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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 monitoring. 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.

STANDARD SCOPE OF DELIVERY

TECHNICAL DATA

Highly-sensitive special device consisting of probe and control unit.
In-situ-measurement in low polluted exhaust gases (e.g. hall exhaust air of wood industry).
Simple assembly:
- Control unit: wall assembly
- Probe: 1“-sleeve (DIN 2986)
Analog outputs:
- 4 ... 20 mA
Digital outputs (potential-free):
- Limit value 1    (adjustable)
- Limit value 2    (adjustable) /    Maintenance request
- Failure
- Maintenance
- Measuring range    (automatic measuring    range change-over)
Display of dust content in mg/m³ i.N.dr. possible

Control unit :	Weather-proof aluminium case, dimensions 305 x 240 x 300 mm (W x H x D), 3 kg, IP 65
Measuring principle :	Stainless-steel probe rod with pre-amplifier in the probe head, probe length 300 mm (adjustments possible), IP 65
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 :	none


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