RKI Instruments HS-04 - Page 51

HS-04 Operator’s Manual Chapter 5: User Mode and Calibration • 51
Performing a Calibration
1. While in User Mode, press AIR to scroll to GAS CAL.
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 calibration value (see page 53 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. Turn the regulator knob counterclockwise to open the regulator.
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.
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.
GAS CAL
E-CAL
H2S
50.0
E-CAL
ppm
H2S
0.0
GAS IN
ppm
H2S
12.0
CAL 60
ppm
H2S
12.0
APLY 60
ppm