Dwyer DFMT - Manual

Series DFMT Digital Paddlewheel Flowmeter
Specifications - Installation and Operating Instructions
Bulletin F-DFMT
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 clean liquids.
Range: See model chart.
Wetted Materials:
Sensor and Impeller: PVDF;
Shaft: Ceramic;
O-Rings: Fluoroelastomer.
Accuracy: ±1.5% FS.
Repeatability: ±0.5% FS.
Output:
Analog: 4 to 20 mA (750 Ω max. loop resistance);
Pulse: NPN square wave output; Frequency: 0 to 2 kHz (adjustable);
Pulse width: 0 to 1000 ms (adjustable).
Electrical Connections: Removable screw terminal.
Temperature Limits:
Process: -4 to 194°F (-20 to 90°C);
Ambient: -4 to 149°F(-20 to 65°C).
Pressure Limit: 145 psi (1.0 MPa).
Power Requirements: 12 to 24 VDC.
Power Consumption: 2 W.
Display: 2.38 x 1.25˝ (60.33 x 31.75 mm) LCD.
Totalizing Display Maximum: 9,999,999,999.
Process Connection: See model chart.
Enclosure Rating: IP65.
Enclosure Material: ABS plastic.
Weight: See model chart.
The Series DFMT Digital Paddlewheel Flow Transmitter provides
instantaneous, as well as totalizing flow monitoring, making it ideal for commercial
and industrial systems. The large backlit LCD display makes navigating through
the menu structure simple. The Series DFMT uses high accuracy paddlewheel
technology, offers a user selectable 4 to 20 mA or pulse output, and has a corrosion
resistant PVDF sensor giving it long life. Users can reset the totalizer at any time
and set a security password protecting the setting from unauthorized changes.
Installation Instructions
The accuracy of these flowmeters can be affected by disturbances such as pumps,
elbows, tees, and valves that are in the flow stream. To reduce the error caused by
these disturbances, pick a section of pipe that is at a distance from any pumps,
bends or valves. The recommended distance away from elbows and pumps is
shown in Figure 1.
Mounting Location
To reduce the possibility of causing damage to the Series DFMT, it is
recommended that the meter be mounted in a full flow pipe. Vertical mounting is
acceptable, provided the liquid is flowing up through the meter, or a sufficient back
pressure exists on the downward flow. On horizontal mountings, it is recommended
that the meter be mounted perpendicular to the pipe. For systems that may have
small air pockets at the top of the pipe, the meter can be mounted up to 45° off the
vertical normal.
3-7/8˝
[100]
3-7/8˝
[100]
3-5/8
[93]
B
2-3/4
[68]
A
15xI.D. 5xI.D. 20xI.D. 5xI.D.
90°elbow
2x90°elbow
division 2
plane
15xI.D. 5xI.D.
20xI.D. 5xI.D
pump/valve
40xI.D. 5xI.D. 25xI.D. 5xI.D.
2x90°elbow
flange reducing
A
6˝ 152 mm
6˝ 152 mm
6-1/4˝ 158 mm
6-1/4˝ 158 mm
6-5/8˝ 168 mm
7-1/4˝ 184 mm B
4-3/4˝ 121 mm
5-1/8˝ 130 mm
5-5/8˝ 142 mm
5-1/2˝ 141 mm
6-7/8˝ 175 mm
6-7/8˝ 175 mm Connection
3/8˝
1/2˝
3/4˝
1˝
1-1/2˝
2˝
Figure 1: Mounting Straight Pipe Runs Required
Model
DFMT-10A
DFMT-15A
DFMT-20A
DFMT-25A
DFMT-40A
DFMT-50A Range GPM (m 3 /h)
0.44 to 7.93 (0.1 to 1.8)
0.88 to 17.61 (0.2 to 4)
1.32 to 26.42 (0.3 to 6)
2.20 to 52.83 (0.5 to 12)
6.61 to 105.67 (1.5 to 24)
8.81 to 176.11 (2 to 40)
Connection
3/8˝ NPT
1/2˝ NPT
3/4˝ NPT
1˝ NPT
1-1/2˝ NPT
2˝ NPT Weight lb (kg)
1.06 (0.48)
1.10 (0.50)
1.15 (0.52)
1.23 (0.56)
1.46 (0.66)
1.68 (0.76)