Bently Nevada 190501 CT Velomitor

Fits cooling-tower and air-cooled heat-exchanger fan casing vibration where a low-frequency integrating piezo-velocity transducer is specified — 3.94 mV/mm/s (100 mV/in/s), 3.0–900 Hz (±1 dB), for fans ≥90 rpm.

Key advantages

Range / sensitivity — Velocity range 63.5 mm/s pk (2.5 in/s pk); Sensitivity 3.94 mV/mm/s (100 mV/in/s) ±5%; amplitude linearity ±2% to 63.5 mm/s pk.
Frequency — 3.0–900 Hz ±1.0 dB; 1.5 Hz–1.0 kHz ±3.0 dB.
Duty — Low-frequency integrating piezo-velocity transducer (Velomitor CT) for cooling-tower / ACHX fans ≥90 rpm.
Construction — 316L stainless steel; Hermetic case; humidity to 100% condensing, non-submerged.
Mount / cable — Stud mount; mounting surface Ø33 mm; height 82 mm; torque 4.5 N·m ±0.6 N·m; max cable max cable 305 m (1000 ft).

Typical applications

Cooling-tower fan casing vibration (≥90 rpm) with Velomitor CT response.
Air-cooled heat-exchanger (ACHX) fan monitoring on 316L stud-mounted sensors.
Low-frequency velocity loops needing 1.5 Hz…1.0 kHz (±3 dB) bandwidth.
IEPE-style piezo-velocity points with 2-pin MIL-C-5015 top connector.

Selection guide

Sensitivity — 3.94 mV/mm/s (100 mV/in/s) ±5%; amplitude linearity ±2% to 63.5 mm/s pk.
Temperature — Operating Operating −40 to +85 °C; storage −40 to +100 °C.
Connector — 2-pin MIL-C-5015 top connector; max cable 305 m (1000 ft).
Mounting torque — 4.5 N·m ±0.6 N·m; mounting surface Ø33 mm; height 82 mm.
Approvals — Hazardous-area options per OEM datasheet / Approvals Quick Reference — state area classification on RFQ.

Common mistakes

Using CT Velomitor on high-speed turbomachinery casing points that need Velomitor XA bandwidth — CT is optimized for ≥90 rpm cooling-tower/ACHX fans.
Exceeding 63.5 mm/s pk range or ignoring ±2% linearity limit.
Wrong mount torque — OEM lists 4.5 N·m ±0.6 N·m.
Assuming submersible IP — hermetic case, humidity to 100% condensing, non-submerged.

When to RFQ / what to tell us

Machine type (cooling-tower / ACHX fan rpm), expected velocity, and frequency band need.
Cable length (to 305 m), connector/mate, hazardous-area approval need.
Quantity, ship-to, mounting stud/adapter details.

Request a Quote · Get selection help

Specs

Spec	Value
SKU	44335
Brand	Bently Nevada
Model	190501 CT Velomitor
Product type	velocity_sensor
Measuring Range	Velocity range 63.5 mm/s pk (2.5 in/s pk)
Accuracy	Sensitivity 3.94 mV/mm/s (100 mV/in/s) ±5%; amplitude linearity ±2% to 63.5 mm/s pk
Output Signal	Piezo-velocity voltage output; bias 10.1 Vdc ±1.0 Vdc (Pin A to Pin B)
Supply Voltage	Constant-current IEPE-style piezo-velocity excitation per Bently Velomitor family practice (see OEM DS 141636)
Ip Rating	Hermetic case; humidity to 100% condensing, non-submerged
Ambient Temperature	Operating −40 to +85 °C; storage −40 to +100 °C
Sensor Type	Low-frequency integrating piezo-velocity transducer (Velomitor CT) for cooling-tower / ACHX fans ≥90 rpm
Frequency Response	3.0–900 Hz ±1.0 dB; 1.5 Hz–1.0 kHz ±3.0 dB
Shock	5000 g pk max
Case Material	316L stainless steel
Electrical Connection	2-pin MIL-C-5015 top connector; max cable 305 m (1000 ft)
Mounting	Stud mount; mounting surface Ø33 mm; height 82 mm; torque 4.5 N·m ±0.6 N·m
Approvals	Hazardous-area options per OEM datasheet / Approvals Quick Reference
Notes	OEM Bently Nevada / Baker Hughes DS 141636 Rev. AF.

Documents

Bently Nevada 190501 Velomitor CT datasheet (PDF)

FAQ

Q: CT vs XA Velomitor? A: 190501 CT is for cooling-tower/ACHX fans ≥90 rpm (3–900 Hz ±1 dB). 330525 XA is the ruggedized broader-band sensor (−55…+121 °C, 4.5–2000 Hz ±3 dB) for harsh/outdoor mounts.

Q: What is the sensitivity? A: 3.94 mV/mm/s (100 mV/in/s) ±5% with bias 10.1 Vdc ±1.0 Vdc (Pin A to Pin B).

Q: What should I send for a quote? A: Fan rpm/duty, velocity, cable length, Ex need, quantity. Compatible with systems using Bently Nevada 190501 CT — we do not claim authorized-dealer status.