What is the difference between the second bus and the four bus of the residual pressure monitoring system

The birth of the residual pressure monitoring system is a sign of keeping pace with the times in fire protection work. In the event of a fire, the system can automatically adjust the air supply volume of the mechanical pressurized air supply system, and can also effectively solve the problem that the pressure difference on both sides of the evacuation door is too large and the door cannot be opened normally, so that the pressurized air supply system is in Reasonable and effective working conditions, thus providing a strong guarantee for the evacuation and rescue of personnel in the current fire situation.

Since the development of the residual pressure monitoring system , there are continuous product updates and iterations. However, the most common is still the two bus and four bus, so the question is what is the difference between these two products?

As the name implies, first of all, these two products have different wiring methods. The connection lines of the four bus products are mainly four wires, two power lines and two signal lines, and the wiring method is fixed; while the two bus products are two power supplies with no polarity. Signal cable connection.

Then the nature of the product is different.

1. Difference of residual pressure sensor :

The sensor of the second bus is more compact and delicate in appearance, and the installation is simpler and more beautiful. The digital display function, carrying address code, and analog control mode make the measured value more precise and the operation more accurate.

Speaking of which, it is estimated that someone will ask, what is analog operation, analog is a continuous physical quantity in time and quantity, and the signal it represents is an analog signal. Any value of the analog quantity in the continuous change process is a specific meaningful physical quantity, such as temperature, voltage, current, etc. The pressure relief valve actuator in the second bus is also based on this principle, and the pressure relief valve is controlled by analog quantity.

The four-bus sensor is controlled by a mechanical switch. Compared with the two-bus, the stability of the adjustment value is less effective, but the cost performance is relatively high. It is currently a product with more choices on the market.

The mechanical switching value generally refers to the "open" and "closed" state of the contacts. Generally, "0" or "1" is also used in computer equipment to indicate the state of the switching value.

2. The difference of residual pressure controller :

The controller of the second bus is a control module, which is installed in the distribution box of the pressurized fan using a guide rail. Its advantage is that it is easy to transport, more convenient to install, save space, more functional than the control box, compatible with 24V and 22V electric actuators.

The four-bus controller is also called a bypass controller, which can be equipped with 24V or 220V control power according to the type of electric actuator. Independent installation, according to indoor / outdoor environment, choose indoor / outdoor cabinet. Its advantages are flexible installation, no space restrictions, and easy maintenance; its disadvantages are also obvious, compared to heavy, bulky, and relatively complicated installation.

After comparing the two products of the residual pressure monitoring system , we can better choose the product suitable for our project.