Hach Flow Sigma Sensors - Flow Sensores, Flow Meters

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Flow Meters, Flow Sensors – Open Channel

Sigma Series Flow Meters

Sigma Series Overview

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Sigma Sensors

Details/Specifications

»	Sigma 910
»	Sigma 911
»	Sigma 920
»	Sigma 930

»	Sigma 940
»	Sigma 950

Literature Download

	910 DS		910 Manual
	911 DS		920 Manual
	920 DS		911/940 Manual
	930 DS		930/930T Manual
	940 DS		950 Manual
	950 DS
	911 Intrinsically Safe (ATEX)
	Rain Gauge Instr. Sheet (for use with Model 980)
	Solar Power System Instruction Sheet for Sigma Flow Meters

Customer Testimonials

We have about 100 Sigma units that we own ourselves for temporary flow monitoring for our clients and there are around 200 permanent Sigma meters that we operate for various clients. We don’t have any problems with the meters so when it comes time to recommend a meter type for a proposal, that’s what we choose!” ~Frazier Engineering

“We’ve reduced a tremendous amount of I/I (with Sigma meters). In the areas that we have been working, the payback in rehabilitation costs is about eight years. Also, a $6 million treatment plant expansion will not be necessary because flows have been reduced.” ~Naperville, Illinois

“The 950 is a good meter. Of the meters I work with 90% have bubblers, (1) has ultrasonic, and (2) use the submerged pressure sensor. The meters are easy to configure, easy to set up and they are reliable.” ~Stephens Instrument Service

Sigma Flow Sensors

Submerged Pressure AV Flow Sensor

Robust, 1 Mhz Doppler frequency flow sensor with improved resistance to sensor fouling (Oil filled and Non-Oil Filled).

Available on Models 910, 911, 920, 930/930T, 940 and 950AV.

Ultrasonic Flow Sensor

Non-contact, low maintenance 75 KHz ultrasonic flow sensor provides higher resolution and long range.

Available on Models 920, 930/930T, 940 and 950/950AV.

In-Pipe Ultrasonic Flow Sensor

75 KHz flow sensor provides higher resolution and greatly reduces dead band. Sensor mounts directly in the sewer pipe.

Available on Models 920, 930/930T, 940 and 950/950AV.

Wafer Velocity Flow Sensor

Wafer thin flow sensor is ideal for high velocities and shallow depth sites.
Sensor is used with bubbler, in-pipe, or standard ultrasonic flow sensors.

Available on Models 920, 930/930T and 950AV.

AV Bubbler Sensor

Ideal for applications with high winds, high temperatures or when foam is present. The ow sensor is a combination of bubbler level technology and Doppler velocity is the favorite of storm water professionals.

Available on Model 950AV.