When a Zone 1 Installation Stalls, the Housing Should Not Be the Hold-Up
A maintenance team on a gas compression skid had the sensor, the cable, and the permit to work. What they did not have was a CENELEC-approved housing that could take a 3/4-14 NPT mount and still route the cable through an explosion-proof 1/2-14 NPT fitting. That is the exact gap the Bently Nevada 107770-02-02 closes.
What the 107770-02-02 Actually Is
This is a Velocity Transducer Housing from Bently Nevada, supplied as a factory-assembled combination of the 330500 Velomitor Sensor and a 21128 Housing. Because the sensor and housing are preinstalled at the factory, the assembly arrives as one unit rather than two parts that must be matched in the field. It carries CENELEC approval and is rated for Zone 1, Group IIC hazardous area applications.
Key Specifications
| Parameter | Value |
|---|---|
| Mounting Thread | 3/4-14 NPT |
| Cable Exit Fitting | 1/2-14 NPT, explosion-proof |
| Hazardous Area Rating | CENELEC Zone 1, Group IIC |
| Compliance | RoHS Directive 2011/65/EU |
| Condition | New & Original in Factory Packing |
The mounting thread and cable exit are the two numbers that decide whether this unit drops into an existing port or forces a rework. Both are fixed by the -02-02 ordering suffix, so confirm them against your skid drawing before you commit.
Where It Fits
Oil and gas operators use this housing where vibration monitoring must continue inside a classified area. On a compressor train, the 3/4-14 NPT mount threads directly into a prepared boss, and the explosion-proof cable exit keeps the run sealed at the boundary. In Zone 1, Group IIC service, the assembly is designed to be connected to equipment meeting the listed entity parameters, with Type A or B cables per EN 60079-25 respecting those cable parameters. In Zone 2, supply electrical parameters must not exceed the values in the applicable tables.
Installation Notes
Thread the housing into the prepared 3/4-14 NPT port and confirm the cable exit orientation before final tightening, since the 1/2-14 NPT fitting sets the routing direction. Route cable through the explosion-proof exit and verify that the connected equipment and cable type satisfy the entity parameters for your zone. Do not substitute fittings or cable types outside the approved configuration.
Sourcing and Availability
Because this is a factory-assembled sensor-and-housing combination, it is not something most sites keep on the shelf. Oil AutoTech supplies fast-dispatch spares for oil, gas, and industrial automation applications, with quick worldwide delivery and hands-on technical selection help when you need to confirm the -02-02 suffix against your drawing. Contact Oil AutoTech today for pricing and availability.
Please verify current lifecycle status and availability with Oil AutoTech before ordering.
