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Model 202 - Gas Flow Controllers - Upstream-referenced adjustable span flow controller

The Model 202 maintains a constant flow rate as long as the upstream (inlet) pressure is held constant during downstream pressure fluctuations from column switching, temperature programming, sequence reversal, or backflushing - even if the fluctation is to within 7.5 psi of the supply pressure.

A user-variable span adjustment permits it to be used for a variety of flow ranges. The flow range is infinitely adjustable from a minimum flow as small as 5.0 mL/min up to a maximum flow of 1.6 L/min (N2 at 40 psi).

After the span is adjusted, the flow controller has a full 10 turns of resolution between zero flow and the maximum rate. When equipped with a Spectrol digital dial, settings are reproducible to better than 1%.

The Model 202 comes standard with 1/8" NPT female pipe threads. Adapters to go from pipe to 1/16" OD tubing are included. Other fittings are available.

NOTE: With all our flow controllers, the inlet pressure must exceed the outlet pressure by 10 psi.