46 • Chapter 5: User Mode and Calibration
SC-04
2. Press and release POWER MODE. The
AIR
item appears.
3. Use AIR to scroll to the
E-CAL
item.
4. Press and release POWER MODE. The display shows the gas and its assigned calibration
value (see pg.47 if the calibration value does not match the calibration gas cylinder’s
concentration).
5. Press and release POWER MODE.
6. The gas reading flashes and the bottom of the screen says “GAS IN”.
7. For toxic gas cylinders, it is important to vent the regulator while installing it onto the
cylinder. Venting the regulator during installation helps prevent air from getting into the
cylinder and degrading the gas. Open the regulator by turning the knob counterclockwise
and install it onto the cylinder.
8. Once the gas reading reaches 10% of the auto calibration value, the screen starts counting
down from the time specified in the
E-CAL
User Mode item. In the example below,
E-
CAL
is set to
60
seconds.
NOTE:
RKI Instruments recommends an
E-CAL
setting of 120 seconds for Cl
2
and NH
3
and 60 seconds for all other gases.
To back out of the gas application screen without performing the calibration, press and
release AIR and POWER MODE together.
If the reading never reaches 10% of the auto calibration value, press and release POWER
MODE to fail the calibration.
9. At the end of the countdown, the instrument makes the span adjustment.
E-CAL
SO2
5.00
E-CAL
ppm
SO2
0.00
GAS IN
ppm
SO2
0.50
CAL 60
ppm
SO2
0.50
APLY 60
ppm