Process Control Isolation Solution – AutomationDirect FC-33 | SOLO / FC Series
Where This Product Is Used
The AutomationDirect FC-33 is a loop-powered 4–20 mA signal conditioner and isolator engineered for demanding industrial environments. Engineers specify this module wherever ground loops, common-mode noise, or long cable runs threaten signal integrity between field transmitters and PLC/DCS analog input cards.
- PLC Analog I/O Isolation — Breaks ground loops between field instruments and Siemens, Allen-Bradley, Mitsubishi, or AutomationDirect PLCs
- Process Control Panels — Conditions 4–20 mA signals from pressure, temperature, flow, and level transmitters before reaching the control system
- Water & Wastewater Treatment — Protects instrumentation loops in electrically noisy pump stations and lift stations
- Oil & Gas Wellhead Automation — Isolates RTU inputs from field sensors in hazardous or remote locations
- Building Automation Systems (BAS) — Interfaces HVAC sensors with BMS controllers across long cable runs
- Machine Tool & Packaging Lines — Eliminates interference between servo drives and analog feedback loops
- Power Generation & Utilities — Conditions transmitter outputs in high-voltage environments
Technical Specifications
| Model | FC-33 |
| Manufacturer | AutomationDirect |
| Series | FC Series Signal Conditioners |
| Signal Type | 4–20 mA (loop-powered / 2-wire) |
| Function | Galvanic isolation, signal conditioning |
| Input Range | 4–20 mA |
| Output Range | 4–20 mA |
| Isolation Voltage | 1500 V AC (typical) |
| Power Supply | Loop-powered (no external supply required) |
| Mounting | DIN rail (35 mm) |
| Operating Temperature | 0°C to +60°C |
| Weight | 200 g |
| Housing | Compact plastic enclosure |
Why Engineers Specify This Model
- Loop-Powered Design — No auxiliary 24 VDC supply needed; draws power directly from the 4–20 mA loop, simplifying panel wiring and reducing BOM cost
- True Galvanic Isolation — Eliminates ground loops that cause measurement drift and erratic PLC readings
- Drop-In DIN Rail Form Factor — Fits standard 35 mm rails; minimal panel real estate consumed
- Wide Compatibility — Works with any 4–20 mA transmitter and any analog input card regardless of PLC brand
- Proven AutomationDirect Reliability — Backed by AutomationDirect’s engineering support and documented MTBF data
- Cost-Effective — Significantly lower price point than equivalent Phoenix Contact or Pepperl+Fuchs isolators with comparable specs
Complete System Bill of Materials
Typical loop isolation panel assembly using the FC-33:
- FC-33 — Signal conditioner/isolator (this item)
- 35 mm DIN rail section (e.g., AutomationDirect DIN-35C)
- End clamps / rail stops
- 24 AWG shielded twisted-pair cable (field side)
- Terminal blocks (e.g., AutomationDirect ZTB-2.5)
- PLC analog input module (4–20 mA compatible)
- Field transmitter (pressure / temperature / flow / level)
- 24 VDC loop power supply (if transmitter is not self-powered)
Compliance & Industry Standards
- CE Marked — Complies with EU EMC and Low Voltage Directives
- RoHS Compliant — Restriction of Hazardous Substances
- Designed to IEC 61000 EMC immunity standards
- Compatible with ISA-5.1 instrumentation loop documentation practices
Quality Assurance & Sourcing
Konmask.com sources the FC-33 exclusively from verified AutomationDirect-authorized distribution channels. Every unit undergoes incoming inspection including loop-current pass-through verification and isolation resistance check before dispatch. We maintain traceability records for all shipments.
How to Source This Part
- In Stock: Ready to ship from our warehouse — typical lead time 1–3 business days
- Bulk / Project Orders: Contact us for volume pricing and project reservation
- OEM / Integrator Accounts: Net-30 terms available for qualified system integrators
- International Shipping: DHL / FedEx Express to 50+ countries; export documentation provided
- Contact: support@konmask.com | +0086 19859288691
Application-Specific FAQ
Q: Can the FC-33 be used with HART-enabled transmitters?
A: The FC-33 passes the 4–20 mA signal but does not actively support HART communication superimposed on the loop. For HART pass-through, verify loop impedance compatibility with your HART modem.
Q: Does it require an external 24 VDC supply?
A: No. The FC-33 is loop-powered and derives its operating power from the 4–20 mA current loop itself — no auxiliary supply wiring required.
Q: What is the maximum cable length supported?
A: Cable length is limited by total loop resistance. Ensure total loop resistance (cable + load) stays within the transmitter’s compliance voltage specification. Typical installations support runs of 300–1000 m with 24 AWG shielded cable.
Q: Is the FC-33 compatible with intrinsically safe (IS) circuits?
A: The FC-33 is not rated as an IS barrier. For Zone 0/1 hazardous area applications, use a certified Zener barrier or galvanic isolator rated for IS service.
Q: Can I mount multiple FC-33 units side by side?
A: Yes. The compact DIN rail form factor allows dense side-by-side mounting. Verify thermal derating if ambient temperature exceeds 50°C.
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Contact: support@konmask.com | +0086 19859288691
