Hach CA610 Manuel De L'utilisateur page 19

Option
Correction
Default Settings
Cell Potential
Celsius
Reaction Delay
PWM Setting
Relay Test
Recrdr
Valve Test
Display Test
6.3 Calibrate the instrument
The instrument does a self-calibration which takes approximately 53 minutes. To set up the
calibration options:
1. Go to the Calibration menu.
2. Set the options.
Option Description
Cal Time Sets the time interval between automatic calibrations. The default is 24 hours. The analyzer
automatically calibrates after the calibration time interval expires. The calibration time interval
starts when the analyzer is turned on or when the calibration time interval setting is changed.
Power loss restarts the calibration time interval. On single-relay systems, the CAL relay is active
during the auto-calibration.
Calib Push ENTER to do a calibration. On single-relay systems, the CAL relay is active.
Default Cal Sets the slope to -58.0 mV; Offset to -15.0 mV; Std 1 to 0.5 mg/L; Std 2 to 5.0 mg/L, and Cal
Time to 24 hours.
Std 1 Sets the value if a different standard is selected for special sampling circumstances.
Std 2 Sets the value if a different standard is selected for special sampling circumstances.
Cal Pt1 Use this value to identify the drift of the electrodes since the previous calibration.
Cal Pt2 Use this value to identify the drift of the electrodes since the previous calibration.
Offset Shows the current offset correction factor. This factor is calculated during calibration. Typical
values are between -100 mV and +100 mV.
Slope Shows the current slope value. Typical values are -53 to -63 mV/decade. New electrodes might
have a slope that is -40 to -50 mV/decade. As the electrode conditions stabilize, the slope value
(calculated during calibration) rises.
Description
Allows entry of a correction factor (a positive or negative value) that can be added to an
analyzer measurement.
Sets the instrument to factory defaults. All user-specified settings are lost.
Differential voltage reading from the electrodes.
Shows temperature of the flow cell.
Shows the amount of the reaction delay that has elapsed.
Heater drive level (0–250).
For two-relay systems: Alternates between ALARM 1 (and the alarm LED illuminated)
and ALARM 2 only. For single-relay systems: ALARM 1 (and the alarm LED illuminated).
Test
Rec Min: Sets Recorder output to 4 mA; Rec Mid: Sets Recorder output to 12 mA; Rec
Max: Sets Recorder output to 20 mA
Energizes Valve 1 or Valve 2.
Displays all LCD segments for 10 seconds.
English 19