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FDC-C21 - 1/32 DIN Temperature Controller by Future Design Controls
Part Number / SKU

C21

Configure additional options

Power Input
Signal Input
Output 1
Output 2 / Alarm
Communications
Display Color

The C Series (C21 & C91) PID temperature and process controllers are engineered for OEMs and industrial automation applications that demand reliability, precision, and cost efficiency. Built with universal thermocouple and RTD inputs, fast scan rates, and fuzzy logic auto-tuning, the C Series delivers world-class control performance in a compact, DIN-mountable package.

Cost-Effective

High Performance Without the Price Tag!

Easy to Use

Simple Set-Up and Use

Short Lead Times

Average Days to Ship 2-3 Business Days

Available in 1/32 and 1/16 DIN sizes, the controllers offer up to three control outputs plus RS232/RS485 Modbus communications. With a 3-year warranty, the C Series sets a standard for high-resolution input measurement, flexible outputs, and robust OEM integration.

 

Key Features

Power Input

  • Standard: 90–264 VAC, 50/60 Hz
    • Optional: 11–26 VAC / 11–36 VDC

Input Performance

  • Input sample rate: 5 scans per second
    • Input resolution: 18-bit (262,144 counts)
    • Universal inputs: Thermocouple & RTD (linear mA/VDC available as special order)

Control Outputs

  • Up to 2 isolated PID control outputs (If using 2, OUT1 = PID Heat / OUT 2 = PID Cool)
    • Output options:
    – Relay: 2A/240 VAC resistive
    – SSR driver: 5 VDC/30 mA or 14 VDC/40 mA
    – Triac: 1A/240 VAC
    – 4–20 mA / 0–20 mA
    – 1–5 VDC, 0–5 VDC, or 0–10 VDC

Alarm Functions

  • One alarm when Output #2 configured as Alarm #1
    • Relay Form A 2A/240 VAC resistive
    • Configurable logic: process, deviation, and band alarms with latching/non-latching options

Communications

  • Modbus RS232 or RS485
    • Analog retransmission (mA or VDC) available
    • Note: Communication and Control Output #2 are mutually exclusive on C91

Operator Flexibility

  • Proprietary SEL Function: up to 8 key parameters (P, I, D, cycle, deadband, etc.) can be displayed sequentially
    • Configurable Alarm Logic: ramp/soak segment, timer function, Auto/Manual control, bumpless transfer
    • Setpoint Ramp & PV Shift: for stable and precise process control

Design & Reliability

  • NEMA-4X / IP65 rating (C21 standard; C91 requires optional splash guards)
    • Shallow mounting depth for tight panel installations
    • 3-Year Warranty – ensuring long-term performance and OEM confidence

Why Choose the C Series PID Controller?

  • OEM-Ready: Compact DIN sizes and flexible configuration make integration simple
    • High Accuracy: 18-bit resolution ensures precise process measurement
    • Fuzzy Logic Auto-Tune: Faster setpoint response with minimal overshoot
    • Versatile Outputs: Supports relay, SSR, Triac, mA, and VDC outputs
    • Industrial-Grade Reliability: Designed for demanding applications in plastics, packaging, ovens, furnaces, food & beverage, and more