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MECAIR – Filter Failure Detector

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Filter Failure Detector

The main purpose of Goyen | Mecair FFD is to detect significant increases in particulate concentration likely to be related with a broken bag in the filter or other major failures. Thanks to the 4-20 mA output it also acts as an integrated unit to deliver dependable and pragmatic filter monitoring.

The FFD utilizes a unique probe electrification technology which provides much better performances than conventional DC triboelectric systems as well as alternative AC systems. This allows extending the velocity range over which the system has no cross sensitivity to changing velocity. Thanks to that technology, the FFD is also unaffected by build-up of particulate on the sensing rod, thus eliminating signal drift concerns.

A charge signature is induced by particulates in the airstream interacting with the sensing rod. The FFD extracts a specific frequency band from the induced AC current signature and filter out the DC current generated by direct particle collisions. In order to reject signals falling outside a pre-defined frequency range, the so resulting signal is electronically filtered. Thanks to that, Goyen | Mecair filter failure detectors are less susceptible to changes in particle velocity and are not affected by any particulate contamination on the sensing rod.

Also this technology, not relying on particles colliding with the probe, is able to measure a more representative area of the stack and eliminate the need of long sensor probe rods. Thanks to the digital averaging of readings in combination with the alarm delay feature, by properly setting the delay period, the system will exclude short term signal increases associated with pulse cleaning of filters. This translates into a much lower likelihood of having false alarms.

OPERATIONAL RANGE

Suitable for a wide range of dust collectors designs and configurations
Dust level response: <1mg/m3 to 500mg/ m3 (<0.028 mg/ft3 to 14 mg/ft3)
Flue gas velocity from 4m/sec
Flue gas temperature up to 200°C (390°F)
Ambient temperature from -20°C to +50°C (-4°F to +120°F)
Duct sizes from 0.5m
Hazardous area ATEX II 3GD

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FILTER FAILURE DETECTOR

PROCESS AND APPLICATION CONDITIONS

Stack temperature rang e	–20 to 200°C (–4 to 390°F)
Stack temperature rang e	–20 to 200°C (–4 to 390°F)	2 Wiper seal	2 Wiper seal
SENSOR – KEY DATA		¾”
Flue gas velocity	4 m/s
Dust level response	<1 to 500 mg/m³ (dependent upon application)
Application conditions	Suitable for measurement in non-condensing šue gases.
ENVIRONMENTAL INFORMATION		ENVIRONMENTAL INFORMATION
Location	This equipment is for outdoor or sheltered use.
Altitude category	2,000m (6,500 ft.), max.
SENSOR SPECIFICATION
FFD SENSOR		FILTER FAILURE ALARM MONITOR
Sensor variant	Standard sensor: 0–200°C (up to 390°F)
Probe rod material	316 Stainless Steel, PTFE (insulator)
Weight	approx. 1930 g (4.3 lb)
Cable entries	2× M16 cable glands
ENCLOSURE		ENCLOSURE
Ambient temperature range B	–20 to +50°C (–4 to 120°F)
Dimensions	W 111 × H 135 x D 7 × 5.3 × 3 in.), excl. cable glands
Protection ratin	IP65
Material	Die-cast aluminium LM6M (epoxy coated)
POWER REQUIREMENTS		POWER REQUIREMENTS
Power supply voltage	16–24 V DC
Current consumption	max. 100 mA
I / O		POWER REQUIREMENTS
Local outputs	2× Alarm relays: • volt-free SPCO • current rating 1 A DC (@ 30 V) per contact • non-fail-safe operation only. 1 × 4–20 mA output: 250Ω, non-isolated.