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Series HFO Flow Alarm

Specifications – Operating Instructions

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]

Bulletin F-HFO

Series HFO Flow Alarms are typically used to

make or break a set of electrical contacts to

signal a limit setting. They may be used to turn

on a warning light, sound a bell or horn, or even

to shut down a process. The switches on the

flow alarm can be configured to open or close a

contact for an increasing or decreasing set

point. Decreasing flow set points may be

located anywhere in the lower 2/3 of the scale

while increasing set points may be located

anywhere in the upper 2/3 of the scale.

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 HFO Flow Alarm

switches.

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.

Temperature Limits: 170°F (76°C).

Pressure Limits: See Chart.

Enclosure Rating: NEMA 4X (IP65).

Accuracy: Measuring ±4% FS over entire

range; ±2.5% over center third of the

measuring range.

Repeatability: ±1% of full scale.

Switch Type: SPDT, 10A @ 250 VAC; 0.5A @

125 VDC (resistive), 1/4 hp @ 250 VAC

(inductive); 3A @ 125 VAC “L” lamp load.

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).

PRESSURE DIFFERENTIAL VS. FLOW RATE

1/4˝ FEMALE NPT 1/2˝ FEMALE NPT 3/4˝, 1˝ & 1-1/2˝ FEMALE NPT

1 2 3 4

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Página 1 - Series HFO Flow Alarm

Series HFO Flow AlarmSpecifications – Operating InstructionsDWYER INSTRUMENTS, INC.Phone: 219/879-8000 www.dwyer-inst.comP.O. BOX 373 • MICHIGAN CITY,

Página 2 - Illustration 3

Operation:Illustration 1 shows the primary mechanism fora single flow alarm. The HFO dual-switch flowalarms contain two sets of these same

Página 3 - Illustration 7, Low Alarm

White Both Common Terminal #1 of DINBlack Decreasing N.O. Terminal #2 of DIN ContactRed Increasing N.O. Terminal #3 of DINContactGreen Enclosure Groun

Página 4 - DWYER INSTRUMENTS, INC

DWYER INSTRUMENTS, INC.Phone: 219/879-8000 www.dwyer-inst.comP.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A. Fax: 219/872-9057 e-mail: info@dwyer-

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Dwyer HFO Manual do Utilizador

Consulte online ou descarregue Manual do Utilizador para Acessórios para ar Dwyer HFO. Dwyer HFO User Manual Manual do Utilizador

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