The Bios Definer 110 is a compact indestructible EPA Flow Transfer Standard. The Definer 110 is small and lightweight, making it at home in the field, where rough handling is the norm. It is a direct replacement to fragile, glass-style orifice calibrators. The compact, durable orifice is designed to fit directly on an air sampler with a standard 1.25 inches OD inlet tube and the pressure drop across the orifice is measured with a digital manometer. Available in two flow ranges, the Definer 110 features an uncertainty of just 1% of flow reading within its rated flow range.

Each Definer 110 is calibrated in Bios' NVLAP - accredited flow calibration laboratory and the calibration numbers m and b are printed on the transfer standard.

Flow is then derived from the equation:

Qa = m * √(ΔP * Tamb / Pamb) + b

Where
Qa = orifice inlet flow rate, L/min
ΔP = pressure drop across the orifice, inches of H2O
Tamb = orifice inlet temperature, 0K
Pamb = orifice inlet ambient pressure, Bars
m, b = Calibration constants

The Definer 110 is designed for environmental monitoring professionals needing reliable air quality measurements in the field. Backed by Bios' ISO 17025 accreditation and compatible with our Proven DryCal® Technology, the Definer 110 helps ensure compliance with environmental regulations and improves your process control.

Click the below application note for more information

• Orifice Calibration