Campbell Manufacturing TEMPERATURE PROBE 109SS User Manual

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

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. 

In the CR200-series, CR800, CR850, CR1000, and CR3000 dataloggers, 
Instruction Therm109 is used to measure temperature.  Therm109 provides 
excitation, makes a single ended voltage measurement, and calculates 
temperature.   

The Therm109 instruction has the following form: 

Therm109 (Dest, Repetitions, SE Chan, Ex Chan, Multiplier, Offset) 

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.  Sections 5.1.1.1 and 
5.1.1.2 provide example programs that use the Therm109 instruction. 

The CR5000 and CR9000(X) use the BrHalf instruction to read the 109SS’s 
resistance.  The Steinhart-Hart equation is entered as an expression to convert 
the resistance to degrees Celsius (see Section 5.1.1.3). 

Black 

Excitation  

EX1 or VX1 

Red Signal 

 

SE1 

Purple 

Signal Ground  

 

 

Clear Shield