The base 100 SE has no digital communication (no RS-485, no Modbus). Some late-production “SE-R” variants had optional RS-485, but they are rare. Make it better: You cannot add comms. However, you can make the system better by using the 4-20mA analog retransmission option (if fitted) to send PV to a PLC analog input. Without that, consider this a reason to replace (see Part 5).
Not every process needs Bluetooth setup, data logging, or Ethernet/IP. For a single-zone oven, a heated platen press, or a small dryer hopper, the 100 SE offers overkill simplicity. Its auto-tune routine, while basic by today’s standards, often finds a stable PID set faster than some entry-level Chinese controllers with poorly implemented fuzzy logic. crawford automatic 100 se better
However, as parts become scarce and smart home integration becomes standard, property owners frequently ask: Is keeping the classic Crawford Automatic 100 SE better than replacing it with a modern system? The base 100 SE has no digital communication
Unlike modern plastic-heavy alternatives, the 100 SE was known for its "overbuilt" nature. It utilized a robust 220V AC power system and was often found in installations that outlasted the houses themselves. Users today still report units from the 1990s functioning perfectly, a testament to the engineering that avoided protruding dangerous parts and included safety features like finger-pinch protection. The Modern Renaissance: Going Smart However, you can make the system better by