Description
Note: Many products are not yet listed. Please contact us for more product information. Our supply channels are constantly expanding, and we currently have 20 stable shared supply channels. Please confirm the model, product, price, and all other necessary information with customer service before placing an order. We offer new, refurbished, and used products, and prices are adjusted according to the year of the item you require.
3. Product Introduction (Anti-Template)
Accurate once-per-revolution timing is essential for vibration analysis and overspeed protection on critical rotating equipment. The 125792-01 (3500/25 Enhanced Keyphasor Module) supplies that reference by conditioning signals from proximity probes or magnetic pickups and distributing clean digital Keyphasor pulses to the other monitors in the rack.
It occupies a half-height slot, supports two independent channels, and remains fully compatible with existing 3500 system configurations. Plants that standardized on the 3500 platform keep this module available because loss of the Keyphasor reference can disable phase-related alarms and vector measurements across multiple channels until a replacement is installed.
125792-01
125792-01
125792-01
125792-01
125792-01
4. Key Technical Specifications
| Parameter | Value |
|---|---|
| Module Type | Half-height, 2-channel Enhanced Keyphasor |
| Input Signal Sources | Proximity probes or magnetic pickups |
| Input Signal Range (typical non-isolated) | +0.8 V to –21.0 V |
| Frequency / Speed Range | 1 to 1,200,000 cpm (0.017 Hz to 20 kHz) |
| Output | Buffered Keyphasor signals (front-panel coaxial and rear connectors) |
| Power Consumption | Approximately 3.2 W typical |
| Operating Temperature | –30 °C to +65 °C (non-barrier version) |
| Form Factor | Half-height 3500 module |
| System Compatibility | 3500 Machinery Protection System racks |
5. Field Application & Technical Pitfalls (The Engineer’s Guide)
This module is routinely installed on steam and gas turbines, compressors, and large motors where 1X phase and speed reference are required for vibration monitoring and machinery protection. Dual-channel capability allows primary and backup Keyphasor inputs or coverage of two independent shafts.
Three pitfalls appear during replacement:
Probe gap and signal amplitude – the Keyphasor pulse must have adequate amplitude and clean edges; an out-of-range gap or noisy signal produces intermittent or missing triggers.
Channel configuration and pairing – incorrect channel assignment or failure to configure paired modules in TMR systems can leave monitors without a valid reference.
Buffered output loading – external diagnostic equipment connected to the buffered outputs must not overload the drivers, or the internal Keyphasor distribution can be affected.
One plant experienced intermittent “Keyphasor Not OK” alarms after a module swap. The new unit was healthy, but the proximity probe gap had drifted outside the acceptable range; adjusting the probe restored stable once-per-turn pulses within minutes.
6. Quality Control (QC) SOP & Transparency
- Inbound Verification – OEM labeling, part number, and date codes are photographed and checked against the packing list; any signs of prior field use are noted.
- Live Rig Testing – module is installed in a known-good 3500 rack, powered, and exercised with simulated proximity and magnetic-pickup signals across both channels.
- Parameter Testing – trigger threshold, frequency response, and buffered output integrity are verified; power consumption is measured.
- Final QA & Packaging – unit is sealed in an anti-static bag with desiccant, fitted with a QC-passed label showing test date and technician ID, then double-boxed for shipment.
7. Frequently Asked Questions (FAQ)
Is the 125792-01 still the current Keyphasor module?
It is the earlier Enhanced Keyphasor PWA. A later revision (149369-01) exists, but the 125792-01 remains form-, fit-, and function-compatible in most 3500 systems. Confirm exact revision requirements with the system configuration.
How many Keyphasor channels does it provide?
Two independent channels in a half-height module.
What sensors can be connected?
Proximity probes (eddy-current) or magnetic pickups.
Can two modules be used for redundancy?
Yes. Dual Keyphasor modules are commonly installed for TMR or high-availability configurations to supply primary and secondary references.
What warranty comes with a new-surplus unit?
Twelve months from shipment against defects in materials and workmanship when installed within the published ratings.
How do I confirm the module is healthy after installation?
Apply rack power, inject a clean once-per-turn signal on each channel, verify Keyphasor OK status on the monitors that use the reference, and confirm stable speed and phase readings under both static and rotating conditions.
