Dwyer PFT - Manual

INSTALLATION
Ensure that the process fluid is compatible with the wetted materials, and
do not exceed the maximum device ratings.
Ensure that the system is not pressurized before installing or removing
this device or other objects from the system. The device and/or object
may become a projectile.
Fitting Position
Bubbles, turbulence, and sediments will cause improper operation. For best
operation, mount 30° to 150° off vertical on horizontal runs (See Figure 1). Allow a
straight run of at least 10 pipe diameters upstream and 5 pipe diameters
downstream to insure optimal flow measurement. See Table 1 for
recommendations for other mounting requirements.
Upstream Item
Flange
Reducer
Valve/Pump
90° Elbow
Series PFT Paddlewheel Flow Sensor
Specifications - Installation and Operating Instructions
Bulletin F-PFT
®
The Series PFT is a paddlewheel flow sensor used to monitor liquid flow rates in
pipes from 1-1/2 to 40˝ with one size adjustable sensor. A square wave output sig-
nal is generated with frequency proportional to flow velocity.
OPERATING PRINCIPLE
The PFT uses inductive sensing to sense the blades of the impeller as they rotate.
Sensor technology does not use magnets allowing low flow rate monitoring and no
concerns with magnetic material in the flow.
SPECIFICATIONS
Service: Water-based fluids.
Range: 1.2 to 25 ft/s (0.37 to 7.62 m/s).
Wetted Materials: Body and fitting: brass or 316 SS; fitting o-ring: FKM standard,
silicone or Buna-N optional; impeller: 316 SS; shaft: tungsten carbide standard or
316 SS optional; bearing: PTFE standard, carbon graphite optional.
Linearity: ±1.0% of full range.
Repeatability: ±0.5% of full range.
Temperature Limits: -40 to 212°F (-40 to 100°C).
Pressure Limits: 400 psig (27.6 bar) @ 100°F (37.8°C), 325 psig (22.4 bar) @
212°F (100°C).
Process Connection: 1-1/2˝ NPT male standard, 2˝ NPT male optional.
Output:
Pulse: NPN open collector with square wave output, rated 60 V @ 50 mA
maximum. Frequency: 3.2 to 200 Hz. Pulse Width: 2.5 msec ±25%.
4 to 20 mA: 4 mA is 0 ft/s, 20 mA is 25 ft/s.
Power Requirement: 10 to 35 VDC.
Power Consumption: 40 mA (max.).
Electrical Connection: 22 AWG shielded UL type PTLC rated 105°C, 20´ (6.1 m)
long with cable gland. Can be extended up to 2000´ (609 m) with similar cable.
Optional UL listed burial rated cable.
Enclosure Rating: NEMA 6P (IP67).
Housing Materials: Brass or 316 SS.
Weight: 3 lb.
Agency Approvals: CE.
W.E. ANDERSON DIV., DWYER
INSTRUMENTS, INC.
P.O. BOX 358 • MICHIGAN CITY, INDIANA 46361 U.S.A.
Phone: 219/879-8000 www.dwyer-inst.com
Fax: 219/872-9057 e-mail: [email protected]
Upstream Diameters Needed
10
15
50
20
Table 1: Fitting Location
∞ ∞
∞ ∞ 30 30
BUBBLES
(AVOID)
SEDIMENTS
(AVOID)
OK OK
30 30
Figure 1: Mounting Orientation
1/2˝ NPT
Ø2-1/2
[63.50]
3-13/16
[96.84]
1-1/2˝ NPT
2-25/64
[60.72]
7-29/32
[200.94]
2˝ HEX
[50.80]