- Get to know your own technique
Do you already have something installed or are you going to put in a brand spanking new controller? In the event you need something new go straight to step. In the event you replace something existing make positive you check what is the controller connected to: What is the probe like? Is it a Thermocouple / Pt100 probe? Or does it deal with a 4-20mA signal? Then what output do you need? a relay switch? A signal for a SSR? A 4-20mA signal
- Select what type of quality you need
Here is the lovely news: most controllers out there will do the job for a basic technique. So the actual query is: Do I take the lowest priced item from China or do I trust a reputable manufacturer? The sizable difference is reliability (don't expect a Chinese controller to last over a few years) & accuracy. Cheap manufacturers make the specs look better than they actually are while reputable manufacturers coming from Japan or France for example have a strict quality technique in place.
- Shop around & Check the Information Sheet
Get on different web-site, try to get a feeling of the way the controllers work, are they simple to make use of, have they got a sizable display...
Checking the specifications can be confusing so here are some tips: all the controllers will accept Thermocouple, Pt100, Voltage/Current input & have a relay/ssr/current/voltage output option - the sizable difference is that you will must order it with the right input type for a substantial number of them as this cannot be changed afterwards. If it says "universal input" then you ought to have the ability to change the input type to whatever you need. Check also the amount of relay alarm you need & in the event you need any fancy stuff like RS485 communication and/or possibility to connect to a computer etc...
- Get on the phone!
All of this to ask for help? Yes but at least you are well prepared to ask for a quotation in the best conditions. In the event you don't go through the earlier steps before calling an sales rep chances are that you are going to finish up with the wrong item... or you are going to spend ages explaining what you are after!
- Don't forget the accessories!
Do you need a temperature probe? Some additional cable? An SSR (solid state relay)? A transmitter? Make positive you don't forget anything so that you can get on with the installation as soon as you get your temperature controller.
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