<5. Parameter setting>
5-16
IM 12J05D02-01E
5.3.3
Calibration functions
Code 20 *ΔT.SEC Set stability parameters for calibration. A greater time, and/or a smaller
step gives
*Δmg/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
lowconcentration 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
Code Display
Function
Function detail
X Y Z Default values
Temperature Measuring Functions
10
*T.SENS Temp. Comp.
Pt100 RTD
0
1
Pt1000 RTD (DO30)
1
PB36 = 2k2 NTC
2
22k NTC (SM31) (DO70G)
3
11
*T.UNIT
Temp units
Celsius
0
0
Fahrenheit
1
12
*T.ADJ
Temp adjust
Adju/- 7.5 °C or +/- 13.5 °F
13
*T.MAN
Manual TC
Automatic temperature comp
0
Manual temp compensation
25 °C/ 77 °F
14-
19
Not used
9th Edition: Aug. 05, 2015-00
Содержание EXA DO402G
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