SELEC TEMPERATURE CONTROLLER TC303

SELEC TEMPERATURE CONTROLLER TC303 – Standard $96\text{ mm} \times 96\text{ mm}$ Digital Process Controller

The SELEC TEMPERATURE CONTROLLER TC303 (commonly supplied under the part code TC303AX) is a high-visibility, single-display industrial temperature controller engineered for reliable process control. Housed in a standard $96\text{ mm} \times 96\text{ mm}$ ( $1/4\text{ DIN}$ ) panel-mount enclosure, it features a large 3-digit, 7-segment LED display ( $21\text{ mm}$ digit height) that provides clear temperature readings from a distance.

Compatible with universal temperature sensors—including J, K, T, R, and S thermocouples as well as 3-wire Pt100 RTD sensors—the SELEC TEMPERATURE CONTROLLER TC303 supports both ON-OFF and Auto-Tuning PID control algorithms. Its single setpoint control output is user-selectable between an electromechanical relay and a $12\text{V DC}$ Solid State Relay (SSR) pulse drive, making it a versatile choice for packaging machines, industrial ovens, and heat-treatment processes.

As shown in the product image, the unit features three tactile front buttons for navigating setup menus, adjusting temperature setpoints, and executing auto-tuning cycles.

Key Features of the SELEC TEMPERATURE CONTROLLER TC303

Large 3-Digit LED Display: Features a high-contrast $21\text{ mm}$ single 7-segment display for clear process monitoring on factory floors.
Universal Sensor Compatibility: Accepts inputs from J, K, T, R, and S thermocouples, alongside 3-wire Pt100 RTD sensors.
Dual Control Algorithms: Offers field-configurable Auto-Tuning PID control for tight thermal regulation or ON-OFF mode with adjustable hysteresis for standard heating/cooling circuits.
Selectable Control Output: Delivers a flexible output supporting either a high-capacity electromechanical relay ( $10\text{A}$ at $250\text{V AC}$ ) or a $12\text{V DC}$ SSR drive output.
Standard $96\text{ mm} \times 96\text{ mm}$ Form Factor: Designed for quick retrofitting into standard panel cutouts ( $92\text{ mm} \times 92\text{ mm}$ ) using panel brackets.
Wide Voltage Supply: Operates reliably across a $90\text{ to }270\text{V AC/DC}$ auxiliary supply range ( $50/60\text{ Hz}$ ).

Common Applications and Industrial Usage

The robust control capability and readable display format of the SELEC TEMPERATURE CONTROLLER TC303 make it an ideal thermal regulator across several industrial applications:

Plastic Processing & Extrusion: Maintains precise barrel temperatures and hot runner system parameters during injection or blow molding.
Packaging & Heat Sealing Equipment: Regulates jaw seal temperatures on vertical and horizontal form-fill-seal (FFS) machines.
Industrial Ovens, Furnaces & Drying Racks: Manages heating element cycles to ensure uniform heat distribution without temperature overshoot.
Water Baths & Food Processing Equipment: Controls pasteurization vats, frying tanks, and hot water baths.

Technical Specifications

The core electrical, mechanical, and operational parameters for the SELEC TEMPERATURE CONTROLLER TC303 are detailed below:

Parameter Specification	Technical Details & Operational Values
Component Classification	Digital Panel-Mount Single Display Temperature Controller
Primary Target Keyword	SELEC TEMPERATURE CONTROLLER TC303
Manufacturer / Model Code	SELEC Controls / `TC303AX`
Display Configuration	3-Digit 7-Segment Single LED Display ( $21\text{ mm}$ Digit Height)
Input Sensor Compatibility	Thermocouple (J, K, T, R, S) & RTD (Pt100)
Control Action Modes	Auto-Tune PID or ON-OFF (Programmable Hysteresis)
Control Output Types	Relay ( $10\text{A}$ @ $250\text{V AC}$ ) or SSR Drive ( $12\text{V DC}, 50\text{ mA}$ )
Measurement Resolution	Fixed $1^\circ$ Resolution
Indication Accuracy	TC (J, K, T): $\pm 0.25\%$ F.S.; RTD (Pt100): $\pm 0.1\%$ F.S.
Sampling Time	$250\text{ ms}$
Auxiliary Power Supply	$90\text{ to }270\text{V AC/DC} \ (50/60\text{ Hz})$
Power Consumption	Max $5\text{ VA}$ @ $230\text{V AC}$
Dimensions / Panel Cutout	$96\text{ mm} \times 96\text{ mm} \times 50\text{ mm}$ / Cutout: $92\text{ mm} \times 92\text{ mm}$
Operating Temp / Humidity	$0^\circ\text{C to }+50^\circ\text{C}$ Max $95\%\text{ RH}$ (non-condensing)

Installation Guidelines and Best Practices

SAFETY NOTICE: Always isolate power supplies before conducting wiring. Use shielded wire for thermocouple or RTD extension cables to prevent electromagnetic noise from causing measurement drift.

Interposing Relay Usage: When controlling high-current heaters via the relay output, install an external contactor or interposing relay to prevent internal contact degradation over time.

RTD Wire Compensation: For 3-wire Pt100 RTD sensors, ensure all three lead wires have equal resistance (less than $5\ \Omega$ per line) to maintain high temperature accuracy.

To review official international IEC standards for measurement, control, and laboratory equipment safety, consult the official IEC 61010-1 Safety Requirements Directory.

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