It is designed for use in any processes where cyclone or filter type arrestment plant are used, eg bag, ceramic and cartridge filters. The system comprises up to 16 networked sensors, a central control unit, user interface with data acquisition and optional PC software.
The DA660 uses Electrodynamic technology, an advanced rod electrification method. The DC signal created by particles colliding with a probe inserted in a stack duct is electronically filtered out, leaving a conditioned AC signal resulting from charged particles passing and interacting with the rod.
Since the signal includes no DC component, the instrument has minimal cross sensitivity to changing velocity* and has increased stability even with dust build-up on the sensor rod.
The dust signal is amplified, digitised and processed at the sensor, consistent with good signal to noise design techniques. The processed signal is proportional to dust concentration although the exact correlation is application dependent.
A patented Electrodynamic insulated probe option is also available to minimise false signals resulting from dust build-up at the base of the sensor which can occur in humid drying processes and conductive dust applications.
Unlike other insulated sensors, this sensor operates with unique AC signal analysis which provides measurement stability, velocity insensitivity and tolerance to dust coating on the sensing part of the rod. (patent protected)
Why use the DA660
The DA660 sensor has sufficient resolution and signal to noise characteristics to provide a good indication of dust emissions in mg/m3 and to reliably monitor the performance of fabric filter dust collection equipment for applications requiring high accuracy.
The DA660 can be configured to display either:
1) Indication of dust level in mg/m3 using the results from an Isokinetic sample or
2) Emissions relative to a 'normal' level (for applications only needing to monitor changes in emissions)
3) Bagfilter leakage and broken bags as well as suspect bag location in bag row/chamber
For installations with multiple bagfilters on similar processes it is useful to use a uniform scaling factor on all sensors so that dust levels can be compared between emission points.
The DA660 uses a 12 bit microprocessor which has sufficient processing power to provide resolution of 0.1mg/m3 and dynamic ranging (important when tracking dust pulses in bagcleaning systems) of 5,000:1