Sense machine velocity
The mounting base transfers casing motion to the piezoelectric element, which produces an electrical response proportional to vibration.
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Product Information
Bently Nevada 190501-21-00-01 is a Velomitor CT low-frequency velocity transducer that combines a piezoelectric sensing element and signal-conditioning electronics in one sealed housing. Mounted to a machine surface, it converts casing velocity into the constant-current powered voltage signal used by a compatible vibration monitor.
Mechanical motion enters Bently Nevada 190501-21-00-01 through the threaded mounting interface and loads the internal sensing element. The electronics establish the bias point and scale the response, while the MIL-C-5015 connection carries both excitation and the dynamic signal over the same two-wire path.
The 21 order field on Bently Nevada 190501-21-00-01 specifies the 3/8-24 to 1/2-14 NPT adapter, and the approval field identifies the certified execution. Mounting flatness, adapter seating and cable strain directly affect how machine motion reaches the transducer body and how the monitor receives the conditioned signal.
02
Technical Data
| Technical Item | Specification |
|---|---|
| Brand | Bently Nevada |
| Model | 190501-21-00-01 |
| Product Name | Velomitor CT low-frequency velocity transducer |
| Country | United States |
| Mounting adapter | 21 = 3/8-24 to 1/2-14 NPT |
| Connection option | 00 = MIL-C-5015 interface |
| Approval option | 01 = certified hazardous-area execution |
| Sensitivity | 3.94 mV/mm/s (100 mV/in/s) |
| Frequency response | 3 to 900 Hz, ±1 dB |
| Amplitude range | 63.5 mm/s peak (2.5 in/s peak) |
| Bias voltage | 10.1 V DC nominal |
| Output impedance | Less than 400 Ω |
| Mounting torque | See adapter and mounting-thread requirement |
| Maximum body diameter | 35.6 mm |
| Typical mass | Less than 297 g |
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Product Functions
Bently Nevada 190501-21-00-01 converts low-frequency casing motion into a monitor-ready velocity signal inside the transducer body.
Condition the response
Integrated electronics establish the bias and scale the sensor output to the specified velocity sensitivity before the signal leaves the housing.
Share power and signal
The two-wire constant-current interface supplies the electronics and returns the dynamic voltage to the monitoring channel over the same cable pair.
04
Typical Applications
Bently Nevada 190501-21-00-01 is intended for low-frequency casing-velocity measurements on slow fan assemblies where the bearing housing transmits rotor vibration to the sensor mounting point.
Cooling-tower fan assemblies
The low-frequency response covers cooling-tower fan trains operating at or above 90 rpm, including the common 100 to 300 rpm range.
Air-cooled heat-exchanger fans
Mounted on the bearing housing or casing, the transducer measures the vibration velocity carried through the fan structure.
Motor and speed-reducer components
The same measurement path captures vibration frequencies produced by the fan motor and speed reducer in addition to the low-frequency fan motion.
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Product Questions
01Why does Bently Nevada 190501-21-00-01 show bias voltage but no vibration?
Bently Nevada 190501-21-00-01 can maintain its bias when the two-wire loop is powered even if the machine is stationary or the mounting path is not transmitting motion. Check the operating condition, mounting surface and dynamic channel setup.
02What should be checked if Bently Nevada 190501-21-00-01 reads high at low frequency?
For Bently Nevada 190501-21-00-01, inspect mounting flatness, adapter tightness, cable movement and nearby structural resonance before changing monitor scaling.
03Can Bently Nevada 190501-21-00-01 use an ordinary voltage input?
Bently Nevada 190501-21-00-01 requires a compatible constant-current powered two-wire input that can read the bias-centered dynamic signal; a passive voltage input does not provide the required excitation.
04How does the 21 adapter code affect Bently Nevada 190501-21-00-01?
The 21 code on Bently Nevada 190501-21-00-01 provides the documented 3/8-24 to 1/2-14 NPT mounting transition, so the machine-side thread and seating surface must suit that adapter.
05Why is cable strain important for Bently Nevada 190501-21-00-01?
Cable force on Bently Nevada 190501-21-00-01 can load the connector or transducer body and introduce motion unrelated to the machine; support the cable without pulling on the MIL-C-5015 connection.
06What confirms correct polarity on Bently Nevada 190501-21-00-01?
With Bently Nevada 190501-21-00-01 connected to the compatible monitor, verify the documented bias voltage and a stable dynamic response; incorrect or open wiring will not produce the normal bias-centered signal.
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Customer Support
Moore Automation
https://www.mvme.cn/Moore Automation records the full manufacturer, exact model and requested quantity for industrial automation enquiries.
Supporting nameplate photographs, destination details and technical notes can remain with the same enquiry so the requested hardware is reviewed consistently.
Model recordExact identifier retained
Supporting factsImages and notes attached
Reply continuityCommercial facts remain linked
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