pH ARC SensorsModbus RTU Programmer’s Manual (EPHUM011)
624300/01 page 51/ 67
2.7.10 Calibration Standards
2.7.10.1 Available Sets of CalibrationStandards
pH ARC Sensorscan store and operate six different sets of calibration standards each havingm ax 12
calibration standards.Before calibration the operator has to select one defined set to operate with.
Default settingis the HAMILTON set of calibration standards.
The operator canchange the selection of sets at any time, without compromising prior calibration data
at CP1 / CP2.
In register 9472t heavailable sets of calibration standards are defined.
Start
register Number of
registers Reg1/ Reg2
(Bit, see Figure2.7.10.1.2) Modbus
function code Read
access Write
access
9472 2 Available calibration standardsets 3, 4 U/A/S none
Figure 2.7.10.1.1: Definitionof register 9472.
Bit # Hexv alue Description Definition
0 (LSB) 0x00000001 Set1 HAMILTON
1 0x00000002 Set 2 MERCK TITRISOL
2 0x00000004 Set 3 DIN 19267
3 0x00000008 Set 4 NIST Standard
4 0x00000010 Set 5 METTLER-TOLEDO
5 0x00000020 Set 6 RADIOMETER
Figure 2.7.10.1.2:Definition of available sets of calibration standards.
Command: Availablecali sets Modbusaddress: 9472 Length: 2Type: 3Read
Parameter: Calibration sets
Format: Hex
Value: 0x0000003F
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 t otal0x0000003F.
In register 9474t heselected set of calibration standards is defined.
Start
register Number of
registers Reg1/ Reg2
(Bit, see Figure2.7.10.1.2) Modbus
function code Read
access Write
access
9474 2 Selected setof calibration standard 3,4 U/A/S S
Figure 2.7.10.1.4: Definitionof register 9474. Only one bit can be set.
Command: Selectedset of cal stand. Modbus address: 9474 Length:2Type: 3Read
Parameter: Calibration set
Format: Hex
Value: 0x00000001
Figure 2.7.10.1.5: Example to read the selected set of calibration standards. Set 1 (HAMILTON)
(0x00000001)i s active.
Command: Selectset of cal stand. Modbusaddress: 9474 Length: 2Type: 16 Write
Parameter: Calibration set
Format: Hex
Value: 0x04
Figure 2.7.10.1.6:Example to set the calibration standard set to DIN 19267 (0x04).