Watts HF Scientific AccUView LED Ex Installation Instructions Manual

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Watts HF Scientific AccUView LED Ex Installation Instructions Manual Manual pdf 8 page image

IS-HF-AccUViewLEDEx-100125 Rev 0 8MeasurementsThis process monitor allows for the measurement of the transmittanceof process water online. Process water is usually reported in %T.Readings above 102 %T are indicated by a flashing display. Readingsabove 100 %T indicate that the current sample is better than thecalibration water. Readings above 110 %T are not possible. Allreadings are path length corrected to 10mm.Measurements can also be taken in Absorbance. Negative Absorbancereadings indicate the need for a calibration or that the water testedis better than what the instrument was calibrated to. These readingsshow ABS on the lower line of the display. All readings are path lengthcorrected to 10mm.Warm-UpThe AccUView LED Ex requires a 30 minute warm-up period. Toimprove the accuracy, allow the AccUView LED Ex to complete warm-up time before calibrating. During the warm-up period, the display mayflash, indicating that it has detected a temperature change. This isnormal operation during the warm-up period.Routine Measurement1. Apply power to the instrument and allow the unit an initial warm upof 30 minutes.2. When a continuous process stream is flowing through theinstrument, the instrument will display the measured %T or ABSlevel of the sample on the LCD screen. In addition, the equivalentsignal is provided on the analog (4-20 mA) output or the digitaloutput, depending on the options selected.Initial OperationBe sure that the cuvette is tightly installed on the flow through unit priorto introducing water to the unit. The cuvettes are pressure checked atthe factory but could have loosened during shipping.The instrument is factory calibrated. However, for the best accuracy,the flow through cuvette should be locked in place and calibrationshould be done with DI water. Refer to next section for completecalibration instructions.Instrument CalibrationThe instrument is calibrated and tested prior to leaving the factory.While it is possible to use the instrument directly out of the box, but forthe most accurate measurements, calibration is recommended beforeinitial use. Under normal conditions, recalibration is recommended atleast once a month. To get the greatest accuracy, calibrating once aweek may be necessary.The two cuvettes supplied with the instrument may be exchanged withone another. One cuvette should always be kept clean for replacementwhen calibrating.The instrument is designed to store the last reading prior to calibrating.The 4-20 mA is held at this stored reading and will not change untilcalibration is complete. 30 seconds after completion of the calibrationthe AccUView LED Ex will start taking online measurements. Thesemeasurements will be averaged with the stored reading (dependingon setting). In order to prevent disruptions in data, the operator shouldrelease the clamp to allow the sample water to flush out the calibrationwater as soon as calibration is complete.While in calibration mode, the instrument has a time-out feature thatautomatically returns the system operation to the AUTO mode after a15-minute period of inactivity.Calibration1. Press the MODE/EXIT one time to enter calibration mode. Thearrow besides CAL will be illuminated. The lower display will showalternating  with either 100 (indicating that 100%T standard isselected) or 0 (indicating that 0.000ABS standard is selected).Once entering calibration mode, the last reading is stored and theequivalent reading is being output on the 4-20 mA signal. Thisoutput will be held after the instrument returns to AUTO, allowingtime for the flow to be restarted.2. Using the shutoff clamp, close off the flow of water.3. Remove the flow through cuvette and retain for future use.4. Fill the second clean cuvette with 100% T calibration fluid andreinstall the filled cuvette tightly on the flow through unit.5. Wipe flow through unit dry, install and lock in place.6. Press the  button to start the calibration.7. The upper display will count down the progress of the calibrationstep. The instrument will return to AUTO mode at the end of thecalibration.8. Release the shutoff clamp to restore sample flow. DO NOT moveor remove flow through cuvette after calibrating.The last reading before calibration may be displayed for at least 30seconds after completing calibration. The length of time it takes toshow the current reading will depend on the response time and lampduty cycle settings.There is no need to recalibrate when changing ranges from %T to ABSor reverse.A flashing display may occur after warm-up. This is anindication that either the ambient or water temperature haschanged rapidly. During this time, the readings may be slightlyout of the specified accuracy. The AccUView LED Ex willautomatically compensate as soon as the rate of temperaturechange slows.NOTICEScreen Display - Calibration Menu (100% T) Screen Display - Calibration Menu (0.000ABS)CAUTION!The UV lamp is very low power but it is recommended to avoidlooking directly into the optical well while the flow through unitis removed.Arrow IndicatesNormal Operation MeasuredReadingMeasurementScale (%T or ABS)Screen Display - Normal Operation