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The 330750-20-CN is a Bently Nevada high-temperature velocity sensor component featuring a specific cable length option and hazardous area country approvals/agency certification. It forms part of the High Temperature Velomitor System (HTVS) designed to measure machine vibration in extreme heat.

The cable enables you to position the signal conditioningelectronics in a cooler location. The internal electronicswithstands temperatures of 55°C to +121°C (-67°F to +250°F).The integrated design makes it possible to capturemachinery performance data comparable to other BentlyNevada Velomitor transducers, but at significantly highertemperatures.

Frequently Asked Questions

What is the Bently Nevada 330750?

It is a heavy-duty, high-temperature piezo-velocity sensor system used to measure machinery casing vibration.

What does the "-20" mean in 330750-20-CN?

It indicates the length of the integral cable (typically 2.0 meters) connecting the sensor head to the electronics.

What is the maximum distance I can run field wiring to the control room?

Up to 305 meters (1,000 feet) of high-quality shielded cable without significant signal degradation.

Why is a standard 4-20mA loop tester incompatible with this device?

The 330750 outputs a dynamic AC voltage signal (5.7 mV/mm/s) riding on top of a DC bias voltage. It does not output a static, filtered current loop signal; therefore, it requires an oscilloscope or a dynamic signal analyzer for verification.

Product Applications

Thermal power plants: Used for monitoring the casing vibration of gas turbines and steam turbines.

Petrochemical and oil refineries: Used for monitoring the vibration of large catalytic cracking flue gas turbines, high-temperature hot oil pumps, and hydrocracking compressor units.

Steel and metallurgical plants: Deployed on core power equipment around hot rolling mills, blast furnace blowers, sintering exhaust fans, and high-temperature converters.

Cement and paper mills: Used for measuring the casing vibration of heavy-duty, high-temperature rotating equipment such as cement rotary kiln drive fans and high-temperature paper drying cylinder bearings.