Pulverised Fuel Sampler (PFS).

What’s the benefit?

The PFS provides a representative sample according to ISO 9931.

It is a cost efficient, portable equipment, which is easy to use and fast to install, with no comprehensive calibration or setup.

A single instrument can be used in numerous pipes to calculate the absolute and relative fuel mass-flows in each individual pipe.

The PFS enables measurements and calculations of the coal mass-flow, which allows the operator to optimise the combustion process, thus reducing emissions and fuel consumption.

The PFS collects physical samples allowing for particle size analysis used for classifier optimisation and determining general state of the mill as well as determining the fuel properties of the coal going into the boiler.

The PFS ensures a dustless insertion in the pipe when used together with the Dustless Connector (DuC) or Dustless Connector Snap Lock (DuC-SL).

What does it do?

The Pulverised Fuel Sampler (PFS) is a portable unit with manual operation for extraction of a representative physical sample from the full cross section of a fuel pipe according to the international standard ISO 9931. The PFS is primarily used to determine the fuel mass-flow in the pipe.

For optimal measurements the PFS should be used together with a M&W Dirty Air Pitot (DAP) or Dirty Air Pitot Laser (DAPL) to ensure a fully isokinetic sample.

How does it do it?

The PFS consists of a portable aluminum control box, a sampling unit, a high efficiency precipitating cyclone, a sample bottle, a reinforced compressed air hose, a power supply cable and a connecting cable for sampling lance.

The sampling lance is inserted into the fuel pipe through a Dustless Connection (DC). A multi-point rotating sampling head with 4 nozzles extracts a composite sample from 64 sampling points evenly distributed over the cross-section of a circular pipe. The sampler head position wheel is turned every 15 seconds until the sampling has taken place in all 16 positions of the sampling plan. The sampling is started from the operator panel in the control unit and a sample is extracted during a four minutes period.

The sampling gas velocity is maintained at the same level as the gas velocity in the transport pipe all through the sampling period, to ensure an isokinetic sampling.

What are the technical details?

Application: Sampling of pulverised mineral fuel

Standard: According to ISO 9931

Particle size: < 1.5 mm

Pipe dimension: 210 – 1400 mm diameter

Sample volume: Max. 400 ml

Power supply: 230 V/50Hz or as required

Air supply: Min. 6 bar clean oil-free air

Humidity: 0 – 95% humidity, non-condensing

Operating temp.: Pulverized fuel max. 100° C

Weight: Lance + Control unit 15 kg

Accessories: Dustless Connection (DuC) – Connection for measuring instruments

Dirty Air Pitot (DAP) – Gas velocity measurement


1. The PFS can be delivered with a Snap-Lock Dustless Connector (PFS-SL). This product has been developed by M&W in order to help customer to save time and provide an easy way to secure a connection between the fuel pipe and measuring instrument. The design enables insertion of the measuring instrument into the fuel pipe with internal over-pressure which reduces leakage of coal-dust and provides a gas tight sealing.

Nota Bene 1

M&W offers customers a facility for quantitative assessment of the performance following one or several types of analysis such as Variographic Characterisation or a Replication Experiment based on the customer’s own material.