Model 202 – Gas Flow Controllers

Upstream-referenced adjustable span flow controller

model 202 flow controller
Model 202 gas flow controller
close move

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 fluctuation is to within 10 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.

Type of knob/dial Body material Diaphragm material Product No.
Standard control knob Aluminum Viton FC22AV1K
SS FC22AS1K
SS Viton FC22SV1K
SS FC22SS1K
Spectrol 3-digit dial Aluminum Viton FC22AV1S3
SS FC22AS1S3
SS Viton FC22SV1S3
SS FC22SS1S3
Spectrol 4-digit dial Aluminum Viton FC22AV1S4
SS FC22AS1S4
SS Viton FC22SV1S4
SS FC22SS1S4

MORE INFORMATION

TYPICAL APPLICATIONS

  • Control of carrier gas in temperature-programmed gas chromatographs
  • Control of hydrogen or air for hydrogen flame ionization detectors
  • Constant flow control for pneumatic gauging instrumentation
  • Control of reactant or purge gases
  • Precision flow limit control
  • Sample flow control in stream sampling systems
  • Control of gases in analysis standards

SPECIFICATIONS

Flow range

Infinitely adjustable

  • Min: 5 mL/min
  • Max: 1.6 L/min

(N2 at 40 psi)

Max. inlet
pressure
200 psi
Max. temp 100°C
Standard
fittings*
  • 1/8" NPT female pipe threads
  • Pipe adapters to 1/16" OD tubing are included

*Alternate fitting: 1/8" NPT male pipe to 1/8" Valco internal (PZA22)

TECH TIP

Which kind of controller?

  • An upstream- referenced controller maintains the flow rate as long as the upstream (inlet) pressure is held constant.
  • A downstream- referenced controller maintains a constant flow under constant downstream (outlet) pressure.