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      991-25-70-01-00

      Thrust Transmitter
      Ships by Thursday, November 12
      Product image is representative; revision or series may vary. Contact us to request a specific version.

      Product Describe：

      Bently Nevada 991-25-70-01-00 is a two-wire axial-position transmitter with a 25–0–25 mils range and a matched 7 m 3300 NSv transducer system. It provides a 4–20 mA signal to the receiving control system.
      • Manufacturer part number
        991-25-70-01-00
      • Shipping
        Swift global dispatch
      • Condition
        New, original product
      • Shipping size (est.)
        10cm x 7.4cm x 6cm
      • Country of Origin
        USA

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      What happens after you enquire

      • 0

        Review your reference

        Send the complete Bently Nevada 991-25-70-01-00 reference, label photographs and required quantity. Include the installed NSv probe/cable arrangement and receiving-loop scale.

      • 1

        Confirm the offer

        Review the offered revision, condition, included items and documents against the confirmed installation.

      • 2

        Arrange dispatch

        Confirm quantity, dispatch date, lead-time start and delivery details in the quotation.

      • Match the complete marking

        Include the complete Bently Nevada 991-25-70-01-00 marking and any revision or assembly number visible on the item. Retain the full range, system-length, mounting and approval selections.

      • Check the offered item before ordering

        Request available label and connector photos. Have your maintenance team compare the offered 991-25-70-01-00 with the installed equipment and applicable Bently Nevada documentation.

      Technical specifications for 991-25-70-01-00

      • Manufacturer:
        Bently Nevada
      • Product Category:
        Machinery Monitoring Systems
      • Spare Part Number:
        991-25-70-01-00
      • Weight:
        0.5 kg
      • Tariff Code:
        8537101190
      • Measurement range:
        25–0–25 mils
      • Electrical system length:
        7.0 m
      • Signal output:
        4–20 mA; two-wire loop
      • Terminal supply:
        12–35 VDC
      • Loop load:
        Maximum 1000 Ω at 35 VDC
      • Current limiting:
        23 mA typical
      • TEST-input accuracy:
        ±1.5% full scale typical; 250 Ω loop
      • Not OK output:
        <3.6 mA within 100 µs
      • Signal recovery:
        Within 0.1 s
      • Diagnostic impedance:
        10 kΩ; calibrated for 10 MΩ
      • Diagnostic cable:
        Maximum 3 m at BNC output
      • Prox Out linear range:
        0.25–1.65 mm
      • Operating temperature:
        -35 to +85 °C
      • Mounting:
        35 mm DIN-rail clips
      View as PDF Ask for Quote

      Information

      Overview Downloads Applications / Compatibility Product Precautions
      • Bently Nevada 991-25-70-01-00 converts shaft thrust movement into a proportional current-loop signal while retaining a separate diagnostic gap output. The selected 25–0–25 mils scale, initial probe gap and receiving-channel direction work together to define the usable measurement.
      Thrust scale: 25–0–25 mils
      Transducer circuit: 7.0 m matched 3300 NSv system
      Mounting: 35 mm DIN-rail clips
      The selected full-scale range is 25–0–25 mils, with 35 mm din-rail clips for mounting. The transmitter includes the Proximitor function and accepts one non-contacting 3300 NSv probe with its matched extension cable. It therefore needs no additional external Proximitor Sensor in this measurement chain.

      The two-wire loop operates with 12–35 VDC at the transmitter terminals and provides 4–20 mA over the selected range. Total load is limited by the available supply voltage, with a specified maximum of 1000 Ω at 35 V. Independent zero and span adjustments support loop setup, while the TEST pin allows a variable DC input to check the loop separately from the mechanical transducer.

      The non-isolated PROX OUT diagnostic signal has 10 kΩ output impedance and is calibrated for a 10 MΩ load. A 122115-01 test adapter isolates grounded AC-powered equipment and corrects the diagnostic signal polarity. The Not OK circuit drives the loop below 3.6 mA within 100 µs and recovers within 0.1 s after the fault is cleared; the receiving control system must handle the configured protection logic.
      Controller platform reference: 991 / 3300 NSv thrust measurement. Match electrical length, probe gap and receiving scale.
      The original technical excerpt for Bently Nevada 991-25-70-01-00 covers loop performance, diagnostic isolation and connection/loading diagrams. The separate installation guide covers transducer matching, loop-load checks, gap adjustment and protection tests.
      Original manufacturer pages retain their technical context. Use the Apter Power guide with the applicable manufacturer instructions and approved installation design.
      System and supply context: The 991-25-70-01-00 transmitter works with one matched 3300 NSv probe and extension cable. Probe, cable, test adapter and receiving equipment are separate unless itemized.

      Application scope: Use the loop for axial-position measurement on appropriate compressors, pumps, motors or fans. Protection alarming and logic belong to the receiving machinery control system; the transmitter does not reproduce every function of a continuous monitor.
      Prepare Bently Nevada 991-25-70-01-00 for its configured installation using these checks.
      Preserve the selected span

      Keep the receiving channel configured for 25–0–25 mils and confirm its direction.

      Match electrical length

      Use the correct probe and extension cable for the 7 m NSv system.

      Set the probe gap

      Allow usable travel in both directions before adjusting zero and span.

      Check the load budget

      Include cable and receiver resistance in the supply-dependent load limit.

      Isolate diagnostic instruments

      Use 122115-01 for grounded AC-powered equipment on PROX OUT.

      Prove protection response

      Test the normal thrust signal, Not OK indication and receiving alarm logic before release.

      Alternative Names

      991 25 70 01 00 Bently Nevada 99125700100

      Technical notes

      Engineering relationship: Include all cable and receiver resistance in the loop-load calculation. Rmax = 43.5 × (Vps − 12) Ω, with the stated 1000 Ω limit at 35 V; excessive resistance prevents full-scale output.

      Installation boundary: PROX OUT is not isolated from the 4–20 mA loop. Use the designated test adapter for grounded AC-powered equipment and account for the diagnostic signal polarity.

      Technical basis: Bently Nevada 991 Thrust Transmitter Datasheet, 141618 Rev. R. The selected range and mounting apply to 991-25-70-01-00. Electrical performance uses the stated reference conditions; TEST-input loop accuracy is separate from complete probe-and-target measurement accuracy.

      FAQ View All FAQ

      • How should the receiving scale be set for 991-25-70-01-00?
        Use the selected 25–0–25 mils full-scale thrust range with the 4–20 mA loop. Set the receiving channel to the same engineering-unit range and confirm direction during the controlled test.
      • Why does 991-25-70-01-00 need correct probe gap at both thrust extremes?
        A poor initial gap can prevent the loop from reaching full scale in one direction. Confirm the intended normal and counter-direction travel within the usable transducer range before setting zero and span.
      • How much total loop resistance can 991-25-70-01-00 drive from a 24 V supply?
        The maximum-load relation is R = 43.5 × (supply voltage − 12) Ω, giving 522 Ω at 24 V. Include receiver and cable resistance; excessive resistance prevents the output reaching 20 mA.
      • Are the zero and span adjustments on 991-25-70-01-00 interactive?
        They are non-interacting external adjustments beneath the transmitter label. Adjustment still requires the prescribed setup and verification of both endpoints and the intended thrust direction.
      • What is the permitted diagnostic cable reach from the BNC output of 991-25-70-01-00?
        The Proximitor diagnostic output has a maximum cable distance of 3 m. This is separate from the much longer permitted current-loop transmission distance under its wiring conditions.
      • Does 991-25-70-01-00 require an additional external Proximitor Sensor?
        No. Its integrated Proximitor function conditions the matched 3300 NSv probe and extension cable directly. The transmitter still requires the correct 7 m electrical transducer system.
      • Which temperature rating belongs to the transmitter body of 991-25-70-01-00?
        The transmitter operating range is -35 to +85 °C. The separate probe temperature capability is higher and must not be applied to the transmitter electronics.
      • How is the diagnostic signal loading of 991-25-70-01-00 specified?
        PROX OUT has a 10 kΩ output impedance and is calibrated for a 10 MΩ load. Test-equipment loading and isolation therefore matter when interpreting the diagnostic voltage.
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