M3
Low cost for sophisticated applications
Heat / Cool temperature controller
1/16 DIN - 48x48 mm 
   - 3 relay outputs
   - Start-up function
   - Timer
   - Current transformer input

M4
Flexible, easy and comprehensive
Heat/Cool temperature controller with analog output
1/16 DIN - 48x48 mm 
   - 3 relay outputs
   - Current transformer input
   - Digital input
   - 0/4 ...20 mA output

M5
Sophisticated multifunction process controller for reduced stock     
Process controller with Setpoint programmer 
1/16 DIN - 48x48 mm 
   - Update time: 50 ms     
   - 3 relay outputs + 1 analogue output     
   - PID, ON-OFF or valve control algorithm     
   - Fast view   
   - Memory Chip