Bently Nevada 991-06-70-02-00 – Thrust Position Transmitter | 3500 Series Machinery Protection System
In high-speed rotating machinery, axial displacement is one of the most critical failure modes — a thrust bearing failure can destroy a turbine or compressor in seconds. The Bently Nevada 991-06-70-02-00 Thrust Position Transmitter is engineered specifically for continuous, real-time axial position monitoring within the 3500 Series Machinery Protection System. Designed for procurement engineers who demand zero-compromise reliability, this transmitter delivers conditioned 4–20 mA output directly compatible with 3500 rack modules, DCS inputs, and safety instrumented systems.
At Konmask.com, we source the 991-06-70-02-00 through verified industrial channels, providing B2B buyers with traceable, inspection-ready units backed by documentation support.
Complete Technical Specifications
- Part Number: 991-06-70-02-00
- Manufacturer: Bently Nevada (Baker Hughes)
- Series / Platform: 3500 Machinery Protection System
- Function: Thrust Position (Axial Displacement) Transmitter
- Output Signal: 4–20 mA analog (proportional to axial position)
- Input: Proximitor / eddy-current probe signal (typically –18 VDC gap voltage range)
- Measurement Range: Configurable per application (typically ±0.5 mm to ±2.0 mm full scale)
- Power Supply: 18–30 VDC (loop-powered or rack-supplied)
- Operating Temperature: –40°C to +85°C
- Enclosure / Housing: DIN-rail or rack-mount compatible module format
- Approvals: CE, SIL-capable (refer to system SIL documentation)
- Weight: Approx. 500 g
- Country of Origin: USA
Proven Application Environments
- Steam & Gas Turbines — axial rotor position monitoring for thrust bearing protection
- Centrifugal Compressors — continuous axial displacement measurement in API 670-compliant systems
- Pumps & Fans — early-warning axial shift detection in critical rotating equipment
- Petrochemical & Refinery Plants — SIS-integrated machinery protection loops
- Power Generation — turbine-generator sets requiring continuous online monitoring
- LNG & Offshore Platforms — harsh-environment axial monitoring with wide temperature tolerance
Engineering Advantages
- Direct 3500 Rack Integration: Plug-compatible with Bently Nevada 3500/42M, 3500/44M, and related position monitor modules — no signal conditioning adapters required.
- High-Resolution Output: 4–20 mA output provides fine-resolution axial position data for both protection trip logic and condition monitoring trending.
- API 670 Compliance: Meets the axial position measurement requirements of API Standard 670 (5th Edition) for machinery protection systems.
- Noise Immunity: Shielded signal path and differential input design reject common-mode electrical noise in industrial environments.
- Fail-Safe Design: Upscale or downscale fault output configurable to drive safety system response on sensor or wiring fault.
- Long-Term Stability: Precision analog circuitry maintains calibration accuracy over extended service intervals.
System Architecture & Signal Flow
The 991-06-70-02-00 operates within the standard Bently Nevada eddy-current measurement chain:
- Probe: 3300 XL or 7200 Series proximity probe (eddy-current, non-contacting)
- Extension Cable: Matched impedance cable (armored or standard)
- Proximitor / Driver: 3300 XL 8mm or equivalent driver module (–24 VDC bias)
- Transmitter (this unit): 991-06-70-02-00 converts gap voltage to 4–20 mA
- Monitor Module: 3500/42M Position Monitor or 3500/44M Thrust & Differential Expansion Monitor
- Output: Trip relay, 4–20 mA retransmission, Modbus/FOUNDATION Fieldbus to DCS/SIS
Sourcing & Quality Verification
- Source: Verified industrial distributors and OEM-authorized channels
- Inspection: Visual, label, and functional pre-shipment inspection available on request
- Documentation: Certificate of conformance, original packaging, and datasheet provided
- Traceability: Lot/serial number documentation available for regulated industries
- Warranty: 12-month Konmask supply warranty; OEM warranty terms apply where applicable
- Anti-Counterfeit: All units verified against Bently Nevada part marking standards before dispatch
Procurement Process
- Step 1: Submit RFQ via support@konmask.com with quantity and required delivery date
- Step 2: Receive quotation with lead time, unit price, and available documentation within 24 hours
- Step 3: Confirm PO — T/T, L/C, or agreed payment terms accepted
- Step 4: Pre-shipment inspection report issued; unit dispatched with full documentation package
- Step 5: DHL / FedEx / sea freight — worldwide delivery with tracking
Technical FAQ
Q: Is the 991-06-70-02-00 compatible with the 3500/44M Thrust & Differential Expansion Monitor?
A: Yes. The 991-06-70-02-00 is designed to interface directly with the 3500/44M and other 3500 Series position monitor modules.
Q: What probe system is required upstream of this transmitter?
A: A Bently Nevada 3300 XL 8mm or 5mm proximity probe with matched extension cable and Proximitor driver is the standard upstream configuration.
Q: Can this transmitter be used in SIL-rated safety loops?
A: The 3500 platform supports SIL 1/2 applications; consult the system-level SIL documentation and your functional safety engineer for loop SIL verification.
Q: What is the typical lead time for the 991-06-70-02-00?
A: Standard stock lead time is 3–7 business days. For urgent requirements, contact us directly for expedited options.
Q: Do you provide calibration certificates?
A: Factory calibration documentation is available. Third-party calibration can be arranged upon request.
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