error Produced by Polynomial Fit to Published Values

CR10TCR THERMOCOUPLE REFERENCE

2

3. INSTALLATION AND WIRING The wiring diagram for the CR10TCR is shown in Figure 1. The probe requires a single-ended analog input channel and an excitation channel. After the CR10TCR and thermocouple are connected to the datalogger, install the wiring panel cover (Figure 2 and 3).

FIGURE 2. Wiring Diagram

FIGURE 3. Wiring Panel, CR10TCR, and Wiring Panel Cover

FIGURE 4. CR10TCR Installed on the CR10 Wiring Panel

4. PROGRAMMING Instruction 11 is used to measure the CR10TCR. 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.

CAUTION: The reference temperature for thermocouples must be in degrees Celsius.

EXAMPLE 1. Sample CR10 Instructions

01: P11 Temp 107 Probe 01: 1 Rep 02: 1 IN Chan 03: 3 Excite all reps w/EXchan 3 04: 15* Loc [:Ref_Temp] 05: 1 Mult 06: 0 Offset

* Proper entries will vary with program and input location.

5. INSTRUCTION 11 DETAILS Understanding the details in this section are not necessary for general operation of the CR10TCR with Campbell Scientific's dataloggers.

Instruction 11 outputs a precise 2 VAC excitation and measures the voltage drop due to the sensor resistance (Figure 5). The thermistor resistance changes with temperature. Instruction 11 calculates the ratio of voltage measured to excitation voltage (Vs/Vx) which is related to resistance, as shown below:

Vs/Vx = 1000/(Rs+249000+1000)

where Rs is the resistance of the thermistor.

See the measurement section of the datalogger manual for more information on bridge measurements.

Instruction 11 then calculates temperature using a fifth order polynomial equation correlating Vs/Vx with temperature. The polynomial coefficients are given in Table 3. The polynomial input is (Vs/Vx)*800. Resistance and datalogger output at several temperatures are shown in Table 4.

Black

Red

Clear

FIGURE 5. CR10TCR Reference Temperature Schematics

Analog Ground; Clear

Switched Excitation; Black (E3)

Single-Ended Input; Red (1H)

CR10TCR THERMOCOUPLE REFERENCE

3

TABLE 3. Temperature, Resistance, and Datalogger Output

Temperature Resistance Output C OHMS C

-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 -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

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 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

TABLE 4. Polynomial Coefficients

Coefficient Value C0 -53.4601 C1 90.807 C2 -83.257 C3 52.283 C4 -16.723 C5 2.211

6. ELECTRICALLY NOISY ENVIRONMENTS AC power lines can be the source of electrical noise. If the datalogger is in an electronically noisy environment, the CR10TCR temperature measurement should be measured with the AC half bridge (Instruction 5) with the 60 Hz rejection integration option on the CR10 (see Section 13 of the datalogger manual for more information on noise). Instruction 11's fast integration will not reject 60 Hz noise.

Example 2. Sample CR10 Instructions Using AC Half Bridge

01: P5 AC Half Bridge 01: 1 Rep 02: 22 7.5 mV 60 Hz rejection Range 03: 1 IN Chan 04: 3 Excite all reps w/EXchan 1 05: 2000 mV Excitation 06: 15* Loc [:Ref_Temp] 07: 800 Mult 08: 0 Offset

02: P55 Polynomial 01: 1 Rep 02: 1* X Loc Air Temp 03: 15* F(X) Loc [:Ref_Temp] 04: -53.46 C0 05: 90.807 C1 06: -83.257 C2 07: 52.283 C3 08: -16.723 C4 09: 2.211 C5

* Proper entries will vary with program and input location assignments.

CR10TCR THERMOCOUPLE REFERENCE

4

This is a blank page.

This is a blank page.

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

Thuringowa Central QLD 4812 AUSTRALIA www.campbellsci.com.au info@campbellsci.com.au

Campbell Scientific do Brazil Ltda. (CSB) Rua Luisa Crapsi Orsi, 15 Butant

CEP: 005543-000 So 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

Manualsnet FAQs

If you want to find out how the CR10TCR Campbell Scientific works, you can view and download the Campbell Scientific CR10TCR Probe Instruction Manual on the Manualsnet website.

Yes, we have the Instruction Manual for Campbell Scientific CR10TCR as well as other Campbell Scientific manuals. All you need to do is to use our search bar and find the user manual that you are looking for.

The Instruction Manual should include all the details that are needed to use a Campbell Scientific CR10TCR. Full manuals and user guide PDFs can be downloaded from Manualsnet.com.

The best way to navigate the Campbell Scientific CR10TCR Probe Instruction Manual is by checking the Table of Contents at the top of the page where available. This allows you to navigate a manual by jumping to the section you are looking for.

This Campbell Scientific CR10TCR Probe Instruction Manual consists of sections like Table of Contents, to name a few. For easier navigation, use the Table of Contents in the upper left corner.

You can download Campbell Scientific CR10TCR Probe Instruction Manual free of charge simply by clicking the “download” button in the upper right corner of any manuals page. This feature allows you to download any manual in a couple of seconds and is generally in PDF format. You can also save a manual for later by adding it to your saved documents in the user profile.

To be able to print Campbell Scientific CR10TCR Probe Instruction Manual, simply download the document to your computer. Once downloaded, open the PDF file and print the Campbell Scientific CR10TCR Probe Instruction Manual as you would any other document. This can usually be achieved by clicking on “File” and then “Print” from the menu bar.