Bently Nevada 3500/25-01-02-01 Enhanced Keyphasor Module

Bently Nevada 3500/25-01-02-01 Enhanced Keyphasor module code decoded

The Bently Nevada 3500/25-01-02-01 is a complete order code for a 3500/25 Enhanced Keyphasor Module, built from the manufacturer ordering table 3500/25-AA-BB-CC. Reading each field: A = 01 a single half-height two-channel Keyphasor card; B = 02 an I/O module with external terminations; C = 01 cNRTLus Class 1 Division 2 agency approval.

That means two Keyphasor channels, with field wiring brought to an external termination block rather than to the rack rear. Seven Star LLC supplies this configuration in Oman and the GCC for new rack builds or for like-for-like replacement of an existing code.

3500/25-01-02-01 technical specifications

Values from the 3500/25 datasheet (141532 Rev. Y).

What a Keyphasor signal does for the rack

A Keyphasor mark on the shaft produces one pulse per revolution, or several per revolution on a gear or speed wheel. The module conditions that pulse with an automatic or manual threshold, then distributes the clean digital signal to every monitor in the rack. Monitors use it to calculate speed and to compute 1X amplitude and phase. Without a valid Keyphasor the tracking filters fall back to their nominal settings, and vector values become unreliable.

The Enhanced module adds once-per-turn event generation from multi-event inputs, field-upgradeable firmware and asset-management reporting while keeping form, fit and function with older Keyphasor modules.

Decoding 3500/25-01-02-01 field by field

The code works as a build list: the main module is the Enhanced Keyphasor (149369-01 as spare), the rear module is the external-termination I/O (126648-01), and the approval code adds the cNRTLus marking. Choosing option 02 for field B means the external termination block (128718-01 for Euro connectors or 128726-01 for terminal strips) and a 129530-AAAA-BB cable, in lengths from 5 ft to 100 ft, are ordered as separate lines.

Selection and ordering checklist for 3500/25-01-02-01

• Confirm that two Keyphasor channels are enough; four need ordering option 02 for field A.
• Order the external termination block, the signal cable and its length with this code.
• Check that a Class 1 Division 2 approval is the correct one for the site, otherwise ATEX/IECEx/CSA (code 02) applies.
• Verify whether isolated I/O (options 04 and 05) is better for magnetic pickups tied in parallel.
• Confirm compatibility with the other half-height slot in the rack.

Installation, commissioning and maintenance

Install the half-height main module in a front slot (half-height modules need a mounting adapter in full-height slots; each rack may have only two main modules in the top and bottom half slots). Set the threshold mode to match the sensor: auto-threshold for clean Proximitor pulses, manual threshold for low-amplitude or noisy signals. Check the pulse count against the machine speed on the monitor display and confirm that front-panel OK and TX/RX LEDs are steady.

For magnetic pickups, remember that passive types need shaft speed above 200 rpm (3.3 Hz). Keep Keyphasor cabling separate from power cables and ensure shield grounding follows the plant standard.

Typical applications in Oman and the GCC

Keyphasor modules are present on every 3500 rack that measures speed or vector vibration on compressors, turbines, motors and pumps. In the GCC the sensors on the shaft are exposed to heat, oil mist and dust, so a clean signal and a firm probe mounting matter more than the module itself. The external-termination form is popular where the rack sits in a satellite shelter and field cables end in a central marshalling cabinet.

Related 3500/25 part numbers

Ordering 3500/25-01-02-01 as a complete assembly

The code 3500/25-01-02-01 describes the main module and its rear I/O as one order. Quote it together with the external termination block 128718-01 (Euro connectors) or 128726-01 (terminal strip) and one 129530-AAAA-BB cable for each I/O module, because the 3500/25 datasheet states that blocks and cables for external-termination modules must be ordered separately. Specify cable length: 5, 7, 10, 25, 50 or 100 feet, and choose assembled (02) or not assembled (01) as the cable assembly instruction.

If your rack already has the main module and only the rear I/O is missing, quote the I/O part number instead of the full code to avoid duplicate hardware.

Information to send with your RFQ

• Part number 3500/25-01-02-01 and quantity
• Sensor type and number of Keyphasor signals required
• Existing module and I/O part numbers in the rack
• Agency approval and destination in Oman or the GCC

Related Bently Nevada products: Bently Nevada 149369-01 3500/25 Enhanced Keyphasor Module, Bently Nevada 3500/32M 4-Channel Relay Module, Bently Nevada 125800-02 Isolated Keyphasor I/O Module, Internal, Bently Nevada 3500/50 Tachometer Module, Bently Nevada 3500/60-01-00 Temperature Monitor Module and Bently Nevada 3500/50M Tachometer Module.

Documents and quotation

The manufacturer datasheet for the 3500/25 Enhanced Keyphasor Module is attached on this page; read it together with your rack configuration and the site specification before confirming an order.

Seven Star LLC is an independent supplier in Muscat serving Oman and the GCC. Stock position, lead time, condition and the certificates that travel with the shipment are confirmed in the written quotation.