GTYO-HK301 point combustible gas detector

nstallation and Operation Manual for GTYQ-HK301 Point-Type Combustible Gas Detector​

​I. Safety Precautions​

1. Read and fully understand this manual before installing, commissioning, or operating the detector.
2. ​Never open the detector cover in environments with flammable gases or vapors.​​ Use a portable combustible gas detector to verify the absence of hazardous gases. Perform regular calibration and maintenance.
3. Inspect and clean the detector’s air inlet periodically to prevent blockages from dust or debris, which may impair accuracy.
4. ​Do not test the detector using pure gas or high-concentration gas.​​ This may cause sensor carbon buildup, leading to inaccuracy, reduced sensor lifespan, or permanent damage.
5. Ensure the detector is properly grounded to avoid radio frequency interference. Use the designated grounding point on the device. All shielding layers must be reliably grounded at the controller’s star grounding point or the detector’s grounding point. Handle sensors with care, as they may contain corrosive solutions.
6. Avoid exposing the sensor to temperatures beyond the recommended range or immersing it in organic solvents/flammable liquids.
7. Use explosion-proof cable glands with appropriate certification matching the detector’s explosion-proof rating.

​II. Product Overview​

1. The detector features a rugged explosion-proof aluminum alloy housing with two M20×1.5 cable entry ports. Designed for industrial/commercial monitoring of combustible gases, it connects to compatible controllers for networked monitoring.
2. Utilizes LBUS 4-wire communication for real-time transmission of gas concentration, fault, and alarm data. Includes one alarm relay output and one audible/visual alarm output.
3. Equipped with an imported high-precision gas sensor with intelligent high-concentration flood protection.
4. Modular sensor unit allows field replacement without recalibration.

​III. Compliance Standards​

• GB15322.1-2019: Combustible Gas Detectors Part 1: Point-Type Detectors for Industrial and Commercial Use
• GB/T3836.1-2021: Explosive Atmospheres Part 1: General Requirements for Equipment
• GB/T3836.2-2021: Explosive Atmospheres Part 2: Equipment Protected by Flameproof Enclosure “d”
• GB/T3836.31-2021: Explosive Atmospheres Part 31: Equipment Protected by Dust-Ignition-Proof Enclosure “t”

​IV. Technical Specifications​

• ​Detection Principle: Catalytic combustion
• ​Accuracy: ±3% LEL
• ​Detectable Gases: Methane, Hydrogen, Propane, Isobutane
• ​Sampling Method: Diffusion
• ​Response Time (T90)​: ≤30 sec
• ​Operation: Infrared remote control
• ​Power Supply: DC24V±6V
• ​Range: 3% LEL to 100% LEL
• ​Output: LBUS 4-wire
• ​Power Consumption: ≤2.5W
• ​Sensor Lifespan: 2 years (typical)
• ​IP Rating: IP66
• ​Cable Entry: M20×1.5 internal thread
• ​Weight: 1.2 kg
• ​Dimensions: 175mm × 140mm × 84mm
• ​Material: Cast aluminum alloy, explosion-proof glass
• ​Alarm Thresholds:
  • Low Alarm: 25% LEL (factory default)
  • High Alarm: 50% LEL (factory default)
• ​Display: 4 LED indicators + digital concentration display; supports external audible/visual alarms
• ​Communication Distance: ≤1000m (shielded cable 4×1.5mm²)
• ​Alarm Outputs:
  • Relay (dry contact, 3A @30VDC/250VAC)
  • Audible/Visual Alarm (200mA @24VDC)
• ​Operating Environment:
  • Temperature: -40℃ to 70℃
  • Humidity: ≤95% RH (non-condensing)
  • Pressure: 86–106 kPa

​VII. Wiring Instructions​

• ​V1, V2: 24V DC power input (non-polarized).
• ​L1, L2: LBUS communication lines (non-polarized).
• ​SG+, SG-: Audible/visual alarm output (0V in normal state; 24V during alarm).
• ​COM, NO: Relay contacts (COM = common, NO = normally open). Relay activates during alarm.
• ​Note:
  • V1/V2 and L1/L2 are non-polarized.
  • SG+/SG- supports up to 100mA load.
  • Ground the housing if required.

​VIII. Configuration & Operation​

​1. Operational States​

1.1 ​Power-On:

• Green power LED lights steadily. The digital display shows the detector address, followed by a 3-minute sensor warmup countdown.

1.2 ​Monitoring Mode:

• Displays real-time gas concentration after warmup.

1.3 ​Alarm Mode:

• Red LEDs light for low/high alarms. Relays and audible/visual alarms activate.

1.4 ​Fault Mode:

• Yellow LED lights for faults:
  • ​ERR1: Sensor fault (replace sensor or contact manufacturer).
  • ​ERR2: Gas concentration exceeds range (recalibrate after confirming safety).
  • ​ERR3: Audible/visual output short circuit (check wiring).

​2. Calibration & Settings​

Use infrared remote ​HK-8205​ to enter password ​8888.

• ​CO Zero Calibration: Perform in clean air for 10 minutes.
• ​C1 Calibration: Apply 50% LEL standard gas (500ml/min flow). Adjust displayed value to match gas concentration.
• ​A1/A2: Set low/high alarm thresholds (default: 25% and 50% LEL).
• ​Addr: Assign unique LBUS address for network communication.
• ​rF: Configure relay activation for low/high alarms.
• ​d: Select gas type (001=Methane, 002=Hydrogen, 003=Propane, 004=Isobutane).

​IX. Maintenance​

1. Calibrate annually (biannually in harsh environments). Use certified service providers.
2. Keep sensors clean and unobstructed. Avoid exposure to moisture, direct gas jets, or physical impacts.
3. Do not disassemble beyond authorized repairs.

​X. Troubleshooting​

​XI. Warranty​

• Free repair/replacement within 2 years of purchase. Exclusions:
  1. Damage from misuse, improper installation, or unauthorized modifications.
  2. Force majeure, transportation accidents, or physical impacts.

​Shanghai Huikong Electronic Technology Co., Ltd.​​
Address: Hunan Highway, Xinchang Town, Pudong New Area, Shanghai
Tel: 021-6901087 Fax: 021-33275717 Website: http://www.shhkdz.com
Version: 20041114