Campbell CR10XTCR Manual de usuario

INSTRUCTION MANUAL

CR10XTCR

Thermocouple Reference

Revision: 1/03

Campbell Scientific, Inc.

Warranty and Assistance

The CR10XTCR 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.

CR10XTCR Table of Contents

PDF viewers note: These page numbers refer to the printed version of this document. Use

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

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

2. Accuracy — Temperature Sensor .............................1

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

4. Programming ..............................................................3

5. Instruction 11 Details..................................................4

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

This is a blank page.

CR10XTCR Thermocouple Reference

1. General

The Model CR10XTCR Probe contains a thermistor for measuring temperature

and is used as a reference temperature for thermocouples measured with the

CR10X. 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 +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.

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 ±0.4°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 1. For the range of 0°to 50°C 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 (°C) Temperature

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 <±1.0°C

-38 to +53 <±0.5°C

-24 to +48 <±0.1°C

CR10XTCR Thermocouple Reference

FIGURE 1. Error Produced by Polynomial Fit to Published Values

3. Installation and Wiring

The wiring diagram for the CR10XTCR is shown in Figure 1. The probe

requires a single-ended analog input channel and an excitation channel. After

the CR10XTCR and thermocouple are connected to the datalogger, install the

wiring panel cover (Figure 2 and 3).

CR10XTCR

LT#343403

FIGURE 2. Wiring Diagram

Analog Ground;

Clear (AG)

Switched

Excitation;

Black (E3)

Single-Ended Input; Red (1H)

CR10XTCR Thermocouple Reference

CS I/0

CR10X WIRING PANEL

MADE IN USA

WIRING

PANEL NO.

G 12V

POWER

DEF

EARTH

CROUND

GGHLAG HLAG E3 AG GG

LAG H

785

910 6

11 12

AG GGG

SW 12V CTRL

SW 12V

GGHLAG HLAG E3 AG G

LAG H

122

343

GGHLAG HLAG E3 12V12V

LAG HSDM

LOGAN, UTAH

FIGURE 3. Wiring Panel, CR10XTCR, and Wiring Panel Cover

DIFF GGH L

1AG H L AG H L AG E1 AGE2 G

256

DIFF GGH L

4AG H L AG H L AG E3 AGG G

910

511 12

P1 G P2 G C8 C7

5V 5V G G

SW 12

Logan, Utah

EARTH

GROUND

CR10XTCR

LT#343403

TYPETTHERMOCOUPLE

Clear

Red

Black

FIGURE 4. CR10XTCR Installed on the CR10X Wiring Panel

4. Programming

Instruction 11 is used to measure the CR10XTCR. 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.

The reference temperature for thermocouples must be in

degrees Celsius.

CAUTION

Clear

Black

TYPE T THERMOCOUPLE

Red

CR10XTCR Thermocouple Reference

EXAMPLE 1. Sample CR10X Instructions

01: Temp 107 Probe (P11)

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 CR10XTCR 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. CR10XTCR Reference Temperature Schematics

CR10XTCR Thermocouple Reference

TABLE 3. Temperature, Resistance, and

Datalogger Output

Temperature °C Resistance OHMS Output °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

CR10XTCR Thermocouple Reference

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 CR10XTCR temperature measurement

should be measured with the AC half bridge (Instruction 5) with the 60 Hz

rejection integration option on the CR10X (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 CR10X Instructions Using AC Half Bridge

01: AC Half Bridge (P5)

01: 1 Rep

02: 22 7.5 mV 60 Hz rejection Range

03: 1 IN Chan

04: 3 Excite all reps w/EXchan 3

05: 2000 mV Excitation

06: 15* Loc [:Ref_Temp]

07: 800 Mult

08: 0 Offset

02: Polynomial (P55)

01: 1 Rep

02: 15* 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.

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