SY LED6 4-20mA/0-10V Programmable LED Digital Panel Meter

Product Advantage

1. Universal Dual-Mode Input Architecture — One Meter, Every Signal TypeWhere SY LED1–LED3 are dedicated 4–20mA-only meters, the SY LED6 is a universal signal processor that eliminates the need to stock multiple display models for different transmitter types. In two-wire passive mode, it connects in series with 4–20mA current loops and draws operating power from the loop itself — identical to the LED1/LED2/LED3 principle, with minimal loop burden (≤3.2V drop, operating from 3mA minimum). In three-wire active mode, it accepts voltage inputs (0–5V, 0–10V, 1–5V, 0–±200mV) or current inputs (0–20mA) and is powered from an external DC supply at 5V, 12V, 15V, or 24V — selectable at order time through the model code. This dual-mode capability means a single SY LED6 can serve as a local display for PLC analog output modules (0–10V), potentiometer-based position sensors (0–5V), millivolt-output load cells and strain gauges (0–±200mV), and standard 4–20mA transmitters — all with the same physical meter. The use of a plug connector with wire leads (rather than fixed pigtails or screw terminals) enables easy swap-out and reconfiguration without soldering, while the reverse-polarity and over-current protection circuits safeguard against common wiring mistakes during commissioning. For OEM instrument builders, this input universality dramatically simplifies BOM management: one part number covers the display function across an entire product line regardless of the analog signal standard used by each instrument variant.

2. Widest Industrial Temperature Range in the SY LED Family — From Arctic Cold to Desert Heat，The SY LED6 is rated for continuous operation from -40°C to +85°C — a 20°C improvement on the cold end and 15–25°C on the hot end compared to LED1 (-20°C/+60°C), LED2 (-20°C/+60°C), and LED3 (-25°C/+70°C). This -40°C rating is a critical threshold for outdoor instrumentation in continental climates, where winter temperatures in northern China, Russia, Canada, and Scandinavia routinely reach -30°C to -40°C. The full -40°C to +85°C envelope also covers the standard automotive electronics qualification range, making the LED6 suitable for vehicle-mounted and mobile equipment applications. The temperature coefficient of ≤80PPM/°C — while slightly higher than the LED1–LED3's 50PPM/°C due to the wider input signal conditioning front-end — maintains measurement stability across the full operating range without user recalibration. Combined with 20%–90% RH humidity tolerance, compliance with China's Ministry of Electronics Industry Class II shock and vibration standards, and the flame-retardant ABS enclosure, the LED6 delivers field reliability in environments that would disable consumer-grade electronics: unheated pump stations, rooftop HVAC enclosures, offshore platform instrument panels, steel mill control rooms, and desert solar farm monitoring stations.

3. High-Visibility 14.2mm LED Display with Sophisticated Programmability，The SY LED6's 14.2mm (0.56-inch) red high-brightness digits match the SY LED2's size — the largest in the SY LED family — delivering control-room readability at extended distances. The black LED panel with per-segment constant-current driving ensures uniform segment brightness across the entire measurement range, a critical engineering detail that prevents the dim-at-low-signal problem common in simpler voltage-driven LED designs. The 4-digit display supports programmable scaling from -1999 to 9999 with decimal point positioning, automatic polarity indication (minus sign for negative values), and unambiguous over-range diagnostics ("oHH" for over-high, "oLL" for over-low). Sampling at 2.5 times per second provides responsive real-time updates suitable for monitoring dynamic process variables. The CPU-controlled platform stores all configuration parameters — zero point, full-scale, decimal position, damping time, alarm thresholds, alarm direction, and alarm delay — in non-volatile memory, preserving calibration through indefinite power-off periods. The damping function (0–20s, adjustable in 0.5s increments) is particularly valuable for applications with noisy or fluctuating signals such as flow meters with turbulent media, pressure transducers on pump discharge lines, or level sensors in agitated tanks, enabling stable readouts without sacrificing responsiveness.

Technical Parameters

Product Uses

1.Industrial voltage signal monitoring in automation lines: The module is used to display real-time voltage measurements from sensors and transducers outputting 0-5V or 0-10V signals in automated manufacturing lines. Unlike the LED1/2/3 series which only support 4-20mA current loop input, the LED6 accepts a wide range of voltage inputs including 0-5V, 0-10V, 1-5V, and 0-±200mV. The 3-wire active wiring mode with selectable power supply (5V/12V/15V/24V) provides flexibility for integration with existing PLC analog output cards that use voltage signal standards.

2.Dual-mode pressure monitoring with current and voltage transmitters: The module is used to display pressure values from both 4-20mA current-output and 0-10V voltage-output pressure transmitters in the same control panel. The LED6's dual wiring capability allows a single display model to accommodate both signal types — 2-wire passive mode for 4-20mA loop-powered transmitters and 3-wire active mode for voltage-output transmitters. This eliminates the need for inventory of different display models, reducing spare parts management complexity in multi-vendor industrial plants.

3.Bipolar signal measurement in weighing and force sensors: The module is used to display force or weight measurements from strain gauge load cells and force transducers that output bipolar millivolt signals (0-±200mV). The LED6's support for bipolar input ranges, combined with programmable positive and negative display values (-1999 to 9999), makes it ideal for tension-compression force monitoring applications. The red high-brightness 14.2mm LED digits ensure clear readability in industrial environments, while the damping function smooths noisy strain gauge signals for stable display output.

4.Wide-temperature industrial field monitoring in mining and metallurgy: The module is used to display critical process parameters in mining and metallurgical facilities where ambient temperatures vary extremely. The LED6's wide operating temperature range (-40°C to +85°C) significantly exceeds the LED1/2/3 series (-20°C to 60°C or -25°C to 70°C), making it suitable for outdoor installations in cold climates and high-temperature smelting environments. The robust ABS housing and reverse-connection protection ensure reliable operation in harsh industrial fields with frequent maintenance personnel and heavy equipment vibration.

5.PLC and DCS analog signal acquisition display: The module is used as a local signal verification display in PLC and DCS control systems, supporting both voltage and current analog signal standards commonly used in industrial automation. The 72×36mm panel-mount form factor with 68×34.5mm cutout fits standard industrial control panel configurations. The 2.5 times/second sampling rate provides near real-time signal monitoring, while the programmable zero, span, and decimal point settings allow the display to be calibrated to match the exact engineering units of any connected sensor or transmitter.

6.Environmental monitoring with multi-parameter sensor integration: The module is used to display environmental parameters from diverse sensor types — gas detectors outputting 4-20mA, air quality sensors outputting 0-5V, and particulate monitors outputting 0-10V — all within a single monitoring station. The LED6's universal input capability (voltage and current) enables environmental monitoring system designers to standardize on one display model regardless of sensor signal type. The dual-channel alarm outputs with programmable direction and delay can trigger ventilation systems or evacuation alerts when environmental parameters exceed safety thresholds.

7.Medical equipment precision signal display: The module is used to provide high-precision digital readouts in medical and laboratory instruments that transmit analog voltage or current signals from diagnostic sensors. The LED6's support for both unipolar and bipolar input signals (including 0-±200mV for sensitive biomedical sensors) makes it suitable for applications such as patient vital sign monitors, laboratory analytical instruments, and diagnostic equipment. The red high-brightness LED display ensures clear visibility in both brightly lit laboratories and dimly lit imaging rooms. The optocoupler-isolated dual alarm outputs can drive external safety indicators when measured values cross critical medical thresholds.