Flow Sensors- Series DS
For use with the Dwyer Capsuhelic® differential pressure gauge to measure high flow rates of air or water in pipes
The Dwyer flow sensor is an averaging pitot tube providing accurate and convenient flow rate sensing. When purchased with a Dwyer Capsuhelic® differential pressure gage of appropriate range, the result is a flow indicating system delivered off the shelf at an economical price.
Pitot tubes have been used in flow measurement for years. Conventional pitot tubes sense velocity pressure at only one point in the flowing stream. Therefore, a series of measurements must be taken across the stream to obtain a meaningful average flow rate. The Dwyer flow sensor eliminates the need for traversing the flowing stream because of its multiple sensing points and built-in averaging capability.
Dwyer Series DS-300 flow sensors are designed to be inserted in the pipeline through a compression fitting. They are furnished with instrument shut-off valves on both pressure connections. Valves are fitted with 1/8" NPT female connections. Accessories include adapters with ¼" SAE 45° flared ends compatible with hoses supplied with the Model A-471 Portable Capsuhelic kit. Standard valves are rated at 200 psig (13.7 bar) and 200°F (93.3°C). Where valves are not required, they can be omitted at reduced cost. Series DS-300 flow sensors are available for pipe sizes from 1" to 10". If replacing a DS-200 flow sensor or using a A-160 thredolet with a DS-300, an optional ¼" X 3/8" bushing, P/N A-161 is required.
Merely determine the pipe size into which the flow sensor will be mounted and designate the size as a sufix to Model DS-300. For example, a flow sensor to be mounted in a 2" pipe would be a Model No.
| Select model with suffix which matches pipe size |
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DS-200-1 ¼" DS-200-1 ½" DS-200-2" DS-200-2 ½" DS-200-3" DS-200-4" DS-200-6" DS-200-8" DS-200-10" |
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A-160 Thredolet, 3/8" NPT, forged steel, 3000 psi A-161 Brass Bushing, ¼" x 3/8" Less Valves (DS-300) To order, add suffix -LV |
For non-critical water and air flow monitoring applications, the chart below can be utilized for ordering a stock Capsuhelic differential pressure gage for use with the DS-300 flow sensor. Simply locate the maximum flow rate for the media being measured under the appropriate pipe size and read the Capsuhelic® gage range in inches of water column to the left. The DS-300 sensor is supplies with installation and operation instructions, Bulletin F-50. It also includes complete flow conversion information for the three media conditions shown in the chart below. This information enables the user to create a complete differential pressure to flow rate conversation table for the sensor and differential pressure gage employed. Both the Dwyer Capsuhelic® gage and flow sensor feature excellent repeatability so, once the desired flow rate is determined, deviation from that flow in quantitative measure can be easily determined. You may wish to order the adjustable signal flag option for the Capsuhelic® gage to provide an easily identified reference point or the proper flow. Capsuhelic® gages with special ranges and/or direct reading scales in appropriate flow units are available on special order for more critical applications. Customer supplied data for the full scale flow (quantity and units) is required along with the differential pressure reading at that full flow figure. Prior to ordering a special Capsuhelic® differential pressure gage for flow read0out, we recommend you request Bulletin F-50 to obtain complete data on converting flow rates of various media to the sensor differential pressure output. With this bulletin and after making a few simple calculations, the exact range gage required can easily be determined.
| GAUGE RANGE (IN. W.C.) |
MEDIA @ 70°F | FULL RANGE FLOWS BY PIPE SIZE (APPROXIMATE) | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1" | 1 1/4" | 1 1/2" | 2" | 2 1/2" | 3" | 4" | 6" | 8" | 10" | ||
| 2 |
Water (GPM) Air @ 14.7 PSIA (SCFM) Air @ 100 PSIG (SCFM) |
4.8 19.0 50.0 |
8.3 33.0 90.5 |
11.5 42.0 120.0 |
20.5 65.0 210.0 |
30 113 325 |
49 183 510 |
86 330 920 |
205 760 2050 |
350 1340 3600 |
560 2130 6000 |
| 5 |
Water (GPM) Air @ 14.7 PSIA (SCFM) Air @ 100 PSIG (SCFM) |
7.7 30.0 83.0 |
14.0 51.0 142.0 |
18.0 66.0 190.0 |
34.0 118.0 340.0 |
47 178 610 |
78 289 820 |
138 510 1600 |
320 1200 3300 |
560 2150 5700 |
890 3400 10000 |
| 10 |
Water (GPM) Air @ 14.7 PSIA (SCFM) Air @ 100 PSIG (SCFM) |
11.0 41.0 120.0 |
19.0 72.0 205.0 |
25.5 93.0 275.0 |
45.5 163.0 470.0 |
67 250 740 |
110 410 1100 |
195 725 2000 |
450 1690 4600 |
800 3040 8100 |
1260 4860 15000 |
| 25 |
Water (GPM) Air @ 14.7 PSIA (SCFM) Air @ 100 PSIG (SCFM) |
18.0 63.0 185.0 |
32.0 112.0 325.0 |
40.5 155.0 430.0 |
72.0 255.0 760.0 |
108 390 1200 |
173 640 1800 |
310 1130 3300 |
720 2630 7200 |
1250 4860 13000 |
2000 7700 22000 |
| 50 |
Water (GPM) Air @ 14.7 PSIA (SCFM) Air @ 100 PSIG (SCFM) |
25.0 90.0 260.0 |
44.0 161.0 460.0 |
57.5 205.0 620.0 |
100.0 360.0 `050.0 |
152 560 1700 |
247 900 2600 |
435 1600 4600 |
1000 3700 10000 |
1800 6400 18500 |
|
| 100 |
Water (GPM) Air @ 14.7 PSIA (SCFM) Air @ 100 PSIG (SCFM) |
36.5 135.0 370.0 |
62.0 230.0 660.0 |
82.0 300.0 870.0 |
142.0 505.0 1500.0 |
220 800 2300 |
350 1290 3600 |
620 2290 6500 |
1500 5000 15000 |
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