Hach 6120118 user manual Cleaning the Sensor, Maintenance

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Maintenance

6.2 Cleaning the Sensor

CAUTION

Before cleaning with acid, determine if the chemical reaction between the acid and the sample will create a hazardous chemical reaction. (For example, do not put a sensor that is used in a cyanide bath directly into a strong acid for cleaning because this chemical combination may produce poisonous cyanide gas.)

DANGER

Acids are hazardous. Always wear appropriate eye protection and clothing in accordance with material safety data sheet recommendations.

1.Clean the exterior of the sensor with a stream of water. If debris remains remove loose contaminate buildup by carefully wiping the entire measuring end of the sensor with a soft clean cloth. Rinse the sensor with clean, warm water.

2.Prepare a mild soap solution of warm water and dish detergent or other non-abrasive soap that does not contain lanolin.

Note: Lanolin will coat the glass process electrode and can adversely affect sensor performance.

3.Soak the sensor for 2 to 3 minutes in the soap solution.

4.Use a small soft-bristle brush and scrub the entire measuring end of the sensor, thoroughly cleaning the electrode and reference junction surfaces. If surface deposits cannot be removed by detergent solution cleaning, use muriatic acid (or other dilute acid) to dissolve them. The acid should be as dilute as possible, do not use stronger than 3% HCL. Experience will determine which acid to use and the appropriate dilution ratio. Some stubborn coatings may require a different cleaning agent. For assistance, contact Technical and Customer Service (U.S.A. only) on page 39.

5.Soak the entire measuring end of the sensor in dilute acid for no more than 5 minutes. Rinse the sensor with clean, warm water then place the sensor back into the mild soap solution for 2 to 3 minutes to neutralize any remaining acid.

6.Remove the sensor from the soap solution, and rinse the sensor again in clean, warm water.

7.After cleaning, always calibrate the measurement system. Refer to section 4.7 on page 25 or section 4.8 on page 29.

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Contents Digital PC sc and RC sc ¾-inch Combination pH/ORP Sensor Page Table of Contents Table of Contents Combination pH and ORP Sensor Specifications SpecificationsDigital Gateway Specifications Page General Information Safety InformationPrecautionary Labels Use of Hazard InformationGeneral Information General Sensor InformationSensor Body Styles Operating Precaution Digital GatewayPage Section Installation Wiring the sc Sensor to the Digital GatewayInstallation Proper Wire Preparation and InsertionWiring the Digital Gateway Cat. No Hard-wiring the Digital Gateway to the sc100 Wiring the Sensor at Terminal Block J5 Terminal Number Terminal Designation Wire ColorConnecting the Sensor to the sc1000 Connecting the Sensor using the Quick-connect FittingsDigital Gateway Dimensions Mounting the Digital GatewayPage User Interface and Navigation Using the sc100 ControllerController Key Functions/Features Number Key FunctionImportant Key Presses User Interface and Navigation Controller Display FeaturesDisplay Display Features Using the sc1000 ControllerUser Interface and Navigation Navigating the Menu Windows Main MenuKeypad List Box Message windowPH Sensor Setup Menu Sensor SetupSensor Diagnostics Menu for pH and ORP OperationConfigure OperationORP Sensor Setup Menu AC FrequencyOne Point Automatic Calibration PH CalibrationTwo Point Automatic Calibration Operation One Point Manual Calibration Two Point Manual CalibrationConcurrent Calibration of Two Sensors for pH and ORP ORP CalibrationOne-point Manual Calibration Adjusting the Temperature Page Maintenance Maintenance ScheduleCleaning the Sensor MaintenanceTroubleshooting the pH or ORP Sensor TroubleshootingError Codes Error CodesPage Item Description Replacement Parts and AccessoriesReplacement Items, Accessories, and Reagent and Standards Catalog NumberPage A. Customers How to OrderTechnical and Customer Service U.S.A. only Information RequiredRepair Service CanadaLimitations Limited WarrantyLimitation of Remedies Page Immunity Product SafetyCompliance Information EmissionsFCC Part 15, Class a Limits Compliance InformationSensor Modbus Registers Appendix a Modbus Register InformationGroup Name Tag Name Register Data Length Description Type Modbus Register Information PH Measurement Theory Appendix B General pH InformationWhere PID Controller Basics General pH InformationIntegral DerivativePage Index
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