Level Indicator

• Dual visual display: 4-digit LED digital readout + 40-segment adjustable brightness light column, vertical/horizontal housing optional
• 22 kinds of universal sensor input signals, compatible with all mainstream liquid level transmitters
• Max 4 independent programmable relay outputs, matched with 4–20mA analog transmission and RS485 Modbus RTU communication
• Built-in short-circuit protected 24VDC sensor power feed, no extra external power supply required
• 0.2%FS high measurement precision, 5/s fast sampling to suppress dynamic liquid level signal jitter
• Dual power supply (AC/DC 86–265V / DC24V), wide temperature range for complex industrial environments

The Digilever 9520 & 9521 LED light column level indicators serve as dedicated on-site panel display and control hubs matched with all types of liquid level transmitters, sensors and probes. Different from single measuring sensors that only collect signals, this dual-display meter realizes intuitive local visualization, high/low level interlock alarm and remote data upload in one unit, widely deployed for real-time tank monitoring and automatic fluid control across multiple industrial sectors.

1.Chemical & Fine Chemical Storage Tank Area

Compatible with radar, pressure and float level sensors commonly used in chemical workshops. The 40-segment LED light column enables staff to quickly judge liquid filling status from a distance, while 4 programmable relay contacts trigger high-level overflow protection and low-level pump stop interlock. Support thermocouple and Pt100 temperature signal synchronous input to realize integrated monitoring of medium liquid level and temperature inside reaction kettles and buffer tanks.

2.Water & Wastewater Treatment Plants

Installed on central control cabinets of sedimentation tanks, sludge pools and dosing tanks. Built-in 24VDC power supply directly drives on-site level probes without additional power modules; fast 5Hz sampling effectively stabilizes fluctuating readings caused by water flow impact. RS485 Modbus RTU outputs level data to centralized PLC system for automatic water supply and drainage regulation.

3.Power Generation & Energy Equipment Rooms

Fit for boiler feed water tanks, fuel oil storage vessels and condensate tank monitoring. Dual wide voltage power supply (AC/DC 86–265V) adapts to unstable power grids in power workshops. Multi-channel relay outputs cut off fuel supply and send sound-light alarms once liquid level exceeds safe threshold to avoid equipment idle burning risks.

4.Food, Beverage & Pharmaceutical Sterile Production Lines

Sanitary process tanks equipped with Pt100 and 4-20mA hygienic transmitters can connect directly to this indicator without signal converters. Adjustable LED brightness ensures clear reading under bright workshop lighting, independent level alarm logic prevents raw material overflow and production line shutdown losses. Vertical and horizontal panel sizes flexible match compact and large control cabinet layout demands.

5.Environmental Protection & Municipal Fluid Storage Facilities

Applied in underground sewage tanks, chemical agent storage containers and rainwater recycling pools. Wide ambient temperature tolerance (-40℃ to 60℃) supports installation in outdoor unattended control cabinets. Short-circuit protection of built-in sensor power supply reduces field equipment failure rate for long-term unmanned operation.

Core On-Site Functional Scenarios

• Long-distance visual liquid level observation via segmented LED light column without close inspection
• Multi-point high/low liquid level alarm and pump/valve automatic interlock through multi-way relay outputs
• Synchronous collection of liquid level, temperature and resistance sensor signals with one single panel meter
• Real-time liquid data remote transmission to DCS/PLC via 4-20mA analog and Modbus digital dual signals
• Centralized display for multiple storage tanks to simplify workshop cabinet wiring and auxiliary equipment configuration

All Digilever 9520/9521 series light column level indicators are manufactured under standardized industrial circuit testing procedures, with strict calibration of measurement accuracy, relay load capacity and communication stability before factory delivery to guarantee consistent performance for long-term industrial operation.

1.Precision Performance Assurance

Each unit undergoes full-scale calibration to guarantee 0.2%FS measurement accuracy and 0.5%FS transmission accuracy; high-speed 5Hz sampling chip effectively suppresses signal jitter caused by liquid surface turbulence, ensuring stable and repeatable level data output.

2.Circuit Safety Protection Warranty

Built-in precision regulated 24VDC sensor power module with automatic short-circuit cut-off function to avoid burnout of external level sensors and internal mainboard; all relay circuits adopt overload isolation design to extend service life under long-time frequent switching.

3.Complete Signal Compatibility Standardization

The product supports 22 types of mainstream industrial input signals, and all signal conversion programs are solidified and verified in factory, ensuring zero signal distortion when matched with thermocouples, thermal resistors and standard current/voltage transmitters of various brands.

4.Housing & Environmental Adaptability Guarantee

Two standardized embedded panel dimensions (vertical 80×160mm / horizontal 160×80mm) comply with global general industrial cabinet cutout standards. Internal components pass wide temperature aging test, reliable operation within -10℃~50℃ working temperature and safe storage from -40℃ to 60℃.

5.Complete Technical Support & After-Sales Service

We provide complete model selection guidance, wiring diagrams and parameter setting manuals for all clients. For engineering projects with customized alarm thresholds and special communication parameters, our technical team offers free configuration guidance and remote debugging support. All meters come with complete factory test reports to support project acceptance inspection.

Q1: What are the core advantages of this dual-display level indicator compared with single digital display meters?

A: This series integrates a 4-digit precise digital readout and a 40-segment analog LED light column at the same time. Operators can roughly judge tank filling volume from dozens of meters away via the light column, while the digital screen provides accurate numerical data for precise recording. The LED brightness is fully adjustable to solve unclear reading problems in strong light or dim workshop environments, which single digital meters cannot achieve.

Q2: What level sensors can this indicator connect to directly?

A: It supports matching all mainstream liquid level measuring equipment on the market, including guided wave radar, magnetic float transmitters, pressure level sensors, float level switches, etc. It is compatible with 22 kinds of input signals such as 4-20mA, Pt100, multiple thermocouples and resistance signals, no extra signal isolators or converters required to save system investment cost.

Q3: What is the difference between Digilever 9520 and 9521 models? How to choose the right size?

A: The two models are identical in internal circuit, signal compatibility and output functions, only differing in panel installation size: Digilever 9520 is vertical 80×160mm for narrow vertical cabinets, with cabinet cutout size 76×152mm; Digilever 9521 is horizontal 160×80mm, suitable for wide horizontal control cabinets, cutout dimension 92×92mm. Select the model according to the reserved hole size of your on-site cabinet.

Q4: Can this indicator supply power to external level sensors?

A: Yes. It integrates a built-in precision regulated DC24V/50mA feed output specially for powering external level transmitters. Independent short-circuit protection circuit will automatically disconnect the power supply once overload or short circuit occurs, effectively protecting both the meter and connected probes.

Q5: What control and transmission outputs does the level indicator provide?

A: It supports multi-layer signal output to meet different automation demands: up to 4 programmable relay contacts (AC250V 7A load) for on-site pump/valve interlock alarm; 0-20mA/4-20mA/0-10V analog signal for secondary instrument connection; RS485 Modbus RTU digital communication for remote data uploading to PLC/DCS central control system.

Q6: What power supply options are available for on-site installation?

A: Two power supply versions are optional. The universal wide voltage model supports AC/DC 86~265V, adapting to workshops with unstable grid voltage; the DC24V low voltage version is applicable to explosion-proof cabinets and intrinsic safety loop control systems.

Q7: Is complex calibration required during long-term use?

A: Routine frequent calibration is not needed. The built-in high-precision sampling chip maintains stable measurement performance for a long time. Only regular inspection is recommended for key production and high-precision measurement scenarios every 1-2 years to ensure data accuracy.

Q8: Can the meter work normally in high temperature and cold outdoor cabinets?

A: The working ambient temperature range of the main unit is -10℃ to 50℃; storage temperature can reach -40℃ to 60℃. It can be installed in semi-outdoor control cabinets with heat preservation or ventilation devices, avoid direct long-time exposure to extreme high temperature sunlight without protection.

If you need to match this Digilever 9520/9521 LED light column level indicator with your existing level sensors, or require customized alarm threshold settings, special signal matching and cabinet installation scheme guidance, please send us your detailed on-site working conditions, input signal types and cabinet size requirements. Our professional engineering team will provide targeted model selection suggestions, complete wiring instructions and competitive quotations for your industrial level monitoring project.

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