330505低频速度传感器
用于水力发电，检测定子铁芯、定子机座和轴承支撑的振动；
常用型号：
330505-01-02-02；330505-02-02-02
330505-01-02-00；330505-02-02-00
330505 Low Frequency Velocity Sensor
330505低频速度传感器

Description
The Bently Nevada Low Frequency Velocity Sensor is designed to measure absolute (relative to free space) bearing housing, casing, or structural vibration. The two-wire system consists of a transducer and appropriate cable.
The Low Frequency Velocity Sensor is ideal for capturing vibration data in installations where vibration frequencies of less than 4 Hz provide valuable data. Its main use is to measure bearing casing vibrations on hydroelectric turbines where slow rotating speeds require a low signal to noise ratio. The 330505 Transducer is a two-wire design that uses moving-coil technology with embedded signal conditioning circuitry to provide a voltage output directly proportional to the transducer's vibration velocity. The 330505 Transducer connects to an interconnect cable and is then directly attached into the 3500/46M Hydro Monitor. This transducer currently does NOT interface with the Trendmaster* family of products. Additionally, due to capacitance constraints, hazardous area approvals will NOT be available on this product.

Specifications
Parameters are specified from +20 to +30°C (+68 to +86°F) and 80Hz unless otherwise indicated.

Electrical
Sensitivity:
20 mV/mm/s (508mV/in/s) ±10%

Frequency response:
0.5 to 1000 Hz (30 to 60,000 cpm) ± 3.0 dB;1 to 200 Hz (60 to 12,000 cpm) ± 0.9 dB

Amplitude range:
See vibration nomograph (Figure 1)

Amplitude linearity:
±3% to 102 mm/s (4 in/s) peak

Maximum cable length:
305 metres (1000 feet)
with no degradation of signal, when used with 3500/46M

Environmental Limits
Operating and storage temperature range
Maximum mounted surface temperature −40°C to +100°C (−40°F to +212°F)

Shock survivability:
981 m/s2 (100g) peak

Relative humidity:
To 100% non-submerged; case is hermetically sealed.
常用型号：330505-01-02-02；330505-02-02-02；330505-01-02-00；330505-02-02-00

Ordering Information
330505-AXX-BXX-CXX

A: Transducer Mounting Angle
0 1   0° ± 10°
0 2   90° ± 5°
0 3   180° ± 10°

B: Internal Mounting Thread
0 2   3/8-24 UNF-2B

C: Mounting Adapter Option
0 0   No Adapter
0 1   1/2 - 20 UNF
0 2   M8 x 1
0 3   1/4 - 28 UNF
0 4   1/4 - 20 UNC
0 5   1/4 - 18 NPT
0 6   5/8 - 18 UNF
0 7   3/8 – 16 UNC