Samsung SMTB-RTD RTD/TC Terminal Board
Samsung SMTB-RTD RTD/TC Terminal Board is a specialized temperature-measurement interface module engineered for industrial process monitoring and thermal control systems. It acts as an intermediary signal-conditioning terminal between field temperature sensors (Resistance Temperature Detectors and Thermocouples) and central PLC/DCS controllers, ensuring linear, low-noise signal conversion and isolation in high-temperature industrial environments.
Technical Parameter List
| Parameter | Specification |
| Model Code | SMTB-RTD |
| Supported Sensors (RTD) | Pt100, Pt1000, Cu50, Cu100 (2-wire, 3-wire, 4-wire) |
| Supported Sensors (TC) | Type J, K, T, E, R, S, N, B Thermocouples |
| Channels | 8 / 16 Dedicated Temperature Input Channels |
| Cold Junction Compensation (CJC) | Integrated on-board Precision Temperature Sensor |
| Isolation Barrier | Galvanic Isolation (1500 V AC, 1 minute) |
| Measurement Accuracy | RTD: ±0.1°C / Thermocouple: ±0.5°C |
| Conversion Resolution | 16-bit Sigma-Delta ADC |
| Power Supply | 24 V DC (±10%) |
| Wiring Connection | Screw-cage / Push-in Terminal Blocks |
Core Advantages & Product Features
Dual Sensor Compatibility: Supports both RTD resistance inputs and Thermocouple millivolt signals on one hardware platform.
On-Board Cold Junction Compensation (CJC): High-precision internal temperature reference compensates for ambient terminal variation during Thermocouple operations.
3-Wire & 4-Wire Lead Resistance Cancellation: Automatically compensates for sensor wire resistance to maintain measurement accuracy over long field cable runs.
High Noise Rejection: Custom filtering circuitry eliminates 50Hz/60Hz grid hum and high-frequency interference generated by nearby VFDs and industrial heaters.
Sensor Break & Burnout Detection: Triggers safety logic flags automatically if a sensor lead ruptures or disconnects.
Model Classification
SMTB-RTD: Dedicated Temperature Sensor Interface (RTD & Thermocouple inputs).
SMTB-AI: Standard Analog Input Terminal Board (4–20 mA / 0–10 V DC signals).
SMTB-AO: Standard Analog Output Terminal Board (Proportional control outputs).
SMTB-DI / DO: Discrete Digital Input and Output Interface Boards.
Environmental Tolerance Conditions
Operating Temperature: -10°C to +60°C (14°F to 140°F)
Storage Temperature: -25°C to +70°C (-13°F to 158°F)
Relative Humidity: 5% to 95% RH (Non-condensing)
Vibration Resistance: Conforms to IEC 60068-2-6 (10–57 Hz @ 0.075 mm, 57–150 Hz @ 1 g)
Enclosure Protection: IP20 rating (Intended for mounting inside IP54 control enclosures)
Installation Method
Mounting: Snap the bottom latch of the SMTB-RTD onto a standard 35 mm DIN rail (EN 50022) inside an industrial control panel.
Sensor Wiring:
For 3-wire RTDs: Connect sensor wires to terminals A, B, and b as marked on the wiring schematic.
For Thermocouples: Ensure correct polarity (+ red / – blue or standard color codes) using dedicated thermocouple extension wire.
Shield Connection: Terminate overall cable shielding at the terminal board ground point (FG) only; keep the sensor end ungrounded to prevent ground loops.
Torque Specification: Tighten terminal screws to 0.4–0.5 Nm.
Operating Instructions
DIP Switch / Software Setup: Set the hardware jumper or PLC channel configuration to select between RTD types (Pt100 vs. Pt1000) or TC thermocouple types before powering on.
Cold Junction Equilibrium: Allow the panel to reach thermal stability (approx. 15–20 minutes after powering up) to ensure CJC accuracy for thermocouple channels.
Calibration Verification: Verify temperature readings annually using a calibrated decade box (for RTD) or thermocouple calibrator.