Marshall Wolf Automation your authorized A.J. Antunes distributor!
Please click from the air and gas pressure switches below or contact us for assistance!
The original Chicago Safety Products switch was called the Model D-1. The Model D-1 was a differential air pressure switch developed primarily for the industrial combustion market.
The D-1 air switch was used to sense air-flow across a burner. The first customer was Despatch Industries in Minneapolis Minnesota with an order for 100 switches.
Following a process of continuous improvement, the second generation of this air-flow switch was soon introduced. This model was called the JD-2.
The model was named as the second (2) generation of the differential switch (D). What does the J stand for? Always a strong family man, August Antunes used this opportunity to name this product for his children, Jim and Jane.
To compliment the air differential safety switch, gas pressure switches were soon added to the product line. These gas pressure switches are designed to sense gas pressure being supplied to a gas burner.