330750 and 330752 High Temperature Velomitor * System Datasheet PDF Manual Download

Velomitor Piezo-Velocity Sensor Specifications:*

Standard 330500 Velomitor* Piezo-Velocity Sensor:
- Maximum Operating Temperature: +121°C (+250°F) due to signal conditioning electronics being located in the same case as the sensing element.
High Temperature Velomitor System (HTVS) 330750 and 330752:
- Construction: Sensing element and signal conditioning electronics are segregated, connected via a hardline cable.
- Maximum Sensing Head Temperature: +400°C (+752°F).
- Advantages: Eliminates potential transducer failures from connector problems.
- Overall Transducer System Performance: Comparable to other Velomitor transducers but permits use at significantly higher temperatures.

Table of Contents

Housing measurements for overall machine protection may not be effective in all cases, as common machine malfunctions often originate at the rotor.
Proper physical installation of the transducer is essential to maintain its performance and ensure accurate machine vibration monitoring.
Bently Nevada can provide engineering services and installation assistance upon request.

Sensitivity: 5.7 mV/mm/s (145 mV/in/s) ±5%
Frequency Response:
- 15 to 2000 Hz (900 to 120,000 cpm) ±3.0 dB
- 20 to 1000 Hz (1,200 to 60,000 cpm) ±0.9 dB
Transient Temperature Sensitivity: 0.0762 mm/s/°C (0.003 in/s/°C), typical, as defined in ISO 5347-18:1993(E).
Amplitude Range:
- Below 680 Hz: 635 mm/s (25 in/s) peak
- Above 680 Hz: 2940 m/s2 (300 g) peak (Vibration at frequencies above 2 kHz will decrease this range.)
Transverse Sensitivity: Less than 5% of Sensitivity.
Amplitude Linearity: ±2% to 152 mm/s (6 in/s) peak.
Mounted Resonant Frequency: Greater than 5 kHz.
Broadband Noise Floor (15Hz to 2kHz): 0.127 mm/s (0.005 in/s) rms nominal.
Maximum Cable Length: 305 meters (1000 feet) with no degradation of signal.

North America:
- CSA/US/C certified for hazardous areas.
- Class I, Div I, Groups A, B, C, and D.
- Class II, Div I, Groups E, F, and G.
- Class III, Div I.
- Ex ia IIC, AEx ia IIC, T4 @ Ta = 100°C when installed with an approved zener barrier per BN drawing 168077.
- Ex nL IIC; Class I, Zone 2, Class I, Div 2, Groups A, B, C, D when installed per BN drawing 168077.
Europe/ATEX:
- II 1 G Ex ia IIC T4, T4 @ Ta = -40°C – 100°C.
- II 3 G Ex nA IIC T4, T4 @ Ta = -40°C – 100°C.

Note: Current versions of the High-Temperature Velomitor System have the letter “G” preceding the serial number.

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