Hedland Flow Switches and Transmitters for Water-based Fluids

Flow Alert micro or reed flow switches and multi output transmitters for Water-based fluids

Starting at
$441.00
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Features

  • Manufactured by Hedland
  • 0.02-150 GPM (0.1-560 LPM)
  • 1/4 to 1-1/2 inch ports
  • SAE, NPTF and BSPP ports
  • Anodized and epoxy-coated aluminum housing w/ polycarbonate lens
  • NEMA 12 and 13 (IP65)
  • 240°F (116°C) max.
  • Pressure up to 6,000 psi (414 bar) maximum
  • ±2% full scale accuracy
  • ±1% Repeatability

The Hedland Flow Alert Flow Switches and Transmitters for Water-based Fluids combines a direct reading, piston-type, variable area flow meter with a linear potentiometer. This compact package provides the user instantaneous flow rate indication as well as the capability to interface with virtually all analog process control devices. This meter has a NEMA 12 and 13 (IP65) rated aluminum enclosure to seal against industrial contamination.

Depending on the application, there is a choice of switch options for the Hedland flow switches and ttransmitters. The micro switch is available in a single (1) or double (2) prewired single-pole, double-throw (SPDT). The reed switch is available in a single (1) or double (2) prewired single-pole, single-throw (SPST-NO) normally open or single-pole, single-throw (SPST-NC) normally closed.

Hedland aluminum and brass flow switches have a pressure rating of 3,500 psi/241 bar maximum with a 3:1 safety factor in liquids and a pressure rating of 1,000 psi/69 bar maximum with a 10:1 safety factor in gases. Stainless steel flow switches have a pressure rating of 6,000 psi/414 bar max. (5,000 psi/345 bar maximum for 3/4" to 1-1/2" series) with a 3:1 safety factor for liquids and 1,500 psi/103 bar maximum with a 10:1 safety factor for gases.

Operating Principle

All Hedland variable area flow meters use a sharp-edged annular orifice, formed between the open-centered piston and a contoured metering cone. The piston is held in a "no flow" position at the base of the contoured cone by a calibrated retention spring. Flow through the meter creates a differential pressure across the piston orifice, moving the piston against the spring. The greater the volume, the further the piston moves. Externally, the flow indicator is magnetically-coupled to the moving piston. The indicator is visually "read" against a graduated flow scale.

Hedland electronics convert fluid flow rate to proportional analog output signals of 4-20 mA, 0-5 Vdc, and 0-10 Vdc. Each sensor is "loop powered" and inherently isolated, operating on a 4-20 mA current. A DC power source must be used to provide the necessary excitement to the product.

Features of the Hedland Flow Alert Flow Switches and Transmitters for Water-based Fluids:
  • Automatically signals alarm if flow is too high or too low
  • Automatically opens or closes electrical circuits
  • Triggers warning lights, buzzers and other devices
  • Shuts down pumps and/or other equipment to protect your operation against permanent damage
  • Available in aluminum, brass and stainless steel
  • Installs in any position
  • Easier-to-read linear scale
  • No flow straighteners or special piping requirements
  • Relatively insensitive to shock and vibration
  • Special scales available
Accessories
Please consider these optional accessories.
Red Lion PAXP Panel Meter
1/8 DIN analog input panel meters
Starting at
$248.00