Instruction manual

SM425 INSTRUCTION MANUAL 9.0 CALIBRATION
9.1.4 Data Retained During Calibration
Calibration data and the sensor status data listed below are acquired during calibration. However, if the
calibration fails (an error occurs during automatic or semi-automatic calibration), this data is not retained.
This data can be observed by selecting the detailed data display key from the basic panel display. For an
explanation and the operating procedures of individual data, consult Section 1.53.1, “Detailed Display.”
1. Record of span correction factor: Records the past ten span correction factors.
2. Record of zero correction factors: Records the past ten zero correction factors.
3. Response time: Response is calculated during two-point calibrations in semi-automatic or
automatic calibration modes. It is not calculated for one-point calibrations or in manual calibration
mode.
4. Cell’s resistance: The cell’s resistance is updated during calibrations other than span-only
calibrations. This value includes the cell’s internal resistance as well as other wiring resistances.
The cell’s internal resistance gradually increases as the cell ages but the degree of a cell’s
degraded performance cannot be determined from this value alone.
5. Robustness of a cell: The robustness of a cell is a number from one to four predicting the
remaining life of a sensor.
9.2 Calibration
Calibration should be made under normal operating conditions (for example, if the probe is connected
to a furnace, the analyzer should undergo calibration of the operating conditions of the furnace). To make
a precise calibration, conduct both zero-point and span calibrations.
9.2.1 Calibration Settings
The following paragraphs describe the calibration settings available on the “Calibration Setup Display”. To
select the “Calibration Setup Display” follow these steps:
1. Select the Setup key from the basic panel display screen. Then select Maintenance from the
Execution/Setup display screen.
2. Select Calibration setup from the Maintenance display screen.
9.2.1.1 Selecting Calibration Modes
There are three calibration modes available:
1. Manual calibrations are controlled by the touch pad. One-point and two-point calibrations can be
performed.
2. Semi-automatic calibration is initiated by the touch panel or a contact input. A series of calibration
operations following preset calibration periods and stabilization time are iniated
3. Automatic calibration is initiated by the start time, start date and interval settings selected in the
calibration timing display.
Calibrations are limited by the following mode selection:
• When manual calibration is selected:
146 42500001 REV A