Dwyer DFMT2 - Manual

Series DFMT2 Digital Paddlewheel Flow Transmitter
Specifications - Installation and Operating Instructions
Bulletin F-DFMT2
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 DFMT2 Remote Digital Paddlewheel Flow Transmitter is a two
piece digital flow transmitter that provides instantaneous, as well as totalizing flow
monitoring. The two piece design allows the user to separate the control panel from
the application, making it ideal for industrial use in reverse osmosis water purifying
systems and any other applications where space is limited. The large backlit
display makes navigating through the menu structure simple. The Series DFMT2
uses high accuracy, industry proven paddlewheel technology, offers a user
selectable 4 to 20 mA or pulse output, and has a corrosion resistant PVDF sensor
giving it a long operation life. Users can reset the totalizer at any time and set a
security password protecting the system settings 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 DFMT2, 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.
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
Figure 1: Mounting Straight Pipe Runs Required
Model
DFMT2-10A
DFMT2-15A
DFMT2-20A
DFMT2-25A
DFMT2-40A
DFMT2-50A 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)
1.76 (0.8)
1.81 (0.82)
1.85 (0.84)
1.94 (0.88)
2.20 (1.0)
2.43 (1.1)
Range
(m3/h)
0.1-2
0.2-4.09
0.3-5.91
0.5-11.36
1.5-23.85
2-40.88 Male
NPT
3/8˝
1/2˝
3/4˝
1˝
1-1/2˝
2˝ Press.
(MPa)
1.0
1.0
1.0
0.8
0.8
0.8
A
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)
CABLE LENGTH 197˝ [5 m]
3-7/8 [100]
31/32
[24.61]
4-1/2
[114.30]
A
1-13/32
[35.72]
4-9/16
[115.89]
3-7/8
[100]
Remote Mounting Bracket
(Stainless Steel)