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pH ARC Sensors Modbus RTU Programmer’s Manual (EPHUM011)
624300/01 page 46 / 67
2.7.4.2.1 Product calibration: Initial measurement
Calibration status after initial measurement command under conditions outside the valid calibration
range for CP6 (defined in register 5312):
Command: Calibration status CP6
Modbus address: 5318 Length: 6 Type: 3
Read
Parameter: Status Unit Value
Format: Hex Hex Float
Value:
0x01000000 0x00001000 4.01
Figure 2.7.4.2.1.1: Example to read the calibration status of CP6 after having performed an initial
measurement at CP6 under measurement conditions outside the calibration range for CP6.
The status says: “CP6: out of calibration range”(0x01000000). The last successful calibration
has been performed at pH 4.01.
The initial measurement in this case was not successful.
The sensor is still running on its prior standard calibration.
Calibration status after successful initial measurement:
Command: Calibration status CP6
Modbus address: 5318 Length: 6 Type: 3
Read
Parameter: Status Unit Value
Format: Hex Hex Float
Value:
0x08000000 0x00001000 4.01
Figure 2.7.4.2.1.2: Example to read the calibration status of CP6 after having performed an initial
measurement at CP6 under correct measurement conditions.
The status says: “CP6: initial measurement”(0x08000000). The last successful calibration has
been performed at pH 4.01.
The initial measurement in this case was successful.
The sensor is still running on its prior standard calibration until a valid calibration value has been
assigned to this initial measurement values.
2.7.4.2.2 Product calibration: Assignment
Calibration status after invalid assignment:
Command: Calibration status CP6
Modbus address: 5318 Length: 6 Type: 3
Read
Parameter: Status Unit Value
Format: Hex Hex Float
Value:
0x0A000000 0x00001000 4.01
Figure 2.7.4.2.2.1: Example to read the calibration status of CP6 after having performed a valid initial
measurement at CP6 and an invalid assignment.
The status says: “CP6: out of range”(0x02000000) and “CP6: initial measurement”
(0x08000000). The last successful calibration has been performed at pH 4.01
The initial measurement in this case is still valid and available for further assignment of a product
calibration value. The here performed assignment was not successful. The sensor remains
running on its prior standard calibration.
Calibration status after valid assignment:
Command: Calibration status CP6
Modbus address: 5318 Length: 6 Type: 3
Read
Parameter: Status Unit Value
Format: Hex Hex Float
Value:
0x14000000 0x00001000 4.5
Figure 2.7.4.2.2.2: Example to read the calibration status of CP6 after having performed an initial
measurement at CP6 and a valid assignment to pH 4.5.
The status says: “CP6: active”(0x04000000) and “CP6: assigned”(0x10000000). The last
successful calibration corresponding to the here performed assignment has been performed at
pH 4.5.