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The Valstat® SM20 is a series real-time electrostatic charge monitoring system that continually measures, displays, and records surface voltage on charged moving objects. It is a useful safety and preventive maintenance device that finds use in many industrial applications.


Real time static charge monitoring system

Real time static charge monitoring system

The output signal from the Valstat® SM20 online electrostatic charge sensors ( minimum 1, maximum 18 sensors) can be connected to one or more colour touch panel HMIs for remote or local continuous monitoring and analytics. The collected data is monitored and when the measured value exceeds the measurement range or a pre-set safety level, an alarm sounded. The collected data can be stored, retrieved and analysed.
Manufactured by: Valence Electrons Private Limited, India


Distinct from a hand-held meter that is used to periodically measure static charges, the Valstat® SM20 is permanently fixed at the location where the target is to be monitored. Hence, variations in measurement due to different operators, location, and distance are completely eliminated. As a result, a real-time, accurate, and continuous signal proportional to the static charge is made available for further analytics and diagnostics. The discharge or neutralising effect of the static charge eliminator is efficiently monitored for continual safety, and preventive maintenance. Expensive man-hours for inspection, testing, and validation are also effectively reduced.

      Technical Details 
  • Power: 24 VDC + 15%, 6W max
  • Enclosure: IP66 protected touch screen
  • Operating temperature: 0ºC to 50ºC
  • Storage temperature: -20ºC to 80ºC
  • Humidity: 10% to 85% (non-condensing)
  • Communication ports: MODBUS RTU or Ethernet
  • Digital output for alarm/indicators: PNP/NPN and relay
  • Data logging/saving: 20MB (Internal) and 32 GB (optional external SD card)
  •   Valstat® SM20 sensor 
  • Measuring range -20 kV to +20 kV at 50 mm
  • Distance range 25 to 75mm, depending on the application
  • Operates on 24VDC ±10%
  • Current consumption < 40 mA
  • RS485, 2 wire MODBUS slave protocols
  • Operating temperature 0ºC to 50ºC
  • Humidity 35% to 85% RH, with no condensation
  •   Touch screen monitor 
  • Touch screen in different sizes 4.3” to 12.1”, depending on number of sensors used
  • Display of real-time static charge
  • Normal/high static charge level indication
  • Measuring distance selection
  • Alarm display
  • Switching digital output for alarm/warning
  • Data logging, storage, download and analytics with real time, historical trends
  • Compact and easy to mount
  • Improved safety
  • Reduced operator hazards
  • Improved productivity due to lesser machines stoppages
  • Frequent manual inspection not required
  • Prevention of quality-related problems
  • Data logging facility for future analysis

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