pH ARC SensorsModbus RTU Programmer’s Manual (EPHUM011)
624300/01 page 38/ 67
Examples: (Definitionsof register 5158 and 5190 used in these examples are given in chapter 2.7.4.1,
thosef or register4872 in chapter 2.8.6)
Example to calibrateat CP1 with automatic recognition:
Command: Make calibrationCP1 Modbusaddress: 5162 Length: 2Type: 16 Write
Parameter: pHv alue
Format: Float
Value: 0
Figure 2.7.3.1.4: Example to start the calibration at CP1, setting a value of 0 for automatic
recognition ofthe calibration standard.
Example to calibrateat CP2 with automatic recognition:
Command: Make calibrationCP2 Modbusaddress: 5194 Length: 2Type: 16 Write
Parameter: pHv alue
Format: Float
Value: 0
Figure 2.7.3.1.5: Example to start the calibration at CP2, setting a value of 0 for automatic
recognition ofthe calibration standard.
Example to readthe calibration status of CP1:
Command: Calibrationstatus CP1 Modbusaddress: 5158 Length: 6Type: 3Read
Parameter: Status Unit Value
Format: Hex Hex Float
Value: 0x00000000 0x00001000 4.01
Figure 2.7.3.1.6: Example to readt hecalibration status of CP1 after calibration CP1 at 0 = auto.
All bits of CP1 are zero (0x00000000), indicating that the calibration was successful. The
physical unit of the last calibration is pH (0x00001000) and the assigned pH value is 4.01
at 25°C.
Example to readthe calibration status of CP2:
Command: Calibrationstatus CP2 Modbusaddress: 5190 Length: 6Type: 3Read
Parameter: Status Unit Value
Format: Hex Hex Float
Value: 0x00000000 0x00001000 7
Figure 2.7.3.1.7: Example to readt hecalibration status of CP2 after calibrating CP2 at 0 = auto.
All bits of CP2 are zero (0x00000000), indicating that the calibration was successful. The
physical unit of the last calibration is pH (0x00001000) and the pH value is 7.
Example to calibrateat CP1 with manual selection of the calibration standard:
Command: Make calibrationCP1 Modbusaddress: 5162 Length: 2Type: 16 Write
Parameter: pHv alue
Format: Float
Value: 4.00
Figure 2.7.3.1.8: Example to start the calibration at CP1, by means of manually selecting the
calibration standardHAMILTON DURACAL4.01 (nominal value 4.01). The operator knows
from the certificateof the specific production lot that the actual pH value is 4.00.