Delta Electronics SS1-UM-1.05 user manual Technical Reference section, Maintenance and repair

Page 64

Technical Reference section

Maintenance and repair

Checking the batteries

The SunScan system requires batteries within the probe and in the Workabout. The Beam Fraction sensor does not require batteries because it draws its power from the probe.

The SunScan probe batteries

The probe is powered by 4 AA size alkaline cells mounted within the probe handle. With typical use, these batteries should last from 6 - 12 months. The probe circuit automatically "sleeps" when no readings are being taken. There is no probe on/off switch.

Checking the probe battery level

Connect the probe to the Workabout, and from the SunData program take a reading with the probe (any light reading will do - it is required only to activate the battery sensing circuit).

Then press ∪ +B (or Menu,Utils,About). The screen display will show various version numbers plus a Battery mV reading.

Replace the batteries if the reading is 4700 mV or less. A reading of 5000 mV or above indicates that the batteries are healthy. You will get an on-screen warning if the batteries are low. When this happens replace them as soon as you can.

If you get a 0 mV reading, the probe has not been read. Take a light reading, and try

∪+B again.

Probe battery life

With a fresh set of batteries in the probe, you could take about 300,000 readings. If you took no readings, the batteries would last for about 6-12 months.

Warning! If you are likely to store the probe for a long period, you should remove the batteries.

Replacing the probe batteries

You must dismantle the probe handle. Disconnect the BFS and the probe's RS232 cable. The baseplate of the probe is secured to the handle by 4 cross-head corner screws. Unscrew these to remove the handle, whilst carefully supporting the probe. The battery holder can now be prised out of its compartment, and the batteries changed.

The Workabout batteries

Checking the Workabout battery levels

The Workabout is supplied with a rechargeable Ni-Cd battery pack and a Lithium back-up battery installed. Press Shift+Ctrl+B to display the Psion Battery info screen. You will be warned when the batteries get low. Switch off and recharge the batteries as soon as possible.

For full details on the care and maintenance of the Workabout's batteries you should refer to the Workabout User Guide pages 2-5, but the following brief notes will get you started.

64 • Technical Reference section

Document code: SS1-UM-1.05

Page 63 Page 65
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Page 63 Page 65
Contents SunScan SS1-UM-1.05Copyright AcknowledgementsTrademarks CE conformityContents Menus and Screens More Psion and file handling notes Measurement optionsLAI theory Technical Reference sectionAppendices IndexHow to use the manuals IntroductionSunScan Canopy Analysis System Organisation of this manualField accessories SunScan probeBeam Fraction sensor Data Collection TerminalPreliminary checks Getting StartedWorkabout and SunScan probe Checking the Workabout hardware Installing the SunData s/w in your PC Installing the s/wSunData s/w Diskette What the s/w doesSetting up your PCs COM port Running SunDataSunScan probe to PC Communication checksWorkabout to PC Running SunData in Windows About this tutorial SunScan TutorialWorking with the Workabout What to do if you get lost Starting SunData in the WorkaboutUsing a PC instead of the Workabout Starting the PC softwareThis page is intentionally blank Setting up a measurement session Working through the menu optionsFile Saving Hot KeysUsing the Emulator mode Taking readingsConnecting the SunScan probe Without a Beam Fraction SensorConnecting the Beam Fraction Sensor Measuring Leaf Area Index without a Beam Fraction Sensor Reviewing your data file AveragesFrom the Workabout Transferring the data file to your PCTo the PC Initiating the file transfer from the Workabout Meanwhile, on the PC RS232 communication problems Conclusion of the TutorialSunData Screens on the Workabout Menus and Screens SettingsFile Contd UtilsQuit More Psion and file handling notes Navigating Psion directories and screensWorkabout User Guide Navigating the Psion directories and screensPsion subdirectory usage in file select dialogs Deleting unwanted Workabout files Re-installing the SunData application iconFlashcards reformatting SunData Configuration files Configuration and data file handlingData memory management Default .cfg Creating a configuration fileRestoring a configuration Data files.PRN file Displaying data files on your PC.CSV file Data file layouts and data groups Page Experiment design Measurement optionsAbove-canopy reference requirements Canopy type and BFS practicalities Canopy Sampling volumeCanopy type and LAI estimates Preferred light and weather conditions Planning for the sun’s positionSetting Eladp Advice on Absorption and Eladp valuesAbsorption Relationship between Mean Leaf Angle and Eladp Estimating Eladp in the fieldSunScan System Measurement modes Workabout setupLAI, PAR and All displays Autolog function Measurement procedures in the field Probe handling in the fieldProbe GO button Levelling the probeUsing the tripod BFS handling in the fieldUse of the tripod WorkaboutLevelling the BFS Finding North, and setting the shade ringExtension cables, and the location of the BFS PAR calibrations Factory light calibrationChecking the probe/BFS matching Recalibrate optionRoutine maintenance and cleaning Restoring the factory calibrationEffect of the shade ring on the BFS Comparing the calibration with other PAR sensorsEnvironmental and moisture protection SunScan probe and Beam Fraction SensorLAI theory Ingredients of the LAI computation methodMajor assumptions Derivation of Wood’s SunScan canopy analysis equationsTheory versus reality Campbells Ellipsoidal LAD equations Beers law for canopy absorptionTransmission of Diffuse Light Transmission fraction τ Is given by I/I0 Modelling the canopy transmission Diffuse light transmission cosine corrected sensorDetail Functions used to model canopy transmission Accuracy of LAI calculationsDiffuse light cosine response sensor Diffuse light hemispherical response sensorModelling incomplete PAR absorption and scattering Exp 0.1 . x . atan 0.9 Atan L Q SpherCalculating zenith angles Scientific referencesSummary Jones, Hamlyn G Plants and Microclimate second edition. CUP Maintenance and repair Technical Reference sectionChecking the batteries SunScan probe batteriesChecking the desiccant Checking the PAR calibration Re-setting the factory calibrationFactory calibration method Troubleshooting Problems running the SunData applicationPsion Workabout While running SunDataInsufficient power to write data reported Technical Support Specifications SunScan Probe Type SS1Beam Fraction Sensor type BF1 Data Collection Terminal type DCT1 Psion WorkaboutCarrying Case type SCC1 Telescopic Tripod type BFT1Spares Kit type SPS1 Logging CablesPAR Performance Spectral responseCosine responses of probe and BFS SunScan system cosine responseAppendices Logging the probe as a Linear Quantum SensorLogging the Beam Fraction sensor Upgrading the SunScan system SunData PC s/wWorkabout SunData s/w Revision HistoryFile transfer between Workabout and PC Choice of different programsPsiWin Workabout Remote LinkExample using Slink Slink and RcomDrives on the PC are referred to as REMA, Remc REM = remote Example using Rcom Documentation of Rcom and SlinkUsing the Workabout Comms application Alternative file transfer mechanismsSending a file to a Communication program Sending a file to a serial printerGlossary Page Index AccuracyIndex Field use 39, 46, 48, 50, 51, 58

SS1-UM-1.05 specifications

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