Yokogawa DO402 Dissolved Oxygen Analyzer - Manual (Page 52)

IM 12J05D02-01E
5-16 Parameter setting
5-3-2. Temperature functions
Code 10 *T.SENS Select temperature sensor to suit the measuring probe. Refer to instructions
with DO sensor for which temperature sensor is used.
Code 11 *T.UNIT Select °C or °F for temperature display.
Code 12 *T.ADJ Adjust offset in temperature measurement when the sensor is at a stable
known value.
Code 13 *T.MAN Enable and set manual temperature compensation.
After the manual temperature set menu has been displayed, enter
temperature signals and press the [ENT] key to set. If the manual temperature
compensation is enabled, the temperature set menu is displayed in
maintenance mode.
The maximum and minimum slope values that may be entered depend on the nominal current from serv-
ice code 01.
Example : When nominal current = 3.75 µA the maximum and minimum slope calibration values
that may be entered are: Maximum 3.75 x 2 = 7.5 µA
Minimum 3.75 x 0.4 = 1.5 µA
5-3-3. Calibration functions
Code 20 *∆T.SEC Set stability parameters for calibration. A greater time, and/or a smaller step
gives
*∆mg/l greater stability before a calibration can be accepted. Use caution, however, to
avoid very long calibration times.
Code 21 *0.CAL In the DO30G sensor or other galvanic sensors and polarographic sensors,
the zero point fluctuates less than the span. Therefore, with the zero check, a
zero calibration is not required for these sensors provided that they are used in
environments with high-concentration dissolved oxygen such as aerobic tanks.
The zero calibration is recommended when installing sensors, replacing
membranes, or performing measurement in anaerobic tanks with low-
concentration dissolved oxygen.
The two-point calibration (zero and span) is necessary for the DO70G optical
dissolved oxygen sensor because of its operation principle. Select 1 to enable
zero calibration.
NOTE:
The zero point is reset to the default when 0 is set (zero calibration disabled)
even after calibration.
Code 22 *ZERO Zero current values can be entered manually. If a zero calibration is made in
maintenance mode, a zero current value will be automatically reset.
NOTE:
A zero current value is displayed only when a zero calibration is enabled in
code 21.
*SLOPE Slope values can be manually entered with current values. If a span calibration
is made in maintenance mode, slope values will be automatically reset.
NOTE:
Slope values can be displayed with current values. When span check functions
are enabled in code 02, the above current values are converted to % values
and compared with the set values.
Slope % = current sensitive current /reference sensitive current