- Model 40 - Broken Bag Detectors



The PCME DUST ALARM 40 is reliable, cost-effective instrument for the continuous monitoring of broken bags in Fabric Filter Baghouses. The instrument combines the benefits of ElectroDynamic™ Probe Electrification technology and separate control unit with a scaled 4-20mA output, dual local alarms and dual alarm relays, and a clear, simple icon-driven menu and display to deliver pragmatic and dependable broken bag monitoring. The PCME DUST ALARM 40 electronics exclude short term signal increases associated with pulse cleaning of the bagfilter by appropriate setting of the alarm delay period. As a ‘Dust Gross Filter Failure Detector’, the instrument detects significant increases in particulate loading which indicates a failure in the arrestment plant.

Using PCME’s patented ElectroDynamic™ Probe Electrification technology, the instrument extracts a specific frequency band from the induced AC current signature and filters out the DC current caused by particle collisions. The technology outperforms conventional DC triboelectric systems and alternative AC systems by extending the velocity range over which the instrument has no cross sensitivity to changing velocity, and is unaffected by contamination of the sensor rod eliminating concerns of signal drift.

  • 4-20mA output (optional) scaled to 0-100% of primary alarm level (which is user defined), for external indication of dust level relative to alarm set point
  • High quality leak response with sufficient dynamic range and time response to track emissions from single and multi-compartment pulse cleaned bagfilters
  • Dual alarms for filter failure and early warning, user-defined to instantaneous or average levels above normal, with alarm delay
  • Separate control unit for remote installation with a full-colour LCD display with icon-driven menu and effective graphical user-interface for instrument configuration and dust / alarm level status

Control Unit with full-colour, icon-driven menu and display

Instrument configuration is achieved via the advanced graphical user-interface, via simple icon-driven menus. When operational, the display provides dust / alarm level status.

Alarm Delay

Ensures that there are no false alarms from bag cleaning sequences

Two Independent Alarms

Each of the two alarms can be set independently by the user directly on the scale

Dust “Overrange” Icon

Instant notification of “overrange” to define broken and leaking bag failures

Security Setting

Settings can be locked to prevent tampering by unauthorised personnel

DSP Signal Processing

High accuracy signal providing reliable results

Field Upgradeable

Enhanced features can be added at any time without the need to return the instrument to factory

Process Conditions

The PCME DUST ALARM 40 is suitable for:

  • Stacks after bag filters, cartridge filters, cyclones
  • Flue gas velocities > 4 m/s
  • Non-condensing / dry flue gases*
  • Not suitable for electrostatic precipitators or applications with water droplets*

* For wet / condensing flue gas applications see PCME STACK 181 WS

Typical Applications

The PCME DUST ALARM 40 is used in a broad range of industries, where indicative filter failure monitoring is required after baghouses and cartridge filters, including the following types of processes:

  • Timber sawing plant
  • Chemical industry eg coating plant
  • Metals refining
  • Tobacco plant
  • Food industry e.g. packing/filling plant
  • Minerals industry e.g. brick, cement kiln


  • Measurement Capability: <1 to 500 mg/m³ (application dependent)
  • Air Purge Option
    • 1/2” Air Purge Unit, BSP
    • 1/2” Air Purge Unit, NPT
    • Air Filter and Regulator assembly for purge fitting
  • Inspection Frequency: 6 months (application dependent)
  • Stack Diameters: Up to 4m: Flue Gas Temperatures: -20 to 125°C (option:-20 to 250°C)


  • 316 stainless, 0-125°C (option to 250°C)
  • 24VDC power supplied via control unit
  • IP65 die-cast aluminium enclosure

Control Unit

  • Independent dual alarms with separate relay outputs, user configurable to instantaneous or average levels above background/normal emissions
  • Full colour display user interface, with icon-drivel menus for instrument configuration and dust/alarm status
  • IP66 die-cast aluminium enclosure
  • 80-230V AC (50/60Hz)

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