pH ARC Sensors Modbus RTU Programmer’s Manual (EPHUM011)
2.7.10Calibration Standards
2.7.10.1 Available Sets of Calibration Standards
pH ARC Sensors can store and operate six different sets of calibration standards each having max 12 calibration standards. Before calibration the operator has to select one defined set to operate with. Default setting is the HAMILTON set of calibration standards.
The operator can change the selection of sets at any time, without compromising prior calibration data at CP1 / CP2.
In register 9472 the available sets of calibration standards are defined.
Start | Number of | Reg1 / Reg2 | Modbus | Read | Write |
register | registers | (Bit, see Figure 2.7.10.1.2) | function code | access | access |
9472 | 2 | Available calibration standard sets | 3, 4 | U/A/S | none |
Figure 2.7.10.1.1: Definition of register 9472. |
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Bit # |
| Hex value | Description | Definition |
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0 (LSB) |
| 0x00000001 | Set 1 | HAMILTON |
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1 |
| 0x00000002 | Set 2 | MERCK TITRISOL |
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2 |
| 0x00000004 | Set 3 | DIN 19267 |
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3 |
| 0x00000008 | Set 4 | NIST Standard |
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4 |
| 0x00000010 | Set 5 |
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5 |
| 0x00000020 | Set 6 | RADIOMETER |
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Figure 2.7.10.1.2: Definition of available sets of calibration standards. |
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Command: Available cali sets |
| Modbus address: 9472 | Length: 2 |
| Type: 3 | Read | |||
Parameter: |
| Calibration sets |
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Format: |
| Hex |
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Value: |
| 0x0000003F |
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Figure 2.7.10.1.3: Example to read the available calibration sets: Set 1 (0x00000001) + set 2 (0x00000002) + set 3 (0x00000004) + set 4 (0x00000008) + set 5 (0x00000010) + set 6 (0x00000020), in total 0x0000003F.
In register 9474 the selected set of calibration standards is defined.
Start | Number of | Reg1 / Reg2 | Modbus | Read | Write |
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register | registers | (Bit, see Figure 2.7.10.1.2) | function code | access | access |
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9474 | 2 |
| Selected set of calibration standard | 3, 4 | U/A/S | S |
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Figure 2.7.10.1.4: Definition of register 9474. Only one bit can be set. |
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Command: Selected set of cal stand. | Modbus address: 9474 | Length: 2 | Type: 3 | Read | ||||
Parameter: | Calibration set |
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Format: |
| Hex |
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Value: |
| 0x00000001 |
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Figure 2.7.10.1.5: Example to read the selected set of calibration standards. Set 1 (HAMILTON) (0x00000001) is active.
Command: Select set of cal stand. | Modbus address: 9474 | Length: 2 | Type: 16 | Write | |
Parameter: | Calibration set |
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Format: | Hex |
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Value: | 0x04 |
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Figure 2.7.10.1.6: Example to set the calibration standard set to DIN 19267 (0x04).
624300/01 | page 51 / 67 |
