Description

The 190501-19-00-04 is a Velomitor CT Velocity Transducer engineered for low-frequency vibration monitoring on cooling towers and air-cooled heat-exchanger fan assemblies. This specific configuration features a 3/8-24 to 1/4-18 NPT adapter (Option 19), a standard MIL-C-5015 connection interface (Option 00), and is certified with CSA/NRTL/C and ATEX/IECEx approvals (Option 04). This transducer is a low-frequency variant of the standard Velomitor Piezo-velocity sensor, optimized for machines operating at or above 90 rpm. It effectively measures casing vibration velocity, capturing critical data on rotor-related malfunctions such as unbalance and misalignment. The transducer should be installed on the machine casing or bearing housing to ensure accurate transmission of rotor vibration.

Features

• Designed for low-frequency applications (100 to 300 rpm typical, 90 rpm minimum)
• MIL-C-5015 connection interface for robust electrical termination
• 3/8-24 to 1/4-18 NPT mounting adapter for versatile installation
• Certified for hazardous area use (CSA/NRTL/C Class I, Division 1 and ATEX/IECEx Class I, Zone 0/1)
• 316L stainless steel housing for environmental durability
• Broad operating temperature range from -40 degC to +85 degC
• Internal electronics isolated from case to prevent ground loops

Applications

• Cooling tower fan assemblies
• Air-cooled heat exchangers
• Low-speed rotating machinery vibration monitoring
• Casing vibration measurement for machine protection

Ordering Information

Option	Code on This SKU	Description
Orderable Part Number	190501-19-00-04	Velomitor CT Velocity Transducer
A - Mounting Hardware	19	Adapter, 3/8-in 24 to 1/4-in 18 NPT
B - Connection Option	00	MIL-C-5015 connection interface
C - Agency Approval	04	CSA/NRTL/C (Class I, Div 1), ATEX/IECEX/CSA (Class I, Zone 0/1)

Technical Specifications

Manufacturer	Bently Nevada (Baker Hughes)
Part Number	190501-19-00-04
Sensitivity	3.94 mV/mm/s (100 mV/in/s) +/- 5 percent
Frequency Response	3.0 Hz to 900 Hz +/- 1.0 dB; 1.5 Hz to 1.0 kHz +/- 3.0 dB
Velocity Range	63.5 mm/s peak (2.5 in/s peak)
Operating Temperature	-40 degC to +85 degC (-40 degF to +185 degF)
Case Material	316L stainless steel
Weight	<297 g (10.5 oz)
Height	82 mm (3.2 in)
Mounting Surface	33 mm (1.3 in) diameter
Connector	2-pin 316L stainless steel MIL-C-5015

Installation Guidelines

• Install on bearing housing or machine casing; avoid improper mounting which can decrease frequency response or generate false signals.
• Mounting torque: 4.5 N-m +/- 0.6 N-m (40 in-lbf +/- 5 in-lbf).
• Ensure installation complies with entity parameters for hazardous area approvals (Drawing 167536).
• Cable: Use shielded, twisted pair cable; maximum length 219 m (720 ft) recommended (contact technical support for longer runs).

Compliance and Certifications

• CE Directive 2014/30/EU (EMC)
• RoHS Directive 2011/65/EU
• ATEX/IECEx: Ex ia IIC T3 Ga / Ex ec IIC T3 Gc
• CSA/NRTL/C: Class I, Division 1, Groups A, B, C, D; Class II, Group E, F and G; Class III