Specifically designed for detection of early-stage fire risk in storage silos for coal and biomass fuels, Silowatch continuously monitors and quickly responds to sudden carbon monoxide (CO) build-up, allowing preventative action to be taken before a fire develops.

Silowatch provides fast, accurate monitoring of CO in the silo, using AMETEK Land’s unique dual-sensor detection system. The detection of sudden CO build-up enables operators to act quickly, protecting your personnel, securing expensive silo equipment and avoiding costly downtime.

Silowatch works by extracting the sample gas from the silo headspace and continuously monitoring the CO level. Automatic calibration ensures high measurement integrity, while alarms can be customised to individual silo conditions.

Designed specific for use in coal and biomass storage silos, Silowatch ensures the protection of people, plant and process.

Silowatch has been proven in dozens of applications worldwide, providing enhanced safety and continuous monitoring. The detector’s extractive dual sensor system allows very high stability and automatic detection of calibration drift. As an additional precaution, an optional oxygen measurement is available for monitoring oxygen-limited silos.

The detector’s dual sensors constantly check CO levels at the silo headspace, using extractive analysis. The sensor’s fast response - T90 typically < 50 seconds - to increased CO levels provides the earliest possible warning to the operator of worsening conditions.

An optional Z-purge allows the Silowatch analyzer to be installed in Class II Div 2 hazardous areas.

Silowatch is AMETEK Land’s carbon monoxide detector for detection of spontaneous heating and spontaneous combustion in biomass and coal silos.

  • Advanced system warning of potential fire.
  • Protect expensive silo equipment and prevent downtime
  • Specifically designed for fire detection on coal mills/silos - Robust low maintenance system
  • Continuous self-checking of measurement integrity - High level of reading confidence
  • Tailored to each application - standard analog and discreet contact outputs
  • Optional Oxygen measurement for Silo fire detection applications

  • Protect expensive silo equipment and prevent downtime
  • Robust , low maintenance system
  • High level of reading confidence
  • Tailored to each application
  • Easy connection to plant control equipment to alarm n the event of a suspected fire

Advance warning of the onset of coal mill and silo fires through the build-up of carbon monoxide

This unique detection system, is specifically designed to detect rapid build-up of carbon monoxide inside silos storing coal and biomass. It continuously monitors the atmosphere inside the silo, and responds very quickly to any significant increase in the levels of CO, created by early-stage combustion which could lead to a fire. This provides the operator with advance warning to enable preventative action to be taken before damage to the plant, or injury to personnel occurs.

Why Carbon Monoxide (CO)?

The close monitoring of CO, as opposed to temperature sensing, provides much earlier detection of combustion and subsequent prevention of a mill fire. The CO system will detect changes significantly faster - in time to prevent damage.

How it works?

The Silowatch Detector extracts sample gases from the silo headspace and continuously monitors the levels of carbon monoxide (CO). Dual sensors continuously monitor CO, with self-checking and autocalibration to maintain integrity.


Alarm threshold levels can be set to best suit the plant operating conditions. These settings can also compensate for externally introduced CO, where mills are using recycled combustion air for coal feed heating.

Optional Oxygen Measurement

Measurement of oxygen is an option in the single stream measurement instrument. Oxygen-limited silos will benefit from the additional measurement as an additional fire prevention precaution. Similarly, plants using re-cycled flue gas can continuously monitor oxygen levels.

Measurement Range

  • CO Measurement Ranges : 0-100 up to 2000 ppm in 50 ppm steps
  • Resolution : 1 ppm / 1 mg/m3
  • Optional O2 Ranges : 0 - 5 % to 0 - 25 %


  • Calibration Method : Automatic 2-point calibration span and zero

User Interface

  • Type : LCD with backlight 4 x 20 character, 8 access keys


  • Analog Output : 4 to 20 mA isolated current loop for each CO & O2 measurement
  • Relay Outputs : 2 x Level Alarms; System OK; Calibration/Maintenance
  • Relating Rating : Isolated changeover (Type C) 1 A @ 240 V a.c. or 5 A @ 240 V d.c.


  • System Enclosure : Painted steel, sealed IP65 / NEMA 4
  • Ambient Temperature :
    • 0 to 45 °C / 32 to 113 °F standard;
    • to -20 °C / -4 °F with optional case heater;
    • to 50 °C / 122 °F with optional vortex cooler


  • EMC : Conforms to EN-50 081 & EN-50 082
  • Electrical Safety : Conforms to EN-61010-2


  • Power Supply : 100 - 120 V a.c. or 190 to 240 V a.c., 50-60 Hz, 300 VA

Gas and Air Requirements

  • Instrument Air (cooling) : 5 - 10 bar / 70 - 150 psi clean and dry, 300 l/min/10.5 cfm
  • Calibration Gas :
    • 100 ppm to 500 ppm CO, balance N2 recommended
    • 2 bar / 30 psi
    • 20 litres (0.7 cu.ft.) per calibration approx.


  • Size (H x W x D) : 600 x 600 x 350 mm / 24 x 24 x 14 in.
  • Weight : 53 kg . 117 lb.
  • Options :
    • Twin Stream CO
    • System Sample Probe and Lines
    • Heating / Cooling
    • Z-purge for hazardous area operation
    • Oxygen measurement (Single Stream only)

  • Coal Bunkers and Silos

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