Dwyer DFMT User Manual

Series DFMT Digital Paddlewheel Flowmeter

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. 5 xI .D

pump/valve

40xI. D. 5xI.D .25xI. D. 5xI.D .

2x90° elbow

flange

reducing

Specifications - Installation and Operating Instructions

Bulletin F-DFMT

he Series DFMT Digital Paddlewheel Flow Transmitter provides

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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

esistant PVDF sensor giving it long life. Users can reset the totalizer at any time

r

nd set a security password protecting the setting from unauthorized changes.

a

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.

Figure 1: Mounting Straight Pipe Runs Required

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.

onnection

C

/8˝

3

/2˝

1
3/4˝
1˝
1-1/2˝
2˝

SPECIFICATIONS

ervice: Compatible clean liquids.

S

ange: See model chart.

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etted Materials:

W

Sensor and Impeller: PVDF;
Shaft: Ceramic;
O-Rings: Fluoroelastomer.

Accuracy: ±1.5% FS.

epeatability: ±0.5% FS.

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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.

Model
DFMT-10A
DFMT-15A
DFMT-20A
DFMT-25A
DFMT-40A
DFMT-50A

Range GPM (m3/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)

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)

A

˝ 152 mm

6

˝ 152 mm

6
6-1/4˝ 158 mm
6-1/4˝ 158 mm
6-5/8˝ 168 mm
7-1/4˝ 184 mm

Connection

3/8˝ NPT
1/2˝ NPT
3/4˝ NPT
1˝ NPT
1-1/2˝ NPT
2˝ NPT

B

-3/4˝ 121 mm

4

-1/8˝ 130 mm

5
5-5/8˝ 142 mm
5-1/2˝ 141 mm
6-7/8˝ 175 mm
6-7/8˝ 175 mm

DWYER INSTRUMENTS, INC.

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A. Fax: [phone] e-mail: [e-mail]

Phone: [phone] www.dwyer-inst.com

LECTRICAL CONNECTIONS

E

tem

abel

I

L

to 20 mA+

1

4

to 20 mA-

2

4

3

0 to 2 kHz+

4

0 to 2 kHz-

5

RS DATA+

S DATA-

6

1
2
3
4
5
6

7

0

1

8

11

9

1
1
7

8

9

0

1

R

2 to 24 V+

1

2 to 24 V-

1
Vo+

SIN+

IN-

S

unction

F

to 20 Output

4

Frequency/
Pulse Output
RS485

ommunication

C

nput Power

I

erminals

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Power to
Sensor (Blue)
Communication to

ensor (Red)

S

ommunication to

C

ensor (Black)

S

4 to 20 mA Output

The Series DFMT can provide a variable current output that is proportional to the
detected flow rate. This output can be used in a range of external interface devices,

nd can be calibrated to suit a particular flow range. The maximum load resistance is

a

50 Ω, including the cables used to connect.

7

Pulse (Frequency) Output

The Series DFMT offers a frequency pulsed output that can be configured as a linear
flow proportional frequency output or a standard pulsed output via the unit software.
The maximum pulse output frequency is 5 kHz with a pulse amplitude of 24V and a

aximum load current of 0.2A. The pulse output frequency is adjustable from 100-

m
5000 Hz (please refer to “To Change The Maximum Frequency” under “Pulse Output
Setup”).

When utilizing the unit with a linear proportional frequency output, the liter/pulse
option must be set to 0.0 (please refer to “To Change the Pulse/Liters” under the
“Pulse Output Setup”) and the frequency output signal scaled to the desired range
within the units capability (please refer to “To Set Qmax” under the “System Setup
Menu” to scale frequency output signal).

When utilizing the unit as a standard pulsed output (please refer to “Pulse Output
Setup” under the “System Setup Menu”).

RS485 Communication Output (Optional)

The Series DFMT features optional RS485 Communication. This must be specified at
time of order and will not function otherwise. The RS data communication option will
remain visible in the unit’s software and on the terminal board but will not be
functional. Please contact factory for RS485 communication output capable units.

USING THE SERIES DFMT

When first turned on, the Series DFMT will initialize, and then it will turn to the
measurement reading screen.

The top number is the instantaneous flow reading, followed by the total amount of
liquid passed. The bottom bar shows the percentage of flow in relation to the
maximum flow rate.

To access the menu, press the key on the keypad. Navigate through the menu
using the and to select a sub menu, and the key to enter a sub menu. To
return to the measurement reading screen, or to return from a sub menu, press the

key.

nit Adjustment

U

he Series DFMT can display flow units of L/s, L/min, L/h, m

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al/s, US gal/min, and US gal/h. The totalization units can be displayed in L, m

g

S gallons.

U

3

/

s, m

3

min, m

/

3

h, US

/

3

and

,

To change flow units:

Steps

Operation Instructions

1

From the menu, select
“Basic”.

elect “PV Units”.

2

S

3

Use and to change
the desired flow units.

ress to select units.

4

P

ress to confirm the

5

P
change, or press to
cancel the change.

o change totalization units:

T

teps

peration Instructions

S

O

rom the menu, select

1

F

Basic”.

“

2

Select “Total Units”.

se and to change

3

U

he desired flow units.

t

4

Press to select units.

5

Press to confirm the
change, or press to
cancel the change.

Display

PV Units

PV Units

isplay

D

Total Units

Total Units

ENT ESC

Basic
System
Calibration
Test

PV Units
PV Decimal
Total Units
Total Decimal

Basic
System
Calibration
Test

PV Units
PV Decimal
Total Units
Total Decimal

m3/h

m3/h

L/h

L/h

L

3

m

L

3

m

Resolution

The Series DFMT has a selectable resolution of up to 3 decimal points for both the
flow and totalization units.

To change flow resolution:

Steps

Operation Instructions

1

From the menu, select
“Basic”.

2

Select “PV Decimal”.

3

Use and to change
the desired flow resolution.

4

Press to select
resolution.

5

Press to confirm the
change, or press to
cancel the change.

Display

PV Decimal

PV Decimal

ENT ESC

Basic
System
Calibration
Test

PV Units
PV Decimal
Total Units
Total Decimal

3

3

3

2

To change totalization resolution:

Steps

Operation Instructions

1

From the menu, select
“Basic”.

2

Select “Total Decimal”.

3

Use and to change
the desired totalization
resolution.
Press to select

4

resolution.

Press to confirm the

5

change, or press to
cancel the change.

Display

Total Decimal

Total Decimal

ENT ESC

Basic
System
Calibration
Test

PV Units
PV Decimal
Total Units
Total Decimal

3

3

3

2