Hamilton Electronics EPHUM011 manual Choose one of the calibration points CP1 or CP2

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pH ARC Sensors Modbus RTU Programmer’s Manual (EPHUM011)

Perform the following steps to do a standard calibration at CP1 and CP2:

Step1: Select the desired set of calibration standards (see chapter 2.7.11)

Step 2: Immerse the sensor into one of the calibration standards available in the selected set

Attention:

It is important that the pH ARC Sensor is immersed in a defined calibration standard at least 3 minutes BEFORE the calibration is started.

Step 3: Choose one of the calibration points CP1 or CP2.

Attention:

The assignment of both CP1 and CP2 to the same pH value is rejected.

Try to avoid the following situations:

For example, the sensor was calibrated earlier at pH 4 (CP1) and at pH 7 (CP2):

You want to perform a new calibration at CP1: it is possible to assign CP1 to pH 4 or to pH 10, but not to pH 7 (already used for CP2).

You want to perform a new calibration at CP2: it is possible to assign CP2 to pH 7 or pH 10, but not to pH 4 (already used for CP1).

If you calibrate now CP1 at pH 10, pH 4 will later be free for selection at CP2. In this case you can calibrate CP2 at pH 4 or pH 7, but not at pH 10 (CP1).

Step 4: Start the calibration (automatic recognition or manual selection)

The calibration is initiated at CP1 by writing to register 5162 or at CP2 by writing to register 5194.

Start	Number of	Reg1 / Reg2	Modbus	Read	Write
register	registers		function code	access	access
5162	2	pH value at CP1 (unit is always pH)	16	none	A/S
5194	2	pH value at CP2 (unit is always pH)	16	none	A/S

Figure 2.7.3.1.3: Definition of register 5162 and 5194. You have two options to enter the pH value: Automatic recognition: pH value=0: the sensor tries to assign the measured electrical potential to

one of the calibration standards available for automatic calibration.

Manual selection: enter the actual pH value at 25°C (the value must be within the tolerance range of the nominal value of one of the calibration standards available for manual selection)

Step 5: Read the calibration status (see chapter 2.7.4)

Step 6: Check the pH ARC Sensor’s quality indicator

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Contents PH ARC Sensors Important Notice Configuration of the Analog Interfaces Configuration of the Serial RS485 InterfaceConfiguration of the Measurement Sensor Identification and InformationVisiferm do Modbus RTU Programmer’s Manualp/n 624179/01 IntroductionEPHUM011 Reading / Setting Operator Level Operator levels and PasswordsGeneral 0x030x30 Changing Passwords for Operator Level0x0C 18111978 0x0B 18111978Device Address Configuration of the serial RS485 InterfaceReading and Writing the Device Address Reading the Device Address LimitsReading and Writing the Baud Rate Baud RateReading the Baud Rate Limits Available Analog Interfaces Configuration of the Analog InterfacesAvailable Analog Interface Modes 0x07Description of the Analog Interfaces 1 Selection of an Analog Interface ModeMA interface #1 MA interface #20x21 Configuration of the 4-20 mA Interface0x01 PH ARC Sensors Modbus RTU Programmer’s Manual EPHUM011 0x001000 Reading the Selected Physical Unit for Analog InterfaceDefining the Measurement Values for 4, 12 and 20 mA Output PH ARC sensor 4-20mA inte rface linear Defining a Constant Current Output for Testing 0x010001 99186 99742 Reading the Internally Measured Output CurrentDefinition of Measurement Channels and Physical Units MeasurementSpecial Description of PMC1 Primary Measurement Channel 1 pHSelecting the Physical Unit for PMC1 0x2010000x1000 02503 0x00 Reading the measurement value of PMC10x200000 175.9922 0x00 954.6541 Description of PMC6 Primary Measurement Channel 6 TemperatureSelecting the Physical Unit for PMC6 0x06Definition of the Measurement Status for PMC1 / PMC6 Input of an Externally Measured TemperatureReading the measurement value of PMC6 0x04 24.35834 0x00 130Description of SMC Secondary Measurement Channels0x8000 247.56 Reading the measurement value of SMCAvailable Parameters Configuration of the MeasurementEffect of Moving Average n=1 vs n=16 2 PA9 Moving AverageSelecting the Physical Unit and Writing the Value for PA9 Description of PA9 Moving AverageReading all Values for PA9 Description of PA12 Moving Average R 3 PA12 Moving Average RSelecting the Physical Unit and Writing the Value for PA12 Reading all Values for PA12 Available Calibration Points CalibrationCalibration Points 1 and 2 Standard Calibration Definitions of Calibration PointsCP1 CP2CP6 Calibration Point 6 Product CalibrationCalibration at CP1 and CP2 Standard Calibration Calibration ProcedurePH ARC Sensors Modbus RTU Programmer’s Manual EPHUM011 Choose one of the calibration points CP1 or CP2 0x00000000 0x00001000 Calibration at CP6 Product Calibration 100200 Product calibration Initial measurement Definition of the commands for product calibrationProduct calibration Assignment Product calibration CancelProduct calibration Restore product calibration Product calibration Restore standard calibrationReading the Calibration Status of CP1 and CP2 Reading the Calibration Status0x00000180 0x00001000 0x00000080 0x00001000Reading the Calibration Status of CP6 Product Calibration 0x08000000 0x00001000 0x01000000 0x000010000x0A000000 0x00001000 0x14000000 0x000010000x10000000 0x00001000 0x00000004 24.35184 23.78 Currently active Calibration Parameters part0x00000004 24.37691 16.45 0x00000004 29.93368 379.5167006804 099747 296.6901 003401 179.927 297.137810469 298.3302 607782 59.47631 298.15Special Commands for Calibration with Visical Available Sets of Calibration Standards Calibration StandardsLSB 0x00000001 Set 0x0000003F180 Definitions for Individual Sets of Calibration Standards0x0FFF0FFF 0x05540FFF 0x02480FFFNist Standard DINMettler Toledo Radiometer Sensor Status Temperature Ranges168.3667 Operating Hours and CountersHistory of Warnings Currently Active WarningsDefinition of Warnings Currently Active Errors ErrorsHistory of Errors Definition of Errors SIP Reading Definition of SIP and CIPCIP 120 130 Reading the Sensor’s Quality IndicatorGeneral Information Sensor Identification and InformationSensor Identification EPHFI0100001001 Free User Memory SpaceFreeuserspace Recall Sensor’s Factory Settings System CommandsHello World 732255PH ARC Sensors Modbus RTU Programmer’s Manual EPHUM011