The Bently Nevada 330500-03-04 Velomitor Piezo-velocity Sensor provides direct velocity output for industrial vibration monitoring. You do not need any external integrator for this sensor. Its 316L stainless steel case offers excellent protection in harsh environments. Additionally, the 330500 series sensor works perfectly on turbines, compressors, pumps, and cooling towers. This specific model features a 1/4-28 UNF mounting thread and multiple hazardous area approvals.
All electrical parameters are specified from +20°C to +30°C at 100 Hz. Operating the transducer outside the specified limits may result in false readings or loss of machine monitoring.
Sensitivity
The sensor offers a fixed sensitivity of 3.94 mV/mm/s (100 mV/in/s) ±5%. Therefore, you get reliable and repeatable velocity measurements across all applications.
Frequency Response
The 330500-03-04 covers a wide frequency range. First, it operates from 4.5 Hz to 5 kHz (270 cpm to 300 kcpm) ±3.0 dB. For critical monitoring, use the tighter range of 6.0 Hz to 2.5 kHz (360 cpm to 150 kcpm) ±0.9 dB.
Velocity Range and Linearity
Maximum measurable velocity reaches 1270 mm/s (50 in/s) peak. Amplitude linearity stays within ±2% up to 152 mm/s (6 in/s) peak. Consequently, this sensor provides accurate readings across most machinery vibrations.
Output Bias and Impedance
Output bias voltage measures -12 ±3.0 VDC referenced to Pin A. Dynamic output impedance is less than 2400 Ω. Hence, the sensor works well with long cable runs.
Noise Floor and Transverse Sensitivity
Broadband noise floor (4.5 Hz to 5 kHz) is only 0.004 mm/s (160 μin/s) rms nominal. Additionally, transverse sensitivity remains less than 5% of the main sensitivity.
The Bently Nevada 330500-03-04 handles extreme industrial conditions without any failure.
Temperature Range
Operating temperature spans from -55°C to 121°C (-67°F to 250°F). Therefore, this sensor suits both outdoor installations and high-temperature machinery.
Shock and Humidity
Shock survivability reaches 5,000 g peak maximum. Relative humidity can reach 100% non-submerged because the case is hermetically-sealed.
Temperature Sensitivity and Base Strain
Temperature sensitivity varies typically from -14% to +7.5% over the full operating range. Base strain sensitivity is only 0.005 in/s/mstrain.
Weight is 142 grams (5.0 oz) typical. Diameter measures 25.3 mm (0.995 in). Height is 63.2 mm (2.49 in). The case uses 316L stainless steel for maximum corrosion resistance. Connector type is a 2-pin Mil-C-5015 hermetically-sealed shell with 316L stainless steel.
This specific model, 330500-03-04, includes the -03 mounting thread option. This means it has a 1/4-28 UNF thread. No adapter is needed for standard UNF mounting holes. Always apply the correct mounting torque of 32-46 kg cm (24-40 in-lb) max.
Pay close attention to polarity during installation. When the sensor case moves toward the connector, Pin A becomes positive with respect to Pin B. The sensor features case isolation. Therefore, you can ground the case separately if ground loops are a concern.
Maximum cable length reaches 305 metres (1,000 feet) using part number 02173006. For a high vibration scenario (50g, 10 kHz, 200 pf/m cable capacitance), the recommended cable length is 208 ft (63m). Longer cables may degrade the signal quality.
The 330500-03-04 includes the -04 approval option, which provides multiple approvals (CSA and ATEX). Specifically, it holds:
Ex ia IIC T4 and AEx ia IIC T4 for intrinsic safety applications
Class I, Division 1, Groups A, B, C and D for North American hazardous locations
Class II, Groups E, F, G and Class III for combustible dusts
Ex nL IIC T4 and AEx nA IIC T4 for Zone 2 / Division 2
Class I, Div 2, Groups A, B, C, D for non-incendive installations
Temperature class T4 from -40°C ≤ Ta ≤ 100°C
Install this sensor per drawing 167537 for all hazardous area applications.
The sensor complies with FCC Part 15 rules. It also meets EMC Directive 2014/30/EU and RoHS Directive 2011/65/EU. Maritime approvals include DNV rules for ships, high-speed craft, and offshore standards.
Follow these steps for proper installation of the 330500-03-04.
Prepare a flat, clean mounting surface on the machine casing.
Apply anti-seize compound on the 1/4-28 UNF threads.
Tighten the sensor to 32-46 kg cm (24-40 in-lb). Never exceed this torque value.
Use the recommended cable length to maintain signal integrity.
Verify the polarity matches your monitoring system before power-up.
Operating the transducer outside specified limits may cause false readings. Always respect the temperature, velocity, and torque ranges.
1 x Bently Nevada 330500-03-04 Velomitor Piezo-velocity Sensor (1/4-28 UNF thread)
1 x Protective cap for the 2-pin Mil-C-5015 connector
1 x Installation instruction sheet (drawing reference 167537)
Note: Cables, mounting accessories, and calibration certificates are sold separately.
All orders ship via Fedex, UPS, or DHL. We use professional anti-static and anti-shock packaging. Delivery times depend on your destination location.
1. What approvals does the 330500-03-04 actually have?
The 330500-03-04 includes the -04 approval option, which provides multiple approvals. Specifically, it holds both CSA (Class I, Div 1) and ATEX (Ex ia IIC T4) certifications for worldwide hazardous area use.
2. What is the mounting thread on the 330500-03-04?
This model has the -03 mounting thread option, which is 1/4-28 UNF. It does not require any adapter for standard UNF mounting holes.
3. Can I use this sensor at temperatures above 100°C in a hazardous area?
No. The temperature class T4 rating requires an ambient temperature (Ta) between -40°C and 100°C. Above 100°C, the hazardous area approval becomes invalid. However, the sensor itself can operate up to 121°C in non-hazardous areas.
4. What happens if I exceed the 1270 mm/s velocity range?
Exceeding 1270 mm/s peak may cause signal clipping or false readings. Additionally, repeated over-range events could damage the internal electronics. Always keep vibrations within the specified range.
5. Is the sensor case grounded or isolated?
The case is isolated from the internal electronics. Therefore, you can ground the case separately if needed. This isolation feature helps avoid ground loops in your monitoring system.
| Brand Name | Bently Nevada |
| Model No. | 330500-03-04 |
| Product Type | Velomitor Piezo-velocity Sensor |
| hasMerchantReturnPolicy | Adjust according to reality |
| Shippingdetails | Adjust according to reality |
