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Fixed Formaldehyde Detector Online Concentration Gas Detector With Alarm

F A J Trading LLC

Product Type: Fixed Gas Detector
Detection Function: Gas Concentration Detection
Installation Methods: Wall-Mounted, Pipe Type, Circulation / Flow Type, and Pump Suction Type
Detection Methods: Diffusion Type, Circulation Type, and Suction Type Optional
Signal Output: 4–20 mA, RS485, Voltage Signal, and Relay Output
Communication Protocol: Modbus RTU for RS485
Transmission: 3-Core / 4-Core Cable, TCP/IP, GPRS, and 433 MHz Wireless Optional
Power Supply: 24V DC
Working Pressure: 90–110 kPa
Body Size: 196 × 170 × 80 mm
Net Weight: 1.5 kg
Electrical Interface: 3/4 Inch EE Thread or 1/2 Inch NPT Thread

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Description

Main Function

This gas detector is used to detect gas concentration in indoor areas, pipelines, and circulation systems. It supports different installation methods including wall-mounted installation, pipe type installation, flow/circulation installation, and pump suction installation.

Key Features

Feature	Details
Product Type	Fixed gas detector
Detection Function	Gas concentration detection
Installation Methods	Wall-mounted, pipe type, circulation / flow type, pump suction type
Detection Methods	Diffusion type, circulation type, suction type optional
Signal Output	4–20 mA, RS485, voltage signal, relay output
Communication Protocol	Modbus RTU for RS485
Cable Transmission	3-core / 4-core cable transmission
Network Transmission	TCP/IP transmission optional
GPRS Transmission	Optional built-in GPRS module
Wireless Transmission	433 MHz radio transmission optional
Power Supply	24V DC
Working Pressure	90–110 kPa
Body Size	196 × 170 × 80 mm
Net Weight	1.5 kg
Electrical Interface	3/4 inch EE thread or 1/2 inch NPT thread
Thread Size for Pipe Type	M40 × 1.5 mm

Installation Types

Installation Type	Application Conditions
Wall-Mounted Installation	Used to detect indoor gas concentration. Temperature and humidity should be within the normal range. Recommended installation height is 1 m to 1.5 m, depending on the gas type and site conditions.
Pipe Type Installation	Used to detect gas concentration inside a pipeline. Pipeline temperature, humidity, and pressure should be within the normal range. Supports pipe opening with M40 × 1.5 mm thread.
Flow / Circulation Installation	Used when gas in the pipeline is flowing. Detects gas concentration while pipeline temperature, humidity, and pressure remain within normal range.
Pump Suction Installation	Used for pipeline gas detection when the pipeline pressure is slightly negative or normal pressure. Gas is sampled through pump and hose connection.

Signal Output Details

Output Type	Details
4–20 mA Signal	Standard 16-bit precision 4–20 mA output chip, transmission distance up to 1 km
RS485 Signal	Standard Modbus RTU protocol, transmission distance up to 2 km
Voltage Signal	0–5V or 0–10V output, user-settable
Switching Signal	2 relay groups standard; third relay group optional

Transmission Options

Transmission Mode	Details
Cable Transmission	3-core / 4-core cable, long-distance transmission about 1–2 km
TCP/IP Transmission	Supports TCP/IP protocol using optical fiber or network cable; optional internal/external network real-time transmission
GPRS Transmission	Optional built-in GPRS module for real-time remote data transmission
Wireless Transmission	Optional 433 MHz radio transmission mode

Working Environment

Parameter	Specification
Working Temperature	-30°C to 50°C
Working Humidity	≤95% RH, no condensation
Working Pressure	90–110 kPa
Power Supply	24V DC

Product Structure / Parts

Part	Description
Main Detector Body	Industrial fixed gas detector housing
Sensor Module	Bottom sensor section for gas detection
Display Area	Front circular display area
Side Electrical Interface	Cable / wiring connection port
Mounting Holes	Used for wall or field installation
Pipe / Hose Connection	Used for pipeline, flow, or pump suction installation