• WWIP-N
  • Usually ships in 1-2 weeks



  • Corrosion resistant water/wastewater field instrument protection
  • Protects 2-wire instruments
  • Maximum surge current: 10kA peak current (8/20μs waveform)
  • Leakage current: Less than 10μA at max. working voltage
  • Working voltage: 24-48VDC
  • Easy and direct mounting — screws into spare conduit entry
  • Parallel connection avoids introduction of any resistance into loop
  • 1/2” NPT threads
  • High Performance low cost protection
  • 10 year product warranty


The MTL WWIP-N is a high-powered surge protector with solid-state electronics and a gas-filled discharge tube (GDT) capable of diverting 10kA impulses providing far more protection than the transient protection available from the transmitter manufacturers. Specially designed for 2-wire field-mounted instruments in the water/wastewater industry, the WWIP-N is encased in a corrosion resistant ANSI 316 stainless steel housing.

Installation of the WWIP-N can easily be carried out retrospectively to existing installations. The unit is screwed into any unused conduit entry on the field instrument case and flying leads are connected to the terminal block (+ve, -ve) and the internal earth stud. The WWIP-N operates without in any way affecting normal operation - passing ac or dc signals without attenuation while diverting surge currents safely to earth and clamping output voltages to specific levels. The WWIP-N is available for 1/2" NPT threaded entries.

The all-important earthing connection is made to the local casing of the transmitter with no separate earth connection or ground stake at the transmitter being needed. In operation, the WWIP-N makes sure that the transmitter electronics are never exposed to damaging transients between lines or between lines and casing/earth. Any surge current appearing as a series-mode or common-mode transient is converted into a common-mode voltage - whereupon the transmitter electronics are temporarily raised to some higher voltage level before ‘floating' down automatically (and without damage) to resume normal operation.