Fields of application
The dust concentration measuring device PFM 97 W is used for the continuous measurement of dust contents, especially for the emission measurement according to TI air, 13th, 17th and 27th BImSchV as well as for the dust concentration measurement in process monitorings. Parallel to the dust measurement flow and temperature of the smoke gas are registered.

Function principle
The special probe of the PFM 97 consists of 2 tribo probes and a dynamic pressure probe: The tribo probes register redundantly the raw signal of the dust concentration. In order to correct the velocity influence at the triboelectric measurement the gas velocity is measured by means of a dynamic pressure probe. The synchronous determination of the gas temperature allows the calculation of the dust concentration in norm state.

Technical data

Control unit: weather-proof aluminium case, dimensions 305 x 240 x 300 mm (W x H x D), 3 kg, IP 65
Probe: GRP weather protection hood, dimensions 300 x 400 x 1000 mm (W x H x D), ca. 10 kg
Measuring principle: dust: redundant measurement with 2 triboelectric probes; flow: differential pressure; temperature: Pt 100
Measuring ranges: temperature: 0 ... 300 °C, velocity: 0 ... 30 m/s flow: 0 ... 1.000.000 m³/h, dust i.O.: 0 ... 15 (max. 500) mg/m³, dust i.n.: 0 ... 15/45/150/500 mg/m³
Calibration: by gravimetric dust measurements
Display: 4-lines LCD-Display
Media temperature: max. 280 °C (higher temperatures on request)
Ambient temperature: -20 ... +50 °C
Dew point difference: min. +5 K
Flow velocity: from appr. 3 m/s
Analogue signals: 5 x 4 ... 20 mA, (including 2 x dust, temperature, flow) , galvanically isolated
Digital signals: 6 potential-free contacts (failure, maintenance, limit value 1 and 2 / maintenance request, measuring range)
Power supply: 110 VAC, 230 VAC or 24 VDC
TÜV-Approval: TI air, 13th, 17th and 27th BImSchV