Dwyer DTFA - Manual

Series DTFA Variable-Area Flowmeter for Gases
Specifications - Installation and Operating Instructions
Bulletin F-DTFA
DWYER INSTRUMENTS, INC.
Phone: 219/879-8000 www.dwyer-inst.com
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A. Fax: 219/872-9057 e-mail: [email protected]
SPECIFICATIONS
Service: Compatible gases.
Wetted Materials:
Body: Aluminum;
Spring: 302 SS;
Range spring: 302 SS;
Magnet: PTFE-coated;
Metering cone: Acetal;
Seals: Buna.
Temperature Limits: -40 to 200°F (-40 to 93°C).
Pressure Limit: 3000 psig (200 bar).
Accuracy: ±5% FS.
Repeatability: ±1% FS.
Size: Diameter dial face 2.5˝ (63.5 mm).
Process Connections: See model chart.
Weight: DTFA-1A: 3 lb (1.36 kg); DTFA-2A: 5 lb (2.27 kg).
The Series DTFA Variable-Area Flowmeter for Gases measures gas
rates with ±5% of full-scale accuracy at an affordable price. Rugged
aluminum construction ensures great compatibility and the strength to
withstand system pressures of up to 3000 psig (200 bar). With a wide
variety of flow ranges available, the Series DTFA can be used with many
different applications all at an economical price.
Calibration
All Series DTFA Variable-Area Flowmeters for Gases are calibrated at
the factory for mounting in the horizontal position and should be installed
that way for maximum accuracy.
The unit will normally retain its accuracy tolerance for the useful life of
the device. If you want to check the accuracy, do so only with
instruments of certified accuracy. Do not attempt to check accuracy with
other flowmeters piped in series. Even minor variations in piping and
back pressure can cause significant differences in indication. If in doubt,
return the flowmeter to the factory for a calibration check.
1/2˝ NPT PROCESS CONNECTION
5-47/64
[145.54]
Ø2-59/64
[74.17]
1/2˝ NPT
INLET & OUTLET
1/4˝ NPT CONNECTION
3-19/32
[91.44]
1
[25.40]
3
[76.20]
11/16
[17.53]
1/4˝ NPT
INLET & OUTLET
3/4
[19.05]
2
[50.80]
Ø2-59/64
[74.17]
Connection
1/4˝ NPT
1/4˝ NPT
1/4˝ NPT
1/4˝ NPT
1/2˝ NPT
1/2˝ NPT
1/2˝ NPT
1/2˝ NPT
1/2˝ NPT
Model
DTFA-1A-10A
DTFA-1A-15A
DTFA-1A-20A
DTFA-1A-25A
DTFA-2A-30A
DTFA-2A-40A
DTFA-2A-50A
DTFA-2A-75A
DTFA-2A-100A
Range, SCFM
1.5 to 10
2.0 to 15
3.0 to 20
3.0 to 25
3.0 to 30
4.0 to 40
4.0 to 50
5.0 to 75
10.0 to 100