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Your position:Home> ProductsKQ500N Gas Alarm System


KQ500N gas alarm system consists of KQ500N gas alarm controller and gas detector. This system can connect many detectors to detect different kinds of gases and monitor the gases in the distance.

KQ500N gas alarm system applies to petroleum prospecting, oil and gas transmission, refinery, metallurgy, power plant, chemical industry, oil depot, liquefied gas station, mines, tunnels, and underground pipeline.

KQ500N gas alarm controller adopts 240 * 128 dot matrix liquid crystal display, each screen can display 4 channel data, or every screen displays all the data.
Alarm Controller collects 4-20 mA or 485 signal from detector, and transfers the signal into digital signal. After internal SCM data processing, LCD screen shows corresponding gas concentration and output control signals.

KQ500N gas alarm controller uses large capacity data storage chip with real-time data record, alarm data record, fault data record and other functions that helps users to manage data from each channel.
The controller has 8 groups alarm relay and two groups fault relay. Those relays can be composed freely. The controller can be directly connected to fan, solenoid valve etc..

The controller is easy to be installed. It realizes measurement, displaying, and public alarm control for 12 channel, 16 channel, 32 channel of detectors. When the concentration of detected gas reaches or exceeds the preset alarming value, controller will send out audible and visual alarm immediately to remind you take safety precautions (start exhaust, control system) to avoid explosion, fire and toxicosis.

Controller features:

l The controller uses high-grade Micro control chip with high speed and good reliability

l LCD displays time and alarm information.

l Monitoring gas concentration in the distance

l High sensitivity, rapid response

l Self-test function;testing the display, output and control functions

l large capacity data storage; automatically save real-time data, alarm data and fault data

l The high and low alarm points of each channels can be set separately

l 4-20 mA Signal Output, relay output (Optional )

l Large capacity backup battery; main power and backup power switches seamlessly (optional)

l Modular design is help for free combination and maintenance

l channel with first alarm, all alarm channels; makes sure the alarm position

l Two level's audible and visual alarm; this helps user to distinguish alarm level.

l Fault alarm and fault signal output function

l Simple operation, strong commonality; input signal is standard 4-20 mA signal or RS485 signal

l Multilevel password management is used to eliminate illegal operation to ensure the system's stability.

Technical parameters

Detecting Gas combustible gas, toxic gas, oxygen
Working Temperature - 10  ~ + 50 
Working Humidity < 90% R.H. no condensation
Working Pressure 80-120 kpa
Power Supply 220VAC±15%,50HZ
Backup Battery 12V/3.3AH2 pieces--optional
System Power Consumption the maximum power is100 w
Input Signal Two wire/three wire -------standard 4-20 mA signal
Four wire-------RS485digital signals optional
Current Output 4-16channel, two wire, standard 4-20 mA signal output (optional)
Digital Signal Output RS485 output(MODUS protocol) (optional)
Alarm Mode audible and visual alarm
Alarm Preset first level:low20%LEL; second level,high50%LEL
Alarm Volume

two level's volume, first level alarm≥90Db

second level ≥120Db  (1m away)

Alarm Point Setting arbitrary adjustable
Display Mode LCD display
Working channel Branch connection:12 or 16 channels
Bus-based connection: 1~32 channels
Data Storage Real-time data: each channel 256 records
Alarm data: each channel 256 records
Fault data: 240 records
Alarm Output (1-8 channel) passive normally open/normally closed contacts; 
rated output is10A 250V AC
Fault Output (2 channel) passive normally open/normally closed contacts; 
rated output is 10A 250vAC
Fix Mode wall-mounted
Transmission Distance 1000m < 2mm2 copper wire
Protection Class IP44
Weight 12kg(with backup battery)
Appearance Size 435mm×310mm×130mm

KQ500 series Fixed gas detector (also called gas sensor or gas transmitter). It can detect various gases such as flammable gas, O2、H2S、CO、HCN、NO2、SO2、NH3、HCL、CL2、H2 etc.  works 365 days. 

KQ500D/ KQ500T: fixed gas detector is also called gas sensor. Work 24 hous a day. LED display, 4~20mA  or RS485 output. detector's sensor replaceable.