RIKEN OPTECH CORPORATION > Safety Devices for Presses > 荷重監視装置 > PLA-4N Stage2

Safety Devices for Presses and Other Equipment

4-Channel Load Monitoring System

PLA-4N Stage2

*First released in China, Taiwan and Korea

PLA-4N Stage2 has the function of detecting the press load with four(4) pieces of strain gauge sensors. It displays the accurate load during press processing, and output stop signals and stops a press machine immediately when abnormality is detected. Monitoring cannot be ignored when there are eccentric loads for each stroke, and furthermore, load monitoring extends the life of dies, prevents friction and wear of presses, also promotes quality control and rationalization.


  • Easy to know the balance of loads applied to the left and right sides of the press, and to know improper balance, load center, etc., it facilitates die maintenance and quality control.
  • As a overload protector, it prevents from the damage of the dies by detecting double hits, mis-feed, change of material thickness etc., and estimates die regrinding intervals.
  • By knowing the suitable load for products, the selection of the press is facilitated.
  • The detector can be used to simultaneously set absolute value comparison (set value of upper/lower limits) and comparison with the value of the previous time.
  • The digital LED display is easy to read, and the bar display shows the left load and the right load in percentage.


●Power Supply and Output section
Power supply 85-264 VAC, 50/60Hz
Power consumption 75W or less
Output contact 1A・1B(emergency stop output / auxiliary output)
Output contact capacity 250VAC or less, 5A or less Cosφ=1
●Detection section No.of channels 4 channels
Detection range 100kN or more, available for press up to 90,000kN in capacity
Repeatability within 1% of device press capacity/Within 100-800% of channel capacity
Sensor Strain gauge type 4-bridge strain sensor
●Display section Display 1/2 inch 7-segment red LED, five-digit (per channel)
●Others Backup With semiconductor memory, backup time:10 years or more
Maximum SPM 2,000 spm
Temperature range working: -10℃-40℃(non freezing) / Storage:-20℃-55℃
Humidity range 10-85%RH (at wet bulb temperature of 229℃ or less, non condensation)