Campbell 105T Manual de usuario

MODEL 105T THERMOCOUPLE PROBE

INSTRUCTION MANUAL

PRELIMINARY: 31/01/99

WARRANTY AND ASSISTANCE

The MODEL 105T THERMOCOUPLE PROBE is warranted by CAMPBELL SCIENTIFIC

(CANADA) CORP. (“CSC”) 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. CSC's obligation under this warranty is limited to repairing or replacing (at CSC's

option) defective products. The customer shall assume all costs of removing, reinstalling,

and shipping defective products to CSC. CSC will return such products by surface carrier

prepaid. This warranty shall not apply to any CSC 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. CSC is not liable for special, indirect, incidental, or

consequential damages.

Products may not be returned without prior authorization. To obtain a Return Merchandise

Authorization (RMA), contact CAMPBELL SCIENTIFIC (CANADA) CORP., at (780) 454-

2505. An RMA number will be issued in order to facilitate Repair Personnel in identifying

an instrument upon arrival. Please write this number clearly on the outside of the shipping

container. Include description of symptoms and all pertinent details.

CAMPBELL SCIENTIFIC (CANADA) CORP. does not accept collect calls.

Non-warranty products returned for repair should be accompanied by a purchase order to

cover repair costs.

MODEL 105T

THERMOCOUPLE PROBE

1. GENERAL DESCRIPTION

The Model 105T Thermocouple Probe is used

for monitoring the temperature of water or soil.

The 105T is a type T thermocouple consisting

of two wires of dissimilar metals (copper/

constantan) joined at one end. The output

voltage of the thermocouple is a function of this

junction temperature. The -L option on the

Model 105T Thermocouple Probe (105T-L)

indicates that the cable length is user specified.

2. SPECIFICATIONS

Probe

ANSI Thermocouple Type T

Temperature Range up to 50°C

Seebeck Coef 38 µV/°C @ 0°C

Interchangeability -73°C ±0.365°C

20°C ±0.1°C

50°C ±0.25°C

Cable

Conductors 24 AWG

Blue + (Copper)

Red - (Constantan)

Clear Shield

Insulation Extruded TPR

Jacket Extruded TPR

Diameter 0.2 inches

3. INSTALLATION

The 105T is designed for burial in soils or

submersion in water up to 50 feet.

4. WIRING

Connection to Campbell Scientific dataloggers

are given in Tables 1 and 2. Because of the

very small voltage levels, it is recommended

that the 105T be measured differentially.

FIGURE 1. 105T Probe to Datalogger Connections

Blue + Copper

Red - Constantan

Clear Shield

MODEL 105T THERMOCOUPLE PROBE

TABLE 1. Generic Datalogger Connections for Single-Ended Measurements

TABLE 2. Generic Datalogger Connections for Differential Measurements

5. SAMPLE PROGRAM

This section is for users who write their own

datalogger programs. A datalogger program

for measuring this sensor can be created using

Campbell Scientific’s Short Cut Program

Builder software. You do not need to read this

section to use Short Cut. The CR510

Datalogger does not support thermocouple

measurements.

Programming instructions P13 or P14 are used

to measure the voltage of the 105T and convert

it to temperature using the equation for a type

T thermocouple. This equation assumes that

the termination point of the thermocouple

(wiring panel) is at 0°C. Because this is not the

case, we need to obtain the wiring panel

temperature in order to calculate the

temperature of the 105T. There is a thermistor

already located in the wiring panel of the

CR23X, 21X, and CR7 for this purpose.

For the CR10(X) the wiring panel temperature

must be measured using a Thermocouple

Reference Thermistor (CR10XTCR or

CR10TCR). When installed on the CR10(X),

the reference thermistor should lie between the

two analog input terminal strips.

Example 1 program illustrates programming for

the CR10(X) using instruction P11 to measure

the Reference Thermistor and instruction P14

to make a differential measurement of the

105T. Example 2 demonstrates programming

for the CR23X using P17 and P14. Refer to the

datalogger manual under Programming

Instructions P13 and P14 thermocouple

measurements.

For applications including a multiplexer

(AM416, AM16/32, or AM25T), please refer to

the appropriate multiplexer manual.

Description Color CR10(X) CR23X, 21X, CR7

+ Copper Blue Single-Ended Input Single-Ended Input

- Constantan Red AG

Shield Clear G

Description Color CR10(X) CR23X, 21X, CR7

+ Copper Blue Differential Input (H) Differential Input (H)

- Constantan Red Differential Input (L) Differential Input (L)

Shield Clear G

MODEL 105T THERMOCOUPLE PROBE

Example 1. Sample CR10(X) Program using differential measurement instruction

TABLE 3. CR10XTCR or CR10TCR Wiring

Description Color CR10(X)

Signal Red SE 1 (1H)

Excitation Black E3

Signal Reference Clear AG

TABLE 4. 105T-L Wiring for Example 1

Description Color CR10(X)

+ Copper Blue 2H

- Constantan Red 2L

Shield Clear G

;Measure the temperature of the wiring panel on the CR10(X) using the CR10XTCR or CR10TCR.

;This instruction must proceed the measurement of the 105T.

1: Temp (107) (P11)

1: 1 Reps

2: 1 SE Channel

3: 3 Ex Channel Option

4: 1 Loc [ Ref_Temp ]

5: 1.0 Mult

6: 0.0 Offset

;Knowing the wiring panel temperature, we now measure the 105T voltage and use the type T

;equation to calculate the 105T temperature. A multiplier of 1 and offset of 0 yield the

;temperature in °C in input location 2 (TC_Temp).

2: Thermocouple Temp (DIFF) (P14)

1: 1 Reps

2: 21 2.5 mV 60 Hz Rejection Range

3: 2 DIFF Channel

4: 1 Type T (Copper-Constantan)

5: 1 Ref Temp (Deg. C) Loc [ Ref_Temp ]

6: 2 Loc [ TC_Temp ]

7: 1.0 Mult

8: 0.0 Offset

Example 2. Sample CR23X Program Using Differential Measurement Instruction

TABLE 5. 105T-L wiring for Example 2

Description Color CR23X

+ Copper Blue 1H

- Constantan Red 1L

Shield Clear

;Measure the temperature of the wiring panel on the CR23X.

;This instruction must proceed the measurement of the 105T.

1: Panel Temperature (P17)

1: 1 Loc [ Ref_Temp ]

MODEL 105T THERMOCOUPLE PROBE

;Knowing the wiring panel temperature, we now measure the 105T voltage and use the type T

;equation to calculate the 105T temperature. A multiplier of 1 and offset of 0 yield the

;temperature in °C in input location 2 (TC_Temp).

2: Thermocouple Temp (DIFF) (P14)

1: 1 Reps

2: 21 10 mV, 60 Hz Reject, Slow Range

3: 1 DIFF Channel

4: 1 Type T (Copper-Constantan)

5: 1 Ref Temp (Deg. C) Loc [ Ref_Temp ]

6: 2 Loc [ TC_Temp ]

7: 1.0 Mult

8: 0.0 Offset

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