1、 Introduction to Toxic and Harmful Gas Detection Transmitters

The BYG500-XX series fixed toxic and harmful gas detection transmitter can detect the percentage concentration (% LEL) of flammable gases within the lower explosive limit in the air; Oxygen content within the volume percentage (Vol%) concentration and toxic and harmful gas detection range (unit: parts per million ppm) concentration are converted into 4-20mA standard signal output in a proportional relationship. Processed and displayed through the BYG500-XX series gas detection alarm host produced by our company. When the concentration of the detected gas in the air reaches or exceeds the alarm set value (when the oxygen deficiency is lower than the alarm set value), the transmitter driver connected to the host will emit an audible and visual alarm signal, reminding relevant personnel to take preventive measures in a timely manner to avoid explosions and malignant accidents.

This series of gas detection transmitters are explosion-proof instruments with an explosion-proof rating of ExdIICT6.

The combustible gas transmitter adopts a low-power thermal catalytic element sensor; The oxygen transmitter adopts an electrochemical primary battery sensor. Toxic and harmful gas transmitters all use imported electrochemical sensors. This series of products has the characteristics of high detection sensitivity, reliable technical performance, and long service life. It is an ideal product to replace similar foreign safety instruments. At present, large and medium-sized enterprises widely adopt computer distributed control systems (DCS systems), and the 4-20mA standard signal output by the transmitter can be directly connected to the monitoring system.

This series of transmitters is widely used in factories, warehouses, research institutes, petrochemical, chemical industries, rubber, leather, mining, metallurgy, environmental protection, fire protection, municipal and other departments, as well as other places with toxic and harmful gases, oxygen deficiency, and flammable and explosive materials. It is an essential instrument to prevent toxic and harmful gases from endangering personal safety, prevent explosion accidents, and achieve safe production.

2、 Characteristics of toxic and harmful gas detection transmitters

1. Stable and reliable communication, wide range power supply DC12-24V;

2. Adopting various imported sensors with a minimum lifespan of 2-3 years or more;

3. Using high-speed and high-precision processing circuits to process sensor signals, with fast response speed, high measurement accuracy, good stability and repeatability;

4. The instrument comes with a backlit large screen display, which intuitively shows various parameters such as gas concentration, type, and unit;

5. The independent design of the gas chamber, combined with aerodynamics, enables faster and more accurate detection of target gases;

6. Full range temperature digital automatic tracking compensation ensures measurement accuracy;

7. Software calibration with button settings, simple and user-friendly operation;

8. Equipped with data recovery function, there is no need to worry about misoperation;

9 RS485、 The three wire 4-20mA output, relay output, and optional sound and light alarm fully realize the digitization and intelligence of the three wire gas transmitter;

10. The three explosion-proof buttons enable the transmitter to be freely configured on site, such as viewing, setting, and calibration;

11. Design of intrinsically safe circuits and explosion-proof enclosures, ensuring safe, convenient, and fast on-site maintenance;

12. The entire shell can rotate 360 degrees according to installation requirements.

3、 Technical parameters of toxic and harmful gas detection transmitter

Technical Parameter	BYG500-XX series
Detect gas	Toxic and harmful gases, flammable and explosive gases, oxygen TVOC、CO2
Detection Principle	Electrochemical, catalytic combustion, infrared, thermal conductivity, PID photoionization, etc., depending on gas, range, on-site environment, and user requirements.
measuring range	According to the parameters (refer to the table below), the range can be customized
resolution	0.1/0.01/0.001ppm
accuracy	≤± 3% F.S (higher precision can be customized)
Sensor lifespan	Electrochemistry takes 2-3 years, oxygen takes 2 years, infrared principle takes 5-10 years, catalytic combustion takes 3 years, and thermal conductivity takes 5 years.
Warm-up time	<3 minutes
sampling interval	3S
Response time (T90)	＜60S
Nonlinear	±2%
repeatability	±2%
Supply Voltage	DC 24V(12～30VDC)， The standard for a single device is a stable power supply of 24V, 1A, or greater than 1A
signal output	Three wire system 4-20mA, RS485 Modbus RTU (wireless network transmission methods such as GPRS, RF, WIFI can be customized according to customer needs)
Alarm method	A set of relay outputs（ 2A@30V ）Sound and light alarm (optional)
Display mode	Real time display on a 1.7-inch high-definition LCD screen, optional on-site display without display, or optional remote display, control, and alarm of gas alarm host
Installation method	Wall mounted, pipeline type (working pressure is atmospheric pressure ± 30%, pressure reduction is required if exceeding the pressure range), pump suction type
Shell material	Aluminum alloy explosion-proof shell
Explosion proof grade	ExdII CT6
protection grade	IP65
work environment	-20～50℃； 0-95% RH (no condensation)
Environment	-40～60℃； 0-100% RH (no condensation)
Weight/Size	1.5kg/ 125mm×106mm×153mm
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