Bently Nevada 330500-00-20 Velomitor Sensor

The Bently Nevada 330500-00-20 belongs to the 330500 Velomitor family of piezoelectric velocity sensors. This sensor measures absolute casing vibration on rotating machinery. Moreover, it delivers reliable readings across harsh industrial environments.

Technical Specifications

Parameter	Value
Model Number	330500-00-20
Series	330500 Velomitor
Sensor Type	Piezoelectric velocity transducer
Sensitivity	3.94 mV/mm/s (100 mV/in/s)
Frequency Response	4.5 Hz to 1,000 Hz
Amplitude Range	0 to 1,270 mm/s (50 in/s)
Weight	Approximately 140 grams
Mounting Thread	1/4-28 UNF
Connector Type	2-pin MIL-C-5015
Operating Temperature	-55°C to +150°C
Output Impedance	100 ohms nominal
Power Requirement	Self-generating, no external power

Mounting and Interface Details

The sensor installs directly onto the machine casing through a 1/4-28 threaded stud. Consequently, technicians achieve solid mechanical coupling with minimal effort. A 2-pin MIL-C-5015 connector carries the velocity signal to monitoring equipment. Meanwhile, the rugged stainless steel housing resists corrosion and mechanical impact.

Signal Generation and Energy Characteristics

The 330500 Velomitor generates its own signal through piezoelectric crystal deformation. Therefore, it requires no external excitation voltage or energy storage. This self-generating design simplifies wiring and reduces installation cost. Additionally, the internal crystal produces a voltage proportional to casing velocity.

System Integration and Applications

This sensor pairs with 3300 and 3500 monitoring systems for vibration protection. Furthermore, it suits steam turbines, compressors, and large motors. Consequently, plant operators gain continuous insight into machine health conditions.