50 • Chapter 5: User Mode and Calibration HS-04 Operator’s Manual
Performing a Span Adjustment in E-CAL
The E-CAL item only appears if E-CAL in User Mode is set to ON (factory setting is OFF). If
E-CAL is set to OFF, see page 46 for calibration instructions.
Preparing for Span Adjustment
To adjust the span on the HS-04, you need:
• Calibration gas cylinder
• 0.25 LPM fixed flow regulator
• Non-absorbent tubing
• Calibration cup
1. Confirm that the HS-04’s calibration gas value matches the concentration listed on the
calibration gas cylinder as described on page 53.
2. Confirm that the regulator knob is turned all the way clockwise. Screw the 0.25 LPM fixed
flow regulator onto the calibration cylinder.
3. Install the calibration cup onto the HS-04. Be sure the calibration cup is installed in the correct
direction and that it is pushed on all the way.
4. Use the tubing to connect the regulator to the inlet of the calibration cup (labeled “IN”).
Table 10: Calibration Concentration Limits
Channel
Min. Cal.
Concentration
Max. Cal.
Concentration
Hydrogen Sulfide 1.0 ppm 200.0 ppm
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