Dust and SPM Monitor | Vasthi instruments | Manufactures

Author: Vasthi Instruments

Vasthi produces top-quality dust control systems for industries worldwide. Back Scattered dust monitor for accurate measurement of opacity and smoke levels in industrial combustion or air filtration exhaust gases.

Tribo Electric Dust Monitor

The Tribo Electric Dust Monitor is a real-time, continuous, indicative dust monitor with logging and alarm capability. It consists of a single probe for installation in a silo or duct, and a control unit or logger. This type-approved measuring device with a measuring probe is for very low to medium dust concentrations. It is ideal for thick-walled or double-walled ducts because of the one-sided installation.

The Tribo Electric Dust Monitor measurement is based on the principle of Tribo-Electric charge transfer. The electrical charge carried by dust particles is captured by a highly sensitive Tribe-Electric probe, amplified, and then transmitted to the control unit. As the current generated by the charge is proportional to the concentration of particles present, an indicative signal of dust presence results.

FEATURES :
  • Dust level at which the red LED light alarm is triggered.
  • The emissions level at which the audible and visual alarm is triggered.
  • 4-20 mA continuous output
  • Optional RS232 or 485
  • Data lagging

At glance

  • One-side installation
  • For very low to medium dust concentrations
  • Automatic check of zero and reference point
  • Continuous monitoring
  • For small to medium duct diameters
  • High sensitivity
  • Quick & easy single-point installation with no moving parts
  • Low maintenance costs
  • Minimum detection limit less then mg/m3

Back Scattered Dust Monitor (SPM)

Back Scattered Dust Monitorfor Ideal Monitoring of Opacity and Smoke Levels in the Exhaust Gas of Industrial Combustion or Air Filtration Processes It is a self-developed online dust monitoring device, that uses the mainstream technology of laser backscatter measurement with imported core components. It is mainly used for continuous monitoring of various sources of emissions of particulate matter concentrations. It can be equipped with CEMS, used alone or with several others, or form a dust monitoring network with shared data acquisition and processing unit.

The backscattered 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 backscattered light will be processed by 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. A calibrator is used to generate stable optical signals for zeroing and spanning calibration of the device. The Back Scattered Dust Monitor design has been implementing the concept of "no tool" on-side installation, to minimize the complexity of field installation.

FEATURES :
  • laser backward scattering principle can prevent the laser beam from swinging When the refractive index is uneven during the mechanical vibration at an 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 minimize 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 customized as required. Users may also adjust the area under the approval and guidance of the maintenance personnel and also adjust the area under the approval and guidance of the maintenance personnel.