Hanna Instruments HI 95717C Instruction Manual

Contents

10The flashing digits indicate that:1) the month can be set2) the day can be set“Storage”: this prompt appears for 1 second at the end of thecalibration procedure, to indicate that the calibration data hasbeen stored.“Error”: the concentration of the calibration solution used is not correct.Repeat the calibration procedure with the right standard solution, andverify it is not expired. If the calibration procedure fails again, contact yourdealer or the nearest Hanna Customer Service Center.ERROR MESSAGESa) on zero readingThis indicates that the zeroing procedure failed due to a low signal-to-noise ratio. In this case press ZERO again.“No Light”: the instrument cannot adjust the light level. Please check thatthe sample does not contain any debris.“Light Low”: there is not enough light to perform a measurement. Pleasecheck the preparation of the zero cuvet.“Light High”: there is too much light to perform a measurement. Pleasecheck the preparation of the zero cuvet.b) on sample readingThere is too much light for the sample measurement. Please check if theright sample cuvet is inserted.“Inverted”: the sample and the zero cuvet are inverted.“Zero”: a zero reading was not taken. Follow the instruction in themeasurement procedure for zeroing the meter.11Under range. A blinking "0.00" indicates that the sample absorbsless light than the zero reference. Check the procedure and makesure you use the same cuvet for reference (zero) and measurement.A flashing value of the maximum concentration indicates an overrange condition. The concentration of the sample is beyond theprogrammed range: dilute the sample and re-run the test.A flashing value lower than the maximum concentration indicates alow signal-to-noise ratio condition. In this case accuracy of the resultis not guaranteed. Repeat the measurement procedure.The instructions listed below should be carefully followed during testing to ensure best accuracy.GENERAL TIPS FOR AN ACCURATE MEASUREMENT• Suspended matter in large amounts may causeinterference, therefore this should be removedby prior filtration.• For a correct filling of the cuvet: the liquid inthe cuvet forms a convexity on the top; thebottom of this convexity must be at the samelevel of the 10 mL mark.• It is important that the sample does not containany debris. This would corrupt the reading.• Each time the cuvet is used, the cap must betightened to the same degree.• Whenever the cuvet is placed into themeasurement cell, it must be dry outside, andcompletely free of fingerprints, oil or dirt. Wipeit thoroughly with HI 731318 (tissue forwiping cuvets, see chapter ACCESSORIES) or alint-free cloth prior to insertion.

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