Differential pressure flowmeter
October 2012
Flow Measurement & Control
The Durag D-FL 100 flow monitor continuously determines flow velocity and flow rate in exhaust gas. The flow is calculated from the differential pressure in a flow probe with two measuring chambers. The flow in the duct builds up a pressure difference between the two separate chambers of the probe and this pressure differential is proportional to the square of the gas speed. To calculate a normalised flow, input for differential pressure, absolute pressure and temperature is used. The flow monitor measures across the cross-section of the duct.
Alarm levels are pre-selectable and any alarms are indicated inertia free, permitting the necessary interventions on the plant control system so as to comply with prescribed emission limit values. The D-FL-100 units are available in two types: the D-FL-100-I is designed for measuring flow without temperature and pressure compensation while the D-FL-100-II measures flow with temperature and pressure compensation.
The flow volume can be converted from operational to standard conditions by the D-FL-100-10 microprocessor evaluation unit, which has been provided with two additional 0–20 mA current inputs for a temperature probe and a pressure probe. If an emission evaluation computer is available, the evaluation unit is not required. Special designs are available for use in aggressive exhaust gases. A hastelloy flow probe is recommended for power, chemical and paper plants. For operating temperatures over 600°C, an inconel flow probe is available.
The measuring ranges offered are 400–2000 mm, 2000–4000 mm and >4000 mm. Exhaust gas temperature can be up to 320°C above the exhaust gas dew point. An automatic backflow purging feature is available as an option.
For more information contact Mike Andrews, OEN Enterprises, 27 (0)11 675 4447, [email protected], www.oenenterprises.co.za
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