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Phone: +86 16626708626Description
3. Key Technical Specifications
| Parameter | Specification Value |
| Manufacturer | Bently Nevada / Baker Hughes |
| Part Number | 24765-01-01 |
| Transducer Type | DC Linear Variable Differential Transformer (DC-LVDT) |
| Linear Range (Option -01) | 25.4 mm (1.00 inch / ±0.5 in) |
| Spring Return (Option -01) | Included (Spring-loaded plunger) |
| Scale Factor | 0.346 V/mm (8.79 V/in) nominal |
| Operating Input Voltage | +13.5 VDC to +26 VDC unregulated (30 mA min) |
| Linearity / Accuracy | ±1% of full scale |
| Operating Temperature | 0°C to +71°C (32°F to +160°F) |
| Housing Construction | Series 400 magnetic stainless steel body |
| System Compatibility | Bently Nevada 3500/45 Position Monitor & legacy 3300 systems |
4. Product Introduction & Supply Chain Strategy
The Bently Nevada 24765-01-01 is a DC Linear Variable Differential Transformer (DC-LVDT) transducer assembly designed to measure casing thermal growth on steam turbines, gas turbines, and large industrial compressors. Mounted between the turbine shell and the foundation or soleplate, it converts mechanical displacement into a linear DC voltage signal processed by Bently Nevada 3500/45 Position Monitors to prevent binding, alignment loss, and severe mechanical damage during thermal ramp-up.
This product is a Brand New Surplus unit. It is not used, not pulled from a decommissioned power plant, and not refurbished. All assemblies undergo strict physical and electrical verification to guarantee factory calibration and signal accuracy. Stocking a genuine New Surplus 24765-01-01 transducer on-site prevents costly turbine startup delays caused by uncalibrated or failing position sensors. Refurbished LVDTs frequently suffer from spring fatigue, internal winding degradation from high thermal cycling, and compromised core-sleeve tolerances that cause measurement sticking or drift. Sourcing factory-fresh surplus guarantees original spring return tension, uncompromised internal electronics, and reliable mechanical tracking.
24765-01-01
24765-01-01
5. Installation & Configuration Guide
1.Pre-Installation Preparation & Safety:Perform LOTO on monitoring loop; check casing temperature.
Verify that the turbine is in a safe condition for sensor maintenance and enforce Lockout/Tagout (LOTO) on associated alarm/trip outputs in the Bently Nevada 3500 system. Ensure the mounting area on the turbine casing or soleplate has cooled to safe working temperatures.
2.Legacy Transducer Removal:Disconnect field wiring and unbolt transducer housing.
Disconnect the Teflon-insulated lead wires from the field junction box. Loosen the mounting clamp bolts securing the old 24765 housing, then carefully retract the spring-loaded rod assembly from its contact pad on the turbine shell.
3.Mechanical Mounting & Physical Null Adjustment:Position housing, set mechanical zero/null, and secure clamps.
Mount the new 24765-01-01 housing into the mounting bracket. Position the transducer body so that the spring-loaded plunger makes firm contact with the turbine reference pad at cold position, pre-loading the rod to establish proper electrical null within the 25.4 mm (1.0 in) linear working range. Torque mounting clamps to specification.
4.Wiring Verification & 3500 System Calibration:Land lead wires, verify DC output voltage, and re-arm monitor.
Connect lead wires to the field wiring box (apply ferrite bead if required for CE installations). Supply +24 VDC power and verify the DC output voltage at the cold position using a multimeter. Confirm full-scale tracking in Bently Nevada 3500 Rack Configuration software before re-arming position trip logic.
6. Firmware/Software Versions & Upgrade Notes
- Part Number Breakdown:
24765-AA-BBformat — Option-01(Linear Range = 25.4 mm / 1.0 in) and Option-01(With Spring Return). Ensure both option dashes match your field requirements. - Rack Configuration: In the Bently Nevada 3500/45 Position Monitor software, select “DC LVDT Case Expansion” as the channel transducer type and enter the scale factor of 0.346 V/mm (8.79 V/in).
- DC vs. AC LVDT Replacement: The 24765 is a DC-powered LVDT (contains internal signal conditioning). It cannot be interchanged directly with AC-LVDT systems without verifying channel power configuration.
7. Frequently Asked Questions (FAQ)
Q: Is this Bently Nevada 24765-01-01 transducer Brand New Surplus or refurbished?
A: This transducer assembly is 100% Brand New Surplus stock. It has never seen operational service in a plant, exhibits zero spring tension wear, and is preserved in original protective packaging.
Q: Why choose New Surplus over a refurbished DC-LVDT transducer?
A: Case expansion sensors operate under severe environmental conditions, including elevated ambient temperatures and continuous machine vibration. Refurbished LVDTs often have worn internal guide bushings or degraded internal excitation circuitry that leads to non-linear voltage outputs or stuck plungers during thermal expansion. New Surplus hardware guarantees original linear accuracy and uncompromised spring return mechanics.
Q: What does the “-01-01” suffix represent in the part number?
A: The first -01 specifies a 25.4 mm (1.00 inch) linear measurement range. The second -01 specifies the inclusion of an internal spring return mechanism on the plunger rod.
Q: Can this sensor connect directly to a PLC or DCS without a Bently Nevada rack?
A: Yes. Because the 24765-01-01 is a DC-LVDT with internal conditioning, it accepts +13.5 to +26 VDC power and provides a proportional DC voltage output (+1 to +6 VDC range) that can be read by standard analog input cards on PLCs or DCS hardware.
Q: What warranty is provided with this New Surplus component?
A: This Bently Nevada 24765-01-01 transducer assembly includes a full 1-year replacement warranty covering mechanical and electrical integrity.
