Category Archives: Pressure Manometer

A brief review of the PS309 and PS409 Pressure Manometers offered by Validyne Engineering

Both the PS309 and PS409 pressure manometers offered by Validyne Engineering feature lightweight construction, absolute differential, and gauge ranges of 0.08 psi to 3200 psi FS. All surfaces that contact pressure media are 410 stainless steel in both units. There are, however, some differences. Let’s briefly review each manometer and cover some features and capabilities of each.

PS309 Pressure Manometer

pressure manometerAs a totally self-contained pressure manometer, the PS309 is a portable unit that comes in gauge, absolute, and differential ranges. It offers a front panel liquid crystal digital display, as well as a 2 VDC analog output designed for remote recording or control.

For portable operations, the PS309 features a 3.5 digit LCD and battery pack (6-1.5V penlight cells), a solid-state electronics module, and integrated VR transducer. All surfaces that contact the pressure media are made from all corrosion resistant materials. It has ultra-low volumetric displacement with full-scale pressure exertion as well as very low internal cavity volumes.

The unit includes the capacity for individual meter scaling adjustments and, through easy front panel adjustment, decimal point selection for the display is user-programmable.

An optional feature of the PS309 is switch-selected Pressure and Flow operating modes. Each mode offers separate 2 VDC analog outputs and individual scaling adjustments.

PS409 Pressure Manometer

pressure manometerDesigned for installation in rack-mount panels in laboratory and industrial applications, the PS409 pressure manometer we offer at Validyne Engineering is a self-contained digital indicator and sensor. It is ideal where accurate low-pressure readings are needed. The unit includes an integral VR transducer and easy-to-read 0.5 inch high x 4.5 digit LED display. It also offers a temperature range of 0ºF to 160ºF.

Digital Indicator of the PS409

The digital indicator offers read-outs in 3 different engineering units: PSI, In. H2O and In. Hg, which can be selected by the user from front panel buttons. Separate internal calibration adjustments for analog output and meter display are also featured.

Pressure Transducer for the PS409

Available in gauge, absolute, and differential versions, the PS409 is built of corrosion-resistant materials at points of contact with pressure media. The PS409 is available in 23 pressure ranges, from 0.08 to 3200 psi FS. The unit can also deliver 5 VDC analog output for remote display, control or recording purposes.

Applications of the PS409 include pneumatic systems, test cell and test panel applications, engine and vehicle test stands, pumps and hydraulic systems, process/product control testing, gas distribution, emission testing, and fuel pressure.

For Simplicity and Accuracy, Nothing Beats a Pressure Manometer

Industries have many requirements for measuring pressure. Applications include measuring fluid levels, tank pressures, flow rates or hydraulic system pressures. For the measurement of low pressures, one such device is called a pressure manometer.

Manometers were first used shaped as a U-tube – is simply a tube filled with liquid. The unit functions on the principles of gravity and the density of the liquid being measured. A ruler or scale is used to measure the height of the fluid in the U-tube and this directly reads the pressure present. Pressure ranges for manometers are as small as a few inches of water column to several feet.

Measuring Air Flow
A pressure manometer is often used to measure the air-flow speed. Moving air creates a force that is proportional to velocity. This force, typically just a few inches of water column, is applied to the manometer for measurement and then converted to flow by a simple calculation. The measurement of flow in air in ducts and ventilation systems is one such use of the manometer.

Medical Applications
Another use of manometers is the measurement blood pressure using an air cuff. Low pressure manometers may also be used to measure the flow and pressure in a patient’s airways. Manometers have also been used in industrial settings, wind tunnels, and the measurement of atmospheric pressure for weather forecasting.

Digital Manometers
There are many manometer designs to choose from. Most manometers available now are digital models. This is because fluid manometers using mercury are considered a toxic hazard. At Validyne, our manometers work by using a pressure transducer instead of a column of fluid to make the pressure measurement. Digital manometers can be utilized with any equipment that relies on gas or liquid to operate.

Manometers can also isolate system pressure problems from barbecue grills to propane and natural gas. The HVAC industry, on occasion, will use these units to troubleshoot air conditioning and heating systems. Manometers can also be used to troubleshoot a wide variety of pneumatic or low-pressure gas systems.

Advantages of a Pressure Manometer
There are several advantages of using electronic manometers. An electronic manometer is portable and more compact than the old fluid-filled types. The electronic manometer is more accurate and provides a greater resolution than older versions, and a digital display is easier to read.