HMP45C-L

The SW12V provides a mechanism for older dataloggers that don't have a switched 12V port to control power to the HMP45C. The SW12V is recommended for applications where the HMP45C will be measured by a CR500, CR510, 21X, CR7, or a CR10 with a silver wiring panel.

History: prior to May 2004, the HMP45C cable included a switching circuit that switched power to the sensor only during measurement, fhus conserving system power. Effective 3 May 2004, the switching circuit was removed from the HMP45C cable. The redesigned HMP45C connects to the datalogger's switched 12 V terminal. Dataloggers that do not have a switched 12 V terminal (i.e., CR500, CR510, 21X, CR10 with a silver wiring panel, or a CR7) can use a SW12V Power Switch Assembly to switch power to the HMP45C.

The 41003-5 provides a 10-plate naturally-aspirated radiation shield that houses one HMP45C probe. Its louvered construction allows air to pass freely through the shield thereby keeping the probe at or near ambient temperature. The 41003-5 attaches to a crossarm, mast, or user-supplied pipe with a 1.0" to 2.1" OD.

Order the 16559 to have Campbell Scientific recalibrate an HMP45C temperature/RH probe to original specifications. Reference vapor stream is generated by LI-COR Model 610 Dewpoint Generator and is accurate to ±0.2°C dew point. Recalibration is performed at room temperature at 20%, 50%, and 90% RH. Before and after calibration sheets are supplied. O-ring seals are replaced as required. All factory recalibrations require an RMA (Returned Material Authorization).