Apogee MQ-501 Manual del usuario - Página 17

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Error Codes and Fixes

Error codes will appear in place of the real-time reading on the LCD display and will continue to flash until the

problem is corrected. Contact Apogee if the following fixes do not rectify the problem.

Err 1: battery voltage out of range. Fix: replace CR2320 battery and perform master reset.

Err 2: sensor voltage out of range. Fix: perform master reset.

Err 3: not calibrated. Fix: perform master reset.

Err 4: CPU voltage below minimum. Fix: replace CR2320 battery and perform master reset.

Modifying Cable Length

Although it is possible to splice additional cable to the separate sensor of the appropriate MQ model, note that the

cable wires are soldered directly into the circuit board of the meter. Care should be taken to remove the back

panel of the meter in order to access the board and splice on the additional cable, otherwise two splices would

need to be made between the meter and sensor head. See Apogee webpage for further details on how to extend

sensor cable length: (http://www.apogeeinstruments.com/how-to-make-a-weatherproof-cable-splice/).

Unit Conversion Charts

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Apogee MQ series quantum sensors are calibrated to measure PPFD in units of µmol m

. Units other than

photon flux density (e.g., energy flux density, illuminance) may be required for certain applications. It is possible to

convert the PPFD value from a quantum sensor to other units, but it requires spectral output of the radiation

source of interest. Conversion factors for common radiation sources can be found in the Knowledge Base on the

Apogee website (http://www.apogeeinstruments.com/knowledge-base/; scroll down to Quantum Sensors

section). A spreadsheet to convert PPFD to energy flux density or illuminance is also provided in the Knowledge

Base on the Apogee website (http://www.apogeeinstruments.com/content/PPFD-to-Illuminance-Calculator.xls).