YST820CY10 Integrated Top-Mount Ultrasonic Level Transmitter
| Brand | YST (Dalian Yist) |
|---|---|
| Origin | Liaoning, China |
| Model | YST820CY10 |
| Measuring Range | 0.3–10 m |
| Resolution | ±0.5% of full scale |
| Power Supply | 2-wire 18–30 V DC / 4-wire 85–264 V AC or 18–36 V DC |
| Output Signal | 4–20 mA analog (standard), optional RS-485 digital interface |
| IP Rating | IP66 |
| Operating Ambient Temperature | −20 °C to +60 °C |
| Process Temperature | −20 °C to +80 °C |
| Housing Material | Aluminum alloy |
| Transducer Material | PVDF (optional) |
| Mounting | Top-mounted via threaded or flanged connection |
Overview
The YST820CY10 Integrated Top-Mount Ultrasonic Level Transmitter is an industrial-grade, non-contact level measurement instrument engineered for continuous monitoring of liquid levels in open tanks, sumps, and closed vessels under demanding process conditions. It operates on the principle of time-of-flight ultrasonic pulse echo measurement: a high-frequency transducer emits short-duration acoustic pulses toward the liquid surface; the elapsed time between emission and reception of the reflected echo is precisely measured and converted into distance using the speed of sound in air (temperature-compensated). This distance, subtracted from the known mounting height, yields real-time liquid level data. Designed for reliability in municipal, chemical, food & beverage, and water/wastewater applications, the YST820CY10 integrates transducer, electronics, and display into a single compact housing—eliminating external cabling complexity and reducing installation footprint. Its robust mechanical architecture and embedded signal processing logic ensure stable operation despite variable vapor, foam, condensation, or minor obstructions common in industrial environments.
Key Features
- Integrated top-mount design: Combines transducer, signal processor, power supply interface, and local display in one sealed unit—enabling rapid deployment without separate junction boxes or remote electronics enclosures.
- Intelligent echo processing: Advanced digital filtering algorithms suppress false echoes caused by tank structures, agitator blades, foam layers, or surface turbulence—improving measurement repeatability and minimizing manual commissioning effort.
- Temperature-compensated measurement: Built-in temperature sensor dynamically adjusts sound velocity calculations across the full operating ambient range (−20 °C to +60 °C), maintaining accuracy independent of seasonal or diurnal thermal drift.
- Dual power configuration support: Compatible with both 2-wire loop-powered (18–30 V DC) and 4-wire configurations (85–264 V AC or 18–36 V DC), facilitating integration into legacy control systems or modern low-power fieldbus networks.
- Local human-machine interface (HMI): Backlit LCD display with intuitive three-button navigation supports bilingual (English/Chinese) menu structure, real-time level readout, diagnostic status indicators, and on-device parameter configuration—including damping, blanking distance, and output scaling.
- Corrosion-resistant construction: Aluminum alloy housing rated IP66 provides protection against dust ingress and powerful water jets; optional PVDF transducer face ensures long-term chemical compatibility with mild acids, alkalis, and organic solvents encountered in chemical storage and wastewater treatment.
Sample Compatibility & Compliance
The YST820CY10 is validated for use with clean water, sewage, brine solutions, edible oils, glycols, and other non-volatile, non-foaming liquids where acoustic impedance permits reliable echo return. It is not recommended for highly viscous, aerated, or volatile media that absorb or scatter ultrasonic energy. While not certified to IEC 61508 SIL or ATEX/IECEx for hazardous area use, its IP66 enclosure meets EN 60529 requirements for outdoor and semi-outdoor installations subject to rain, windblown dust, and moderate chemical exposure. The device complies with EMC Directive 2014/30/EU (EN 61326-1) for industrial environments and RoHS 2011/65/EU for restricted substances. For regulated industries, its 4–20 mA output supports analog integration into DCS/PLC systems governed by ISA-84 or IEC 61511 functional safety frameworks when deployed as a non-safety-critical monitoring component.
Software & Data Management
The YST820CY10 does not require proprietary PC software for basic configuration. All setup—including zero/span calibration, damping adjustment, and fail-safe output behavior—is performed locally via the integrated keypad and display. Optional RS-485 Modbus RTU communication enables integration into SCADA or asset management platforms for centralized data logging, trend analysis, and remote diagnostics. When connected to a Modbus master, the device reports live level value, temperature reading, signal strength, echo quality index, and internal fault codes—supporting predictive maintenance workflows. No firmware updates are field-upgradable; configuration changes remain persistent through power cycles. The device stores no historical data internally and does not implement audit trails or user access controls—thus it is not compliant with FDA 21 CFR Part 11 for electronic records in pharmaceutical manufacturing unless paired with validated third-party data acquisition software.
Applications
- Municipal wastewater treatment: Continuous level monitoring in influent channels, equalization basins, and aeration tanks—where resistance to H2S corrosion and foam suppression capability ensure uninterrupted pump staging and flow balancing.
- Chemical bulk storage: Monitoring of intermediate and final product tanks in batch plants, leveraging PVDF transducer option for compatibility with caustic soda, sulfuric acid dilutions, and solvent blends.
- Food & beverage processing: Non-invasive level verification in potable water holding tanks, CIP solution reservoirs, and edible oil silos—meeting hygienic design expectations by eliminating wetted parts and process contact points.
- Agricultural irrigation reservoirs: Outdoor deployment in unsheltered concrete or HDPE tanks, relying on wide temperature tolerance and IP66-rated sealing for year-round operation across temperate climates.
- Industrial cooling tower sumps: Reliable detection of make-up water level under fluctuating ambient humidity and intermittent condensation—enabled by adaptive echo discrimination and thermal compensation.
FAQ
What is the minimum measurable distance and dead zone?
The device has a blind zone (near-field limitation) of approximately 0.3 m—below which accurate echo detection cannot be guaranteed due to transducer ring-down effects. Measurement begins reliably at 0.3 m from the transducer face.
Can this transmitter be used in pressurized vessels?
No. The YST820CY10 is designed exclusively for atmospheric or vented vessels. Pressure differentials exceeding ±5 kPa may compromise transducer performance and void warranty.
Is temperature compensation automatic or manual?
Fully automatic. An integrated Pt1000-class sensor continuously measures ambient air temperature near the transducer and applies real-time corrections to the speed-of-sound calculation.
Does the 4–20 mA output support HART protocol?
No. The analog output is passive and non-smart; it does not embed digital HART signals. RS-485 Modbus RTU is the only digital communication option available.
How is zero and span calibration performed?
Using the local keypad: “Zero” is set when the tank is empty (transducer-to-surface distance = full span); “Span” is confirmed when the tank is filled to a known reference level. Both steps require physical access but no external tools or software.
