Back Scattered Dust Monitor

Vasthi Instruments are global leaders in manufacturing of Back Scattered Dust Monitor and have been supplying instruments to customers worldwide, Our multidisciplinary team of scientists, physicians, engineers, and regulatory consultants with decades of global experience brings you the quintessential mechanism that provides complete safety accuracy and durability.

Vasthi Instruments was formed with visionary thinking and innovative ideas resulting in innovative products and solutions. We enhance our product quality by the continuous process of research and development. We have WIDE range of models to suite various site conditions and processes.
Back-Scattered-Dust-Monitor

CATALOG

Vasthi Instruments Back Scattered Dust Monitor for Ideal monitoring opacity and smoke levels in the exhaust gas of industrial combustion or air filtration processes. Back Scattered Dust Monitor technology means that the ‘telescopic’ detector field of view is controlled to eliminate stray scattering from the far inside stack wall. The back scattered dust monitor is conveniently mounted on one side of the stack and usually requires no light absorber or beam dump on the opposite side of the stack. The optical parts include laser source,power control, photoelectric sensor and scattered light receiving. The 650nm laser beam sent by the laser at a tiny angle into the emission source,where it acts with the dust particles to produce scattered light. The back scattered light will be processed in the sensor into electrical signals. The circuit part will realize the photoelectric conversion,laser beam modulation, signal amplification,demodulation,light source power control, V/I conversion and HMI display. Calibrator is used to generate stable optical signals to zeroing and span calibration of the device. The Back Scattered Dust Monitor design has been implementing the thinking of “no tool” on-side installation, to minimize the complexity of field installation.

Ideal For monitoring opacity and smoke levels in the exhaust gas of industrial combustion or air filtration processes.

  • In site measurement directly in exhaust gas flow using the widely accepted light transmission technique.
  • Measurement reading as % Opacity
  • Modulated green LED source for long lifetime stability and immunity to ambient light
  • Rugged 316 stainless steel construction
  • Choice of interface options enabling easy integration
  • Free utility software for PC based setup, control, and data logging
  • Optional Operator Interface with different mounting configuration

 

 

FEATURES

  • Laser backward scattering principle can prevent the laser beam from swinging When the refractive index is uneven during the mechanical vibration at uneven temperature
  • Single-side installation without optical path alignment.
  • The on-site dispel can read the dust concentration in the field.
  • After the laser beam is modulated, the system can significantly improve its anti-interference ability.
  • The device design has been implementing the thinking of “no tool” on- side installation, to minimise the complexity of field installation.
  • (4-20) mA standard industrial current output makes the connection easy. Device overall power consumption is very low at around 3w.
  • Generally, the standard setup parameters are applicable to the flue wall with a thickness less than 400mm and a diameter greater than the device stack label size. The measuring area can be customised as required specification. Users may also adjust the area under the approval and guidance of the maintenance personnel also adjust the area under the approval and guidance of the maintenance personnel.
  • Model: VE – 022

TECHNICAL SPECIFICATIONS

Parameter

Units

Min

Max

Comment

Path Length(flange to flange)                           

m

0.5

20

Flange-to-flange separation

Measuring Range

%

0.0

100.0

User Selectable

Accuracy

%

-2

+2

 

Resolution

%

 

0.1

Display Resolution

Damping

S

1

60

Selectable

Drift with Temperature

%

-2

+2

Over any 20°C in the operating range

Operating wavelength

nm

510

540

Green LED

 

Power & Air Requirements

Voltage

Vdc

                         +24

Optional 90-260 Vac PSU available

Voltage Tolerance

%

-10

+10

 

Nominal Current Consumption

mA

 

400

 

Power Up Current Consumption

mA

 

400

 

Air Supply Volume Flow

L/min

50

200

To each air-purge body

Air supply fitting

 

 

 

1” BSP threaded aperture in each air-purge body

 Interface Options

Serial Comms

 

 

 

ModBus RTU via RS485 (OI or TRX) Internal USB(OI), external USB (RX)

Analogue Output (One)

mA

4

20

Isolated and scalable

Digital Relay Contacts (two)

A

0

3

@30Vdc (signal level and data valid)

 Physical

Ambient Operating Temperature

°C

-20

+55

Air temperature around the heads

Operating Humidity

%

 

100

Air humidity around the heads

Gas Temperature

°C

 

+600

Heat insulating gaskets included

Regulatory Compliance

 

 

 

89/336/EEC (electromagnetic radiation)

73/23/EEC(low voltage)

Materials:             -Air-purge bodies

Powder coated cast aluminium or stainless steel for demanding installations

Materials:           -OI wall mounted                                 

UL related polycarbonate enclosure; aluminium front panel with PU laminate overlay and with nylon cable glands

 

Materials               – OI Panel Mounted

Powder coated steel back-box; aluminium front panel with PU laminate overlay and with nylon cable glands

Weight

Kg

 

2.5

TX or RX head plus Aluminium Air-purge body

Weight:         – OI wall mounted                      -OI panel mounted                                                     

 

kg

 

1.3

 

 

1.3

 

Warranty

months

24

 

Return to base warranty. Extensions available