Dwyer HFT User Manual

Dwyer instruments, inc, Bulletin f-hft

Series HFT Flow Transmitters

Specifications – Operating Instructions

BULLETIN F-HFT

Series HFT Flow Transmitters are typically used to
transmit a signal proportional to flow rate to a process
control computer, a PLC, a recorder, or a panel-mount
display. The Flow Transmitters are used as the primary
input device to record flow rates through hydraulic and
pneumatic systems. The universal output transmitter
circuit employed by the Series HFT Flow Transmitter is
capable of producing output signals of 4-20mA, 0-5
VDC, and 0-2000 Hz square wave pulse. A 1-5 VDC
signal may be obtained from the 4-20 mA signal by
placing a 249 Ω resistor in parallel with the receiver.

Note: Refer to Series HF In-Line Flow Monitor, Bulletin
F-55, “Installation and Operating Instructions” for
installation, operation, and cleaning instructions for the
basic flow monitor cartridge (included). The following
instructions are specifically for the Series HFT circuitry
for transmitting a proportional output signal.

4.500

7.125

SPECIFICATIONS
Service: Compatible gases or liquids.
Wetted Materials: Body: Aluminum, brass or 304 SS;
Seals: Buna-N or Fluoroelastomer; Magnet: PTFE
coated Alnico; Other internal parts: 304 SS.
Viscosity Limit: 500 SSU.
Accuracy: ±4% FS over entire range; ±2.5% over
center third of the measuring range.
Repeatability: ±1% of full scale.
Response Time: <100 msec.
Output Signal: 4-20 mA; 0-5 V; 1-5 V.
Temperature Limits: 170°F (76°C).
Pressure Limits: See Chart.
Power Requirements: 12-35 VDC.
Enclosure Rating: NEMA 4X (IP65).
Shipping Weight: 1/4 to 1/2˝ female NPT Models: 3
lb (1.4 kg); 3/4 to 1˝ female NPT Models: 4.5 lb (2.0
kg); 1-1/2˝ female NPT Models: 12 lb (5.4 kg).

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]

PRESSURE DIFFERENTIAL VS. FLOW RATE

1/4˝ FEMALE NPT

1/2˝ FEMALE NPT

3/4˝, 1˝ & 1-1/2˝ FEMALE NPT

2.0

1.5

1.0

0.5

HFT-1123

HFT-1112

Flow Rate: SCFM @ 100 PSIG

0 5 10 15 20 25

Flow Rate: GPM

HFT-2320

HFT-2315

HFT-2440

HFT-2550

0 10 20 30 40 50