GreenPrima PROLEV500/500D Split-Type Ultrasonic Level Transmitter

Overview

The GreenPrima PROLEV500/500D is a high-performance split-type ultrasonic level transmitter engineered for reliable, non-contact measurement of liquid and solid bulk material levels in industrial process environments. Utilizing time-of-flight (ToF) ultrasonic pulse-echo principle, the system emits high-frequency acoustic waves (typically 40–60 kHz) from a remotely mounted sensor, which reflect off the surface of the measured medium and return to the transducer. The microprocessor-based transmitter calculates distance based on the precise transit time, compensating dynamically for ambient temperature variations using integrated thermal sensing. Its split architecture—comprising a field-mounted ultrasonic sensor and a panel-mounted controller—enables flexible installation in confined, hazardous, or thermally demanding locations where conventional integrated units cannot be deployed. Designed for continuous operation under variable process conditions, the PROLEV500/500D delivers stable output signals compliant with standard industrial automation interfaces.

Key Features

• True split configuration: Sensor and transmitter are physically separated, allowing independent mounting—ideal for high-temperature vessels, pressurized tanks, or corrosive atmospheres.
• Intelligent signal processing: Adaptive gain control, automatic power adjustment, and real-time temperature compensation ensure consistent echo detection across changing media density, foam, vapor, or dust layers.
• Advanced echo discrimination: Built-in false-echo suppression algorithms filter out interference from tank walls, agitators, ladders, or internal structures—critical for accurate level determination in complex geometries.
• Dual analog outputs (4–20 mA) with HART-compatible scaling, plus Modbus RTU over RS-485 for integration into DCS, SCADA, or PLC systems without additional gateways.
• Two programmable SPDT relays support local alarm, pump control, or high/low level interlocks—fully configurable via front-panel navigation or remote software.
• Sensor options with ETFE or PVDF diaphragms provide chemical resistance suitable for aggressive media including acids, alkalis, solvents, and food-grade slurries; IP68-rated housing ensures submersion resilience.

Sample Compatibility & Compliance

The PROLEV500/500D is compatible with a broad spectrum of process materials—including water, wastewater, oils, polymers, granular solids (e.g., cement, plastic pellets), and powdered commodities—provided the surface exhibits sufficient acoustic reflectivity. It is not recommended for highly absorptive or vacuum environments, nor for media generating excessive foam or heavy condensation without supplementary mitigation (e.g., stilling wells or guided wave radar backup). The transmitter conforms to IEC 61000-6-2 (immunity) and IEC 61000-6-4 (emissions), meets EMC Directive 2014/30/EU, and carries CE marking. Its dual 4–20 mA outputs comply with NAMUR NE43 standards for fault signaling. While not intrinsically safe by default, explosion-proof enclosures (ATEX/IECEx) are available as optional configurations upon request. The device supports audit-ready operation under GLP/GMP frameworks when paired with validated configuration logs and change-control documentation.

Software & Data Management

Configuration and diagnostics are performed locally via the backlit LCD interface or remotely using GreenPrima’s Windows-based PC utility (PROSoft v3.x), which enables full parameterization—including damping, damping filters, echo curve visualization, relay hysteresis, and unit conversion (mm/m/%/ft). All configuration changes are timestamped and stored in non-volatile memory. The Modbus RTU protocol supports read/write access to all operational registers (e.g., current level value, temperature, signal strength, error codes), enabling seamless data logging and predictive maintenance workflows. Firmware updates are delivered via USB or serial connection, with version rollback capability to ensure system integrity during validation cycles. No cloud dependency or proprietary subscription model is required—data remains fully under end-user control.

Applications

• Municipal and industrial wastewater treatment plants: Monitoring influent/effluent sumps, clarifier sludge blankets, and chemical dosing tanks.
• Drinking water distribution: Level control in clearwells, elevated reservoirs, and booster station wet wells.
• Food & beverage processing: Non-contact measurement of syrups, dairy products, grains, and starch slurries—meeting FDA-compliant material requirements (ETFE/PVDF sensors).
• Chemical manufacturing: Inventory tracking in storage tanks containing caustic soda, sulfuric acid, or organic solvents—leveraging corrosion-resistant sensor housings.
• Power generation: Condensate tank and ash hopper level monitoring in coal- and biomass-fired facilities.
• Aggregates and mining: Silo and conveyor feed bin level supervision for cement, limestone, and fly ash.

FAQ

What is the maximum allowable distance between the sensor and transmitter?
The standard sensor cable length is 10 meters (included); custom lengths up to 50 m are available with signal integrity verification and optional shielded twisted-pair cabling.

Can the PROLEV500D measure differential level between two points?
Yes—the PROLEV500D variant includes dual-sensor input capability and computes level difference (ΔH) with synchronized sampling, supporting applications such as weir flow estimation or tank tilt monitoring.

Is the transmitter suitable for outdoor installation in direct sunlight?
The IP65-rated enclosure resists dust and water jets, but prolonged UV exposure may degrade the LCD polarizer; use of a sunshade or cabinet mounting is recommended for long-term outdoor service.

Does the device support SIL2 functional safety certification?
The base model is not SIL-certified; however, GreenPrima offers a certified SIL2 variant (PROLEV500-SIL) with redundant hardware architecture and TÜV-approved firmware for safety-critical shutdown loops.

How is temperature compensation implemented?
An integrated Pt1000 sensor in the transmitter measures ambient air temperature; the algorithm applies a linear speed-of-sound correction factor (331.3 + 0.606 × T_°C m/s) to the raw time-of-flight value, ensuring accuracy within ±0.2% FS across the full operating range.