How to adjust Pressure switch of RO plant

High/low pressure switch

The high/low pressure switch of RO plant is to prevent the high pressure pump from working under extreme high/low pressure.

With the increase of operation time, the membrane will be blocked so pressure will increase steadily. If the pressure increase without control may cause the damage of system or pipe, so at this time high pressure switch can protect system by forcing the system to stop until the pressure decrease to the normal range.

When the feed water pressure can not meet demand, the system can not operate manually so will keep discharging the waste water, so at this time low pressure switch can protect system by forcing the system to stop until the pressure increase to the normal range.

How to adjust the pressure switch

The low pressure switch has two adjustable screws, one is to adjust the reference pressure, generally 0-6bar, and the other is to adjust the differential pressure, generally 0-2bar, which can be adjusted with a screwdriver.

There are two possibilities that the common low pressure switch always jumps, one is that the raw water pressure fluctuates greatly, and the other is that the reference pressure is near the raw water pressure value and the return differential pressure is small.

How to solve small hysteresis pressure

1. First observe the pressure during normal operation of the equipment, and adjust the reference pressure to be slightly lower than it. For example, the pretreatment water pressure is 2.5bar, then the reference pressure can be adjusted to 2bar.

2. Set the pressure value of the low pressure jump. For example, when the raw water pressure is lower than 1.5bar, the pressure switch starts to jump, then adjust the return pressure to 0.5bar.

3. Although it has been adjusted, the accuracy of the adjustment is also different. Therefore, adjust according to the actual pressure condition until it meets your own requirements. For example, when the pressure is 2bar, it will be closed, and when the pressure is 1.5bar, it will be opened (this time you can The pressure is adjusted by adjusting the high pressure pump valve or the raw water pump outlet valve).

4. If you want the pressure hysteresis to be larger, you can also adjust the hysteresis pressure to 0.8-1.0bar, so that when the pressure reaches 2bar, it will close, and when the pressure is lower than 1bar, it will jump.

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