Flow Switch · Instrumentation & Gauges
The SIKA VH500NI, VH500NM, VH500RI and VH500RM are paddle-type flow switches covered by DNV certificate TAA000011M. They detect flow in a pipe and switch an electrical contact to signal flow or no flow. They are installed in cooling, lubrication and other process lines on board to monitor flow and trigger an alarm or interlock when flow is lost.
What our service work and the manufacturer documentation say about keeping this model running.
Function-test the switch by comparing its electrical state with confirmed actual flow in the connected system. Inspect the process connection for leakage and the electrical enclosure, terminals and cable gland for moisture or heat damage. When the switch is removed, examine the paddle for distortion, deposits and free movement before reinstalling it in the correct orientation. After replacement or piping modification, verify the interlock or alarm logic through the full operating sequence. Switching point, paddle dimensions, process limits and electrical ratings must be obtained from SIKA documentation for the exact VH500 variant.
| Shelf life / expiry check before use | per the batch expiry date - confirm the exact period against the product datasheet |
|---|---|
| Storage condition check | periodic, per the safety data sheet temperature limits |
| Joint/repair visual inspection after application | typically at each annual survey |
| Primer compatibility check | each application |
Structural or watertight bonding/sealing applications typically require the product's class Type Approval certificate to be referenced, with application records (batch, date, surveyor acceptance where required) retained for the specific repair or installation.
A complete matching flow switch is often the most useful spare because internal switching parts may not be intended for shipboard repair. Where the manufacturer supplies them separately, keep the correct paddle, process seal or gasket and approved electrical connector or gland parts. Spare units must match the installed process connection, material, switching function and electrical rating rather than only the VH500 family name.
Verified against the DNV Approval Finder — the certificate below is issued by DNV, not by us.
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