Shinkawa BH-150-03 Signal Conditioner / Preamplifier Unit
Shinkawa BH-150-03 Signal Conditioner / Preamplifier Unit is a high-precision transducer interface manufactured by Shinkawa Electric. Designed for critical machinery protection systems, the BH-150-03 converts raw high-frequency signals from non-contact eddy-current proximity probes into calibrated, linear voltage or current outputs for real-time monitoring of shaft vibration, axial displacement, and rotational speed.
Technical Parameter List
| Parameter | Specification |
| Model Code | BH-150-03 |
| Manufacturer | Shinkawa Electric Co., Ltd. |
| Device Type | Preamplifier / Signal Conditioner (Driver Unit) |
| Compatible Sensors | Shinkawa VK-series eddy-current proximity probes |
| Output Signal Range | Standard -2V to -18V DC linear voltage (or 4–20mA current loop, variant dependent) |
| Frequency Response | DC to 10 kHz (-3 dB) |
| Linear Range | Typically 0.5 mm to 4.0 mm (sensor model dependent) |
| Power Supply Requirements | -24V DC (±10%) auxiliary supply |
| Connection Type | Screw terminals / Coaxial probe input connector |
| Mounting Standard | Field junction box DIN rail or baseplate mounting |
Core Advantages & Product Features
High-Precision Linearization: Translates nonlinear probe gap changes into precise linear outputs across the full measurement range.
Low-Noise Circuit Design: Built-in hardware filtering suppresses high-frequency electrical noise and electromagnetic interference (EMI) in industrial environments.
Rapid Response Time: Delivers real-time signal transmission to enable immediate trip response during sudden shaft displacement or high vibration events.
Built-in OK Circuit Support: Monitors sensor loop health and cable continuity, preventing false machinery trip triggers in the event of wire damage.
Compact Field Housing: Rugged design allows close proximity installation near field probes, reducing raw high-frequency cable runs.
Model Classification
BH-150-03: Standard driver unit variant with designated gain and range configuration.
BH-150 Series (BH150): Base signal conditioner family for eddy-current probe systems.
VK-202A / VK-452A: Eddy-current displacement probes feeding raw input into BH-150 units.
VM-3D2 / VM-3V2: System rack monitor modules processing output signals from BH-series drivers.
Environmental Tolerance Conditions
Operating Temperature: -20°C to +70°C (-4°F to 158°F)
Storage Temperature: -30°C to +85°C (-22°F to 185°F)
Operating Relative Humidity: 5% to 95% RH (Non-condensing)
Vibration Resistance: Conforms to IEC 60068-2-6 guidelines for field instrumentation
Protection Rating: IP20 (Requires mounting inside an IP54 or NEMA 4X junction box)
BH-150-03
Installation Method
Junction Box Mounting: Mount the BH-150-03 securely on a DIN rail or mounting plate inside a sealed local field terminal box near the machine.
Sensor Connection: Connect the probe extension cable to the coaxial connector on the BH-150-03. ensuring the connector insulator is clean and free of moisture.
Output Wiring: Wire power (-24V DC), common, and output signal lines using shielded twisted-pair cables.
Shielding & Grounding: Connect the cable shield braid to the system grounding point at the main monitor rack end only to prevent ground potential loops.
Operating Instructions
Gap Voltage Adjustment: Set physical probe distance using a digital multimeter on the output terminals until reading the designated electrical zero voltage (e.g., -10V DC) prior to locking the probe position.
Linearity Check: Perform annual zero/span checks with a precision micrometer fixture to verify output curve compliance.
Connector Care: Inspect field coaxial connections periodically for tight mechanical engagement and environmental seal integrity.