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The 330750 and 330752 High Temperature Velomitor System sensor head and integral cable are designed for high temperature environments. This enables you to mount the sensing head on surfaces with temperatures up to +400°C (+752°F).   To accomplish this, the transducer design segregates thesensing element from the signal conditioning electronics. The two are permanently connected using an integrated cable. The integrated cable eliminates connectors which are a significant source of transducer failures.

The cable enables you to position the signal conditioning electronics in a cooler location. The internal electronics withstands temperatures of 55°C to +121°C (-67°F to +250°F). The integrated design makes it possible to capture machinery performance data comparable to other Bently Nevada Velomitor transducers, but at significantly higher temperatures.

For lower temperature environments, use the standard 330500 Velomitor Piezo-velocity Sensor. You can install it in locations with a maximum operating temperature of +121°C (+250°F).

Frequently Asked Questions

Q : What are the maximum operating temperatures for this system?

The system uses a split design. The sensor head and hardline cable handle -55°C to +400°C (-67°F to +752°F). The remote electronics housing handles -55°C to +121°C (-67°F to +250°F).

Q : Is the hardline cable resistant to corrosive chemicals?

Yes. The integral hardline cable is jacketed in 316L stainless steel, offering excellent resistance to industrial solvents, oil, and corrosive chemical vapors.

Q : What is the exact scale factor (sensitivity) of the 330750 system?

The system provides a nominal sensitivity of 5.7 mV/mm/s (145 mV/in/s) ±5% at a reference frequency of 100 Hz.

Q : What is the standard Output Bias Voltage (OBV) for troubleshooting?

The normal open-circuit output bias voltage is -12 VDC ± 2 VDC relative to the COM terminal when powered correctly.

Product Applications

Power Industry: Monitoring the vibration of bearing housings and casings in high-temperature rotating equipment such as steam turbines and large generators.

Oil and Gas Industry: Used in high-temperature compressors, industrial gas turbines, and other equipment in oil refineries and chemical plants.

Chemical and Metallurgical Industries: Performing long-term vibration monitoring and safety protection on high-temperature, high-pressure industrial process equipment.