1066 Liquid Analytical Transmitter - Emerson Process Management

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Section 9: CalibrationSeptember 20131066 Instruction ManualLIQ_MAN_1066slope of the calibration curve. Because stable total chlorine standards do not exist, the sensor mustbe calibrated against a test run on a grab sample of the process liquid. Several manufacturers offerportable test kits for this purpose.To calibrate the chlorine sensor, access the Calibration screen by pressing ENTER from the mainscreen, and press ENTER.The following calibration routines are covered:1. Zero Cal Zeroing the sensor in solution with zero total chlorine2. Grab Cal Standardizing to a sample of known total chlorine concentrationTo calibrate total chlorine:1. Press the MENU button2. Select Calibrate. Press ENTER.3. Select Total Chlorine. Press ENTER.The adjacent screen will appear. To calibrate Total Chlorine orTemperature, scroll to the desired item and press ENTER1.234µS/cm 25.0ºCSN Calibrate?Total ChlorineTemperatureThe following sub-sections provide you with the initial display screen that appears for each calibrationroutine. Use the flow diagram for Chlorine calibration at the end1.234µS/cm 25.0ºCof Sec. 9 and the live screen prompts to complete calibration.SN CalibrationZero CalThis adjacent screen appears after selecting Total Chlorine calibration:In Process Cal9.6.2.1Zeroing the SensorThe adjacent screen will appear during Zero Cal. Be sure sensor has beenrunning in zero solution for at least two hours before starting zero step.The adjacent screen will appear if In Zero Cal is successful. The screen willreturn to the Amperometric Cal Menu.1.234µS/cm 25.0ºCSN Zero CalZeroingWait1.234µS/cm 25.0ºCSN Zero CalSensor zero doneThe adjacent screen may appear if In Zero Cal is unsuccessful. The screenwill return to the Amperometric Cal Menu.1.234µS/cm 25.0ºCSN Zero CalSensor zero failedPress EXIT9.6.2.2In Process CalibrationThe adjacent screen will appear prior to In Process CalIf the In Process Cal is successful, the screen will return to the Cal submenu.The adjacent screen may appear if In Process Cal is unsuccessful. Thescreen will return to the Amperometric Cal Menu.1.234µS/cm 25.0ºCSN InProcess CalWait for stablereading.1.234µS/cm 25.0ºCSN InProcess CalCalibration errorPress EXIT82 Calibration
1066 Instruction Manual Section 9: CalibrationLIQ_MAN_1066 September 20139.6.3Calibration – MonochloromineA monochloramine sensor generates a current directly proportional to the concentration ofmonochloramine in the sample. Calibrating the sensor requires exposing it to a solution containingno monochloramine (zero standard) and to a solution containing a known amount of monochloramine(full-scale standard). The Zero calibration is necessary because monochloramine sensors,even when no monochloramine is in the sample, generate a small current called the residualor zero current. The transmitter compensates for the residual current by subtracting it from themeasured current before converting the result to a monochloramine value. New sensors requirezeroing before being placed in service, and sensors should be zeroed whenever the electrolytesolution is replaced. The best zero standard is deionized water. The purpose of the In Process calibrationis to establish the slope of the calibration curve. Because stable monochloramine standardsdo not exist, the sensor must be calibrated against a test run on a grab sample of the processliquid. Several manufacturers offer portable test kits for this purpose.To calibrate the chlorine sensor, access the Calibration screen by pressing ENTER from the mainscreen, and press ENTER.The following calibration routines are covered:1. Zero Cal Zeroing the sensor in solution with zero total chlorine2. Grab Cal Standardizing to a sample of known monochloramine concentrationTo calibrate monochloramine:1. Press the MENU button2. Select Calibrate. Press ENTER.3. Select Monochloramine. Press ENTER.The adjacent screen will appear. To calibrate Monochloramine orTemperature, scroll to the desired item and press ENTER.1.234µS/cm 25.0ºCSN Calibrate?MonochloramineTemperatureThe following sub-sections provide you with the initial display screen that appears for each calibrationroutine. Use the flow diagram for Chlorine calibration at the end of Sec. 9 and the livescreen prompts to complete calibration.The adjacent screen appears after selecting Monochloramine calibration:1.234µS/cm 25.0ºCSN CalibrationZero CalIn Process CalCalibration 83
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