MODEL 105T THERMOCOUPLE PROBE
2
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
