Matheson Model 3517ANL Single Stage High Purity SS Regulator
SEQ3517ANL, CGA-540, No Lube Assembly

A CGA fitting is the standardized system for the attachment of a compressed gas cylinder to the required regulator or transfer line. The three digit number, CGA (XXX), corresponds to specific gasses which that fitting is tailored for. See CGA Connection Chart.pdf in the downloads section for specific gas types compatible with this Stainless Steel CGA-540 fitting.

Regulator Specifications

Maximum Inlet Pressure: 3000 psig (20,700 kPa)
Maximum Flow Rate: 4500 SCFH (2115 SLPM)(At 2000 psig, N2)
Flow Capacity (Cv): 0.08
Operating Temperature: -15°F to 140°F (-26°C to 60°C)
Porting (Regulator Body): 1/4” NPT Female
Porting Configuration: 3 High, 3 Low
Delivery Pressure Range: 0-500 PSIG
Delivery Pressure Gauge: Vac-0-1000 PSIG
Cylinder Pressure Gauge: 0-4000 PSIG

This is a Matheson Single Stage 316 Stainless Steel regulator with a 1/4 in compression tube outlet connection and 1/4 in FNPT body porting. It comes equipped with 2 inch inlet and delivery pressure gauges, an outlet diaphragm valve, metal to metal seals, chrome plated brass bonnet, and a Teflon seat.

This Matheson series 3510A, model 3517ANL regulator is to be used in applications requiring delivery pressures up to 500 PSIG and can accept a maximum inlet pressure of 3000 PSIG. This regulator is suitable for a variety of chromatography applications requiring the supply of carrier gas/detector support gas. This regulator is suitable for any application requiring the supply of non-corrosive gases and some applications requiring the supply of semi-corrosive gases. This no lube model is assembled without the use of PCTFE. This allows the regulator to be used in applications where method detection limits are sub-particles per million.

Gas Chromatography Detectors which can use the 3517ANL Regulator:

Electrolytic Conductivity Detector (ELCD or Hall Detector)
Electron Capture Detector (ECD)
Mass Selective Detector (MSD or MS)
Atomic Emission Detector (AED)

Single-Stage vs. Two-Stage

Both single-stage and two-stage regulators operate by reducing the pressure of gas supplied by a cylinder to an appropriate output level. The intake and delivery pressure ranges of regulators do not depend on how many stages they have, but by each regulators mechanical characteristics. When considering a single vs. a two-stage regulator there are two things to keep in mind: Droop and Supply Pressure Effect. Droop is the decrease in output pressure caused by an increase in flow rate. Supply Pressure Effect is simply the variation in delivery pressure from the cylinder to the regulator.

Single Stage regulators will experience less droop with varying flow rates but a large supply pressure effect and need to be monitored and adjusted by an operator or used in applications where supply pressure will remain constant. Two-Stage regulators inherently control for variations in supply pressure while producing a constant output and therefore can be used without an operator present and in applications which require a very specific delivery pressure. The specification sheet for this series of regulator can be found in the downloadable section as a .PDF.