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Yokogawa FX1012-4-2-L
Product Overview:
The FX1012-4-2-L is a 4-channel, 2-wire transmitter input module for the Yokogawa FAST/TOOLS distributed control system. The designation breaks down as: FX1012 (module type), 4 (4 channels), 2 (2-wire 4-20mA input), L (low-power/linear configuration). This module accepts signals from 2-wire loop-powered transmitters (pressure, temperature, flow, level).
Detailed content
Technical Specifications:
| Parameter | Specification |
|---|---|
| Number of Channels | 4 channels |
| Input Signal Type | 2-wire 4-20mA DC (loop-powered) |
| Input Impedance | 250 Ω (built-in precision resistor) |
| Measurement Accuracy | ±0.1% of span (typical) |
| Resolution | 16-bit A/D converter (65,536 steps) |
| Common Mode Rejection | > 100 dB at 50/60 Hz |
| Isolation Voltage | 1500 VAC (channel-to-channel, channel-to-backplane) |
| Loop Power Supply | 24VDC (provided by module, max 30VDC) |
| Max Loop Resistance | 600 Ω (at 24VDC supply) |
| Operating Temperature | 0°C to +55°C (+32°F to +131°F) |
| Power Consumption | < 2.5 W (total module) |
| Dimensions (W×H×D) | 25 × 160 × 120 mm (approx.) |
| Weight | Approximately 0.2 kg |
Functional Features:
- Built-in 250 Ω precision resistor — no external resistor required
- Per-channel linearization tables for direct transmitter type selection
- Open-loop detection — alarm generated if transmitter wire breaks
- Per-channel scaling configurable via FAST/TOOLS engineering station
- Diagnostic data: Input value, deviation, alarm status transmitted to DCS
- HART protocol compatible (pass-through for smart transmitter configuration)
Structure Characteristics:
- DIN rail mountable within FAST/TOOLS I/O carrier
- Spring-clamp terminal blocks for fast field wiring
- LED indicators: Power (green), Alarm (red) per channel group
- Backplane connector: 96-pin Eurocard-compatible edge connector
Applicable Industries:
- Oil & Gas — Wellhead pressure and temperature monitoring
- Chemical Processing — Reactor temperature and level measurement
- Power Generation — Boiler drum level, steam flow
- HVAC Systems — Chilled water temperature and flow
- Food & Beverage — Tank level and temperature monitoring
Installation Requirements:
- Mount in FAST/TOOLS compatible I/O carrier
- Use shielded twisted-pair cable (22-18 AWG) for all transmitter connections
- Ground shield at DCS end only to prevent ground loops
- Maximum cable length: 1000 m (depending on wire gauge and loop resistance)
- Loop power must be 24VDC ±10%
Usage Precautions:
- Never apply external voltage to input terminals — use 2-wire transmitters only
- Maximum loop resistance must not exceed 600 Ω at 24VDC
- HART communication requires 250 Ω minimum loop resistance — built-in resistor satisfies this
- Isolate inputs from high-voltage transients using signal conditioners when required
- Calibrate annually or per site-specific maintenance schedule
