4-in-1 Gas Detection System (CO/H₂S/O₂/LEL) with Built-in Vacuum Pump and 4-20mA/RS485/Relay Outputs
A powerful pump-suction fixed gas detector that monitors up to 6 gases simultaneously, including the standard 4-in-1: CO (0–1000ppm, 1ppm), H₂S (0–100ppm, 0.1ppm), O₂ (0–30%VOL, 0.1%VOL), and LEL (0–100%LEL, 1%LEL). Features a built-in long-life vacuum pump (>12,000 hours) for fast response and remote sampling – detect gas hazards in high or confined spaces from a safe location. With 2.4″ HD color display, infrared remote control (no need to open the enclosure), 3-wire 4-20mA, RS485 Modbus, and relay outputs. IECEx/ATEX certified Ex d IIC T6 Gb, IP65 rated. Optional integrated or external sound/light alarm.
Product Overview
The YT-98H series is a fixed single and multi-gas detector designed for continuous, simultaneous monitoring of up to 6 gases. Taking the standard 4-in-1 combination (CO, H₂S, O₂, LEL) as an example, it uses electrochemical sensors for CO, H₂S, and O₂, and a catalytic combustion sensor for LEL.
Built-in High-Performance Vacuum Pump
Unlike traditional diffusion detectors that rely on ambient air reaching the sensor, the YT-98H features a built-in long-life vacuum pump with a continuous operating life of >12,000 hours. This pump actively draws air from the sampling point to the detector, providing:
- Faster response time (T90 ≤ 20 seconds)
- Remote sampling capability – Install the detector in a normal open area while sampling air from high elevations, underground confined spaces, tanks, or ductwork
- Effective personnel protection – Maintenance workers can monitor hazardous gas levels from a safe distance before and during entry
2.4″ HD Color Display & User Interface
The 2.4-inch industrial-grade high-definition color screen (320×240 resolution) features:
- 120-degree wide viewing angle
- Simulation menu icons for intuitive navigation
- Chinese and English switchable interface
- Comprehensive display: gas molecular formula, concentration value, unit, pump status, and alarm status
- Maximum (MAX) and minimum (MIN) value display
- Switchable gas units (ppm, mg/m³, %VOL, %LEL)
Non-Intrusive Configuration
The detector supports infrared remote control as standard – adjust settings, perform zero/span calibration, and modify alarm thresholds without opening the enclosure. This is critical for maintaining explosion-proof integrity in hazardous areas. An optional non-contact magnetic wand is also available.
Multiple Output Signals
The YT-98H is compatible with most control systems (PLC, DCS, SCADA) through:
| Output Type |
Standard / Optional |
| 3-wire 4-20mA analog |
✅ Standard |
| RS485 Modbus |
✅ Standard |
| Relay (1 set) |
✅ Standard (controls external devices like fans, horns, alarm lights) |
| Relay (2 sets) |
✅ Optional (expandable) |
| HART |
✅ Optional |
| 0–10V / 0–5V / 1–5V |
✅ Optional |
Important: The external sound/light alarm can be connected without occupying the relay – separate dedicated terminals are available.
Why Monitor These Four Gases?
| Gas |
Hazard |
Common Sources |
Exposure Limit |
| CO |
Toxic (binds to hemoglobin) |
Incomplete combustion, engines, furnaces, blast furnaces |
50 ppm (OSHA PEL) |
| H₂S |
Toxic, flammable |
Sewers, digesters, oil/gas wells, refineries |
10 ppm (OSHA ceiling) |
| O₂ |
Deficiency or enrichment |
Confined spaces, inert gas purging, oxygen lines |
19.5% (deficiency), 23.5% (enrichment) |
| LEL |
Explosive |
Methane, propane, natural gas, gasoline vapors |
10% LEL (alarm typical) |
Product Pictures
Key Technical Specifications (for 4-in-1: CO/H₂S/O₂/LEL)
| Parameter |
Value |
| Gases Detected |
CO, H₂S, O₂, LEL (up to 6 gases total – additional gases selectable) |
| Detection Principles |
Electrochemical (CO/H₂S/O₂), Catalytic combustion (LEL) |
| Resolution |
CO 1PPM, H2S 0.1PPM, O2 0.1%VOL, LEL 1%LEL |
| Accuracy |
≤ ±2% FS (depending on specific sensor) |
| Response Time (T90) |
≤20 seconds (depending on specific sensor) |
| Repeatability |
≤ ±1% |
| Pump Flow Rate |
0.5 L/min |
| Pump Operating Life |
>12,000 hours continuous |
| Zero Shift |
≤ ±1% (FS/year) |
| Display |
2.4-inch color LCD, 320×240 resolution |
| Display Content |
Gas formula, concentration, unit, pump status, alarm status |
| Language |
Chinese, English (others customizable) |
| Alarm |
Optional sound/light alarm (integrated or external); user-adjustable high/low set points |
| Fault Alarm |
Sensor disconnect alarm |
| Output Signals |
3-wire 4-20mA, RS485 Modbus, 1 relay (standard); optional 2nd relay, HART, 0–10V, 0–5V, 1–5V |
| Control Methods |
Infrared remote control (standard); magnetic wand (optional) |
| Communication & Data Download |
Optional PC software for history data download, storage, printing, analysis |
| Operating Temperature |
-10°C to +55°C |
| Operating Humidity |
0–95% RH (non-condensing) |
| Case Material |
Die-cast aluminum |
| Power Supply |
12–24V DC |
| Dimensions (H×W×D) |
286 × 202 × 96 mm |
| Weight |
3.4 kg (3.8 kg with alarm light) |
| Explosion-Proof Grade |
Ex d IIC T6 Gb |
| Protection Grade |
IP65 |
Main Features
- Actively draws sample air from remote, high, or confined spaces
- Install detector in safe open area while monitoring hazardous locations
- Faster response than diffusion sampling
- Protects maintenance personnel by enabling pre-entry gas checks
2.4″ HD Color Display
- 320×240 resolution, 120° wide viewing angle
- Simulation menu icons for easy navigation
- Switchable Chinese/English interface
- Displays MAX, MIN, and real-time values
- Switchable gas units (ppm, mg/m³, %VOL, %LEL)
Up to 6 Gases Simultaneously
- Standard 4-in-1 (CO/H₂S/O₂/LEL) plus optional toxic gases (NH₃, Cl₂, SO₂, NO₂, VOC, etc.)
- Reduces installation time and cost in multi-gas environments
Multiple Output Signals
- 3-wire 4-20mA, RS485 Modbus, 1 relay (standard)
- Optional: 2nd relay, HART, 0–10V, 0–5V, 1–5V
- External sound/light alarm connection does NOT consume relay – dedicated terminals
Non-Intrusive Configuration
- Infrared remote control (standard) – adjust settings without opening enclosure
- Optional magnetic wand for hazardous area operation
Rugged & Certified
- Ex d IIC T6 Gb flameproof explosion-proof
- IP65 waterproof and dustproof
- Explosion-proof, lightning protection, electrostatic protection, surge protection
Optional Accessories
- Sound/light alarm (integrated or external)
- Water-vapor filter cartridge
- Automatic dehumidification & drainage system (normal temperature)
- Manual dehumidification & drainage system (normal temperature)
- High-temperature flue gas pre-treatment system
Typical Applications (Detailed)
The YT-98H with built-in pump is ideal for sampling from remote, high, or confined spaces where diffusion detectors cannot reach:
- Confined Space Entry
- Install detector outside manhole/tank while sampling inside
- Pre-entry gas check for O₂ deficiency, H₂S, CO, and LEL
- Continuous monitoring during worker entry – protect from a safe distance
- Underground Utilities & Sewers
- Pump samples from below-ground vaults, lift stations, and sewer lines
- Detect H₂S (sewer gas) and methane (LEL) before entry
- Ductwork & HVAC Systems
- Install detector in mechanical room while sampling from inside air ducts
- Monitor for refrigerant leaks or combustion byproducts
- Storage Tanks & Vessels
- Sample from inside tank during cleaning or inspection
- Detect flammable vapors (LEL) and toxic gases (H₂S, CO) from residual contents
- Chimneys & Flue Gas Stacks
- With optional high-temperature pre-treatment system, sample up to 1200°C flue gas
- Monitor CO, O₂, NOx, SO₂ for combustion efficiency and emissions compliance
- Oil & Gas Refineries
- Sample from flare stacks, catalytic cracker enclosures
- Monitor H₂S in amine treatment areas, LEL in process units
- Chemical Plants
- Sample from reactor vent lines, storage tank headspaces
- Detect toxic intermediates and flammable releases
Company Introduction
Shenzhen YuanTe Technology Co., Ltd. (brand: Safegas) was established in 2010 and specializes in the R&D, manufacturing, and sales of gas detection equipment and integrated systems. With over 16 years of industry expertise, the company serves sectors including oil & gas, chemicals, environmental protection, electronics, municipal engineering, agriculture, and household appliances. Their product portfolio includes portable gas detectors, fixed gas transmitters, gas analyzers, control panels, and calibration accessories. All products are manufactured under ISO9001 and ISO45001 management systems, holding international certifications such as IECEx, ATEX, and EMC. With an annual production capacity of over 80,000 units, YuanTe Technology supplies gas detection solutions to customers worldwide.
Company Advantages
- Built-in long-life vacuum pump – >12,000 hours continuous operation; remote sampling from confined spaces
- Fast response – T90 ≤20 seconds (faster than diffusion)
- Multi-gas capability – Up to 6 gases simultaneously, reducing installation costs
- 2.4″ HD color display – Simulation menu icons, switchable Chinese/English
- Infrared remote control – No need to open enclosure for calibration/setpoint changes – safe for hazardous areas
- Multiple output options – 4-20mA, RS485, relay, HART, 0–10V, 0–5V, 1–5V
- External alarm ready – Connect sound/light alarm without consuming relay
- IECEx/ATEX certified – Ex d IIC T6 Gb for Zone 1/2 hazardous areas
- Rugged protection – IP65, explosion-proof, lightning/surge/electrostatic protection
- Flexible accessory options – Dehumidification, filtration, high-temperature sampling
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