一. Background

The traditional firefighting is to call the police after a fire occurs, and then take corresponding measures to eliminate the fire. This is an after-the-fact mechanism, and many times the fire develops quickly and does not ultimately bring the fire under control.

 

In recent years, when the Internet of Things is booming, with the help of Internet of Things technology, smart fire protection has been mentioned again, and each company has a different definition of smart fire protection. Our company's definition of smart fire protection is to detect the occurrence of fire in advance, and eliminate the fire when it occurs.

 

二．Method to realize

2.1  Signs before fire breakout

• temperature rise
• produce a pungent odor
• produces slight smoke

2.2  Implementation method

For the signs of fire before the fire, our company uses a variety of sensing technologies combined with wireless transmission and cloud platform for detection and transmission processing. When there are signs, we will call the police in advance. Control the fire in its bud. The main sensors are as follows:

• detect particulate matter
• Detection of odor concentration
• Detection temperature
• Infrared thermopile rapid temperature rise alarm

The wireless transmission is divided into two parts, using LORA locally to transfer the sensor data to the gateway, and the gateway uploads the alarm data to the cloud through 2G/3G/4G/5G. Its functional block diagram is as follows:

The platform adopts the B/S system architecture. The platform is divided into three layers. The first layer is the data acquisition layer. The equipment in this area collects and transmits data through communication interfaces and protocols, and stores the data of the monitoring equipment in the TCP server and video resources. Stored in cloud server. The second layer is the data transmission layer. The data of the pollution monitoring equipment is wirelessly communicated through the GPRS/3G/4G network, and the video transmission is transmitted through the wireless traffic card or the wired network. The third layer is the data display layer. Through the platform monitoring software, it provides a graphical presentation effect and graphically displays the operating data of the system. In addition to the display, it also provides fault information collection, fault reproduction, live video online live broadcast, and equipment management. linkage, governance work plan arrangement, big data analysis of security trends, etc.
 

三. Cloud Platform

The cloud platform is mainly divided into three modules: cockpit, alarm center, and data center.

3.1 Cockpit

The cockpit mainly contains the alarm list, equipment geographical distribution and status, and equipment statistics. If an alarm occurs on the device, the map will display the alarm status

Alarm Center

The alarm center can configure alarm push methods, including APP, SMS, voice, email, and WeChat push methods. Once the concentration exceeds the set threshold, the platform can notify the alarm contact in time.

 

Data Center

You can view historical concentrations, historical alarms

 

3.2 Wireless Transfer

Facing this kind of large-scale sensor data transfer, Hengyi's long-distance wireless transmission technology is used to transfer the data of various sensors to the building management platform. Hengyi's wireless technology uses a combination of LORA, 2G/3G/4G/5G/CAT1 (mobile network), and Ethernet. Use LORA locally to transmit sensor data to the gateway, which in turn transmits the data to the platform via a mobile network or Ethernet. Wireless transmission has gateway, LORA communication module group, wired signal to LORA. The three products and their period parameters are described below:

• Wireless Transfer Gateway

The wireless gateway supports LORA wireless, RS485 locally, which is used to collect local sensor data and upload it to the management platform, cloud platform, or alarm host.

 

Parameters		Description
Master	Master	Industrial grade CPU, main frequency 540MHZ
	DDR	64M Byte, the highest frequency supports up to 360MHz
	FLASH	32M Byte
Wireless	LORA	430~434MHZ, others can be customized 913~918MHz
	WIFI	2.4GHZ, support IEEE802.11b/g/n
	2G/3G/4G	FDD-LTE/TDD-LTE/DC-HSPA+/HSPA+/HSPA/WCDMA/TD-SCDMA/GSM/GPRS/EDGE
Hardware Parameters	Data interface	1 Ethernet port, 1 2/3/4G, 1 RS485
	Supply voltage	DC 6V~14V input; can be customized DC6-36V
	Working environment	Working temperature -10℃~75℃, humidity 0%~90%RH
	Current consumption	Working current: <200mA/12V, maximum current 500mA/12V
Software Agreement	Operating System	LINUX 3.4
	Internet Protocol	IP,TCP,UDP,HTTP,HTTPS
	Wireless Protocol	LORA, WIFI protocol, ad hoc network LORA protocol
	RS485	MOBUS, a custom 485 communication protocol

 

• Lora Communication Module

There are many independent fire-fighting sensors in the traditional fire-fighting field. When such sensors detect dangerous signals, they will independently issue alarm signals.

 

  

Project	Parameters
Frequency	433MHZ
I/O input	High 2.7V, Low 0.3
I/O output	High 2.7V, Low 0.3
Wireless Protocol	LORA
Maximum transmit power	20 dBm
Maximum transmit power current	150mA@3.3V
Deep Sleep Current	2uA@3.3V

 

• Cable Signal To LORA

There are many traditional fire sensors without wireless interface, and the external interface is RS485 or I/O. For this scenario, our company has developed a converter that converts the wired alarm signal output by the traditional fire sensor into a wireless alarm signal, as follows As shown in the figure:

Parameter name		Parameter value
Product model		HYC7L32
Hardware Interface	Wireless mode	LoRa
	Wired mode	RS485/RS232
	Enter IO	1 input
	Output IO	1 channel switch output
	Button	1
	USB	1 TypeC interface, which can be powered and upgraded
	Indicators	6
LoRa Parameters	LoRa Frequency	150MHz ~ 960MHz, different frequency ranges for different models
	RX Sensitivity	-140dBm
	TX Power	Max +21dBm
Electrical Parameters	Power supply	Power adapter/USB
	Power	DC8-32V/1A, USB
	Size	85.7*100*96(L*W*H, including LoRa antenna)
	Working current	12V power supply, 100MA (standby 20MA, 100MA when transmitting wireless data)
	Operating temperature	-20℃ ~ +85℃
	Working humidity	10 ~ 95% (non-condensing)

 

3.3 Terminal Sensor

Terminal sensor is a very important part in the field of smart fire protection, and it is also the core part. The future development direction of smart fire protection, research and development of new sensors in the field of fire protection. Our company has developed several new sensors for the field of fire protection. At the same time, we have also made some improvements to some traditional sensors in the field of fire protection, so that they can be easily adapted to some fields of smart fire protection. The following sensors are some of our products for smart fire protection :

• Fire Warning Sensor

The fire warning sensor is different from the smoke detector. The smoke detector only alarms when there is thick smoke in the fire. The fire warning sensor will alarm for the increase of peculiar smell and the increase of particulate matter before the fire breaks out. The following is the introduction of this product.

 

Sensor Type	Measurement resolution	Measuring range	Measurement accuracy
TVOC	1ug/m3	0ug/m3~999ug/m3	±10%
PM2.5	1ug/m3	0ug/m3~999ug/m3	±10%
PM10	1ug/m3	0ug/m3~1000ug/m3	±10%

 

Project	Parameters	Notes
Operating voltage	12V
Working current	<350MA
Warm up time	5 minutes
Operating temperature	0℃~50℃
Working humidity	15%RH-80%RH (no condensation)
Lifetime	5 years (in the air)
Communication method	LORA	RS485, CAT1 can be customized
Size	φ120mm*42mm (diameter*height)
Weight	150mg
Installation method	Ceiling installation

 

The infrared thermopile alarm uses a multi-point infrared sensor, and the alarm sensing part is aimed at the measured object, and the temperature of the measured object can be measured in real time. The detection distance range of the sensor is 0CM~200CM. This sensor is mainly aimed at some special products that are prone to fire.

Parameters	Description
Temperature Matrix	H90 is 32X32, 110 and 050 are 32X24
The principle of temperature measurement	Thermopile temperature measurement
Temperature angle	H90 is 33˚
Temperature range	50℃~300℃ (other temperatures should be calibrated and calibrated)
Effective detection distance	0CM~200CM
Operating temperature	-20℃~60℃
Detection speed	0.5 seconds
External interface	RJ45, RS485 and I/O output two options
Temperature error	In the light spot, the error of 80CM is 0.3℃
Power	8V~28V

• Infrared Single Point Temperature Rise Alarm (Under Development)
• Wireless Smoke

Independent photoelectric smoke and fire detection alarm, using special high-performance ultra-low power consumption intelligent microprocessor and precision photoelectric sensor to independently process and collect smoke concentration, extremely low power consumption, stable and reliable performance, beautiful and durable, easy to use, using wireless LORA , CAT1 forwards the alarm information to the cloud platform.

Here are the pictures and parameters of this product:

Project	Parameters
Power supply	One 3V CR17335 lithium battery
Alarm sound level	80dB
Alarm current	95mA
Standby Current	<2uA
Operating temperature	-10℃~50℃
Working relative humidity	<90%RH(No condensation)
Normal monitoring indicator light	Blink once every 340 seconds
Execution standards	GB201517-2006
Communication method	LORA ,CAT1
Alarm mode	Sound and light alarm, wireless alarm signal output
Product size	80*80*51MM

 

四．Application Field

4.1 Lithium battery finished product warehouse and semi-finished product warehouse

Lithium batteries heat up before they catch fire, producing a pungent odor, and fumes wafting downward. In response to these strong situations, the front-end uses particulate matter sensors and infrared surface array temperature rise alarms to detect whether there is an abnormal situation in front, and if there is an abnormal situation at the front-end, the alarm signal is uploaded to the cloud platform for alarm through wireless.

4.2Flammable Chemicals Inventory

n recent years, explosions in hazardous chemical warehouses have occurred frequently. Once a fire and explosion accident occurs in a hazardous chemical warehouse, the resulting disaster will cause immeasurable losses to people's lives and property. Before the fire and explosion in the hazardous chemical warehouse, most of them were sick, the temperature increased, and the particles were abnormal.

 Using our temperature sensor, the particle sensor can upload the changes of the environment to the cloud platform for alarm。