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6 Troubleshoong ............................................... 27
6.1 Hardware .............................................. 27
6.1.1 Message HIGH INTERNAL HUMIDITY . . . . . . . . . . . . . . . . . . . . . . . 27
6.1.2 Message HIGH INTERNAL TEMP . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
6.2 Measurement ........................................... 27
6.2.1 Message OUTSIDE LIGHT ERROR or OUTSIDE LIGHT TO PRISM . . . 27
6.2.2 Message NO OPTICAL IMAGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
6.2.3 MessagePRISMCOATED ................................. 28
6.2.4 Message LOW IMAGE QUALITY . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
6.2.5 MessageNOSAMPLE ................................... 29
6.2.6 Message TEMP MEASUREMENT FAULT . . . . . . . . . . . . . . . . . . . . . 29
6.2.7 Concentraon dri during NORMAL OPERATION . . . . . . . . . . . . . . 29
6.3 Diagnosc messages table ................................. 29
7 Principleofmeasurement ....................................... 30
8 Ethernet protocol specicaon . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
8.1 Communicaon protocol .................................. 32
8.1.1 Requestformat ........................................ 32
8.1.2 Responseformat ....................................... 33
8.1.3 Request and response errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
8.2 Request-response pair specicaon ......................... 34
8.2.1 NULLmessage ......................................... 34
8.2.2 Protocolversion ....................................... 34
8.2.3 Refractometer informaon . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
8.2.4 Measurementresults ................................... 35
8.3 Error message specicaon ................................ 36
9 Instrumentvericaon .......................................... 37
9.1 Refractometer vericaon ................................. 37
9.1.1 HandlingtheR.I.liquids ................................. 38
9.2 Vericaon procedure .................................... 38
9.3 Correcve acon ........................................ 40
A PR-43 refractometer eld calibraon form . . . . . . . . . . . . . . . . . . . . . . . . . . 41
B EU declaraon of conformity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
