Model 300 – Gas Flow Controllers

Downstream-referenced fixed span flow controller

model 202 flow controller
Model 300 gas flow controller
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The Model 300 maintains a constant flow rate as long as the outlet pressure remains constant. (Most users allow the gas to be released at atmospheric pressure.) While the supply pressure might fluctuate from variations in sampling pressure or from chemical reactions taking place, the flow rate remains stable.

The Model 300 will accurately maintain the set flow rate in spite of fluctuating upstream pressure — even if the fluctuation is to within 10 psi of the supply pressure. When the flow controller is equipped with the optional Spectrol digital dial, settings are reproducible to better than 1%. The maximum flow rate available is 1.6 L/min with ambient downstream pressure.

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

Select a knob style and body material below to view product numbers.

Basic knob

Aluminum
Stainless

Screwdriver adjustable

Aluminum

Knob + 3-digit dial

Aluminum
Stainless

Knob + 4-digit dial

Aluminum
Stainless

Model 300: Aluminum body, standard control knob

Diaphragm material Flow rate
/min 		Product No.
Viton 0-200 mL FC30AV1K
0-300 mL FC30AV2K
0-800 mL FC30AV3K
0-1.6 L FC30AV4K
Stainless steel 0-200 mL FC30AS1K
0-300 mL FC30AS2K
0-800 mL FC30AS3K
0-1.6 L FC30AS4K

Model 300: Stainless body, standard control knob

Diaphragm material Flow rate
/min 		Product No.
Viton 0-200 mL FC30SV1K
0-300 mL FC30SV2K
0-800 mL FC30SV3K
0-1.6 L FC30SV4K
Stainless steel 0-200 mL FC30SS1K
0-300 mL FC30SS2K
0-800 mL FC30SS3K
0-1.6 L FC30SS4K

Model 300: Aluminum body, 3-digit dial

Diaphragm material Flow rate
/min 		Product No.
Viton 0-200 mL FC30AV1S3
0-300 mL FC30AV2S3
0-800 mL FC30AV3S3
0-1.6 L FC30AV4S3
Stainless steel 0-200 mL FC30AS1S3
0-300 mL FC30AS2S3
0-800 mL FC30AS3S3
0-1.6 L FC30AS4S3

Model 300: Stainless body, 3-digit dial

Diaphragm material Flow rate
/min 		Product No.
Viton 0-200 mL FC30SV1S3
0-300 mL FC30SV2S3
0-800 mL FC30SV3S3
0-1.6 L FC30SV4S3
Stainless steel 0-200 mL FC30SS1S3
0-300 mL FC30SS2S3
0-800 mL FC30SS3S3
0-1.6 L FC30SS4S3

Model 300: Aluminum body, 4-digit dial

Diaphragm material Flow rate
/min 		Product No.
Viton 0-200 mL FC30AV1S4
0-300 mL FC30AV2S4
0-800 mL FC30AV3S4
0-1.6 L FC30AV4S4
Stainless steel 0-200 mL FC30AS1S4
0-300 mL FC30AS2S4
0-800 mL FC30AS3S4
0-1.6 L FC30AS4S4

Model 300: Stainless body, 4-digit dial

Diaphragm material Flow rate
/min 		Product No.
Viton 0-200 mL FC30SV1S4
0-300 mL FC30SV2S4
0-800 mL FC30SV3S4
0-1.6 L FC30SV4S4
Stainless steel 0-200 mL FC30SS1S4
0-300 mL FC30SS2S4
0-800 mL FC30SS3S4
0-1.6 L FC30SS4S4

Model 300: Aluminum body, screwdriver adjustable operator

Diaphragm material Flow rate
/min 		Product No.
Viton 0-200 mL FC31AV1

MORE INFORMATION

TYPICAL APPLICATIONS

  • Sample flow control in stream sampling systems
  • Constant flow control for pneumatic gauging instrumentation
  • Control of reactant or purge gases
  • Control of gases in analysis standards

SPECIFICATIONS

Max. flow rate

1.6 L/min with ambient downstream pressure
Max. inlet pressure 200 psi
Max. temp 100°C
Standard fittings

1/8" external tube fittings (EAOR22)

ALTERNATE FITTINGS

The standard fitting is the 1/8" external to 5/16-24 O-ring seal (EAOR22).

Alternate fittings: