{"id":4903,"date":"2015-08-03T14:13:00","date_gmt":"2015-08-03T14:13:00","guid":{"rendered":"http:\/\/www.equilibar.com\/?page_id=4903"},"modified":"2025-07-30T13:22:14","modified_gmt":"2025-07-30T17:22:14","slug":"low-pressure-electronic-regulator","status":"publish","type":"page","link":"https:\/\/www.equilibar.com\/pt-br\/low-pressure-control\/low-pressure-electronic-regulator\/","title":{"rendered":"Low Pressure Electronic Regulator"},"content":{"rendered":"

Controlling ultra low pressures in the inches of water, pascal, and millibar range can be quite difficult with traditional spring loaded regulators. The primary reason for this is due to how challenging it is to get valve parts to move with such low pressures. Using an electronic pressure regulator to control these pressures is a surprisingly accurate alternative. These electronic valves work by using a sensitive pressure transducer to sense minute changes in pressure and adjust the gas input and exhaust using solenoid valves. This method allows us to make much smaller adjustments in pressure than with a traditional regulator.<\/p> Request A Quote<\/a>

Method of Operation<\/h2>

The QPV electronic pressure regulator accepts an analog voltage (0 – 10V) or current (4 – 20 mA) signal. The unit will control proportional to the signal received. For example, with a 0 – 10 V = 0 – 1 psig \/ 68 millibar(g) unit, giving the unit a command of 5V tells the unit to go to 0.5 psig \/ 34 millibar(g) and giving the unit a command of 10V tells the unit to go to 1 psig \/ 68 millibar(g). Similarly, with a 4 – 20 mA = 0 – 1.0 psig \/ 68 millibar(g) unit, giving the unit a command of 12 mA tells the unit to go to 0.5 psig \/ 34 millibar(g) and giving the unit a command of 20 mA tells the unit to go to 1.0 psig \/ 68 millibar(g).<\/p>

You can control the unit using your own PLC (programmable logic controller), a data acquisition device such as a DAQ<\/a> with software such as LabVIEW<\/a> by National Instruments<\/a>, or even just a simple potentiometer (variable resistor).<\/p>

Accuracy & Repeatability<\/h2>

The QPV series electronic pressure regulator has calibration ranges as low as 0 – 2 in H2<\/sub>0 (0 – 500 Pa, 0 – 5 millibar(g)) with an accuracy of +\/-0.25% of full scale calibration for pressure ranges above 1 psig \/ 68 millibar(g) and an accuracy of 1% of full scale for pressures ranges 1 psig \/ 68 millibar(g) and below.<\/p>

The QPV1 will go to the desired pressure accurate to within \u00b11% of full scale calibrated range (for pressures below 1 psig \/ 68 millibar(g)). However, the repeatability spec of \u00b10.2% may be more applicable. This means that when given the same command, the unit\u00a0will always be within the \u00b11% range of pressure, but will also be within 0.2% (of full scale) of the same pressure.<\/p>

For Example: A 0 – 500 Pa calibrated unit.
Accuracy: Command of 5 VCD (or 12 mA) tells the unit to go to 250.0 Pa. It could land anywhere between 245 Pa and 255 Pa for an accuracy of +\/- 5 Pa.
Repeatability: Say the unit hits 250.625 Pa, it will always be within \u00b10.2% of that number or, \u00b11 Pa. Very repeatable.<\/p>

Below are some example calibration ranges and their associated accuracy and repeatability.

Calibration Range<\/th> Accuracy<\/th> Repeatability<\/th> <\/tr> <\/thead>
0 – 2 in H2<\/sub>0<\/td> \u00b10.02 in H2<\/sub>0<\/td> \u00b10.004 in H2<\/sub>0<\/td> <\/tr>
0 – 10 in H2<\/sub>0<\/td> \u00b10.10 in H2<\/sub>0<\/td> \u00b10.02 in H2<\/sub>0<\/td> <\/tr>
0 – 500 Pa<\/td> \u00b15 Pa<\/td> \u00b11 Pa<\/td> <\/tr>
0 – 5 millibar(g)<\/td> \u00b10.05 millibar(g)<\/td> \u00b10.01 millibar(g)<\/td> <\/tr>
0 – 1 psig<\/td> \u00b10.01 psig<\/td> \u00b10.002 psig<\/td> <\/tr> <\/tbody> <\/table><\/div> <\/p>

Note: These are just example calibration ranges. The QPV can be calibrated to any pressure range from as low as 0 – 2 in H2<\/sub>0 (0 – 500 Pa, 0 – 5 millibar(g)) to as high as 0 – 150 psig (0 – 1000 kPa, 0 – 10 bar(g)).<\/p> <\/div>

\"Photo

Equilibar QPV low pressure electronic pressure regulator<\/p><\/div> Download Brochure<\/a>

\"photo<\/a>

Equilibar QPV is used as an electronic pilot regulator for an Equilibar GS Series back pressure regulator<\/p><\/div> <\/div><\/div>

Price and Availability<\/h2>

The QPV is surprisingly affordable and Equilibar offers a few models off the shelf for quick delivery. Custom calibration ranges and digital displays are available at 6-8 weeks lead time. Below is a list of these readily available part numbers:

Pressure Range<\/th> Command Signal<\/th> Monitor Signal<\/th> Part Number<\/th> <\/th> <\/tr> <\/thead>
Low Pressure Options<\/td> <\/tr>
0 \u2013 10 in H2<\/sub>0 \/ 254 mm H2<\/sub>0<\/td> 0 \u2013 10 VDC<\/td> 0 \u2013 10 VDC<\/td> QPV1MANEEZP10IWGAXL<\/td> <\/td> <\/tr>
0 \u2013 1 psig \/ 68 millibar(g)<\/td> QPV1MANEEZP1PSGAXL<\/td> <\/tr>
0 \u2013 10 psig \/ 689 millibar(g)<\/td> QPV1MANEEZP10PSGAXL<\/td> <\/tr>
Medium Pressure Options<\/td> <\/tr>
0 \u2013 50 psig \/ 3.4 bar(g)<\/td> 0 \u2013 10 VDC<\/td> 0 \u2013 10 VDC<\/td> QPV1MANEEZP50PSGAXL<\/td> <\/td> <\/tr>
0 \u2013 100 psig \/ 6.8 bar(g)<\/td> QPV1MANEEZP100PSGAXL<\/td> <\/tr>
0 \u2013 150 psig \/ 10 bar(g)<\/td> QPV1MANEEZP150PSGAXL<\/td> <\/tr>
Vacuum Options<\/td> <\/tr>
0 \u2013 30 in Hg (vacuum)<\/td> 0 – 10 VDC<\/td> 0 – 10 VDC<\/td> QPV1MANEEZN30IHGXAL<\/td> <\/td> <\/tr>
0 \u2013 30 in Hg (vacuum)<\/td> 4 \u2013 20 mA DC<\/td> 4 \u2013 20 mA DC (Sourcing)<\/td> QPV1MANISZN30IHGXAL<\/td> <\/tr> <\/tbody> <\/table><\/div>
<\/div><\/p>

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