技术文章

Dwyer德威尔PFT流量计安装说明







Series PFT Paddlewheel Flow Sensor

Specifications - Installation and Operating Instructions

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 signal
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.


INSTALLA

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.

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