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S803 Universal Input Bar Graph Display Controller

A universal-input bar graph display controller with intuitive 0–100% LED indication, precise digital readout, and flexible alarm/communication options for comprehensive industrial process monitoring.
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S803 Universal Input Bar Graph Display Controller

S803 bar graph display controller with digital value and 0-100 percent LED bar graph for process monitoring

Dual Display for Two Process Variables

S803 is a digital bargraph display controller designed around “Dual Display for Two Process Variables.” Displays the measured value directly at the process point for easier inspection and commissioning. The local display makes the live value and operating state easier to verify during commissioning, inspection and routine maintenance. The confirmed values highlighted here are 0–100%. The feature is directly relevant to storage tank, automation control and process pipeline projects. Check operating status directly without opening the control system, helping engineers keep the installation, inspection and signal path easier to manage during long-term operation.

S803 universal input bar graph meter for analog RTD and thermocouple sensor signals in industrial applications

Universal Input for Multiple Sensor Types

S803 is a digital bargraph display controller designed around “Universal Input for Multiple Sensor Types.” Provides dependable industrial signal measurement for industrial automation systems. The product is organized around this specific field requirement without adding unrelated functions to the measuring point. The feature is directly relevant to storage tank, automation control and process pipeline projects. Improve measurement clarity and maintenance efficiency in storage tank applications, helping engineers keep the installation, inspection and signal path easier to manage during long-term operation.

S803 bar graph display controller with alarm relay control and optional RS485 communication for industrial equipment

Alarm, Control & Communication in One Display

S803 is a digital bargraph display controller designed around “Alarm, Control & Communication in One Display.” Provides clear switching, alarm or relay functions for equipment control and interlocking. The alarm, relay, switching or control function turns the measured condition into a clear action for pumps, valves, warning devices or equipment interlocks. The confirmed values highlighted here are RS485. The feature is directly relevant to storage tank, automation control and process pipeline projects. Respond faster to abnormal conditions and equipment control demands, helping engineers keep the installation, inspection and signal path easier to manage during long-term operation.

Technical Specifications

Input Signal Compatibility:Universal software-configurable input: 4-20mA / 0-10mA / 0-5V / 1-5V analog signals; Pt100 / Cu50 RTD; K / E / S thermocouples; no jumper or hardware adjustment required


Measurement Accuracy:±0.2% F.S. ±1 digit, full-range temperature compensated


Long-term Drift:≤0.1% F.S. / year; minimal recalibration required for continuous operation


Bar Graph Display:101-segment high-brightness LED bar graph; linearly indicates 0~100% process value; readable from 10+ meters away on the plant floor


Digital Display:4-digit high-contrast red LED display; selectable engineering units and decimal places


Alarm Channels:Single-channel model: 4 independent relay alarm outputs Dual-channel model: 2 relay alarms per channel, 4 total independently configurable outputs


Alarm Modes:Upper limit / lower limit / upper & lower limit / window alarm; freely selectable per channel


Alarm Hysteresis:0.1% ~ 99.9% F.S. fully adjustable per channel; prevents relay chatter from minor process fluctuation


Alarm Delay:0 ~ 999s software adjustable anti-chatter delay; suppresses false triggers from temporary signal spikes and liquid turbulence


Signal Filtering:8-level adjustable digital filtering; balances response speed and reading stability for turbulent process conditions


Zero & Span Calibration:On-site zero migration and full-scale fine-tuning; no precision reference signal source required for routine calibration


Parameter Protection:Password lock function; prevents unauthorized or accidental parameter modification


Non-volatile Memory:All parameters stored in EEPROM; retained permanently after power loss, no backup battery required

Dimension Chart

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Wiring Diagram

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