Torque Balance OEM Pressure Transmitter Hart Protocol Remote Controlled
The Torque Balance Pressure Transmitter Can Be Remotely Controlled Without An External Power Supply
The torque balance pressure transmitter is a classic and mechanical pressure measurement and remote transmission device. It uses levers, balance weights and electromagnetic feedback systems to proportionally convert the input pressure signal into a standard 4-20mA DC current signal output.
- High reliability and environmental adaptability: The pure mechanical structure is robust, resistant to vibration, radiation, and high temperatures, and can still be applied in extreme environments such as nuclear power plants.
- Intrinsic two-wire system: It is naturally a two-wire 4-20mA output and does not require additional power supply.
- Wide range adjustment: By moving the range pivot (range wheel) on the lever, the range ratio can be significantly adjusted (up to 10:1 or more), providing good on-site adaptability.
- Stable zero point: The mechanical balance system has a stable zero point with minimal long-term drift.
- No external power supply required (for the sensor itself): The force balance principle itself does not require power, but the amplifier does. The overall system remains a two-wire power supply.
| Characteristics | Mechanical Lever and Electromagnetic Force Balance Transmitter | Modern Intelligent Transmitters (such as piezoresistive/resonant) |
|---|---|---|
| Core Principle | Mechanical lever and electromagnetic force balance | Solid-state sensors (piezoresistive, capacitive, resonant) |
| Moving Parts | Yes (levers, diaphragms) | No (all solid-state) |
| Accuracy | Low (±0.25% to ±0.5%) | High (±0.075% to ±0.02%) |
| Long-Term Stability | Good, but with mechanical drift | Excellent (minimal drift in solid-state devices) |
| Structure and Volume | Complex, large, and heavy | Simple, compact, and lightweight |
| Intelligent Functions | No (analog signal) | Abundant (HART/bus, self-diagnosis, multi-variable) |
| Range Adjustment | Mechanical adjustment (moving the fulcrum) | Digital setting (software setting) |
| Maintenance | Complex, requiring mechanical adjustment | Simple, can be completed remotely via software |
| Representative Technologies | Analog force balance | MEMS, silicon resonant, digital compensation |
- Maintenance and replacement of old plants: In a large number of still-operating old devices.
- Special occasions: In the nuclear industry, high-radiation, and strong electromagnetic interference environments, it has unique advantages because it does not rely on semiconductor devices.
- Teaching and principle understanding: Its principle is intuitive and is an excellent teaching aid for understanding the "input-feedback-output" closed-loop concept of transmitters.
The torque balance pressure transmitter is a great milestone in the history of industrial automation. It was the first to achieve on a large scale the reliable conversion of on-site physical quantities (pressure) into standard current signals, laying the foundation for centralized control (the predecessor of DCS).
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