Bently Nevada 26862-02-30 Velocity Seismoprobe Product Specification
26862-02-30 is an original factory calibrated velocity-type seismic vibration sensor manufactured by Bently Nevada, dedicated for casing absolute vibration measurement of large rotating machinery including steam turbines, centrifugal compressors, heavy-duty blowers and large electric motors within power, petrochemical and metallurgical industries. Classified as Seismoprobe velocity transducer, it directly measures absolute casing vibration velocity based on inertial seismic working principle, converting mechanical vibration displacement and velocity into proportional standard analog electrical signal for subsequent 3300 or 3500 series rack monitoring modules collection, real-time vibration alarm setup and machinery protection interlock control. Every finished transducer undergoes full factory linearity calibration, high-low temperature cycling aging test, mechanical shock and continuous vibration endurance inspection before factory delivery to guarantee stable measuring performance under harsh cabinet and equipment surface installation environments with temperature fluctuation, oil mist and electromagnetic interference. Its applicable effective working speed range covers 270 to 60000 CPM, matching most mainstream industrial rotating equipment operating rotational speed requirements.
Description
Bently Nevada 26862-02-30 Velocity Seismoprobe Product Specification
1. Product Overview
26862-02-30 is an original factory calibrated velocity-type seismic vibration sensor manufactured by Bently Nevada, dedicated for casing absolute vibration measurement of large rotating machinery including steam turbines, centrifugal compressors, heavy-duty blowers and large electric motors within power, petrochemical and metallurgical industries. Classified as Seismoprobe velocity transducer, it directly measures absolute casing vibration velocity based on inertial seismic working principle, converting mechanical vibration displacement and velocity into proportional standard analog electrical signal for subsequent 3300 or 3500 series rack monitoring modules collection, real-time vibration alarm setup and machinery protection interlock control. Every finished transducer undergoes full factory linearity calibration, high-low temperature cycling aging test, mechanical shock and continuous vibration endurance inspection before factory delivery to guarantee stable measuring performance under harsh cabinet and equipment surface installation environments with temperature fluctuation, oil mist and electromagnetic interference. Its applicable effective working speed range covers 270 to 60000 CPM, matching most mainstream industrial rotating equipment operating rotational speed requirements.
2. Part Number Definition Breakdown
The coding segments of 26862-02-30 correspond to fixed factory configuration parameters respectively. 26862 stands for base model series of Bently standard seismic velocity seismoprobe transducer; the middle digit 02 defines internal coil winding specification, built-in damping parameter and default factory sensitivity grade; the suffix 30 specifies integrated outgoing cable length, terminal connector form and outer shell sealing structure standard. All internal circuit and mechanical matching parameters are solidified via original factory calibration, random replacement of non-specified extension cable or mismatched substitute sensor will damage measurement linearity and lead to inaccurate vibration data output.
3. Core Functional Characteristics
Operating on inertial seismic induction principle without needing external preamplifier matching like eddy current proximity probes, this seismoprobe directly picks up absolute vibration velocity from equipment casing surface via internal inertial mass-spring structure, eliminating measurement error caused by shaft relative displacement variation. Primary application scenarios include long-term online casing vibration monitoring of rolling bearing supported rotating equipment, early mechanical fault identification for loose base, bearing damage and gear meshing abnormality. Fully encapsulated metal housing with epoxy inner filling delivers outstanding oil-proof, moisture-proof and dust-proof capability to adapt installation on equipment outer casing near lubrication oil chambers. The output analog signal can be directly accessed into Bently standard vibration monitor rack channels for threshold configuration of pre-alarm and emergency trip protection to avoid catastrophic unit breakdown triggered by excessive casing vibration.
4. Electrical and Metrological Specifications
The transducer works with standard low voltage power supply from matching rack monitoring card, featuring fixed factory preset velocity sensitivity and defined effective linear vibration measuring range corresponding to 270–60000 CPM working frequency band. Internal shielding structure effectively suppresses external alternating electromagnetic interference from nearby high voltage cables and power frequency equipment to reduce signal distortion during transmission. Integral shielded outgoing cable adopts double-layer shielding design to stabilize signal transmission performance; output signal polarity and impedance parameter comply with universal Bently seismic sensor interface standard for seamless connection with original series monitoring modules. Any field wiring modification or cable cutting will invalidate original factory calibration parameters and affect measurement precision.
5. Environmental Working Parameters
Continuous allowable operating ambient temperature of the seismoprobe ranges from -45°C up to +121°C to fit high-temperature installation on hot equipment casing surface; spare part storage temperature is controlled between -50°C and +85°C under dry non-condensing ambient condition with applicable relative humidity ranging 5%RH~93%RH, dew condensation on transducer shell and internal component is strictly prohibited to prevent insulation degradation and internal short circuit fault. The unit can withstand regular industrial field vibration within 8Hz~2kHz from adjacent running equipment; installation location should avoid persistent corrosive gas immersion and direct high-temperature flame radiation to extend internal inertial assembly service life. For installation at altitude over 1200 meters, shorten quarterly routine inspection cycle properly.
6. Installation and Routine Maintenance Guidance
The seismoprobe body is equipped with standard fixed mounting base hole for rigid bolt fastening onto cleaned flat equipment casing surface, and installation position shall be selected at casing main vibration transmission node to capture accurate vibration source signal. During periodic equipment maintenance, regularly check mounting bolt tightening status, outer shell surface corrosion condition and outgoing cable sheath integrity to eliminate hidden trouble of intermittent signal drop caused by loose fixing or cable cracking. When field replacement is required, only spare transducer with identical part number 26862-02-30 is allowed for direct swap, different suffix specification seismoprobes cannot be cross-used without professional recalibration. All replacement finished products pass full electrical performance test and alternating temperature aging screening before factory outbound to guarantee complete on-site interchangeability.
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