M21 & M31 INTELLIGENT PUMP CONTROLLERS

M21 and M31 Intelligent Pump Controllers are easy to use, programmable controlling & protection devices for direct start of deep well pumps, submersible pumps and surface pumps:
- M21 for single phase pumps with motor power between 0.75 kW and 2.2 kW (1 - 3 HP)
- M31 for three phase pumps in two versions: 0.75 - 4 kW (1 - 5.5 HP) and 5 - 7.5 kW (7 - 10 HP) 

CONTROLLER'S UTILITY FUNCTIONS
- Automatic start-up attemp after its emergency shutdown by one of the proctection function. Different self activation time for different emergency situations. 
- Pump accumulative running time displaying
- Cooperation with liquid level probes/sensors, float switches, pressure switches 
- Dynamic LCD screen displaying pump running state
- Pump five last five record displaying 
- Adjustable and re-adjustable to different pumps 
- Starts and stops the pump in accordance with the different liquid level or pressure setting 
- Auto/manual switch 

CONTROLLER'S PROTECTION FUNCTIONS 
- Double dry-run protection with the use of:
• liquid level probes/sensors,
• power consumption analysys
- Overload protection
- Phase failure protection (M31)
- Over/under voltage protection
- Voltage spike/surge protection
- Short circuit protection

EXAMPLE USE OF M31 & M21 INTELLIGENT CONTROLLERS