138708-01 Shaft Absolute I/O Module

Overview

Place of Origin:	USA
Brand Name:	Bently Nevada
Model Number:	138708-01
Packaging Details:	Original new Factory Sealed
Delivery Time:	5-7 days
Payment Terms:	T/T
Supply Ability:	In stock

Quick Detail

Description

The 138708-01 Shaft Absolute I/O Module is designed for the Bently Nevada 3500/42M monitor to process shaft absolute measurements in automation systems. The 138708-01 Shaft Absolute I/O Module accepts 1–4 proximity, velocity, or acceleration transducer signals and provides shaft absolute radial vibration, direct vibration, and velocity outputs. Input impedance is 10 kΩ, with typical power consumption of 7.7 W.

The 138708-01 Shaft Absolute I/O Module supports shaft absolute sensitivity of 3.94 mV/µm (100 mV/mil) or 7.87 mV/µm (200 mV/mil). Velocity sensitivity options include 20 mV/(mm/s), 5.8 mV/(mm/s), or 4 mV/(mm/s). Direct filter response is user-programmable from 4–4000 Hz or 1–600 Hz, and velocity response from 3–4000 Hz. Measurement accuracy is ±0.33% typical (±1% max). The 138708-01 Shaft Absolute I/O Module occupies one full-height rear rack slot and operates from –30°C to +65°C, suitable for turbine and compressor monitoring in industrial automation.

Applications

Application in Steam Turbine Shaft Vibration Monitoring

The 138708-01 Shaft Absolute I/O Module processes proximity probe signals to measure shaft absolute radial vibration in steam turbines. With programmable filters up to 4000 Hz, it captures high-frequency vibration components for early detection of imbalance or misalignment. Automation systems use the output to trigger alarm setpoints and shutdown sequences.

Application in Gas Compressor Thrust Position Tracking

By accepting up to four transducer inputs, the 138708-01 Shaft Absolute I/O Module enables simultaneous monitoring of thrust position and shaft absolute motion in gas compressors. The ±0.33% typical accuracy supports precise axial displacement measurement, which is used to activate protective relays when thrust exceeds configured limits.

Application in High-Speed Pump Velocity Measurement

With velocity sensitivity options such as 20 mV/(mm/s), the 138708-01 Shaft Absolute I/O Module measures shaft absolute velocity in high-speed pumps. The 3 to 4000 Hz programmable velocity response allows integration into condition monitoring systems for rotating equipment.

Application in Multi-Channel Automation Rack Integration

The 138708-01 Shaft Absolute I/O Module occupies one full-height rear slot and works with the 3500 rack architecture, enabling centralized vibration input processing in distributed control cabinets. Multiple channels reduce the need for additional external signal conditioners.

Specifications

Competitive Advantage

Competitive Advantage in Multi-Sensor Input Handling

The 138708-01 Shaft Absolute I/O Module supports 1 to 4 transducer signals in one module, reducing rack space and wiring complexity compared with single-channel input boards.

Competitive Advantage in Wide Frequency Configuration

With direct filter settings from 1 to 4000 Hz and velocity response up to 4000 Hz, the 138708-01 Shaft Absolute I/O Module covers low-speed and high-speed rotating machinery without changing hardware.

Competitive Advantage in High Measurement Accuracy for Control Logic

The ±0.33% typical full-scale accuracy of the 138708-01 Shaft Absolute I/O Module ensures precise shaft absolute values for alarm comparison and automated trip systems in critical rotating equipment.