GreenPrima PROLEV200 Plus Ultrasonic Level Transmitter

Overview

The GreenPrima PROLEV200 Plus is a high-performance, microprocessor-based ultrasonic level transmitter engineered for non-contact continuous level measurement in industrial process environments. It operates on the principle of time-of-flight (ToF) ultrasonic pulse echo measurement: a transducer emits a short-duration ultrasonic burst toward the surface of the medium; the elapsed time between transmission and reception of the reflected echo is precisely measured and converted into distance using the speed of sound in air—compensated in real time for ambient temperature. This physics-based methodology ensures consistent, repeatable performance across diverse media—including corrosive liquids, slurries, granular solids, and powders—without physical contact, eliminating wear, fouling, or calibration drift associated with intrusive sensors.

Key Features

• Intelligent signal processing with adaptive gain control and automatic power adjustment to maintain optimal signal-to-noise ratio under varying acoustic conditions (e.g., foam, vapor, dust, condensation).
• Real-time temperature compensation via integrated Pt1000 sensor, correcting for sound velocity variations across the full operating range (−30 to +70.0 °C).
• Advanced echo processing algorithm incorporating dynamic interference suppression, enabling reliable detection of true material surfaces even in presence of false echoes from tank walls, agitators, or internal structures.
• High-resolution measurement output with 1 mm digital resolution and ±0.2% full-scale accuracy—validated per IEC 61298-2 for level measurement devices.
• Robust housing constructed from impact-resistant polycarbonate/polypropylene (PC/PP), rated IP67 for dust-tight and temporary water immersion protection.
• Chemically resistant ultrasonic transducer element sealed with ETFE or PVDF diaphragm—suitable for aggressive media including acids, alkalis, solvents, and food-grade applications compliant with FDA 21 CFR §177.2420 and EU Regulation (EC) No. 1935/2004.

Sample Compatibility & Compliance

The PROLEV200 Plus is certified for use with both liquid and solid bulk materials in open channels, closed vessels, and silos. Its non-contact design eliminates compatibility concerns related to conductivity, dielectric constant, density, or viscosity—making it suitable for wastewater, potable water, chemical storage tanks, grain silos, and food processing hoppers. The device complies with electromagnetic compatibility standards EN 61326-1 (industrial environment) and meets RoHS Directive 2011/65/EU. While not intrinsically safe, its low-power 24 VDC operation and absence of spark-prone components permit deployment in non-hazardous zones. For installations requiring ATEX certification, GreenPrima offers the PROLEV300 Plus variant (ATEX II 1/2G Ex ia II C T6).

Software & Data Management

Configuration and diagnostics are performed locally via intuitive LCD interface with four-button navigation or remotely via HART-compatible handheld communicators (e.g., Rosemount 375/475). All parameter settings—including damping, empty/Full calibration points, fail-safe output mode, and echo profile visualization—are stored in non-volatile memory. Audit trails of configuration changes are retained for GLP/GMP traceability. The 4–20 mA analog output is linearized against level height and supports NAMUR NE43 fault signaling (20.5 mA = sensor fault, 3.8 mA = under-range). Optional firmware upgrades—distributed via GreenPrima’s secure engineering portal—enable field adaptation to evolving process requirements without hardware replacement.

Applications

• Water & Wastewater: Monitoring influent/effluent levels in clarifiers, wet wells, and reservoirs—supporting pump control logic per ISO 5807 and EN 14113.
• Food & Beverage: Level verification in stainless-steel mixing tanks, syrup vats, and grain elevators—meeting hygiene design criteria per EHEDG Doc. Type A and 3-A Sanitary Standards.
• Chemical Processing: Interface-level detection in dual-phase reactors and inventory management in solvent storage—compatible with ISA-88 batch control modules.
• Civil Infrastructure: Real-time flood warning systems in stormwater overflows and irrigation canal monitoring per ISO 4064-3.

FAQ

What is the minimum measurable distance (blind zone) for the PROLEV200 Plus?
The blind zone is 0.25 m at 6 m range and 0.5 m at 10 m range—defined as the near-field region where transmitted energy overlaps with echo reception window.
Can this transmitter operate reliably in high-humidity or condensing environments?
Yes—its ETFE/PVDF transducer diaphragm resists moisture ingress, and the internal temperature compensation algorithm corrects for humidity-induced sound velocity shifts up to 95% RH.
Is third-party calibration documentation available?
Each unit ships with a factory calibration certificate traceable to UKAS-accredited standards (ISO/IEC 17025), including raw echo data, temperature correlation curves, and linearity verification report.
How is the 4–20 mA output configured for fail-safe behavior?
Users may select “up-scale” (22 mA) or “down-scale” (3.6 mA) alarm modes via DIP switch or software; output reverts to preconfigured fault value upon loss of echo, power interruption, or internal error.
Does GreenPrima provide technical support for integration with DCS/SCADA systems?
Yes—application engineers supply protocol-specific configuration guides for Siemens PCS7, Emerson DeltaV, Honeywell Experion, and Rockwell Automation systems, including Modbus RTU mapping tables and HART device description (DD) files.