The GE / Bently Nevada 81546-01 is a dual hermetic relay module designed for the Bently Nevada 3300 Series Monitoring System. It functions as an XDCR I/O and record terminals board, accepting two proximity probe transducer signals and providing isolated relay outputs for signal input and record termination. The module delivers buffered transducer outputs via coaxial connectors and rear panel terminals, both short-circuit protected. User-programmable recorder outputs support +4 to +20 mA, 0 to -10 Vdc, or +1 to +5 Vdc formats, each proportional to full-scale monitor settings. Dual hermetic relays provide environmental protection in harsh industrial conditions. The 81546-01 meets API 670 requirements for machinery protection systems and integrates directly into the modular 3300 Series architecture.
## Technical Specifications
• **Input Signal:** Two proximity probe transducer signals
• **Input Impedance:** 10 kΩ
• **Signal Scale Factor:** Jumper-selectable: 20 mV/mil (0.787 V/mm) or 10 mV/mil (0.392 V/mm)
• **Transducer Supply Voltage:** −24 Vdc, current-limited per channel
• **Recorder Output Options:** +4 to +20 mA, 0 to −10 Vdc, or +1 to +5 Vdc (user-programmable)
• **Output Impedance (Voltage):** 100 Ω
• **Minimum Load Resistance:** 10 kΩ
• **Voltage Compliance (Current Mode):** 0 to +12 Vdc across load
• **Load Resistance (Current Mode):** 0 to 600 Ω
• **Recorder Output Accuracy at +25°C:** +4 to +20 mA: 0.7% of signal ±0.09 mA; +1 to +5 Vdc: 1.1% of signal ±10 mV; 0 to −10 Vdc: 1.1% of signal ±15 mV
• **Alarm Setpoint Range:** 0 to 100% of full-scale (LCD resolution ±1.6% of full-scale, repeatability ±0.4%)
• **Relays:** Two hermetically sealed units with isolated inputs and outputs
## Key Features
• Short-circuit protected transducer outputs and recorder outputs
• Dual red alarm LEDs per channel (Alert and Danger indicators)
• First-out alarm indication with flashing display
• Hermetically sealed relays for moisture and contaminant protection
## Compatibility & Integration
• Bently Nevada 3300 Series Monitoring System compatible
• API 670 standard compliant
• Modular design supports expandable system configurations
