40 • Chapter 5: User Mode and Calibration HS-04 Operator’s Manual
4. If PASS-W is set to ON in User Mode, a password screen appears and the first digit flashes.
The factory-set password is 0405 but it can be changed.
5. Use AIR to select each password number then press POWER MODE to save it and move on
to the next number. To go back a number, press and hold AIR and POWER MODE for a few
seconds. To reverse the direction of change (ie. from increasing to decreasing or vice versa):
a. Press and hold AIR.
b. Immediately press POWER MODE and then release both buttons.
6. The BUMP item displays.
7. Use AIR to move through the User Mode items.
Tips for Using User Mode
• To scroll from one item to the next, press and release AIR. To reverse the scrolling direction:
a. Press and hold AIR.
b. Immediately press POWER MODE and then release both buttons.
c. The scrolling direction returns to the original direction when you exit and reenter a menu.
• To skip an item when a question is asked, press and release AIR.
• To enter an item and to save any changes, press and release POWER MODE.
• To change a flashing parameter, press and release AIR. To reverse the direction of change (ie.
from increasing to decreasing or vice versa):
a. Press and hold AIR.
b. Immediately press POWER MODE and then release both buttons.
• To exit an entered item without saving a change, press and hold AIR and POWER MODE for a
few seconds.
Performing a Bump Test (BUMP)
Bump test the instrument before each day’s use with a known concentration of the target gas. The
instrument does not need to be calibrated unless it does not pass the bump test.
To bump test the HS-04, you need:
• Calibration gas cylinder (RKI Instruments recommends using 25 ppm H
2
S, but any value
between 1.0 ppm and 200.0 ppm can be used)
• 0.25 LPM fixed flow regulator
• Non-absorbent tubing
• Calibration cup
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