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 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 span valve can adjust the flow range 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 control stem has a full 10 turns of resolution between zero flow and the maximum rate. When the controller is 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 |
