Product Overview
When vibration monitoring points sit inside a hazardous area, the housing is not a minor accessory — it is what makes the measurement legally and practically possible. The Bently Nevada 107770-03-02 is a Velocity Transducer Housing, CENELEC approved, supplied as new and original in factory packing. It combines the 330500 Velomitor Sensor with a 21128 Housing, preinstalled at the factory, so the assembly arrives ready for a Zone 1, Group IIC environment.
Technical Specifications
Threads and Cable Exit
The mounting thread option on this unit is 03, which is 1/2-14 NPT. The cable exit fitting option is 02, also 1/2-14 NPT and explosion-proof. Matching both ends to the same thread standard simplifies field installation and reduces the chance of a mismatched gland at the enclosure wall.
Hazardous Area Rating
The housing is rated for CENELEC Zone 1, Group IIC applications. It also carries ATEX/IECEx conditions of safe use. For Zone 0/1, the equipment must be connected to equipment meeting the listed entity parameters, and cables type A or B in compliance with EN 60079-25 must respect the cable parameters listed with the entity parameters. For Zone 2, the supply electrical parameters shall not exceed the values in the applicable tables.
RoHS Compliance
The unit meets RoHS Directive 2011/65/EU.
Why This Housing Solves a Real Problem
A common failure mode in hazardous-area vibration monitoring is not the sensor itself but the interface: a housing that cannot accept the right cable gland, or a thread mismatch that leaves an installer improvising at the last minute. The 107770-03-02 addresses that directly. Because the 330500 Velomitor Sensor and 21128 Housing are preinstalled at the factory, the mechanical and electrical interface is already established before the unit ships.
Applications
Oil and Gas Pump Monitoring
On a Zone 1 pump skid, this housing lets a Velomitor sensor sit in the measurement location while keeping the cable exit sealed and explosion-proof. The 1/2-14 NPT cable exit fitting matches common field wiring practices.
Compressor Trains in Group IIC Environments
Group IIC covers the most demanding gas groups. A CENELEC-approved housing with the correct entity parameters gives engineers a documented path to safe installation rather than a site-specific workaround.
Replacement of an Existing Monitoring Point
When an existing housing is damaged or its thread form no longer matches available glands, this factory-assembled version restores the measurement point without re-engineering the bracket or the cable entry.
Installation and Setup
Mount the housing using the 1/2-14 NPT mounting thread. Route the cable through the 1/2-14 NPT explosion-proof cable exit fitting. Verify that connected equipment meets the listed entity parameters, and confirm that cables type A or B comply with EN 60079-25 and respect the cable parameters listed with the entity parameters. For Zone 2, ensure supply electrical parameters do not exceed the values in the applicable tables. Always follow the manufacturer’s safety documentation for hazardous-area work.
Maintenance and Reliability
Inspect the housing periodically for thread condition, seal integrity, and cable gland tightness. Because the assembly is factory preinstalled, the primary wear points are the mechanical interfaces rather than internal electronics. Keep spare glands and correct thread forms on hand so a damaged fitting does not idle a monitored machine. For teams running critical rotating equipment, having this housing ready-to-ship shortens the gap between fault detection and repair.
Selection Checklist
Before ordering, confirm the mounting thread (1/2-14 NPT), the cable exit fitting (1/2-14 NPT explosion-proof), and the hazardous area classification (CENELEC Zone 1, Group IIC). Confirm the connected equipment and cable types meet the entity parameters. Oil AutoTech provides hands-on technical selection help for these checks. Contact Oil AutoTech today for pricing and availability.
Please verify current lifecycle status and availability with Oil AutoTech before ordering.
