Operation
|
3-5
20% hydrogen in air is explosive. Vent the gas from the outlet outdoors,
if possible. Always make sure that the workplace is well-ventilated.
Figure 3-2.
SPAN ADJUST - for
calibration only.
Displays % H2
(No Backlight)
Displays % H2
(Backlight)
Electrical Zero
Adjustment Screw
Displays
Sensor Current
(Backlight)
Current Adjustment
Knob
4
1
CURRENT ADJUST
SPAN ADJUST
(FOR CALIBRATION ONLY)
6.
SPAN ADJUST
Do not perform this adjustment except during a calibration.
Make sure that Knob 1 is in the
TEST
position.
Using a screwdriver, adjust the
SPAN ADJUST
(Figure 3-2) so that the
digital display reads a concentration identical to the calibration test
gas value.
Turning the screw clockwise will increase the display value in %H
2
.
Turning the screw counter-clockwise will decrease the display value in
%H
2
.
7. Repeat until the Zero and Span readings remain constant and un-
changed and the calibration reading is within the repeatability specifi-
cation (±0.5% H
2
).
8. The analyzer is now calibrated.
NOTE
