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Pulse Output Water Meters
Overview and Selection Guide

What is Pulse Output?

When it comes to water meters, a pulse output is simple SPST (single pole, single throw) dry contact reed switch. The switch is normally open. The switch closes when a magnet is in close enough proximity to pull the reed to the closed position. The magnet is positioned on a dial (or drum in some cases) that rotates due to water flow. When the magnet travels far enough away, the reed is released and the switch opens. The closure and opening of this switch is a single "pulse." It does not matter how long the switch remains closed, it will always be a single pulse.

pulse output switch

Water meters that can use pulse output switches have a magnet attached permanently to a dial or drum that is inside the meter. The most common pulse output switch attaches to the lens of the meter's register, directly above a dial that has the magnet attached. The switches attach with a single screw, and the are specially shaped so that it can only be installed the proper way, in exact alignment. Certain meters allow for a choice of which dial to use for the pulse output, thus determining the volume of water that is represented by a pulse. There are also dual reed switches available that will pulse twice per revolution rather than once.


Mechanical Water Meters with Pulse Output Available

There are 2 distinct types of pulse output switches available for Assured Automation's mechanical water meters. Only the correct switch type is offered when buying any meter, so you need not worry about selecting the proper type. Simply check the "Include a Pulse Output" checkbox while configuring your meter.

These switches can also be retro-fit as an upgrade at a later date.

The switch shown here is for the WM-NLC and WM-PC series meters. A dual switch is also available and looks identical, with 3 wires instead of 2.
This switch is for the WM-PD series meters. The extended portion of the switch inserts into the meter.

Water Meters with Pulse Output Available

WM-PC (Lead Free)

Plastic Water Meter

Body Material:
Fiber reinforced polymer
(NSF/ANSI 61 Annex G certified)

Connections:
1/2" to 1 1/2" NPT

Flow Ranges:
1 - 20 gpm to 5 - 75 gpm

WM-NLC (Lead Free)

Lead Free Brass Water Meter

Body Material:
Lead free EcoBrass
(NSF/ANSI 61 Annex G certified)

Connections:
1/2" to 2" NPT

Flow Ranges:
1 - 20 gpm to 8 - 160 gpm

WM-NLCH (Lead Free)

Lead Free Brass Hot Water Meter

Body Material:
Lead free EcoBrass

Connections:
1/2" to 2" NPT

Flow Ranges:
1 - 20 gpm to 8 - 160 gpm


WM-NLD (Lead Free)

Positive Displacement Lead Free Water Meter

Body Material:
Lead free brass

Connections:
1/2" to 1 " NPT
1 1/2" to 2" Flanged

Flow Ranges:
1 - 20 gpm to 5 - 75 gpm

WM (NOT Lead Free)

Bronze Water Meter

Body Material:
Epoxy coated bronze

Connections:
1/2" to 2" NPT

Flow Ranges:
1 - 15 gpm to 8 - 120 gpm

WM-PD (Lead Free)

Plastic Low FLow Water Meter

Body Material:
Glass reinforced polyamide

Connections:
1/2" to 3/4" NPT

Flow Ranges:
6.6 - 660 gpm to 10.6 - 1056 gpm

Need Help Selecting a Pulse Output Water Meter?
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© Assured Automation. We reserve the right to make technical changes at any time.
Please contact us to verify any information that is critical to your application.