Page 1
CLEARANCE
1-15/16
GAP 14˝ PIPE AND UP
2-1/16
®
SERIES DS
IN-LINE FLOW SENSORS
FLOW
Use with the Dwyer® Differential Pressure Gages or Transmitters
Valves — Standard, brass
with TFE seat and Buna-N
O-ring.
Nameplate — Stainless
steel permanently attached
with split ring. Includes
complete size and model
information.
Head — Machined
stainless steel.
Packing gland — Brass
compression tting.
Sensor tube — 304 SS.
Sensing ports — Multiple
upstream and downstream
ports sized and positioned
to provide effective
accurate pressure
averaging, even at lower
velocities.
Series DS-300 Series DS-400
The Series DS In-Line Flow Sensors are two Series of averaging Pitot tubes for
compatible gases and liquids that provide accurate and convenient ow rate sensing,
for schedule 40 pipe, when purchased with suitable differential pressure gage with
appropriate range. The Series DS-300 Averaging Flow Sensors are designed to be
inserted in the pipeline through a compression tting and available for pipe sizes from
1 to 10˝ (2.5 to 25.4 cm). Accessories include adapters with 1/4˝ SAE 45° ared ends
In-Line
compatible with hoses supplied with the Model A-471 Portable Capsuhelic
Flow Sensors,
The Series DS-400 Averaging Flow Sensors are designed for insertion lengths up
to 24˝ (61 cm) and include a pair of 1/8˝ NPT x 1/4˝ SAE 45° ared adapters which
are compatible with hoses used in the Model A-471 Portable Capsuhelic
The supplied solid brass mounting adaptor has a 3/4˝ dia. compression tting to lock
in required insertion length and a 3/4˝ male NPT thread for mounting in a threaded
branch connection (not included).
1/16 [1.59]
®
[49.21]
1/4 NPT
®
Gage Kit.
Gage Kit.
[52.40]
1-5/8 [41.28] TYP.
1-5/8 [41.28]
1-3/4 [44.45]
1-11/16 [42.86] APPROX
1-7/16 [36.53]
5/16 [7.94]
1/16 [1.60]
GAP UP TO 12˝ PIPE
1/8 [3.175]
Large 3/4 inch diameter for extra strength in lengths to 24 inches
SPECIFICATIONS
Service: Compatible gases or liquids.
Wetted Materials: Sensor tube: 304 SS; Compression tting: brass.
Temperature Limit: 200°F (93.3°C).
Pressure Limit: 200 psig (13.78 bar) at 200°F (93.3°C).
Pipe Sizes: DS-300: 1 to 10˝ (2.5 to 25.4 cm); DS-400: 6 to 24˝ (15.2 to 61 cm).
Process Connections: DS-300: 1/4˝ male NPT compression tting included; DS-
400: 3/4˝ male NPT compression tting included.
Piping Connections: DS-300: 1/8˝ female NPT; optional 1/8˝ female NPT x 1/4˝
SAE 45 ared adaptor sold separately; DS-400: 1/8˝ female NPT with 1/8˝ female
NPT x 1/4˝ SAE 45 ared adapters include.
Weights: Consult factory.
2-1/8 [53.98]
3-5/8 [92.08] APPROX.
3/4 [19.05]
DIA.
BENEFITS/FEATURES
• Multiple sensing point measurement and built-in averaging capability eliminates
the need for “traversing” the owing stream with single point velocity pressure
measurement saving time
• Extremely reliable, proven technology, Pitot tubes, have been used in ow
measurement for years
• All models include convenient and quick-acting quarter-turn ball valves to isolate
the sensor for zeroing with 1/8˝ female NPT valve assembly process connections.
• Furnished with instrument shut-off valves on both pressure connections with 1/8˝
female NPT connections 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
• The Series DS-400 Averaging Flow Sensors are quality constructed from extra
strong 3/4˝ dia. stainless steel to resist increased forces encountered at higher ow
rates with both air and water
• Economical ow indication when used with appropriate differential pressure gage
• Rugged construction yields, non-clogging, stable design
APPLICATIONS
• Remediation
• Natural, are, ue, stack gas
• Boiler feedwater
• Cooling water
• Superheated, saturated, or geothermal steam
• Combustion or compressed air
• Oil ow monitoring
DWYER INSTRUMENTS, LLC | dwyer-inst.com262
USA: California Proposition 65
WARNING: This product can expose you to chemicals including Lead, which is known to the State
of California to cause cancer and birth defects or other reproductive harm. For more information go
to www.P65Warnings.ca.gov.
Page 2
SERIES DS
IN-LINE FLOW SENSORS
Use with the Dwyer® Differential Pressure Gages or Transmitters
FLOW
HOW TO ORDER
Merely determine the pipe size into which the ow sensor will be mounted and
designate the size as a sufx to Model DS-300. For example, a ow sensor to be
mounted in a 2˝ pipe would be a Model No. DS-300-2˝.
For non-critical water and air ow monitoring applications, the chart below can be
utilized for ordering a stock Capsuhelic
300 ow sensor. Simply locate the maximum ow rate for the media being measured
under the appropriate pipe size and read the Capsuhelic
water column to the left. The DS-300 sensor is supplied with installation and operating
instructions, Bulletin F-50. It also includes complete ow conversion information for the
three media conditions shown in the chart below. This information enables the user
to create a complete differential pressure to ow rate conversion table for the sensor
and differential pressure gage employed. Both the Dwyer
RANGE CHART
Gage Range
(in w.c.)
2
2
2
5
5
5
10
10
10
25
25
25
50
50
50
100
100
100
Media
@ 70°F
Water (GPM)
Air @ 14.7 PSIA (SCFM)
Air @ 100 PSIG (SCFM)
Water (GPM)
Air @ 14.7 PSIA (SCFM)
Air @ 100 PSIG (SCFM)
Water (GPM)
Air @ 14.7 PSIA (SCFM)
Air @ 100 PSIG (SCFM)
Water (GPM)
Air @ 14.7 PSIA (SCFM)
Air @ 100 PSIG (SCFM)
Water (GPM)
Air @ 14.7 PSIA (SCFM)
Air @ 100 PSIG (SCFM)
Water (GPM)
Air @ 14.7 PSIA (SCFM)
Air @ 100 PSIG (SCFM)
®
differential pressure gage for use with the DS-
®
gage range in inches of
®
Capsuhelic® gage and ow
Full Range Flows by Pipe Size (Approximate)
1˝ 1-1/4˝ 1-1/2˝ 2˝ 2-1/2˝ 3˝ 4˝ 6˝ 8˝ 10˝
4.8
8.3
11.5
20.5
30
19.0
50.0
7.7
30.0
83.0
11.0
41.0
120.0
18.0
63.0
185.0
25.0
90.0
260.0
36.5
135.0
370.0
33.0
90.5
14.0
51.0
142.0
19.0
72.0
205.0
32.0
112.0
325.0
44.0
161.0
460.0
62.0
230.0
660.0
42.0
120.0
18.0
66.0
190.0
25.5
93.0
275.0
40.5
155.0
430.0
57.5
205.0
620.0
82.0
300.0
870.0
65.0
210.0
34.0
118.0
340.0
45.5
163.0
470.0
72.0
255.0
760.0
100.0
360.0
1050.0
142.0
505.0
1500.0
113
325
47
178
610
67
250
740
108
390
1200
152
560
1700
220
800
2300
49
183
510
78
289
820
110
410
1100
173
640
1800
247
900
2600
350
1290
3600
sensor feature excellent repeatability so, once the desired ow rate is determined,
deviation from that ow in quantitative measure can be easily determined. You may
wish to order the adjustable signal ag option for the Capsuhelic
easily identied reference point for the proper ow.
Capsuhelic
ow units are available on special order for more critical applications. Customer
supplied data for the full-scale ow (quantity and units) is required along with
the differential pressure reading at that full ow gure. Prior to ordering a special
Capsuhelic
Bulletin F-50 to obtain complete data on converting ow 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.
86
330
920
138
510
1600
195
725
2000
310
1130
3300
435
1600
4600
620
2290
6500
®
gages with special ranges and/or direct reading scales in appropriate
®
differential pressure gage for ow read-out, we recommend you request
205
350
1340
3600
560
2150
5700
800
3040
8100
1250
4860
13000
1800
6400
18500
560
2130
6000
890
3400
10000
1260
4860
15000
2000
7700
22000
760
2050
320
1200
3300
450
1690
4600
720
2630
7200
1000
3700
10000
1500
5000
15000
®
gage to provide an
Flow Sensors,
In-Line
MODEL CHART
Model Description Model Description
DS-300-1˝
DS-300-1-1/4˝
DS-300-1-1/2˝
DS-300-2˝
DS-300-2-1/2˝
DS-300-3˝
DS-300-4˝
DS-300-6˝
DS-300-8˝
DS-300-10˝
OPTIONS
To order add sufx: Description
-LV DS-300 or DS-400 less valves
1˝ pipe size
1-1/4˝ pipe size
1-1/2˝ pipe size
2˝ pipe size
2-1/2˝ pipe size
3˝ pipe size
4˝ pipe size
6˝ pipe size
8˝ pipe size
10˝ pipe size
DS-400-6˝
DS-400-8˝
DS-400-10˝
DS-400-12˝
DS-400-14˝
DS-400-16˝
DS-400-18˝
DS-400-20˝
DS-400-24˝
6˝ pipe size
8˝ pipe size
10˝ pipe size
12˝ pipe size
14˝ pipe size
16˝ pipe size
18˝ pipe size
20˝ pipe size
24˝ pipe size
-LV option
ACCESSORIES
Model Description
A-161 Brass bushing, 1/4˝ x 3/8˝
USA: California Proposition 65
WARNING: This product can expose you to chemicals including Lead, which is known to the State
of California to cause cancer and birth defects or other reproductive harm. For more information go
to www.P65Warnings.ca.gov.
uSee page 31 (Series 4000)
DWYER INSTRUMENTS, LLC | dwyer-inst.com
263
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