AirSafe - 连续环境粉尘含量监测

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AirSafe -
连续监测环境中的粉尘含量

连续监测控制系统、料仓、锅炉房、工作区域环境中的粉尘含量

  • 可避免粉尘防爆条件的形成
  • 安全监测工作环境中的粉尘含量
  • 从系统中逃逸出来的粉尘较大可能能被监测到
  • AirSafe可以应用于对粉尘较为敏感的工作环境下的粉尘含量监测
  • 可应用于22

Use

Triboelectric sensor technology from SWR has proven itself in thousands of applications for measuring dust concentrations in process systems. 
AirSafe is a new measuring instrument which can monitor the dust concentration in ambient air, for example in control system areas, silo areas, boiler houses or work stations.
AirSafe monitors concentrations on the basis of pre-set limit values.
For example, to avoid the accumulation of dust in explosion zones or to detect unnoticed accumulation of dust from processes.
AirSafe can be used as early detection for dust which could endanger the workplace.

Function

AirSafe consists of a flow duct and an integral triboelectric dust sensor.
A current of air is drawn through the duct at approximately 100 m3/h.
Dust particles, carried in the air current, passes the sensor, this generates a charge transfer, which is used as the measurement signal.
This signal is converted to electrical process outputs which could be used for display or control.

System
The AirSafe flow duct is 500 mm long and 100 x 100 mm square.
The integral dust sensor has a relay output which energises when the set limit value is exceeded.
The unit is supplied pre-calibrated.
The alert point is set to approximately 25 mg/m³ of dust.
The user can set his own alarm threshold.
This may be set within a range of approximately 5 mg/m³ to 150 mg/m³.
The alert point can be changed in steps of 5 mg by simply pressing a button.
As well as a contact closure output, the sensor also has an RS 485 output which can be connected to a wall mount or DIN rail mount transmitter.
The output from the transmitter is a standard 4 . . . 20 mA process output.
The transmitter also has a ModBus RTU RS 485 output which can also be used for connection to a PC.
By using the visualisation software, up to 10 measuring points can be displayed and saved and can be interfaced to other computer programs, e. g. Excel.

Mounting and Installation

AirSafe can be installed anywhere in a room.
Except of high ambient temperatures, there is no need to maintain distances from units or walls.

AirSafe can be wall-mounted using brackets provided.

Technical Data

Sensor Measured objects Solid particles in a gas stream
  Particle size 0.3 µm or larger
  Measurement range From 0.1 mg/m<sup>3</sup>
  Ambient temperature - 20 . . . + 60 °C
  Humidity 95 % RH (non condensing)
  Measurement principle Triboelectric
  Damping time 1 s
  Output signals Relay output, either NC or NO
  Dimensions 500 x 100 x 240 (L x W x H)
  Housing material Aluminium
  Protection type IP 65
  Power supply 24 ± 10 % V DC
  Rating Max. 10 W
  Electrical connection Screw terminals
  Weight 5.5 kg
     
Transmitter (DIN rail) Power supply 24 ± 10 % V DC
  Power consumption 20 W / 24 VA
  Protection type IP 40 to EN 60 529
  Ambient operating temperature -10 … +45 °C
  Dimensions 23 x 90 x 118 (W x H x D)
  Weight Approx. 172 g
  Connection terminals conductor cross-section 0.2 - 2.5 mm<sup>2</sup> [AWG 24-14]
  Current output signal 4 … 20 mA (0 … 20 mA), load < 500 Ω
  Switch output - measurement alarm Relay with switchover contact, max. 250 V AC, 1 A
  Interface ModBus (RS 485)
  Data backup Flash memory
     
     

Application Example

Click on a desired application example to navigate to a detailed description.

Dust monitoring at spray dryer

Emergency shutdown with AirSafe

Plant protection,
dust monitoring
with AirSafe

 
 

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