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Product Details

AS-300 Fixed Harmful Toxic Gas Detector Product Overview

The AS-300 fixed harmful toxic gas detector is a toxic and harmful gas detector that can continuously and online detect the concentration of toxic and harmful gases in the air. The instrument adopts the electrochemical principle and can output the real-time gas data monitored on site through 4-20mA signals or RS485 signals. It is a standard three-wire fixed toxic and harmful gas detection instrument with LCD on-site display and plug-and-play sensor replacement, meeting the application requirements of different industries.

AS-300 Fixed Harmful Toxic Gas Detector

Applications

The industries such as petroleum, chemical, metallurgy, environmental protection, paper-making, municipal, biochemical medicine and water treatment.

Features

●Built-in temperature compensation circuit for accurate measurement

●Designed with cover-free style, infrared remote control calibration,operation

●Cast aluminum shell, suitable for various industrial environments

●Easy to install and maintain, sensor replacement on site (plug and play)

●Multiple range options can meet requirements of customers

●Standard three-wire 4-20mA signal output or RS485 output, compatible with DCS or PLC system

● Field level-2 sound and light alarms, relay output (with the external equipment such as external exhaust connected)

Technical Parameters

Principle of detection	Electrochemistry
Gas for detection	Toxic and harmful gases (see gas list for details)
Repeatability	≤±3%
T90 reaction time	＜60s（NH3＜150s）
Polarization time：	24h
Power supply：	24VDC
Power consumption	＜2.5W
Calibration	Every 4-8 months
Reset	Every 3-6 months
User interface	Infrared remote control
Working temperature	-40°C-70°C (limit); -20°C-50°C (typical)
Operating pressure	Standard atmospheric pressure ±10%
Working humidity	0-95%RH (no condensation)
Output signa	Three-wire system 4-20mA , RS485
Display	Field LCD display
Explosion-proof class	Ex db IIC T6 Gb/Ex tb IIIC T80℃ Db
Protection grade	IP66
Standard configuration	Detector host;Audible-visual warning light;Remote control;Instructions
Accessories installation	Mounting bracket;Rain cover

Type of gas detected

Serial No.	Name	Chemical formula	Standard range	Highest range
1	Ammonia	NH3	0-100PPM	0-500PPM
2	Carbon monoxide	CO	0-1000PPM	0-2000PPM
3	Sulfur dioxide	SO2	0-20PPM	0-150PPM
4	Formaldehyde	CH2O	0-10PPM	0-500PPM
5	Ethylene oxide	ETO	0-10PPM	0-500PPM
6	Vinyl chloride	C2H3CL	0-10PPM	0-500PPM
7	Chlorine	CL2	0-10PPM	0-50PPM
8	Hydrogen sulfide	H2S	0-50PPM	0-100PPM
9	Hydrogen chloride	HCL	0-20PPM	0-200PPM
10	Hydrogen cyanide	HCN	0-20PPM	0-100PPM
11	Nitric oxide	NO	0-100PPM	0-1000PPM
12	Nitrogen dioxide	NO2	0-20PPM	0-150PPM
13	Oxygen	O2	0-25%VOL	0-30%VOL
14	Ozone	O3	0-5PPM	0-100PPM
15	Acrylonitrile	C3H3N	0-10PPM	0-100PPM
16	Ethylene	C2H4	0-10PPM	0-1500PPM
17	Chlorine dioxide	CLO2	0-2PPM	0-5PPM