Rate-Master® Flowmeters- Series RM
The Dwyer Rate-Master line of direct reading precision flowmeters incorporates many unique user features at moderate cost. These low cost flowmeters are ideal for general use.
Easy to read design - The direct reading scales eliminate troublesome conversions. The scales are brushed aluminum, coated with epoxy and the graduations are on both sides of the indicating tube. Special integral flow guides stabilize the float throughout the range to keep it from hunting or wandering in the bore. The float is highly visible against a white background.
Construction assures accuracy - All Rate-Master flowmeter bodies are injection molded of tough, clear, shatter-proof polycarbonate plastic around a precision tapered pin. Critical internal diameter of the variable orifice tube is held within ±0.0004" The result is accurate and repeatable readings. The single piece plastic body is mounted to a stainless steel backbone into which pipe thread inserts are welded to absorb piping torque. Precision metering valves of brass or stainless steel (specify BV or SSV on order) are available as an optional extra and permit precise flow adjustments. For vacuum applications, Model RMA units are available with top mounted valves (specify TMV). The small Series RMA models are accurate within ±4% of full scale reading; Series RMB within + 3%; large Series RMC within ±2%.
Installation is simple - The Rate-Master can be neatly through-panel mounted to keep flow tube centers in the same plane as the panel surface or surface mounted on the panel by means of tapped holes in the backbone. When through-panel mounted, the bezel automatically positions the instrument at the correct depth in the panel cutout. Surface mounted units can also be held in place by the piping. All mounting hardware plus installation and operating instructions are included.
Cleaning is easy - To release the plastic flowmeter body from the stainless steel backbone, just remove four screws. Pipe thread flow connections remain undisturbed. Remove the slide cover and the plug ball stop, clean the flow tube with soap and water and reassemble. It's that simple.
Easy-to-interchange bodies - Within a given Series, Rate-Master flowmeter bodies can be instantly interchanged. Simply "un-plug" the body from backbone and replace it with another. "O" rings provide a tight seal on inlet and outlet. Piping remains undisturbed. Interchangeability is useful where different scale ranges are sometimes required at the same location in the laboratory or plant.
Top Mounted Metering Valves - Same precision construction for vacuum applications.,
Adjustable pointer flags - Red-lined pointer flags provide quick visual reference to a required flow level. Of clear plastic, they snap into place inside bezel and slide to desired level.
- Select model desired by letter designation. RMA, RMB, or RMC.
- Specify range desired by adding the order number after a dash following the letter designation. Example RMA-6.
- If additional features are required, and available, add the option designation to the basic model code - e.g.: BV for Brass Valve, SSV for Stainless Steel Valve, and TMV for Top Mounted Valve. For example, RMA-6-SSV is the 2" scale flowmeter range No. 6 with a stainless steel valve.
- Add accessories as desired.
| Meter Body, Bezel and Tube | Polycarbonate | |
| Wetted Metal Parts | Stainless Steel (except for optional brass valves | |
| Floats | Stainless Steel, Black Glass, Alum., K Monel, Tung, Carbide | |
| Float Stops | Polycarbonate | |
| Pipe Connections | Model RMA: ¹/8" Model RMB: ¼" Model RMC: ½" |
|
| "O" Rings | Neoprene and Buna-N | |
| Fittings | Stainless Steel brazed to Stainless Steel backbone plate | |
| Rivets | Stainless Steel, set into slots | |
| Scale | Brushed Aluminum-Clear Epoy Coated | |
| Knobs | ABS Plastic | |
| Maximum Pressure Rating | Model RMA: 100 psi Model RMB: 70 psi Model RMC: 35psi |
|
| Maximum Temperatre Rating | 130°F. | |
| Accuracy | Model RMA: 4% of full scale Model RMB: 3% of full scale Model RMC: 2% of full scale |
|
| Options and Accessories | Code | |
|---|---|---|
| Metering Valve | Brass | BV |
| Stainless Steel | SSV | |
| Top Mounted Valve | Stainless Steel - available only on RMA for air (vacuum applications) | TMV |
| Pointer Flag | Polycarbonate | PF |
| Model RMA-2" Scale | Model RMB-5" Scale | Model RMC-10" Scale | |||
|---|---|---|---|---|---|
| Range SCFH Air |
Ordering Number |
Range SCFH Air |
Ordering Number |
Range SCFH Air |
Ordering Number |
| .05-.5 .1-1 .2-2 .5-5 1-10 2-20 5-50 10-100 15-150 20-200 |
1 2 3 4 5 6 7 8 9 10 |
.5-5 1-10 2-20 5-50 10-100 20-200 40-400 50-500 60-600 |
49 50 51 52 53 54 55 56 57 |
5-50 10-100 20-200 40-400 60-600 100-1000 120-1200 180-1800 |
121 122 123 |
| Model RMA-2" Scale | Model RMB-5" Scale | Model RMC-10" Scale | |||
| Range CC Air min. |
Ordering Number |
Range Gal. Water per hour |
Ordering Number |
Range SCFM Air |
Ordering Number |
| 5-50 10-100 30-240 50-500 100-1000 200-25000 |
151* 150* 11 12 13 14 |
1-12 1-20 4-40 10-100 |
82 83 84 85 |
1-10 2-20 3-30 |
121 122 123 |
| Model RMA-2" Scale | Model RMC-10" Scale | ||||
| Range LPM Air |
Ordering Number |
Range Gal. Water per hour |
Ordering Number |
||
| .5-5 1-10 2-25 5-50 5-70 10-100 |
26 21 22 23 24 25 |
2-20 8-90 |
134 135 |
||
| Model RMA-2" Scale | Model RMC-10" Scale | ||||
| Range CC Water/min. |
Ordering Number |
Range Gal. Water per minute |
Ordering Number |
||
| 5-50 10-110 20-300 |
32 33 34 |
.1-1 .2-2.2 .4-4 .8-7 1.2-10 |
141 142 143 144 145 |
||
| Model RMA-2" Scale | |||||
| Range Gal. Water/min. |
Ordering Number |
||||
| 1-11 2-24 4-34 5-50 |
42 43 44 45 |
||||
*Accuracy ±8%