Compressor pressure switch: overview, models, manual, adjustment and feedback

Compressor stations provide the compressed air with tools and equipment, working under high pressure. Accordingly, without proper control, engine overloads and, as a consequence, breakages in the element base are not excluded. Therefore, modern models are equipped with a measuring component, which allows to keep the pressure values in the norm. For this, a pressure switch for the compressor is used in the form of a relay unit. But it is important to take into account that this device does not regulate the pressure by itself, but only informs the user about its values and in some cases can give a signal to stop the air supply.

Principle of operation and device

The design of the pressure switch is a small unit, provided with inlet pipes, a membrane and a sensitive element - a spring. During operation of the compressor, the pressure corresponding to the working level at the current moment is on the membrane. The membrane mechanically acts on the spring, which, in turn, transfers the load to the pressure switch. Pressostats for compressors, as already noted, do not exert a regulatory influence, but the excessive force of pressure on the spring automatically opens the circuit and the equipment switches off. Initially, the user can set the threshold, reaching which the spring produces an opening.

There are single- and three-phase models of pressure switches. The first operate in a 220 V network, are equipped with on / off buttons, as well as a discharge valve. The three-phase pressure switch for the 380 V compressor can additionally provide for the thermal protection of the motor in the design, since loads during the operation of high-power models of this type are also caused by high temperatures. These two types of pressostats differ in size, which is important to keep in mind with the construction add-on.

User's manual

Universal connection flanges are used to connect the device. Depending on the model, their number can vary from 1 to 3. The standard size of the hole is 1/4 inch. In the expanded configuration, the flanges allow the addition of manometers, valves and fuses. Regarding the adjusting process, in the simplest models it is supposed to use one regulator, with which the peak value is set, after which the unit stops working. The multifunctional air compressor pressostat contains two regulators and a pressure gauge for presenting current pressures. The first regulator fixes the threshold value at overloads, and the second one allows to set the startup level of the unit after restoring the optimal state of the operating parameters.

Comments about the model 210001 from Fubag

A standard solution for most compressors that are used in domestic tasks. As the owners of this relay note, it stably provides the function of stabilizing the equipment state, clearly giving commands for switching on and off. Experts point out that in terms of reliability, this compressor pressure switch is one of the best in its class. Again, the model is budgetary, so it is not worth waiting for the broad control possibilities from it initially. The device is recommended for operation in combination with a pneumatic tool, the operation of which does not differ with large volumes of compressed air consumption.

Comments on the MDR from Condor

Manufacturer Condor produces a pressure fitting for a wide range of products, offering not only options for compressors, but also for pumping equipment. In this case, we consider a series of models MDR, which are designed for compressors of different capacities. The users of such devices indicate the possibility of fine tuning the intervals between the cut-off and on-off limits, the support of a maximum value of up to 11 Bar and, in general, modern ergonomics. True, there is a shortage of such devices - this is a cost that is 3-4 thousand rubles. Therefore, it is recommended to purchase pressure switches for compressors in assembly, which will be cheaper by 10-20%. Condor specifically calculates its products for equipment from large compressor manufacturers, so we can talk about the compliance of these relays with a high class of target units. This is confirmed by ordinary private users, and employees of manufacturing enterprises.

Comments on LP models by Honeywell

Honeywell is known for quality measuring instruments and equipment, including those intended for compressors. LP series is oriented to low-pressure units, which is suitable for compressor equipment. Among users, this line is valued for the ability to operate the equipment at low levels - up to 0.5 Bar. In addition, operators of compressed air injection stations note the reliability of the elemental composition and optimized implementation of electromechanics. That is, the sensitive components that the pressostat for the LP compressor is supplied with completely work out their life without the need for premature repair.

Conclusion

Only in rare cases, compressors are used without pressure gauges and pressure switches. These are mandatory components for this type of equipment, which are most often included in the basic delivery set. If, for some reason or another, only the compressor is on hand, then you should carefully approach the choice of the pressure switch. For this it is recommended to take into account two parameters - voltage (one- or three-phase) and operating pressure levels. It is desirable that the pressure switch for the compressor has a wider range of extreme pressure points, otherwise failures may appear in its operation. More importantly, the operation of powerful compressor stations is organized with additional servicing components. Suffice it to call receivers, heads and adapters. Some of these accessories may be part of the monitoring relay. To realize this possibility, it is necessary to select a pressure switch, provided with three outlet nozzles.