Question 1

1. To be resistant to high temperatures

Accepted Answer

When measuring the pressure of the steam pipeline, a high-temperature pressure transmitter should be selected due to the high-temperature environment.

In fact, in steam conditions, it only needs to pass through the surface bend (condensation tube). After passing through the elbow, the steam will condense into water at the elbow. Insulate the temperature, so as to achieve a good cooling effect.

The pressure transmitter after passing through the elbow on the pipeline with insulation layer is basically at room temperature. If it is not insulated, the high temperature will rise, causing the temperature of all objects above the pipeline to rise.

Advantages: The use of bends can optimize the cost, and is compatible with the product.

The material selection of a good bend is high. It is thicker and more durable than the general watch bend on the market. Good pressure resistance. The price will be slightly more expensive.

Extended Reading: FMCW Radar for High Temperature Level Sensor

Question 2

2. Water hammer phenomenon

Accepted Answer

The above-mentioned pressure transmitter diaphragm damage is due to the phenomenon of water hammer.

The valve suddenly opens or closes, causing the pressure in the steam pipe to fluctuate suddenly.

Especially when the valve is opened, huge pressure fluctuations will cause the pipeline to vibrate violently. Even shocking.

The pressure transmitter will also withstand huge pressure in the pipeline. In severe cases, the core may be dented or even burst.

The prevention method is to install safety valves and accumulators, and open and close the valves slowly. Install a trap at the high point of the air discharge valve at the low point.

Some pressure transmitters will be protected by dampers and baffles.

The damper is a copper piece with a 4mm outer wire and a T-shaped thin through-tube structure inside. It can prevent the medium from directly impacting the diaphragm.

The baffle is placed on the front end of the core before assembling the core. Metal plate with holes. It also prevents the medium from directly impacting the diaphragm.

In the hydraulic machinery industry, there are a lot of equipment for pressure transmitters, which are often used for pressure control.

But hydraulic machinery is very prone to pressure shock when it is working. The shock pressure will far exceed the normal pressure, causing damage to the pressure transmitter.

In this case, some pressure transmitters have internal wires and dampers in the standard pressure port. Can effectively alleviate the impact.

The hydraulic and mechanical pressures are all above 10MPa. Generally, the transmitter above 10MPa should be equipped with a damper as standard. If the pressure shock is severe, a baffle can be added to alleviate the shock.

Extended Reading: Electronic Pressure Switch for Air Compressor

Question 3

What is a high pressure sensor?

Accepted Answer

A high pressure sensor is a device that converts the measured electrical parameters into DC current, DC voltage and isolates and outputs analog or digital signals.

The high pressure sensor usually adopts the selected foreign patch technology. The working principle is that the pressure of the measured pressure acts directly on the sensing piece of the sensor. The sensing piece produces a micro-displacement proportional to the pressure, and the resistance value of the sensor changes. And use the electronic circuit to detect this change. And convert and output a standard measurement signal corresponding to the pressure.

Question 4

What is a high temperature sensor?

Accepted Answer

High temperature sensor is a kind of pressure sensor commonly used in industrial practice. It is widely used in various industrial automatic control environments.

The working principle of the high temperature sensor: the pressure of the wind pressure sensor acts directly on the diaphragm of the sensor. The diaphragm produces a micro-displacement proportional to the pressure of the medium. The resistance of the sensor changes. And the electronic circuit is used to detect this change. And The conversion outputs a standard signal corresponding to this pressure.

Extended reading: High Temperature Flow Meter

Question 5

What is a HVAC pressure transducer?

Accepted Answer

In HVAC systems, end sensors and controllers are the key components to ensure the smooth operation of the entire system and achieve energy-saving effects.

In the central air conditioner, the filter is used to filter the dust and impurities in the ventilation duct. The pressure sensor at the indoor vent is used to monitor the air pressure difference between the two ends of the filter at the air outlet. With the accumulation of time, the dust on the filter will accumulate more and more. It will gradually affect the air circulation of the filter. When the air circulation is not smooth, the air pressure difference between the two ends of the filter will continue to increase.

When the pressure sensor senses the pressure change, the upper computer receives the signal from the pressure sensor. When the signal value reaches the alarm point, it will start to alarm. It reminds the cleaning staff to replace or clean the filter. In addition to this role, the pressure sensor is also used to participate in the control of the air supply volume of the air outlet.

Extended reading: Miniature Pressure Switch

Month: March 2020

SI-512H High Temperature Pressure Sensor

SI-PT series Melt Pressure Sensors/Transducers – High Temperature

SI-702S Ultra High pressure transducer

SI-702 High Pressure Sensor

SI-503K Gas Pressure Transducer

SI-703 Flush Diaphragm Pressure Sensor

Application Analysis of Intelligent Pressure Transmitter

Industrial Pressure Transmitters

Industrial Pressure Sensors

SI-ML Portable Ultrasonic Liquid Level Indicator