Boiler Draft Measurement
What Is Draft : Draft means a difference in pressure or differential pressure. The word draft is usually used for very low-pressure differentials up to 1000 mmwc. It is measured with the help of a transducer that converts this small differential pressure to a small electrical signal. This signal, in turn, is amplified to standard values like 4 – 20 mA, 0 – 5.0 Volts, etc., and then used for display as well as control. Applications of Draft Measurement and control: In two main applications draft measurement and control is essential. 1. HVAC Applications 2. Boiler Applications Here we are talking about Boiler applications. Measuring and controlling the furnace draft is important for two reasons. To increase combustion efficiency To maintain safe operating conditions. Uncontrolled draft causes poor, non-efficient operation of a furnace (poor combustion efficiency), unstable pilot flame, build-ups of highly toxic gases like carbon monoxide, soot accumulation due to varying air-fuel