First, let's understand the structure and function of conventional pressure transmitters. The pressure transmitter is mainly composed of a pressure sensor, a measuring conversion circuit, and process connection components. Its function is to convert the physical pressure parameters sensed by the pressure sensor into standard electrical signals, which are used for display, alarm, DCS system, recorder, PLC system, and other purposes.
During these operations, many different problems may occur. At this time, attention should be paid to the maintenance and protection of the pressure transmitter during operation. Below we analyze the specific precautions for using pressure transmitters. Let Lefoo pressure transmitter manufacturer list and summary for you.
First, check for signal interference around the pressure transmitter. If there is any, try to eliminate it, or connect the sensor shielding wire to the metal shell to enhance anti-interference capability.
The pressure transmitter should be regularly cleaned, and the installation holes should be kept clean to prevent the pressure transmitter from coming into contact with corrosive or overheated media.
When wiring the pressure transmitter, the cable should be threaded through the waterproof connector (accessory) or wound around a flexible tube and tightly sealed with a sealing nut to prevent rainwater and other liquids from leaking into the pressure transmitter housing through the cable.
When measuring gas pressure with a pressure transmitter, the pressure port should be opened at the top of the process pipeline. The pressure transmitter should also be installed at the upper part of the process pipeline so that the accumulated liquid can easily flow into the process pipeline.
When measuring liquid pressure with a pressure transmitter, the pressure port should be opened on the side of the process pipeline to avoid sedimentation.
Voltage higher than 36V should not be used on the pressure transmitter, as it may cause damage.
Pressure transmitters installed outdoors in winter must be protected against freezing to prevent the liquid in the pressure port from expanding due to freezing, which may cause sensor damage.
When measuring steam or other high-temperature media with a pressure transmitter, a condenser such as a buffer tube (coil) should be connected. The working temperature of the pressure transmitter should not exceed the limit. The buffer tube needs to be filled with a suitable amount of water to prevent overheated steam from contacting the pressure transmitter. The buffer radiator should not leak air.
The installation position of the pressure transmitter for measuring liquid pressure should avoid liquid impact (water hammer phenomenon) to prevent sensor overvoltage damage.
The pressure transmitter's impulse tube should be installed in a place with small temperature fluctuations.
Prevent sediment deposition in the impulse tube of the pressure transmitter.
The medium being measured by the pressure transmitter should not freeze. Once frozen, the diaphragm may be damaged as it is generally thin.
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