109-L

Datalogger Considerations

The 109 was designed specifically for our CR200(X)-series dataloggers. Other dataloggers may measure the 109 probe, but the 107 and 108 temperature probes are more often used for dataloggers that can measure them.

Programming

The instruction set for our CR200(X)-series, CR800-series, CR1000, and CR3000 dataloggers contains the Therm109 instruction for measuring the 109 probe. Programming is more complicated for other dataloggers because they must use generic measurement instructions.

Compatible Contemporary Dataloggers

CR200(X) Series	CR800/CR850	CR1000	CR3000	CR5000	CR7X	CR9000X

Compatible Retired Dataloggers

CR500	CR510	CR10	CR10X	21X	CR23X	CR9000

Installation Considerations

Air Temperature

When exposed to sunlight, the 109 must be housed in a radiation shield. It is typically housed in a 41303-5A 6-plate naturally aspirated shield. It may also be housed in a 41003-5 10-plate shield if a 41322 Adapter Plate is used. The radiation shield mounts to a mast, tower leg, or crossarm.

Soil Temperature

The 109 is suitable for shallow burial only. Placement of the cable inside a rugged conduit may be advisable for long cable runs—especially in locations subject to digging, mowing, traffic, use of power tools, or lightning strikes.

Water Temperature

The 109 can be submerged to 50 ft. Please note that the probe is not weighted. Therefore, the installer should either add a weighting system or secure the probe to a fixed, submerged object, such as a piling.