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Spécifications and Ordering Information
330450
High Température Accélération System
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The standard 330400 Accelerometer has a limited température 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 +121°C (+250°F).
The 330450 High Temperature Acceleration System (HTAS) has a fundamentally different construction to solve this problem. Its design
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segregates the sensing element from the signal conditioning electronics, with the two permanently connected via a hardline cable. Current versions (see note below) ofthese 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 transducerfailures (connector problems) is eliminated.
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/■\Caution
If housing measurements are being made for overall protection of the machine, thought should be given to the usefulness ofthe measurementfor each application. Most common machine malfunctions (imbalance, misalignment, etc.) originate at the rotor and cause an increase (or at least a change) in rotor vibration. In order for any housing measurement alone to be effective for overall machine protection, a significant amount of rotor vibration must be faithfully transmitted to the bearing housing or machine casing, or more specifically, to the mounting location ofthe transducer.
In addition, care should be exercised in the physical installation ofthe transducer. Improper installation can result in a degradation of the transducer's performance, and/or the generation of signals which do not represent actual machine vibration.
Upon request, Bently Nevada can provide engineering services to determine the appropriateness of housing measurements for the machine in question and/or to provide installation assistance.
Note: The previous version limited the sensor head to+300°C (+572°F). The currentversions will have the letter"G" preceding the serial number.
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FOR REFERENCE ONLY
REFER TO DOCUMENT #169885
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