330878-91-05 Bently Nevada Proximity Sensor
Description
The 330878-91-05 is part of the Bently Nevada “3300 XL” (or similar) Proximity/Proximitor sensor family, designed for non-contact displacement (gap) measurement
of conductive targets (e.g., shafts, collars) in rotating machinery.Specifically, the “3300 XL 50 mm” transducer system is often referenced for
the 330878 series. The datasheet describes a system consisting of: a probe (50 mm / some range), extension cable, and the Proximitor
(signal conditioning) sensor module. The table of suffix codes (e.g., “-91-05”) typically encodes length/mounting
option (“91” = 9.0 m system length with DIN-rail mount) and approval
option (“05” = multiple approvals) for that series.
330878-91-05 Details
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FAQ
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Q1: What exactly does the 330878-91-05 measure?
A1: It measures the gap between the probe tip and a conductive target (e.g., shaft, collar). That gap changes as the rotor moves, vibrates, expands, or displaces. The sensor outputs a voltage proportional to that gap/displacement.
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Q2: How linear and how far is its measurement range?
A2: For the 50 mm coil version (which the 330878 series belongs to) the maximum linear range is up to ~27.9 mm (1.1 in). The output is ~0.394 V/mm for that range.Note: the usable “linear” portion might be less depending on installation, target size, cable length, ambient conditions.
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Q3: What is the power supply and wiring requirement?
A3: Typical Proximitor sensors require a negative DC supply (e.g., -17.5 Vdc to -26 Vdc) and a load resistor of 10 kΩ, for the 50 mm version. Field wiring: shielded triad cable recommended, cable capacitance/inductance must meet spec to maintain performance.
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Q4: Can I extend the cable length?
A4: Yes, but within limits: for example, the datasheet mentions a maximum cable+probe length of up to ~9 m for the system length (depending version) and cable capacitance/inductance loads must remain under specified values to maintain hazardous-area certification. Longer lengths possible but performance (frequency response, accuracy) may degrade if spec >305 m cable or improper cable type.
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Inquiry now: miya@mvme.cn
Bently Nevada Hot Series:
- 3300 XL Proximity Probe
- 3300 Proximitor Sensor
- 3500 Power Supply
- 1900/65A
- 3500/42 Monitor Module
- The 990 Vibration Transmitter
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