Surge Arrestor

Surface Pressure Distribution Map of the MOV Blocks Contacting Each Other

Fujifilm Prescale® pressure indicating sensor film is a diagnostic tool used for troubleshooting and maintenance. It reveals surface pressure distribution and magnitude between the MOV-blocks and the terminations in your high power arrestor application.

Why

  • Longevity of the arrestor is greatly improved when a lightening strike’s current is homogeneously distributed across the entire surface area of each of the MOV contacts.
  • Total device failure can occur if there is insufficient pressure holding the stack together.
  • Current limited by high pressure "hot spots" reduces the protection level of the arrestor.
  • Using Fujifilm Prescale® ensures proper compression load level as well as distribution of that load (uniformity).
  • Fujifilm Prescale® sensor film applied during testing and analysis helps ensure a maximally performing protection device.

To ensure long arrestor lifetime, the MOV’s disks need to be sufficiently compressed together to withstand multiple lightening strikes.



Pressure Film Type Pressure Range
Extreme Low (LLLLW / 4LW)
7.2 - 28 PSI
(0.5 - 2 kg/cm²)
Ultra Low (LLLW)
28 - 85 PSI
(2 - 6 kg/cm²)
Super Low (LLW)
70 - 350 PSI
(5 - 25 kg/cm²)
Low (LW)
350 - 1,400 PSI
(25 - 100 kg/cm²)
Medium (MS)
1,400 - 7,100 PSI
(100 - 500 kg/cm²)
High (HS)
7,100 - 18,500 PSI
(500 - 1,300 kg/cm²)
Super High (HHS)
18,500 - 43,200 PSI
(1,300 - 3,000 kg/cm²)

Physical Specifications
Operating Temperature 41°F - 95°F (5°C - 35°C) much higher for brief exposure
Humidity Range 20% to 90% RH
Gauge (Thickness) 4 - 20 mils
Spatial Resolution From 5 - 15 microns
Substrate Polyethylene Terephthalate (PET)
Accuracy ± 10% visual, ± 2%
Utilizing optional optical measurement systems
Shelf Life 2 Years