Model 109SS Temperature Probe

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.

5.1 CRBasic

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).

5.1.1 CRBasic Examples

TABLE 5-1. Wiring for Example

Programs

 

 

CR200

Color

Description

CR1000

CR5000

 

 

 

 

 

 

 

 

 

 

Black

Excitation

EX1 or VX1

 

 

 

 

 

 

 

 

 

 

Red

Signal

SE1

 

 

 

 

 

 

 

 

 

 

Purple

Signal Ground

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Clear

Shield

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5