The Series S2000 is a versatile gauge when it comes to measuring low air pressure ranges.  From measuring positive static pressure of a duct, to negative pressure of a cleanroom, to differential pressure across an air filter, the S2000 is the ideal pressure measuring instrument when needing visual indications for low pressure applications.   Every S2000 gauge comes with four ports, two high ports and two low ports.  This allows the gauge to be mounted in different orientations based on where the gauge is being mounted.  The proper use of these ports is what allows the gauge to be used in the multiple ways listed above.  Based on your needs, the gauge will have to be set up according to the type of pressure you are trying to measure.  If you need more information on understanding positive, negative, and differential pressure, feel free to visit this page on the different types of pressure.   Measuring Positive Pressure To measure positive pressure, the air supply or pressure being measured, will have to be exposed to one of the high ports.  Determine which high port is most convenient for you to connect a hose to and block the other with one of the plugs that comes with every S2000 gauge.  Connect a hose to the open high port and place the other end of the hose in the area where the pressure is being measured.  It is not necessary in this situation to plug any of the low ports since the pressure you are measuring is being measured against atmospheric pressure.   Measuring Negative Pressure To measure negative pressure, you will simply do the opposite.  Determine which low port is most convenient for you to connect a hose to and plug up the other low port.  Connect a hose to the open low port and place the other end of the hose in the area where the pressure is being measured.  The high ports can be left open because in this instance the gauge will yet again be measuring against atmospheric pressure.   Measuring Differential Pressure Measuring differential pressure is a slightly different story when it comes to set up.  In this case you would have two pressure sources being measured and you are trying to determine the difference in the pressures.  In this situation, determine which high port and low port are most convenient for you to connected hoses to and plug up the other two ports.  With one high port and one low port plugged up, connect the open high port to a hose and place the other end in the environment that contains the higher of the two pressures being compared.  And likewise, connect the open low port to a second hose and put the other end in the environment that contains the lower of the two pressures being compared.   And that’s about it.  If you have followed the instructions mentioned, you should be able to measure the desired type of pressure.  There are typical issues that we at Sensocon have witnessed people coming across and I will address those in hopes of saving you some time should you come across them. COMMON PROBLEMS WHEN MEASURING PRESSURE -The pressure gauge isn’t measuring high pressure.  The most common causes of this pertain to the plugs and the connections.  Make sure that one high port is plugged and that at least one low port is unplugged.  Make sure the open high port is connected to the pressure source.  If those are properly set up, then the next most common issue is the hose it’s connected to or the pressure source itself.  Fully check the hose to make sure that the hose isn’t crimped or has a hole somewhere it shouldn’t. -The pressure gauge isn’t measuring negative pressure.  This case is very similar to the high port issue, just in reverse.  Be sure to check that one low port is plugged and at least one high port is open.  Check the hoses for crimping and holes as well. -The pressure gauge isn’t measuring differential pressure.  As you would expect, some of the information that applies to positive pressure and negative pressure apply to differential pressure as well.  But the most common issue of not being able to measure differential pressure is the connection of the ports to the correct pressures.  Make sure that the high port is connected to the highest pressure being measured and that the low port is measuring the lowest pressure.  If you are unsure, switch the port connections and see if the gauge starts measuring the differential pressure.  If you are sure that the connections are correct, then proceed to check that one high port and one port are plugged, followed by checking the hoses for crimping and holes.   I hope that this has been informative for you.  If you have any questions about our products, how they are used or set up, or just need general information about differential pressure, feel free to contact us at 863-248-2800 of reach us through email at info@sensocon.com.