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Manufacturer : Bently Nevada

Product No.: 330450-20

Product type : High Temperature Acceleration System

Sensitivity: 10.2 mV/m/s² (100 mV/g) ±5%

Acceleration Range: 785 m/s² (80 g) peak overall acceleration within the 15 to 10000 Hz frequency span

Amplitude Linearity: ±2% to 785 m/s² (80 g) peak

Broadband Noise Floor: 0.059 m/s² (0.006 g) rms (10 Hz to 15 kHz)

Frequency Response: 15 to 10000 Hz (900 to 600,000 cpm) ±3 dB; 40 to 4000 Hz (2400 to 240,000 cpm) ±5%

Transverse Sensitivity: Less than 5% of axial

Mounted Resonant Frequency: Greater than 15 kHz

Maximum Cable Length: 305 meters (1000 ft) with no degradation of signal

Input Voltage: -24 ± 0.5 Vdc

Bias Current: 2 mA nominal

Output Bias Voltage: -12 ± 0.5 Vdc

Grounding: Case isolated

The standard 330400 Accelerometer has a limited temperature range it can be exposed to, due to its signal conditioning electronics being located in the same case as the sensing element.  Temperature limitations of the electronics limit its maximum operating temperature to +100°C (+212°F).

The 330450 High Temperature Acceleration System (HTAS) has a fundamentally different construction to solve this problem.  Its design segregates the sensing element from the signal conditioning electronics, with the two permanently connected via a hardline cable.  Current versions (see note below) of these sensors allow the sensing head to be mounted on surfaces with temperatures as high as +400°C (+752°F).  Due to the segregated design, the signal conditioning electronics can be installed in a cooler location.  This achieves overall transducer system performance comparable to other acceleration transducers, but permits use at significantly higher temperatures.  By eliminating connections between the sensing head and its associated signal conditioning electronics, a significant source of potential transducer failures (connector problems) is eliminated. 

Frequently Asked Questions

Q1: What is the Bently Nevada 330450-20 High Temperature Acceleration System used for?

A: The Bently Nevada 330450-20 High Temperature Acceleration System is used for vibration and acceleration monitoring in rotating machinery operating in elevated-temperature environments. 

Q2: What is the input voltage requirement of the 330450-20 system?

A: The 330450-20 system requires an input voltage of -24 ± 0.5 VDC, ensuring stable operation and consistent signal conditioning.

Q3: What is the bias current of the 330450-20 system?

A: The 330450-20 features a nominal bias current of 2 mA, supporting proper operation of the acceleration sensing circuitry.

Q4: What is the output bias voltage of the 330450-20 system?

A: The 330450-20 acceleration system provides an output bias voltage of -12 ± 0.5 VDC, which is used for signal conditioning and system operation.

Product Applications 

Power Industry: Monitoring the casing vibration of high-temperature steam pipelines, large steam turbines, generator sets, and gas turbines.

Oil and Gas Industry: Online condition monitoring of high-temperature equipment such as petrochemical plants, high-pressure compressor units, and hydrogenation reactors.

Metallurgy and Chemical Industry: Acquiring critical vibration data for equipment such as high-temperature smelting furnaces and high-temperature fans.