1. Purpose

This document outlines the calibration procedure for the HGS-100 NH₃ (GTD-2000Tx) Ammonia Gas Detector, ensuring accurate detection and proper functionality.

2. Required Tools and Equipment

• Calibration Gas (Zero and Span Gas)
• Magnetic Wand (for menu navigation)
• Multimeter (if needed)
• 6mm OD Tubing
• HGS-100C Control Unit

3. Calibration Procedure

Step 1: Enter Calibration Mode

1. On the HGS-100C Control Unit, navigate to the menu:
   • F4.UTIL → F1.DT.MOD → F2.DT.CAL → Input password (1234) → Enter detector number → Press "↵".

       2. Select the corresponding detector number for NH₃ Gas Detector:

• • No.5: NH₃ Gas Detector

Step 2: Zero Calibration

       1. Touch the FUNC switch with the magnet bar for over 2 seconds to enter PASSWORD MODE.

       2. Touch FUNC again to enter Menu Selection Mode.

       3. Use ▲ or ▼ to select CALIBRA. MODE, then press FUNC to confirm.

       4. Select ZERO and press FUNC to enter Zero Calibration Mode.

       5. Use ▲ or ▼ to select YES, then press FUNC.

       6. Once the reading stabilizes, press FUNC. The LCD will display "ZERO GAS SUCCESS" for over 2                 seconds, then transition to CAL DATA MODE.

Step 3: Span Calibration

       1. Use ▲ or ▼ to select SPAN, then press FUNC to enter Span Calibration Mode.

       2. Use ▲ or ▼ to select YES, then press FUNC.

       3.Turn the 3-way ball valve to calibration mode and connect the regulator (O.D 6mm tubing).

       4. Insert span gas for 2 minutes and wait for stabilization.

       5. When the displayed value stabilizes, press FUNC to enter SPAN SET MODE.

       6. Adjust the standard gas value using ▲ or ▼.

       7. Press FUNC to confirm. The LCD will display "SPAN SET SUCCESS" for over 2 seconds, then                     transition to CAL DATA MODE.

       8. The detector will display the measured value for verification. Press FUNC to proceed.

       9. Press RESET to complete the calibration process.

Step 4: Exit Calibration Mode

1. Select Exit, Save Configuration on the HGS-100C Control Unit LCD display.
2. Press Enter "↵", then press NO key "F4", and confirm with Enter "↵".
3. Press RETURN Key "F6" three times repeatedly to exit the menu.

⚠️ Caution: Return all valves to their original position after calibration.

4. Post-Calibration Verification

• Verify that the detector readings are within the expected range.
• Ensure the gas detector alarm thresholds function correctly.