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LPT-21 Precision Small Differential Pressure Transmitter
● High-quality diffused silicon piezoresistive sensing element
● Supports 4-20mA + RS485 protocol (please specify when ordering)
●Isolated Circuit Design
● Features high static pressure and high overpressure capabilities
● Supports software PV reset
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Product Description
Product Overview Product overview
The LPT-21 series miniature differential pressure transmitter is a rod-shaped differential pressure transmitter, and Industrial-grade pressure transmitter Comparison reveals that the working principle remains the same. Its key feature is its compact size, making it ideal for integration into equipment and allowing for dense installation. Internally, it is sealed with a flexible solid encapsulant, enhancing its vibration resistance. This product is widely used in industries such as refrigeration systems, heat exchange equipment, water treatment systems, hydraulic stations, and lubrication stations. Additionally, the product supports the MODBUS protocol and includes预留接口for future development, enabling seamless integration with complementary devices and helping to expand functionality while optimizing the overall system performance.
Performance Metrics TECHNICAL PARAMETERS
Power supply: 12–32 VDC;
Measurement media: oil, water, gas, and other media compatible with stainless steel;
Measurement range: 0–0.02–2.5 MPa; (higher requirements can be customized)
Measurement accuracy: 0.25%FS; (Higher accuracy available upon request)
Overload Capacity: 2x Full-Scale Pressure:
Single-tube hydrostatic pressure: 10 MPa;
Output signal: Two-wire 4-20mA; three-wire voltage output: 0-5V, 1-5V, 0-10V;
Communication method: RS485;
Load capability: Current type ≤ 500Ω, voltage type ≥ 250 kΩ;
Threaded interface: G1/4; M20×1.5 (customizable based on site requirements);
Electrical interface: Hirschmann waterproof cable glands with locking nut; M12 aviation connector for cable exit
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
Differential Pressure Transmitter Dimension Drawing
Installation Requirements INSTALLATION
1. The pressure transmitter can be directly installed onto the pipe component being measured. To facilitate 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 bottom, avoiding direct twisting of 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. Additionally, since the pressure diaphragm is permanently integrated with the housing, it will become irreparable if damaged. Furthermore, product quality issues caused by improper use—such as accidental pressing of the diaphragm, static overloading due to particulate matter in the medium, 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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