pH ARC Sensors Modbus RTU Programmer’s Manual (EPHUM011)
2.7.4.2.1Product 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 |
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Format: | Hex | Hex | Float |
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Value: | 0x01000000 | 0x00001000 | 4.01 |
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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 |
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Format: | Hex | Hex | Float |
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Value: | 0x08000000 | 0x00001000 | 4.01 |
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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.
2.7.4.2.2Product calibration: Assignment
Calibration status after invalid assignment:
Command: Calibration status CP6 | Modbus address: 5318 | Length: 6 | Type: 3 | Read | ||
Parameter: | Status | Unit | Value |
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Format: | Hex | Hex | Float |
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Value: | 0x0A000000 | 0x00001000 | 4.01 |
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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 |
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Format: | Hex | Hex | Float |
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Value: | 0x14000000 | 0x00001000 | 4.5 |
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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.
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