Apogee Instruments PYRANOMETER SP-421 Owner's Manual - Page 18
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18
TROUBLESHOOTING AND CUSTOMER SUPPORT
Independent Verification of Functionality
If the sensor does not communicate with the datalogger, use an ammeter to check the current drain. It should be near 0.6 mA
when the sensor is not communicating and spike to approximately 1.3 mA when the sensor is communicating. Any current
drain greater than approximately 6 mA indicates a problem with power supply to the sensors, wiring of the sensor, or sensor
electronics.
Compatible Measurement Devices (Dataloggers/Controllers/Meters)
Any datalogger or meter with SDI-12 functionality that includes the M or C command.
An example datalogger program for Campbell Scientific dataloggers can be found on the Apogee webpage
at http://www.apogeeinstruments.com/content/Pyranometer-Digital.CR1.
Modifying Cable Length
SDI-12 protocol limits cable length to 60 meters. For multiple sensors connected to the same data line, the maximum is 600
meters of total cable (e.g., ten sensors with 60 meters of cable per sensor). See Apogee webpage for details on how to extend
sensor cable length (http://www.apogeeinstruments.com/how-to-make-a-weatherproof-cable-splice/).
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