I thought I’d post an easy way to make a usable hopper alarm. You may already have the important part, a thermocouple display with alarm functions. If not, shop around on Ebay or ask some of our experienced operators.
You might think, well that’s easy - if it has an alarm, just hook it up and go. You’re right - just one issue. When the hopper alarm goes off at a certain temperature, you’ll probably be above that temp point for 5-10 minutes, as you look for a place to stop, pull off the highway, get out and refuel. Listening to a buzzer for that long is annoying.
Having a way to “hush” the alarm makes it into an actual usable system. I’ve tried complicated stuff in the past, but this works much better and is very easy. No electronics needed - just a single relay!
This setup will auto reset, meaning when the hopper cools off, then heats up again on your next hopper-empty event, it will go off as before, and you can mute it again.
All you need is:
- TC display with programmable alarm function
- push button (push to make)
- 87a type 5-pin relay
- door buzzer (can use existing)
Here’s the circuit:
Anyone who wants to see this in action, it’ll be on my truck at Argos.