Model 109SS Temperature Probe
The datalogger is programmed using either CRBasic or Edlog. Dataloggers
that use CRBasic include our CR200(X)-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(X)-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
Color
Description
CR200(X)
CR1000
CR5000
Black
Excitation
EX1 or VX1
Red Signal
SE1
Purple
Signal Ground
Clear Shield
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