Product Overview
Downtime on a turbine train or compressor skid rarely waits for a purchase order. The Bently Nevada 107770-04-01 Velocity Transducer Housing, CENELEC approved, exists to remove one common cause of that delay: field assembly of a sensor and its protective housing. This unit ships as a factory-preinstalled combination of the 330500 Velomitor Sensor and a 21128 Housing, so the installer mounts one finished assembly instead of two separate components.
For maintenance teams, that translates into fewer labor hours per loop and fewer chances for a sealing or threading error during commissioning.
Key Parameters
| Specification | Value |
|---|---|
| Part Number | 107770-04-01 |
| Model | Velocity Transducer Housing – CENELEC approved |
| Manufacturer | Bently Nevada |
| Mounting Thread | 1/2-14 BSP (Option 04) |
| Cable Exit Fitting | 1/2-14 NPT plug (Option 01) |
| Hazardous Area Rating | CENELEC Zone 1, Group IIC |
| Approvals | ATEX/IECEx, RoHS Directive 2011/65/EU |
| Condition | New & Original in Factory Packing |
What the Thread and Fitting Options Mean in Practice
The 1/2-14 BSP mounting thread lets the housing seat directly into a standard machine casing port without an adapter. The 1/2-14 NPT cable exit plug seals the cable entry point until the field cable is terminated. Both choices reduce the number of loose parts a technician carries to the machine, which shortens the window between isolation and return to service.
Why the Hazardous Area Rating Drives Cost
Because the assembly is rated for CENELEC Zone 1, Group IIC applications, it can be installed in areas where a standard housing would require additional barriers or a different enclosure strategy. Fewer add-on components means a lower total installed cost per measurement point.
Where This Housing Fits
Oil and gas operators use velocity transducer housings like this on rotating equipment where vibration data feeds protection and condition-monitoring systems. Three common placements:
- Compressor skids in Zone 1 process areas, where the Group IIC rating allows direct mounting without relocating the measurement point.
- Steam turbine trains, where the preinstalled 330500 Velomitor Sensor and 21128 Housing save a full assembly step during a turnaround.
- Pump packages on offshore platforms, where the sealed cable exit fitting protects the connection from wash-down and salt-laden air.
In each case, the cost argument is the same: one part number to order, one assembly to mount, and one less interface to troubleshoot.
Installation Notes
Mount the housing using the 1/2-14 BSP thread, then terminate the field cable through the 1/2-14 NPT plug opening. Follow the entity parameters and cable requirements stated in the manufacturer’s hazardous area documentation, including the cable type A or B requirements referenced for Zone 0/1 installations. For Zone 2, keep supply electrical parameters within the values listed in the applicable tables.
Because this is safety-relevant equipment in a classified area, keep maintenance general: inspect periodically for mechanical damage and follow the manufacturer’s safety manual. Do not modify the housing or substitute fittings.
Sourcing and Availability
Please verify current lifecycle status and availability with Oil AutoTech before ordering. Oil AutoTech supplies ready-to-ship spares for oil, gas and industrial automation applications, with fast dispatch worldwide and hands-on help matching the correct thread and fitting options to your machine. Contact Oil AutoTech today for pricing and availability.
