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LPT-15 Submersible Level Transmitter
● Integrated design with excellent sealing performance
● Multiple output signals available
● Supports HART protocol (please specify when ordering)
●Isolated Circuit Design
● Dedicated gas-conducting cable
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Product Description
Product Overview Product overview
The LPT-15 series submersible level transmitters are designed based on the principle that pressure is directly proportional to liquid level height. The calculation formula is P = ρgh (where ρ represents density, and g—the gravitational acceleration—is a known constant), clearly demonstrating that liquid level and the pressure generated by the liquid column maintain a direct proportional relationship. Essentially, this product line consists of standard pressure transmitters that have undergone waterproof sealing treatment. After the measured liquid level data is processed through circuitry, it is output as either a 4–20mA signal or a Modbus RTU RS-485 communication signal, enabling seamless data acquisition, display, and control by downstream systems. Thanks to their outstanding reliability, flexibility, and versatility, these transmitters are widely used in industrial applications such as water supply, heating systems, oil production, chemical processing, metallurgy, power generation, and hydrological monitoring—providing precise and dependable liquid level measurement and control in real-world process environments.
Performance Metrics TECHNICAL PARAMETERS
Power supply: 18–32 VDC;
Measurement media: oil, water, solvents
Measurement range: 0–5000 mm H2O (higher requirements can be customized)
Measurement accuracy: 0.25%FS; (Higher accuracy available upon customization)
Overload Capacity: 2x Range:
Output signal: Two-wire 4-20mA; three-wire voltage output: 0-5V, 1-5V, 0-10V;
Communication methods: 4-20mA + HART protocol; RS485;
Load capability: Current type ≤ 500Ω, voltage type ≥ 250 kΩ;
Threaded connection: G1 or flange (customizable according to site requirements);
Electrical interface: Direct wiring, standard M20×1.5 outlet hole with locking nut included;
Temperature Drift Coefficient: Within the specified operating temperature range, for every 10°C change in ambient temperature, the output variation is ≤ ±0.05% of the full scale; annual drift < ±0.3%.
Long-term stability: ±0.1%FS/year;
Housing material: Die-cast aluminum, with epoxy resin coating and sealed gasket.
Housing Protection: IP65
Explosion-proof rating: Exd IIC T6Gb;
Operating temperature: -20～85°C
Storage temperature: -40～100°C
Relative humidity: 0–95% RH
External dimensions APPEARANCE OF SIZE
Materials are being prepared...
Installation Requirements INSTALLATION
1. The pressure transmitter can be directly installed on the pipe component to be measured. For ease of installation and maintenance, it is recommended to install a shut-off valve between the pipe component and the pressure transmitter. In environments with significant vibration or shock, a flexible hose can be connected to the pressure transmitter’s fitting to achieve mechanical decoupling.
2. A sealing ring should be installed between the pressure transmitter connector and the pipe fitting or shut-off valve. For flush-head pressure transmitters, the internal thread depth of the pipe fitting or shut-off valve must exceed 25 mm.
3. In general, the pressure transmitter should be installed vertically facing upward relative to the horizontal plane. During installation, use a wrench to tighten the transmitter by turning the hexagonal nut at its base—avoid directly twisting the upper part of the transmitter.
Note:
1. Do not poke the pressure port with sharp or hard objects, as this may damage the sensor’s pressure diaphragm. Since the pressure diaphragm is permanently integrated with the housing, it will become irreparable if damaged. Additionally, product quality issues caused by improper use—such as accidental pressing of the diaphragm, static overloading from particulate-containing media, or dynamic pressure surges—are not covered under our warranty. Therefore, users are strongly advised to take extra care in protecting the diaphragm during both installation and operation.
2. For areas prone to frequent lightning strikes, it is recommended to install lightning protection devices along the lines.
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Tianjin Ling Yu Technology Co., Ltd.
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Fax: 022-58285528
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Factory Address: No.5 Yingbin Road, Xiqing District, Tianjin
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