330450 High-Temperature Acceleration Sensor (HTAS) - GE Energy Bently Nevada - #1

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Specifications and Ordering Information Part Number 169885-01 Rev. A (03/07) Page 1 of 10 330450 High Temperature Acceleration System Description 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 +121°C (+250°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. Caution If housing measurements are being made for overall protection of the machine, thought should be given to the usefulness of the measurement for 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 of the transducer. In addition, care should be exercised in the physical installation of the 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 current versions will have the letter “G” preceding the serial number.