WYZ-80 Water Level and Temperature Recording Instrument

1. Overview

3D-MEMS silicon capacitive pressure sensors are renowned for their unique high precision, compact size, and ultra-low power consumption. These sensors have an exceptionally low power consumption, making them unparalleled in battery-powered devices.

Utilizing a 3D-MEMS silicon capacitive pressure sensor, the system incorporates microprocessor-based differential calculation, nonlinear correction, and temperature compensation to eliminate the impact of atmospheric pressure changes, achieving high-precision measurement of water level pressure and temperature, as well as storage.

Full 316L stainless steel integrated structure design, waterproof for long-term underwater use. Pressure sensors, air pressure sensors, batteries, and circuits are sealed within the stainless steel housing. φ22mm international standard size, suitable for installation in deep wells and other applications, for long-term monitoring of groundwater, rivers, lakes, reservoirs, and comprehensive utilization of geological disaster forecasting.

2. Features

a. Silicon capacitive absolute pressure sensor based on 3D-MEMS technology, free from zero-point drift upon long-term use.

b. Sensor power consumption: total current consumption at normal operation is 25uA.

c. Integrated water level and temperature measurement, suitable for water level monitoring and comprehensive utilization of geological disasters.

d. Intelligent switching between internal and external power sources

c. Employed 16-bit mixed-signal microprocessor technology for full digital linear and temperature error compensation of the water level sensor, offering high precision and resolution.

d. 64MB high-capacity flash storage, long-term automatic data recording.

e. Flow Range: 10 meters, 20 meters, 40 meters, 70 meters, 100 meters

f. Overload Capacity: Exceeds 10 times the full scale.

g. Operating temperature range: -40~125℃, resolution: 0.01℃, accuracy: ±0.2℃.

3. Operating Principle and Process

Utilizing a new type of silicon capacitive absolute pressure sensor for measurement, the pressure signals of the water depth pressure sensor and the atmospheric pressure sensor achieve higher accuracy and resolution. Both pressure sensors' linear and temperature errors are fully digitized compensated, with compensation parameters stored in non-volatile memory, ensuring data security.

The system activates from sleep mode according to the user-defined collection cycle. The MCU begins operation, and temperature and pressure signals are sent to the MCU for processing via the signal conditioning section, then stored in Flash in a specified format. These data can be read and downloaded using a reader via the RS485 interface. The content of the data includes: static water pressure, static water level, air pressure, temperature, battery voltage, current time, historical data, etc.

Upon completion of water level and temperature data collection and recording, the system re-enters sleep mode, with the MCU and peripheral modules ceasing operation, only the clock module functioning, powered by the battery to maintain clock accuracy. When the set collection interval time arrives, the clock module activates the system to continue collecting and recording. Each time data is read from the interface using the reader, the system clock is corrected to ensure time accuracy.

The power management section handles power consumption to extend battery life, and is responsible for switching to external power when using the reader and back to battery power when disconnected. The protection circuit provides overvoltage protection for the entire system.

4. Performance Parameters

Pressure Sensor - Silicon Capacitive Pressure Sensor Guaranteed Range: 10, 20, 40, 70, 100 mH2O Overload: 10 x FS Accuracy: 0.05% FS Resolution: 0.005% FS Response Time: < 10s Operating Temperature Range: -20 ~ 85℃ Compensation Temperature Range: 0 ~ 50℃ Temperature Sensor - Digital Temperature Sensor Measurement Range: -40 ~ 125℃ Temperature Accuracy: ±0.2℃ Temperature Resolution: ±0.01℃ Clock Accuracy: ±1 minute/year Power Supply: 3.6V AA Lithium Battery or External 8~40V Battery Life: 10 years (1 measurement record/hour) Output Signal: RS485 Digital Interface/MODBUS Storage Type: Flash Memory Capacity: 50,000 data points Sampling Frequency: 1 second ~ 99 hours Set Sampling Mode: Scheduled Sampling or Command-Based Sampling Atmospheric Pressure Compensation - Internal Barometric Pressure Sensor

Note: This product can be equipped with single wire or double wire gas conduit cables; please specify at the time of ordering.