Clouds Intelligent Single-Loop Light Column Indicator Controller
4‑20mA / 0‑10V Universal Input | 40‑Segment LED Bar Graph | Multi‑Alarm & RS‑485 Communication
Clouds Intelligent Single‑Loop Light Column Indicator Controller is a high‑performance digital instrument designed for precise measurement, display, and control of industrial process parameters. It integrates a high‑brightness 4‑digit LED numeric display with a 40‑segment LED light column, providing both precise digital readouts and intuitive analog‑style visualization.
With universal input capability and a fully programmable architecture, this controller accepts virtually any industrial sensor signal — including thermocouples, RTDs, standard analog signals (4‑20mA, 0‑10V, etc.), and resistance inputs. It delivers 0.2% F.S. measurement accuracy, supports up to 4 relay alarm outputs, offers isolated analog retransmission, and features RS‑485 communication with MODBUS‑RTU protocol — making it an ideal solution for industrial automation, HVAC, environmental monitoring, and process control systems.
Description
Key Features
| Dual‑Display Design | 4‑digit high‑brightness LED numeric display shows actual measured value; 40‑segment LED light column displays percentage (0–100%) of the measurement range for intuitive trend monitoring. |
| Universal Input (No Jumper Required) | Accepts thermocouples (K, E, S, B, J, T, R, N, etc.), RTDs (Pt100, Cu50, etc.), standard analog signals (4‑20mA, 0‑10mA, 0‑20mA, 0‑5V, 1‑5V, 0‑10V), and linear resistance (0–400Ω). Input type can be changed via simple menu settings without hardware modifications. |
| High Accuracy | Measurement accuracy of ±0.2% F.S. ±1 digit ensures reliable and repeatable readings for critical industrial applications. |
| Multi‑Stage Alarm & Control | Up to 4 independent relay outputs configurable for upper‑upper limit, upper limit, lower limit, lower‑lower limit, or zone‑in/zone‑out alarm modes. Each relay has individually adjustable hysteresis. |
| Analog Retransmission Output | Isolated 4‑20mA, 0‑10V (or 0‑10mA/0‑5V) output proportional to the measured value. Transmitter output accuracy: ±0.3% F.S. with 500Ω load capacity. |
| RS‑485 Communication | Standard MODBUS‑RTU protocol allows seamless integration with PLCs, SCADA systems, and data acquisition networks. RS‑232C option also available. |
| Auxiliary 24V DC Power Supply | Built‑in 24V DC output (up to 30mA / 50mA) powers external 2‑wire or 3‑wire transmitters, eliminating the need for separate loop power supplies. |
| Smart Compensation & Protection | Automatic cold junction compensation for thermocouples and lead‑wire resistance compensation for RTDs. Features include input open‑circuit detection, over‑range indication, power‑fail parameter retention, and parameter password lockout. |
| Optical Isolation | Input, output, power supply, and communication circuits are optically isolated for superior noise immunity and reliability in harsh industrial environments. |
| User‑Friendly Configuration | All parameters are set via front‑panel tactile keys with a password‑protected menu system. Parameter settings are retained indefinitely after power‑off. |
Technical Specifications
General Specifications
| Display Type | 4‑digit 0.56‑inch high‑brightness LED (red) + 40‑segment LED light column (green/red) |
| Display Range | –1999 to 9999 (user‑scalable with adjustable decimal point) |
| Measurement Accuracy | ±0.2% F.S. ±1 digit (optional: ±0.5% F.S.) |
| Light Column Accuracy | ±1% of full scale |
| Sampling Rate | 5 times per second |
| Temperature Compensation | 0–50°C digital automatic compensation |
Input Specifications (Universal Input)
| Thermocouples | K, E, S, B, J, T, R, N (with cold‑junction compensation) | ≥10 MΩ |
| RTDs | Pt100, Cu50, Cu100 (3‑wire connection, lead resistance ≤10Ω per wire) | — |
| DC Current | 4‑20mA, 0‑10mA, 0‑20mA | ≤250Ω |
| DC Voltage | 0‑5V, 1‑5V, 0‑10V (external divider may be required for 0‑10V) | ≥250Ω |
| Linear Resistance | 0–400Ω (for remote pressure gauges, etc.) | — |
Output Specifications
| Relay Output | Up to 4 relays, SPDT (Form C), AC250V / 3A (resistive load), DC24V / 3A |
| Analog Retransmission | Isolated 4‑20mA / 0‑10V / 0‑10mA, load capacity: ≤500Ω (current) / ≥250kΩ (voltage), accuracy ±0.3% F.S. |
| SSR Drive Output | 6–24V / 30mA for driving solid‑state relays |
| SCR Trigger Output | Zero‑crossing trigger pulse for SCR control |
Communication & Power
| Communication Interface | RS‑485 (standard, MODBUS‑RTU) / RS‑232C / RS‑422 (optional), baud rate 300–9600 bps adjustable |
| Auxiliary Power Output | 24V DC ±10%, max 30mA (or 50mA) for external transmitter |
| Main Power Supply | AC 90–265V (50/60Hz) or DC 24V (±10%) optional |
| Power Consumption | ≤5W |
Environmental & Mechanical
| Operating Temperature | 0 to 50°C |
| Operating Humidity | ≤85% RH, non‑condensing (no corrosive gases) |
| Panel Cutout (Horizontal) | 152 × 76 mm (for 160 × 80 mm housing) |
| Panel Cutout (Vertical) | 76 × 152 mm (for 80 × 160 mm housing) |
| Housing Dimensions (H × W × D) | 160 × 80 × 90 mm (horizontal) / 80 × 160 × 90 mm (vertical) — multiple size options available |
| Installation | Flush panel‑mount, plug‑in chassis design for easy maintenance |
| Weight | Approx. <1.0 kg (depending on model) |
Model Selection & Ordering Information
| Model Base | Intelligent Single‑Loop Light Column Indicator Controller |
| Housing Size | A: 160×80mm (horizontal) / B: 80×160mm (vertical) / C: 96×96mm / D: 72×72mm / E: 48×96mm |
| Input Type | Universal Input (specify sensor type or analog signal range) |
| Alarm Outputs | Number of relays: 0 / 1 / 2 / 3 / 4 |
| Analog Retransmission | 0: None / 1: 4‑20mA / 2: 0‑10V / 3: 0‑10mA |
| Communication | 0: None / 1: RS‑485 (MODBUS‑RTU) / 2: RS‑232C |
| Auxiliary Power Output | 0: None / 1: 24V DC / 30mA |
| Main Power Supply | 1: AC 90‑265V / 2: DC 24V |
Key Applications
This versatile indicator controller is widely used in industrial automation and process monitoring across multiple sectors:
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Temperature Monitoring & Control – Furnaces, ovens, kilns, heat treatment systems, plastic/rubber machinery
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Pressure & Differential Pressure – Hydraulic systems, pneumatic systems, filter monitoring, cleanrooms
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Liquid Level Control – Water/wastewater treatment tanks, chemical storage vessels, boiler drums (automatic filling/draining, high/low alarm)
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Flow Rate Indication – Piping systems, dosing applications
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HVAC & Building Automation – Duct static pressure, air handling units, cleanroom pressurization
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Industrial Weighing & Force Measurement – Hopper scales, conveyor belt scales, torque monitoring
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Remote Data Acquisition – Paired with transmitters/sensors in distributed control systems (DCS) or SCADA networks
Industries served include: metallurgy, petrochemical, chemical processing, building materials, papermaking, food & beverage, pharmaceutical, heat treatment, and water/wastewater treatment.
Why Choose This Intelligent Light Column Controller?
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Intuitive Visual Indication – The 40‑segment LED light column provides an at‑a‑glance analog‑style reading, ideal for monitoring liquid levels, tank fill percentages, or any trending parameter. Operators can instantly see whether a value is rising, falling, or approaching a limit without needing to interpret numeric digits.
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Future‑Proof Universal Input – One instrument handles virtually any sensor type. Input changes are made via simple menu settings, not hardware jumpers — significantly reducing spare parts inventory and simplifying field modifications.
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Space‑Saving 2‑in‑1 Design – Combines digital display and analog bar graph in a single 160×80mm or 80×160mm panel cutout, freeing up valuable control panel real estate.
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Reliable in Harsh Environments – Optically isolated circuits and advanced noise immunity ensure stable operation even near VFDs, contactors, and other industrial noise sources.
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Complete Control Package – Built‑in alarms, analog retransmission, and MODBUS communication eliminate the need for separate signal conditioners, PLC I/O modules, or standalone annunciators.
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Easy Installation & Maintenance – Standard plug‑in chassis design allows the internal electronics to be removed without disconnecting field wiring.
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Cost‑Effective – Reduces hardware, wiring, and panel space compared to separate digital indicators, bar graph meters, and alarm units.
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OEM / Customization Available – Logo printing, custom packaging, and special calibration ranges available for qualified orders (MOQ applies).
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