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Bently Nevada 3500/25 126648-01 Keyphasor I/O Module
Manufacturer: Bently Nevada
Product Number: 3500/25 (126648-01)
Category: Enhanced Keyphasor I/O Module (3500 System)
Number of Channels: 2 (half-height)
Input Types: Proximity probes, magnetic pickups
Function: Accepts input signals and provides Keyphasor outputs for synchronous data acquisition
Product Description
The Bently Nevada 3500/25 126648-01 is an Enhanced Keyphasor I/O Module designed for use within the Bently Nevada 3500 Machinery Protection System. It is a half-height, two-channel module that accepts input signals from proximity probes or magnetic pickups and converts them into precise Keyphasor pulses. These pulses provide accurate reference timing for machinery speed, phase, and vibration analysis. This version supports external terminations, offering flexible wiring options and simplified maintenance for industrial environments.
Main Features
-
Two-channel half-height design, optimized for rack-based monitoring systems
-
External termination configuration for flexible installation and simplified cabling
-
Converts probe or pickup signals into once-per-turn or multiple-event-per-turn Keyphasor outputs
-
High frequency response supporting speeds up to 20 kHz
-
Downward-compatible with earlier Keyphasor module versions
-
Supports redundant and TMR configurations for critical machinery applications
-
Equipped with LED indicators for module health and communication status
-
Designed for reliable operation in harsh industrial conditions
Technical Specifications
Dimensions and Weight
| Item | Specification |
|---|---|
| Dimensions | 241.3 × 24.4 × 103.1 mm |
| Weight | 0.46 kg |
General Information
| Item | Specification |
|---|---|
| Manufacturer | Bently Nevada (Baker Hughes) |
| Model Number | 3500/25 126648-01 |
| Product Type | Enhanced Keyphasor I/O Module (External Term.) |
| Module Height | Half-height, two-channel |
| Mounting | 3500 rack system |
| Compatibility | Works with Enhanced Keyphasor modules |
Electrical and Signal Characteristics
| Item | Specification |
|---|---|
| Input Signal Types | Proximity probes, magnetic pickups |
| Input Signal Range | +0.8 V to –21 V (non-isolated); +5 V to –11 V (isolated) |
| Input Impedance | ≥ 21.8 kΩ |
| Input Frequency Range | 1 to 1,200,000 cpm (0.017 to 20 kHz) |
| Output Frequency | 1 to 99,999 cpm (0.017 to 1,667 Hz) |
| Speed Accuracy | ±1 cpm (low range), ±1% (high range) |
| Threshold (Auto) | ≥ 2 V peak-to-peak |
| Threshold (Manual) | Selectable 0 to –20 V DC |
| Hysteresis | Selectable 0.2 to 2.5 V |
| Output Configuration | Buffered Keyphasor outputs (front BNC, rear terminals) |
| Output Impedance | ≤ 504 Ω |
| Transducer Supply | –24 V DC, max 40 mA per channel |
| Indicators | OK, TX/RX LEDs |
Environmental and Compliance Specifications
| Item | Specification |
|---|---|
| Operating Temp. | –30 °C to +65 °C |
| Storage Temp. | –40 °C to +85 °C |
| Humidity | Up to 95% non-condensing |
| Certifications | CSA / NRTL / CE for industrial use |
Industry Applications
The Bently Nevada 3500/25 126648-01 Keyphasor I/O Module is widely used across industries that rely on high-speed rotating machinery. Typical applications include:
-
Oil & Gas: Turbine and compressor speed/phase reference monitoring
-
Power Generation: Generator and steam turbine vibration and shaft speed analysis
-
Petrochemical & Chemical Plants: Reactor and pump monitoring with precise phase tracking
-
Manufacturing: Motors, blowers, and gearbox condition monitoring
-
Mining & Heavy Industry: Harsh-environment machinery monitoring with reliable speed detection
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Bently Nevada 3500/25 126648-01 Keyphasor I/O Module
Manufacturer: Bently Nevada
Product Number: 3500/25 (126648-01)
Category: Enhanced Keyphasor I/O Module (3500 System)
Number of Channels: 2 (half-height)
Input Types: Proximity probes, magnetic pickups
Function: Accepts input signals and provides Keyphasor outputs for synchronous data acquisition
Product Description
The Bently Nevada 3500/25 126648-01 is an Enhanced Keyphasor I/O Module designed for use within the Bently Nevada 3500 Machinery Protection System. It is a half-height, two-channel module that accepts input signals from proximity probes or magnetic pickups and converts them into precise Keyphasor pulses. These pulses provide accurate reference timing for machinery speed, phase, and vibration analysis. This version supports external terminations, offering flexible wiring options and simplified maintenance for industrial environments.
Main Features
-
Two-channel half-height design, optimized for rack-based monitoring systems
-
External termination configuration for flexible installation and simplified cabling
-
Converts probe or pickup signals into once-per-turn or multiple-event-per-turn Keyphasor outputs
-
High frequency response supporting speeds up to 20 kHz
-
Downward-compatible with earlier Keyphasor module versions
-
Supports redundant and TMR configurations for critical machinery applications
-
Equipped with LED indicators for module health and communication status
-
Designed for reliable operation in harsh industrial conditions
Technical Specifications
Dimensions and Weight
| Item | Specification |
|---|---|
| Dimensions | 241.3 × 24.4 × 103.1 mm |
| Weight | 0.46 kg |
General Information
| Item | Specification |
|---|---|
| Manufacturer | Bently Nevada (Baker Hughes) |
| Model Number | 3500/25 126648-01 |
| Product Type | Enhanced Keyphasor I/O Module (External Term.) |
| Module Height | Half-height, two-channel |
| Mounting | 3500 rack system |
| Compatibility | Works with Enhanced Keyphasor modules |
Electrical and Signal Characteristics
| Item | Specification |
|---|---|
| Input Signal Types | Proximity probes, magnetic pickups |
| Input Signal Range | +0.8 V to –21 V (non-isolated); +5 V to –11 V (isolated) |
| Input Impedance | ≥ 21.8 kΩ |
| Input Frequency Range | 1 to 1,200,000 cpm (0.017 to 20 kHz) |
| Output Frequency | 1 to 99,999 cpm (0.017 to 1,667 Hz) |
| Speed Accuracy | ±1 cpm (low range), ±1% (high range) |
| Threshold (Auto) | ≥ 2 V peak-to-peak |
| Threshold (Manual) | Selectable 0 to –20 V DC |
| Hysteresis | Selectable 0.2 to 2.5 V |
| Output Configuration | Buffered Keyphasor outputs (front BNC, rear terminals) |
| Output Impedance | ≤ 504 Ω |
| Transducer Supply | –24 V DC, max 40 mA per channel |
| Indicators | OK, TX/RX LEDs |
Environmental and Compliance Specifications
| Item | Specification |
|---|---|
| Operating Temp. | –30 °C to +65 °C |
| Storage Temp. | –40 °C to +85 °C |
| Humidity | Up to 95% non-condensing |
| Certifications | CSA / NRTL / CE for industrial use |
Industry Applications
The Bently Nevada 3500/25 126648-01 Keyphasor I/O Module is widely used across industries that rely on high-speed rotating machinery. Typical applications include:
-
Oil & Gas: Turbine and compressor speed/phase reference monitoring
-
Power Generation: Generator and steam turbine vibration and shaft speed analysis
-
Petrochemical & Chemical Plants: Reactor and pump monitoring with precise phase tracking
-
Manufacturing: Motors, blowers, and gearbox condition monitoring
-
Mining & Heavy Industry: Harsh-environment machinery monitoring with reliable speed detection
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