Ever wonder if you can mix brands of thermocouple heads, transmitters, or junction blocks? The other day, I was trying to figure out if I could, and I ran into a spec I didn’t understand – DIN Form B. So, what exactly is DIN Form B, and how does it relate to thermocouple heads, transmitters and junction blocks?
Here’s what I found…
DIN is the German institute for standardization. The DIN Form B standard defines the mounting screw spacing, maximum diameter and height for field-mounted temperature transmitters.
A DIN Form B terminal block or head-mounted transmitter will fit and mount in any DIN Form B head. So, in theory, all DIN form B heads and transmitters are interchangeable. (Look for the 1.313″ or 33.35mm nominal spacing for the mounting screws.) The implication of DIN form B is that the size of a head-mounted transmitter is limited. Most transmitters that are not hockey puck styles will not fit in a DIN form B head.