Overview
The Dwyer RMA-3-SSV is a compact, direct-reading variable area flowmeter from Dwyer’s Rate-Master® line, designed for precise air and gas flow measurement in pneumatic applications. Key benefit: no external power required, no calibration needed. The unit features ±4% full-scale accuracy, a clear 2″ polycarbonate scale, and stainless steel metering valve for smooth flow adjustment. With a 100 PSI maximum pressure rating and 1/8″ NPT connections, the RMA-3-SSV is ideal for cabinet purging, pneumatic testing, medical equipment, and laboratory gas control.
Key Features
- Direct-Reading Scale: Easy to read design eliminates troublesome conversions.
- Flow Stabilization: Special integral flow guides stabilize the float throughout the range to keep it from hunting or wandering in the bore.
- Durable Construction: All Rate-Master® flowmeter bodies are injection molded of tough, clear, shatter-proof polycarbonate plastic around a precision tapered pin.
- Stainless Steel Valve (SSV): Precision metering valves of brass or stainless steel permit precise flow adjustments.
- Low Maintenance: To release the plastic flowmeter body from the stainless steel backbone, just remove four screws, allowing easy cleaning.
Technical Specifications
- Flow Range: 0.2–2 SCFH air (0.09438–0.9438 LPM, 94.38–943.8 CCM)
- Pressure Rating: 100 psi (6.9 bar)
- Temperature Limit: 130 °F
- Accuracy: 4% of full scale
- Scale Length: 2 inches
- Process Connection: 1/8″ female NPT
- Weight: 4 oz
- Body Material: Polycarbonate
- O-Ring Material: Neoprene & Buna-N
- Float Options: Stainless steel, black glass, aluminum, K Monel, tungsten carbide
- Valve Material: Stainless steel
Typical Applications
This flowmeter is commonly used for measuring air flow in medical equipment, air samplers, gas analyzers, pollution monitors, chemical injectors, and cabinet purging equipment. Additional uses include:
- Pneumatic test benches and pilot pressure lines
- Laboratory gas flow monitoring
- Industrial pneumatic system commissioning
- Low-flow air and inert gas measurement
Compatibility & Replacements
Compatible With
- Compressed air systems (clean, dry air)
- Inert gases and compatible liquid media
- 1/8″ NPT threaded pneumatic manifolds and tubing
- Pneumatic control circuits up to 100 PSI
- Panel or surface mounting installations
Replaces / Drop-In Replacement For
The RMA-3-SSV directly replaces other Dwyer RMA-3 models with equivalent flow ranges. Verify exact model compatibility with your original unit before ordering. Common superseded variants include RMA-3-BV (brass valve) configurations.
Works With
- All standard pneumatic control systems
- Dwyer Rate-Master® ancillary metering valves
- ISO 1/8″ NPT adapter fittings
- Laboratory and industrial gas distribution networks
