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EC sensors depend upon ambient conditions for proper diffusion into
sensor. Extreme high or low sample flow
rates
(or pressure) can change diffusion rate.
Emission-grade analyzers will control flow rate through internal precision valves
and/or orifice plates and can be monitored with on-board flow rate
measurement
Calibration routines are performed through calibration flow devices venting to
atmosphere (assures ambient conditions)
Flow Control and Monitoring