RKI Instruments GX-8000(H4-0050) - Manual (Page 15)

3-1. Preparation for span adjustment 3 Span Adjustment
- 15 - GX-8000
Perform adjustment using the procedure shown below.
Warm up the gas monitor for 60 minutes or longer before performing the fresh air
adjustment to ensure more accurate adjustment.
The gases may be introduced in random order.
• Combustible gas (%LEL)
• O
2
gas *1
• CO gas
• H
2
S gas
• N
2
gas
• Combustible gas (vol%)
NOTE
Before starting the adjustment, let the gas monitor draw the gas and wait until the readings are stabilized.
(1) Fresh air adjustment (AIR CAL) *1
(2) Span adjustment (AUTO CAL or ONE CAL) *1
(3) Zero adjustment for high-concentration combustible gases (VOL Z.CAL) (only TYPE-A, E) *1
(4) Span adjustment for high-concentration combustible gases (AUTO CAL or ONE CAL) (only
TYPE-A, E) *1
End of span adjustment
WARNING
When the fresh air adjustment is performed in the atmosphere, check the atmosphere for freshness
before beginning the adjustment. If other gases exist, the adjustment cannot be performed properly,
thus leading to dangers when the gas leaks.
CAUTION
Only Type-A, E
*1 Perform adjustment in the following order: "fresh air adjustment, span adjustment, zero adjustment
for high-concentration combustible gases, and span adjustment for high-concentration combustible
gases.
The sensor for high-concentration combustible gases has different outputs depending on whether the
base gas is air or N2. Performing adjustment in any different order than the above adversely
influences the reading taken when a combustible gas (vol%) is drawn in.