190501-04-00-00 is a Bently Nevada Velomitor CT velocity transducer featuring a piezoelectric-velocity sensor design. Fully compatible with metric M6x1 mounting requirements, this unit works seamlessly with cooling tower fan assemblies to deliver low-frequency casing vibration measurements and stable machine protection down to 90 rpm.
Specifications
Mounting Hardware Option：Stud M6x1 with 3/8-in 24 adapter
Connection Option：MIL-C-5015 connection interface
Agency Approval Option：No Approvals
Application
- Power generation: Monitors vibration in turbines and generators for safe operation.
- Oil & gas: Detects faults in pumps and compressors in harsh environments.
- Manufacturing: Supports predictive maintenance in rotating machinery systems.
- Mining & metals: Ensures reliability of crushers, mills, and heavy equipment.
- Marine & industrial systems: Tracks vibration in engines and propulsion systems.
Specific Application
- Casing vibration velocity monitoring on low-speed cooling tower and air-cooled heat-exchanger fan assemblies typically operating between 100 to 300 rpm.
- Rotor unbalance and structural misalignment tracking through machine housings where continuous vibration transmission occurs.
- Industrial fan system monitoring requiring an orientation-independent sensor with an exact metric M6x1 mounting stud footprint.
System Compatibility & Alternative Models
- System Compatibility: Fully compatible with Bently Nevada 3500/42M or 3500/44M monitor modules, CB2W100 2-wire shielded interconnect cables, and monitoring systems integrated with System 1 asset management software platforms.
- Alternative Model: 190501-04-00-01
- Key Differences: The 190501-04-00-00 contains an Agency Approval option code of 00, classifying it strictly for general-purpose/unclassified industrial environments with zero hazardous location ratings. In contrast, the 190501-04-00-01 utilizes option code 01, granting hazardous area certifications from CSA, NRTL, ATEX, and IECEx for intrinsic safety installation parameters.
Installation & Troubleshooting FAQ
Q1: What is the correct mounting torque required when setting up the 190501-04-00-00 transducer?
A: During field installation on the bearing housing or machine casing, you must tighten the transducer to a mounting torque of exactly 4.5 N·m ± 0.6 N·m (40 in·lbf ± 5 in·lbf). Overtightening can structurally fracture the internal crystal elements, while loose installation decreases the transducer's amplitude and high-frequency response capabilities.
Q2: What is the standard output bias voltage and how do I verify sensor health during operation?
A: The standard output bias voltage for a functional Velomitor CT sensor is 10.1 Vdc ± 1.0 Vdc, measured with Pin A referenced to Pin B. If your monitoring rack registers an open or short circuit, verify this voltage profile at the terminal housing using a digital multimeter to isolate a damaged leading cable from a core transducer failure.
Q3: How does the mounting angle orientation affect the velocity signal accuracy?
A: This transducer supports installation at any mounting angle or orientation without sacrificing performance. However, because the sensor's internal piezoelectric design provides a transverse response of less than 5% of its axial sensitivity, you must align the main body axis directly parallel with the direction of the machine's primary vibration forces.
Accessories
| 128608-02 | 1/2-in NPT conduit adapter |
| 04284020- 01 | Adhesive mount base kit. The adhesive mount base kit design is for machines with thin casings that do not permit drilling and tapping a mounting hole. Kit contains material (adhesive and bases) for 2 each 3/8-in 24 UNF adhesivemount bases. One kit can outfit 2 Velomitor CT Transducers. |
Spare Mounting Adapters
All mounting adapters are made from 300 series stainless steel.
Standard Studs
| 04365657 | 3/8-in 24 to 3/8-in 24 stud |
| 87910-01 | 3/8-in 24 to 1/2-in 20 stud |
| 87931-01 | M6x1 to M6x1 metric stud (requires metric adapter) |
| 87055-01 | 3/8-in 24 to M6x1 metric adapter |
| 89139-01 |
3/8-in 24 to 1/4-in 28 stud |
Hex Plate Studs
| 107756-01 | 3/8-in 24 to 3/8-in 24 plate stud |
| 107755-01 | 3/8-in 24 to 1/2-in 20 plate stud |
| 107754-01 | 3/8-in 24 to 1/4-in NPT plate stud |
| 107757-01 | M6x1 to M6x1 plate stud (requires metric adapter) |
| 125094-01 | 3/8-in 24 to M8x1 metric plate stud |
| 128038-01 | 3/8-in 24 to 1/4-in 28 Plate Stud |
Quick Disconnect Components
The following three components are included with the quick disconnect mounting option for the Velomitor CT Transducer. The quick disconnect option allows you to remove the transducer without rotating it, allowing you to keep the cable connected to the transducer.
| 128689-01 | 3/8-in 24 to 1¾-in 16 quick disconnect stud base. Attached to the machine. |
| 43055-01 | 1¾-in 16 mounting base nut. Interface between stud base and transducer piece. |
| 128690-01 | 3/8-in 24 quick disconnect stud transducer piece. Attached to the Velomitor CT Transducer. |
Fittings
Conduit fittings allow connection of flexible, metal, liquid-tight conduit or armor to the conduit adapter.
| 0383920 | 1/2-in NPT straight male conduit fitting. For connecting flexible, liquid-tight conduit to the conduit adapter or a weatherproof enclosure. |
| 03850000 | 1/2-in NPT straight, male compression-type fitting. For connecting Teflon™-coated 3/8-in stainless steel armor to the transducer or a weatherproof enclosure. Fitting will fit Teflon™-coated armor with a maximum outer diameter of 13.8 mm (0.543 in) (including Teflon™ thickness). |
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