A421 Digital Electronic Temperature Controller

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2.00 LBS
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A421 Controller

The A421 Series controls are single stage, electronic temperature controls with a single-pole, double-throw (SPDT) output relay. The controls feature an adjustable backlit LCD for viewing the temperature and status of other functions, and a three-button touchpad for setup and adjustment. An LED indicates the On/Off status of the output relay.

The A421 control is 120 VAC. The A421 controls provide heating or cooling control, sensor offset, temperature setback, adjustable anti-short cycle delay, and a restricted user adjustment mode. The temperature units can be displayed in °F or °C. The temperature adjustment range is -40 to 212°F or -40 to 100°C. The A421 automatically changes from heating and cooling. 

The A421 controls are available in Type 1/IP20 high-impact plastic enclosures suitable for surface or DIN rail mounting and Type 4X/IP66 watertight, corrosion-resistant surface mount enclosures.

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  • 5
    Exceptional performer at your price

    Posted by Richard Hansen on 10th Jul 2017

    The A421 digital electronic temperature controller is a excellent choice for whats on the market today. When compared to products offer by others, this is a win-win.
    I plugged it in, set the temp for 34F and cooled my Mailbock within 3-4 hrs in a Sears upright freezer. I have two of the these freezers.
    What I due is attach a piece of styrofoam over the temp probe and use packaging tape to secure it to the keg. The freezer can hold 6 kegs, and all one needs is the probe on one keg. The other kegs will reach this same temperature. I use another A421 for fermenting 30 gal of beer in an upright Freezer. Controls to 1-2 degrees. Just perfect for my brewing applications.