Vaisala Thunderstorm Electric Field Mill EFM550


Vaisala Thunderstorm Electric Field Mill EFM550 integrates with Vaisala local-area, real-time lightning systems to monitor the development and dissipation of overhead lightning threats by measuring the local atmospheric electric field. EFM550 data can be displayed using optional Vaisala ALARM Automated Lightning Alert Risk Management Software to show current electric field measurements numerically and graphically.

The EFM550 integrates with local-area, real-time lightning information systems:

  • Vaisala Thunderstorm Lightning Warning System TWX300
  • Vaisala Thunderstorm Sensor TSS928 with Vaisala ALARM Automated Lightning Alert
Technical Specifications
Operational Specifications
Accuracy+/- 5% of reading offset +/- 50 v/m
Response Time1 Sec
Signal InterfaceRS-232 (8 bit binary, 1200 baud)
SamplingFixed 2/sec message rate
Range+/- 10 kV/m, max.
Environmental Conditions
Operating/Storage Temperature Range-10 °F to +115 °F (-23 °C to +46 °C)
Humidity0% to 100%
MotorBrushless; 25,000 hours MTBF
Cable4-twisted pair, 24 AWG min
Voltage100-240 VAC, 50-60 Hz; or 20-30 VDC
Power ProtectionMulti-stage transient protection
PowerConsumption 2.3 watts
- Hardware included for convenient mounting to a vertical pipe or flat mounting surface.
- Minimum 6.0 in.(15.2 cm) clearance from bottom of junction box to mounting surface.
- Maintain a minimum of 18.0 in.(45.7 cm) area clear between mill head and mounting surface.
Support Services and Standard Warranty
Training, technical support, spare parts and service agreements are available for maintaining optimal sensor performance. Vaisala warrants all products manufactured by Vaisala to be free from defects in workmanship or material for one year from the date of delivery. Contact your Vaisala Sales Representative for specific support services and product warranty details.
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