Product Overview
The Bently Nevada 107770-02-03 is a factory-assembled velocity transducer housing that pairs the proven 330500 Velomitor Sensor with a 21128 Housing. For maintenance engineers working in hazardous process areas, this means one part number covers the sensor, the protective housing, and the cable interface — no field assembly, no mismatched components, no guesswork at the install point.
This unit carries CENELEC approval for Zone 1, Group IIC applications. It is also rated for ATEX/IECEx Zone 0/1 and Zone 2 conditions of safe use, which makes it a practical choice for oil, gas, and petrochemical machinery protection where vibration monitoring must continue inside classified areas.
Technical Specifications
| Specification | Value |
|---|---|
| Mounting Thread | 3/4-14 NPT |
| Cable Exit Fitting | 1/2-14 NPT explosion-proof with cable gland seal |
| Hazardous Area Rating | CENELEC Zone 1, Group IIC; ATEX/IECEx Zone 0/1 and Zone 2 conditions of safe use |
| Assembly | 330500 Velomitor Sensor preinstalled in 21128 Housing |
| Compliance | RoHS Directive 2011/65/EU |
| Condition | New & Original in Factory Packing |
The 3/4-14 NPT mounting thread is a standard pipe thread found on many bearing housings and machine casings, so it threads in without adapters. The 1/2-14 NPT cable exit includes an explosion-proof cable gland seal, which keeps the enclosure rating intact where the cable leaves the housing. Both thread sizes are fixed by this model’s option codes — 02 for mounting and 03 for cable exit — so verify your machine port before ordering.
Where This Housing Fits
A velocity transducer housing like the 107770-02-03 suits rotating equipment where the measurement point sits inside a classified area. Typical examples include compressor bearing housings on gas trains, pump casings in refinery process units, and driver-end bearings on turbines inside Zone 1 envelopes. In each case, the housing protects the Velomitor sensor and the cable gland from the environment while maintaining the hazardous-area rating.
For maintenance teams, the value is serviceability. Because the sensor and housing arrive preinstalled, a failed transducer can be replaced as one line item rather than two. That shortens the window between fault detection and machine restart — a real cost factor when an unplanned trip hits production.
Installation and Service Notes
Mount the housing using the 3/4-14 NPT thread and confirm the seal at the machine port. Route the cable through the 1/2-14 NPT explosion-proof gland and tighten the seal so the cable entry stays protected. In Zone 0/1, connect the equipment only to equipment meeting the listed entity parameters, and use cable type A or B in compliance with EN 60079-25, respecting the cable parameters listed with the entity parameters. In Zone 2, keep supply electrical parameters within the values in the applicable tables.
During routine inspections, check the gland seal for tightness and look for thread corrosion at the mounting point. Follow the manufacturer’s safety manual for all hazardous-area work. Please verify current lifecycle status and availability with Oil AutoTech before ordering.
Ordering and Support
Oil AutoTech supplies ready-to-ship spares for oil, gas and industrial automation applications, with fast dispatch worldwide. If you are unsure whether the 02/03 thread combination matches your machine, the team offers hands-on technical selection help to confirm the correct configuration. Contact Oil AutoTech today for pricing and availability.
