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
Flow Control and Monitoring