Flow Control
MR3A04BVBN
Key Instruments 3000 Series 2–22 SCFH Variable Area Purgemeter
About this part
MR3A04BVBN is a Key Instruments 3000 Series molded-polycarbonate variable-area purgemeter with a direct-reading air scale. The current manufacturer catalog identifies a 2–22 SCFH range, brass fittings, an inlet valve, and Buna-N seals. The meter has 1/8-inch FNPT inlet and outlet connections, ±4% full-scale accuracy, and maximum ratings of 100 psig and 150°F (65°C). It is restricted to non-hazardous fluid service
Configurations vary. Verify the exact unit before choosing a replacement.
No archived photo available
Key Facts
Specifications
| Manufacturer brand | Key Instruments, a Brooks Instrument brand |
| Product series | 3000 Series |
| Model | MR3A04BVBN |
| Instrument type | Molded-polycarbonate variable-area purgemeter |
| Scale medium | Air |
| Flow range | 2–22 SCFH in the current exact-item catalog and data sheet; the older IDT140 Rev. 4 manual lists 1–22 SCFH for tube code 3A04 |
| Valve configuration | Inlet valve |
| Accuracy | ±4% of full scale |
| Maximum pressure | 100 psig (6.9 bar) |
| Maximum temperature | 150°F (65°C) |
| Process connections | 1/8-inch FNPT inlet and outlet |
| Body and flow tube | High-impact polycarbonate |
| Fittings | Brass |
| Seals | Buna-N |
| Permitted service | Non-hazardous fluids only |
What Does MR3A04BVBN Mean?
The manufacturer’s ordering table divides the identifier into five supported configuration fields.
| Segment | Field | Interpretation |
|---|---|---|
| MR | Base model | Molded-polycarbonate body and flow tube |
| 3A04 | Tube code | Air scale; 2–22 SCFH in the current catalog and data sheet. IDT140 Rev. 4 lists 1–22 SCFH. |
| B | Fittings | Brass |
| V | Valve | Valve; the exact-item catalog identifies it as an inlet valve |
| BN | Seals | Buna-N with brass fittings |
Range Identification for Legacy Units
Current manufacturer sources assign tube code 3A04 a 2–22 SCFH air range. The older IDT140 Rev. 4 manual and the archived listing use 1–22 SCFH. The printed scale or physical label should govern identification of an individual legacy unit.
Safety and Installation Notes
- Use only with non-hazardous fluids; do not exceed 100 psig or 150°F (65°C).
- Mount the flowmeter vertically and minimize vibration and flow variation.
- Install 1/8-27 MNPT mating fittings at no more than 60 in-lb torque.
- Install the supplied 10-32 mounting screws at no more than 5 in-lb torque.
- Read a ball float at its center or a bullet float at its groove; the exact float type is not encoded in MR3A04BVBN.
- Use clean water and a soft brush for cleaning; do not use solvents or strong bases.
Documentation Downloads
Local PDF copiesPart Photos
0 imagesHistorical archive images for identification, labels, connectors, and condition reference, not current inventory.
Historical Listings & Prices
Historical listing data, not a current offerThe typical recorded price range is $59.99 to $59.99. Based on 1 archived listing record; not a current offer, appraisal, or confirmed sale price.
View archived listing titles
- Brooks MR3A04BVBN Variable Area Flow Meter, 1-22 SCFH, Air Molded - NEW