The Bently Nevada 74712 is the high-temperature version of the 9200 two-wire moving-coil Seismoprobe velocity transducer. It generates a voltage proportional to vibration velocity for absolute, free-space-referenced vibration measurement.
Part-number configuration: option 03 specifies 90-degree orientation and a 4.5 Hz minimum operating frequency; option 11 specifies an isolated circular M10 x 1 mounting base; option 02 specifies a top connector; option 00 specifies no agency approvals.
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High-temperature design
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Official operating and storage range: -29 to +204 degrees C.
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Two-wire output
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Moving-coil velocity output; no external excitation power is required.
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Configured orientation
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90 degrees, within the official orientation tolerance.
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Minimum frequency
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4.5 Hz (270 cpm) for ordering option 03.
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Sensitivity
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20 mV/mm/s (500 mV/in/s), +/-5% under official calibration conditions.
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Environmental resistance
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Dust and moisture resistant; up to 95% relative humidity, noncondensing.
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Measurement: converts mechanical motion of the seismic mass into an electrical signal proportional to vibration velocity.
Reference: measures absolute motion relative to free space rather than relative shaft motion.
Signal path: output is taken across terminals A and B with the specified termination.
Installation role: supports casing, bearing-housing and structural vibration monitoring where the verified environment matches the official limits.
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Frequency response
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4.5 to 1000 Hz, +0/-3 dB typical.
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Calibration load
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10 kohm across terminals A and B.
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Displacement limit
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2.54 mm peak-to-peak maximum.
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Velocity reference
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25 mm/s at +22 degrees C, 100 Hz and 10 kohm load.
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Coil resistance
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1.25 kohm, +/-5%.
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Locked-coil inductance
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125 mH typical.
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Amplitude linearity
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+/-5% from 0.254 to 127 mm/s at 100 Hz.
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Shock resistance
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50 g peak.
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Maximum lead length
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305 m.
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The Seismoprobe uses a moving-coil seismic mechanism. Relative motion between the internal seismic mass and coil assembly induces a voltage. Within the documented operating band, the output voltage is proportional to vibration velocity.
The transducer is self-generating, so it does not require an external power supply. Correct orientation, termination and mounting are necessary to retain the documented response.
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Mounting interface
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Isolated circular M10 x 1 base.
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Connector position
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Top mount.
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Case and adapter
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Anodized aluminum A204.
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Gasket
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Silicone.
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Connector materials
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Cadmium-plated aluminum, neoprene and silver-plated copper.
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Typical dimensions
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41 mm diameter; approximately 102 mm height depending on connector.
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Typical weight
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480 g.
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Humidity and altitude
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95% RH noncondensing; 2000 m maximum.
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Approval option
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00 means no agency approvals. Confirm site requirements.
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General compliance
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FCC Part 15, EMC 2014/30/EU / EN 61326-1, RoHS 2011/65/EU and China RoHS are listed in the official datasheet.
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Is physical stock confirmed? Confirm before quotation.
Is the unit new, used or refurbished? Subject to verification.
Can current product and nameplate photographs be supplied? Available on request.
What warranty applies? Available on request and stated in the quotation.
What is the dispatch time? Confirm before quotation.
Has the unit been tested? Test status and scope are subject to verification.
Which payment methods are accepted? Available on request and stated in the proforma invoice.
How quickly is a quotation issued? Response timing is subject to configuration and availability verification.
How is the transaction documented? Request an itemized quotation, company details, invoice, current photographs and available shipment records.
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EN
