Electronics Technology For The Water Industry

  • ESDI Model 170258
    Single Price
    Single Volume
    Vends 1 Liter Up To 500 Gallons
    Timed or Metered Vending
    Multiple Credit Pulses
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    Water Vending Machine Controller
    Vend into many sizes of water storage containers
    Works with any coin or bill acceptor that produces pulses
  • ESDI Model 190100
    Features TDS Continuity Monitor and
    Pump Run Time Hour Meter
    Perfect for Manufacturers of Reverse Osmosis Systems
    lower your production costs by outsourcing the
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    electronic controls for your standard systems
    Reverse Osmosis System Controller
  • ESDI Model 190100
    Lockout Input will shut down operation during Pre-treatment Regeneration.
    Automatic Membrane Flush Cycles have switch selectable Flush Times and Frequencies.
    Pressure Switch Input will shut down the Pump for 5 minutes if the inlet pressure is bad.
    Reverse Osmosis System Controller
    Controls Water Inlet Relay & Membrane Flush Relay
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    Automatically maintains water storage Tank Level
    Program Switch enables 10 Minute Restart Delay, and 24 hour Full Tank Membrane Flush.
    TDS Continuity Monitor and Pump Run Time Hour Meter

Reliable Electronic Control Systems Since 1978

Electronic Systems Design, Inc. (ESDI) designs and manufactures dependable electronic control systems for the water treatment, water vending, and custom equipment industries.

For more than 35 years, our controllers have helped equipment manufacturers reduce development time, improve reliability, and bring products to market faster. From water vending machines and reverse osmosis systems to custom electronic control solutions, ESDI delivers proven products backed by real engineering expertise.

Whether you need a standard controller or a custom-designed solution, ESDI provides the experience, support, and reliability your business can depend on.

What We Offer

  • Water Vending Machine Controllers
  • Reverse Osmosis System Controllers
  • MDB-Compatible Control Systems
  • Custom Electronics Design and Manufacturing
  • Technical Support Directly from the Design Engineers

Built for Reliability

Our products are designed for long service life in demanding commercial environments. Every controller is thoroughly tested and backed by years of field-proven performance.

Need help selecting the right controller for your application?

Call us at 818-365-0864 and speak directly with an engineer.

Water Vending

Building a Water Vending Machine? Click here and choose the best controller for your system.

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Reverse Osmosis

Building a Reverse Osmosis Water Purification System? Click here and choose the best controller for your system.

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Why Choose ESDI?

When selecting a controller supplier, experience matters.

At ESDI, we combine decades of engineering experience with practical knowledge gained from thousands of real-world installations.

Experience You Can Trust

Over 35 years designing and manufacturing electronic control systems.

Industry-Specific Expertise

Specializing in water vending, reverse osmosis, and commercial control applications.

Proven Reliability

Products designed for long-term operation in demanding environments.

Direct Engineering Support

When you call ESDI, you speak with people who understand the products and the applications.

Custom Solutions Available

Need something unique? We can modify existing products or develop custom electronic controls tailored to your requirements.

Made in the USA

Designed and manufactured with quality and reliability as our highest priorities.