330425-01-05

FAQS

• What is Bently Nevada 330425-01-05?
  It is a three-wire piezoelectric acceleration transducer for critical-machinery casing vibration, with a 1/4-28 UNF stud and multiple CSA/ATEX/IECEx approvals.
• What does suffix 01 mean?
  The official ordering table defines 01 as a 1/4-28 UNF integral mounting stud.
• What does suffix 05 mean?
  It is the multiple-approvals option covering CSA, ATEX and IECEx; the exact hazardous-area installation conditions still apply.
• What is its sensitivity?
  The 330425 sensitivity is 25 mV/g ±5%, equivalent to 2.5 mV per m/s².
• What acceleration range does it measure?
  Bently Nevada specifies 75 g peak overall acceleration within the 10 Hz to 15 kHz span.
• How is 330425 different from 330400?
  330425 has 25 mV/g sensitivity and a 75 g peak range; 330400 has 100 mV/g and 50 g peak, and is the model specifically described as addressing API 670 accelerometer requirements.
• What is the frequency response?
  10 Hz to 15 kHz within ±3 dB and 30 Hz to 10 kHz within ±10%.
• What power does it require?
  It requires -24 ±0.5 Vdc, with 2 mA nominal bias current and -8.5 ±0.5 Vdc output bias.
• Where should it be mounted?
  On a properly prepared bearing housing or machine casing that transmits representative vibration, using a 32 microinch rms surface and 4.1 N·m torque.
• Which cables are documented?
  Bently Nevada lists 130539, 16925 and armored 16710 three-conductor cable families; choose the exact construction and order length for the installation.
• Can it be connected to a Bently Nevada monitor?
  Yes. Official Bently Nevada material lists 330425 for 1900/65A acceleration/reciprocating-acceleration channels and 3500/70M acceleration-related functions, subject to correct channel configuration.
• Is the sensor waterproof?
  The sensor itself is equivalent to IP68 and is hermetically sealed, but that rating does not include the cable; the official outdoor arrangement uses a protected enclosure and conduit.
• What is its operating temperature?
  The specified operating and storage range is -55 to +121 °C.
• What are the dimensions and weight?
  It is 23 mm in diameter and 59 mm high including the stud. The current datasheet states 99 g typical in one physical row and also repeats 100 g typical, so verify the current unit before logistics use.
• Can option 05 be installed directly in any hazardous area?
  No. Apply drawing 167536, the exact certificate and zone, entity parameters, associated apparatus, cable calculation, connector IP and transient-protection conditions.
• What must be checked after installation?
  Verify mounting, bias voltage, signal polarity, cable/shield integrity, 25 mV/g scaling, frequency response, noise, alarms/trips and end-to-end protection response.