Manual

8 Maintenance 8-2. Gas calibration method
GD-70D - 66 -
<Span Adjustment "2-2">
This is used to perform the span adjustment. For the oxygen deficiency alarm specification (OSU - 0 - 25
vol%), this is the same as "1-1".
Span Adjustment Display
PW A1 A2 F LCD
2-2.SPAN
Press the SET key.
● ○ ○ ○
2-2
SPAN
MAINTENANCE
↓ ↓
Gas Introduction
Introduce a gas, and then press the SET
key when the reading is stabilized.
* In case of less than 10%FS, this is not
switched to the next menu.
● ○ ○ ○
2.0ppm
SPAN GAS
MAINTENANCE
↓ ↓
● ○ ○ ○
8.0ppm
SPAN VAL
MAINTENANCE
Span Adjustment
Because the reading will be fixed, select
the introduced gas concentration by
pressing the ▲ or ▼ key. Select the
number, and then press the SET key.
(20.9 vol% in the oxygen deficiency alarm
specification)
↓ ↓
Span Adjustment Completed
● ○ ○ ○
8.0ppm
SPAN OK
MAINTENANCE
↓ ↓
Adjustment result record
To record the adjustment result, press the
SET key.
(Press the MODE key to cancel this menu.)
● ○ ○ ○
8.0ppm
SPAN Y/N
MAINTENANCE
↓ ↓
Adjustment Completed
The menu returns to 2-2.SPAN
automatically.
● ○ ○ ○
8.0ppm
SPAN END
MAINTENANCE
↓
Return to 2-2.SPAN
* When the span adjustment fails
● ○ ○ ○
8.0ppm
SPAN NG
MAINTENANCE
↓
Return to 2-2.SPAN
CAUTION
Do not press the
SET key before the
readin
g
is stabilized.
CAUTION
Exhaust gas must be collected
in the exhaust bag or discharged
through the exhaust line.