Shinkawa BH-150 Signal Conditioner / Preamplifier Unit
Shinkawa BH-150 Signal Conditioner / Preamplifier Unit (commonly referenced as the BH150) is an industrial-grade transducer interface designed by Shinkawa Electric. Functioning as a high-precision signal converter, the BH-150 processes raw inputs from non-contact eddy-current proximity probes and velocity transducers, converting high-frequency electromagnetic field variations into stable, linear voltage or current outputs. Engineered specifically for turbomachinery protection and condition monitoring systems, it delivers low-noise signal conditioning for critical rotating assets including steam turbines, high-pressure gas compressors, boiler feed pumps, and heavy industrial blowers.
Product Advantages and Features
High-Fidelity Signal Linearization: Converts raw proximity probe gap signals into highly linear output curves, maintaining precise measurements across wide displacement ranges.
Superior Noise Immunity: Built-in EMI/RFI filtering shields against high-frequency electrical noise typical of power generation and chemical processing environments.
Fast Dynamic Response: Exceptional transient response speed ensures immediate transmission of rapid shaft position changes and sudden vibration spikes to monitoring relays.
Rugged Industrial Enclosure: Built to withstand harsh field environments, resisting ambient temperature swings, mechanical vibration, and electromagnetic surges.
Continuous Sensor Health Monitoring: Includes built-in transducer integrity checking (OK circuit compatibility) to prevent false trips caused by broken sensor lines or cable damage.
Other Models in the Same Series
| Model Code | Module / Sensor Type | Primary Function |
| BH-150 (BH150) | Preamplifier / Signal Conditioner | Converts raw eddy-current probe signals into linear output voltages |
| BH-100 Series | Compact Signal Conditioner Unit | Legacy compact signal converter for vibration monitoring |
| VK-202A / VK-452A | Eddy-Current Proximity Sensors | Non-contact displacement probes supplying input to BH units |
| VM-3D2 | Thrust / Axial Position Monitor Module | System rack module processing signal outputs from BH/VK units |
| VM-3V2 | Vibration Monitor Module | Dual-channel shaft vibration monitoring card for VM system racks |
Installation and Maintenance
Mounting Procedure: Secure the BH-150 driver unit firmly using vibration-dampening hardware within a NEMA/IP-rated junction box positioned near the sensor site to minimize unconditioned cable length.
Field Wiring Practice: Always connect proximity probe extension cables and power/signal output lines using shielded twisted-pair cabling. Earth the cable shield braid at the main monitor rack end only to prevent destructive ground loops.
Gap Calibration: Verify the initial electrical zero (gap voltage) using a precision digital multimeter at the raw signal terminal during installation before locking sensor positions.
Routine Servicing: Perform annual linearity checks using a micrometer fixture or precision signal generator to confirm output voltage accuracy across the full displacement range.