SOLUTIONS FOR CONTINUOUS MEASUREMENT OF PARTICLE EMISSIONS FROM ABATEMENT SYSTEMS AND TROUBLESHOOTING The METD line of probes is based on the triboelectric principle. Totally static and instantaneous, it is used today in many industrial sectors where the production process makes use of filtration systems up to temperatures of 400°C and higher. With their perfected technology, these systems are now able to detect even minimum leaks, with a high sensitivity of measurement, up to 0.01mg/Nmc. To detect the amount of dust emitted in the atmosphere by a filtration system, it is necessary to install an METD probe with its control unit to obtain a proportional signal.
Installation of the triboelectric probe is a simple operation and consists of placing it in a suitable proportion inside the filter exhaust pipe and connecting it electrically to the control unit that can be installed some distance away.
The special control unit for probe management consists of:
1) a linear, well-fractioned system to regulate the sensitivity of the probe signals
2) optical or numerical references on real time dust emissions
3) a text function to check the effectiveness of the signal from the probe
4) a selection of settings to read the peak and average dust emission conditions
5) isolated outputs for the management of remote alarms
6) proportional outputs (mA - V) for the connection of monitoring systems or recorders

The proportional signal can be interpreted by a microprocessor for conversion into mg/NMC or even by a 36-channel supervision system, capable of managing other amplitudes, also with 4-20 mA signal, connected to the same filter (such as pressure differential).

After installing the dust emission monitoring system, it is possible to:

• Rapidly identify an unusual dust output from the exhaust system;
• Monitor in real time the row or section containing a damaged filtration medium;
• Save energy (compressed air), by connecting the control device ∆P that regulates sleeve washing cycles to the SUPERVISION system;
• Save maintenance on filtration sleeves due to lesser stress caused by the pneumatic cleaning system;

The subject is a delicate one and is specifically handled in the FAQs

MANICARDI TECNICA is a division of the company that installs turnkey systems for dust emission detection in filtration system.