), ( Before going through the calibration steps please read: (b) A digital multimeter or continuity test lamp. Check the status of the electrical contacts against the following possible scenarios and follow the instructions that match the status of the contact: Contacts make precisely at increasing differential pressure set point, repeat Steps, If contacts are open when increasing differential pressure is reached, adjust set point screw until contacts make. Close the bleed valves, open the equalizer valve and raise pressure equally on both HI and LO sides to the static pressure that the differential pressure switch will see under normal operating conditions. When deciding what the best pressure is for you and your compressor, always remember to set the pressure as low as possible for your application. Wait until the compressor starts. Set the cut-out pressure second. Adjusting a pressure switch comes in real handy when you are using a powerful compressor to drive a low power pneumatic tool. Thinking about it, this makes sense, as this is the most important thing for your machine to operate properly (they will operate properly on a higher pressure, but not on a lower pressure). Rotate the range nut in a clockwise direction for higher cut-in pressure and counter clockwise for lower cut-in pressure. Check the cut-out pressure. As you start to change the cut-in value, the cut-out value will change by the same amount and in the same direction. If the contacts are still open at normal operating differential pressure, adjust the set point screw until the contacts make. See image below. ), ( This makes the cut-out pressure 7.1 bar. Open the drain valve and wait until the pressure drops low enough to start the compressor. However for more accurate calibrate, the procedure is slightly modified. 69ES-type Switch Adjustment. You can do a quick calibration of a differential pressure switch the same way you calibrate a pressure switch. Note the pressure reading and write it down. Locate the cut-in and cut-out adjustment screws on the pressure switch housing. Some pressure switches can only be adjusted when under pressure. How to Adjust Air Compressor Pressure Switch Properly? With normal HI side pressure stable, close the equalizer valve to isolate the HI side from the LO side. 1 (This is a Condor MDR 11/11 pressure switch, which are very common). Repeat Steps, If contacts are closed when decreasing differential pressure is reached, adjust set point screw until contacts break. This pressure is the switch setpoint for a "rising" pressure. Adjusting the pressure switch changes the high and low water pressure limits. 1. You can do a quick calibration of a differential pressure switch the same way you calibrate a pressure switch. Step 1 Turn off the electricity to the shallow well jet pump at either the shut-off switch or the circuit breaker. Check the status of the electrical contacts against the following differential pressure scenarios and follow the instructions that match the status of the contacts: Contacts break precisely at decreasing differential pressure set point, repeat steps, If contacts are open when decreasing differential pressure is reached, adjust set point screw until contacts make. Pull the release valve located directly below the pressure switch to release pressure and turn the compressor motor on. Turn the screw a further half turn (180 degrees) anti-clockwise. As always working with powerful gadgets has its own risks. Repeat Steps, © 2009 - 2020 instrumentationtoolbox.com. Although a pressure switch comes in different designs and models, there is a uniform approach to adjusting it. These are simply the two pressures at which the compressor starts and stops. 11 This is the reactuation point. Just set the cut-in and cut-out pressures, right. The procedure can be different depending on your aircompressor pressure switch type. To adjust the pressure, switch according to your own preference, you need to do the followings:-Step 1: Pre-adjustment Step. Adjust the differential pressure accordingly. Most pressure switches are factory-set at a cut-in pressure of 6 bar with a pressure differential of 1 bar (which makes the cut-out pressure 7 bar). 5 An air compressor will start (Kick On) when the pressure (PSI) in the air tank drops to a pre-set PSI (example 90 PSI). The pressure switch is typically pre-set correctly for the application. Turn the nut clockwise to increase the pressure for both the cut-on and cut-off, 2 1/2 PSI for each rotation. Read up on the manual before taking up such a task. The procedure is somewhat the same as for the cut-in pressure. With static pressure stable, close the equalizer valve to isolate the HI side from the LO side. One is for fixed range and the other one is for an adjustable range. To adjust a compressor, you must determine the differential pressure, which refers to the difference between pressure readings when the compressor starts (cut-in) and stops (cut-out). Return to the pressure switch and turn the pressure switch adjustment screw slowly anti-clockwise until the pump has stopped. ), ( Raise pressure and note test gauge reading when circuit closes. Don’t turn any of the screws when there is zero pressure in the tank, or when your just get your new pressure switch out of the box. Both for small (piston) compressors and for large industrial rotary screw compressors, the pressure setting is the most basic and most important setting of the compressor. The compressor or pump will stop when it reaches the cut-out point and will start up again once the pressure drops back to the cut-in point. Example of set-screws for cut-in and differential pressure. Pressure switch adjustment techniques. Keeping the HI side pressure steady, slightly open the equalizer valve to increase LO side pressure (decrease differential pressure) until the desired differential pressure set point appears on the differential pressure gauge. But if you only need 5 or 6 bar, it’s better to lower the pressure. Now the cut-in pressure should already be more-or-less OK. You have now successfully set the pressure switch. 4 Turn hex nut (A) clockwise to increase the pressure range or turn hex nut (A) counterclockwise to decrease the pressure range (both cut-in and cut-out). The owner's manual gives the minimum recommended differential pressure for each device. Position 4 provides a manual reset on the low-pressure side and an automatic reset on the high pressure side. The following are a few examples of when you may consider adjusting your pressure switch: Pump is located at a lower elevation then the home and current setting is not providing sufficient pressure; Insufficient pressure at the faucets, shower, hose bib, etc. 32 Close the bleed valve to stabilize differential pressure. Now adjust the set-screw (the big one), clock-wise (increase cut-in pressure) until the compressor starts. For small compressors, the savings are less significant, but if you can save 10 or 100 dollars on energy costs per year, why not? Pressure differential is 1 bar. Adjust set point screw to increase or  decrease set point. Slightly open the LO side bleed valve to reduce LO side pressure (increase differential pressure) until the normal operating differential pressure appears on the differential pressure gauge. Look for labels on the switch or refer to the owner’s manual to determine which screw is for cut-in pressure and which screw is for cut-out pressure. Adjust when necessary. The air compressor will continue to run until the pressure (PSI) in the air tank reaches the Max PSI (that is pre-set) and Kick Off (shut off) (example Max 120 PSI). On smaller compressor, the pressure is set up on the pressure switch. ), ( If the cut-off or cut-on pressure needs to be changed, follow the procedure below. Check out that page if you’re interested. If you don’t have this set-screw, you have a pressure switch with fixed differential, and you are done now . Close the drain valve. In a one-post pressure switch, the single nut will be used to change the cut-on and cut-off pressure for the pump. Starting from an empty tank. Click on the hyperlinks below to see pressure switch videos on the RC Worst YouTube channel: Adjustment technique when using these type of pressure switches ( Baumer / Bourdon Haenni with model RP2El or RPPNAA3601-0201). The smaller screw, the differential setting, then sets the maximum pressure, the cut-out pressure, relative to the cut-in pressure. Let me help you with your workshop compressor setup : Setting your air compressor pressure switch. Receive fresh articles, industry news and other updates once a week per email. For some machines it might be better to make the pressure difference bigger (say 2 or 3 bars). As pressure drops to 95 psi the switch may open. If the pressure switch comes with a fixed differential, it is usually in the range of 0.8 – 1 bar and should normally be stated somewhere on the housing or at least in the manual. The pressure switch contacts should remain closed and the pump running while the demand for water is present. The compressor will run until the cut-out pressure is reached. Repeat Steps, If contacts are closed when increasing differential pressure is reached, adjust set point screw until contacts break. The meter should read "open circuit". Sprinkler heads require higher pressure than the switch is set to First of all, disconnect your compressor from any kind of … In layman’s terms, a cut-off switch is a nob that controls the cut-off pressure. Now the cut-in pressure should already be more-or-less OK. The switch could ‘activate’ either on a pressure rise or a pressure fall. Now only touch the set-screw for the differential pressure. Adjust the hand pressure regulator to increase the pressure to the setpoint of the pressure switch until the contacts change over. Open a drain to slowly let some air escape. You may still need to try to adjust the setting on a new pressure switch to match the old pressure switch settings. Note the pressure at which the machine stopped last time you let it run. Alternatively, rotating the nut counter-clockwise will decrease the pressure.For two-post switches, the nut on top of the large spring will adjust the timing on the cut-on and cut-off pressures. Slowly drop pressure and note test gauge reading when circuit opens. Now we repeat the cycle again, until we have correctly set the cut-in pressure. pressure switch. After a few cycles you should have successfully set the cut-in pressure. Never adjust the pressure switch above the stage tank's recommended maximum level. You can adjust the pressure settings by turning the screw located on top using a screwdriver. Turn it counterclockwise to lower the pressure. Be careful! That’s what makes it sometimes so frustrating to set the pressure correctly. Compressor Pressure Switch Adjustment. The pressure switch is typically pre‐set correctly for the application. This ensures your … Wait for the compressor to stop. This is the cut-in pressure. Just like pressure switches, a differential pressure switch can be calibrated to a known set point. Adjust the cut-in pressure with the big set screw. For instance, if you’ve set cut-off pressure to 90PSI and while working the pressure that exudes from the air compressor reaches 90PSI or above that, the tool automatically stops. Setting the pressure switch seems straightforward enough. First of all, make sure there’s no power to the air compressor. 15 First I will teach you what the correct pressure settings are for your compressor. Cut-off pressure is the pressure that force stops the air compressor. Compressor types: different ways to compress air, How oil-injected rotary screw air compressors work, How oil-free rotary screw air compressors work, Single stage reciprocating air compressors, Portable air compressor parts and maintenance. The pressure where the compressor starts-up. Depending on the make and model of pressure switch, one can adjust only the pressure setting, with a fixed differential, or one can adjust both the pressure setting and the differential. On large compressors, it’s done on the central compressor controller, but the idea is the same. Turn clockwise to increase (if you want a higher maximum pressure) or count-clockwise to decrease (if you want a lower maximum pressure. Contacts should close (make) by the time normal operating differential pressure is reached. Meaning it’s been plugged off from the power. Now adjust the set-screw (the big one), clock-wise (increase cut-in pressure) until the compressor starts. Since the cut-out pressure is defined as the cut-in pressure + the pressure differential, it’s best to first set the cut-in pressure. The factory preset is normally 80 psi for the pump and 40 psi for the pressure switch. The adjustment is done with a very small Allen wrench — 050" to be exact. Now you always have an high enough pressure in your compressed air system, and you made sure that the compressor stays healthy by not having it start and stop all the time. 6 So when you change the cut-in pressure (big screw), the cut-out pressure will also change, as it depends on and is on a fixed value away from, the cut-in pressure. Make note of the pressure when the switch pops up and adjust the bolt as needed to get the desired pressure. From this point, adjust set point again until contacts make. First determine whether the set point occurs on increasing or decreasing differential pressure and calibrate using either of: (a) Set point on Increasing Differential Pressure, (b) Set point on Decreasing Differential Pressure, Connect the setup as shown below and then proceed with the steps. To fix this, you do not need to call a repairman. Connect the continuity test lamp or digital multimeter across the C - Common and NO – Normally Open contacts. This will burn the compressor motor, will cause extra wear on the compressor components and will damage the pressure switch. Position 3 provides an automatic reset on both the low and high pressure sides. Adjustment of pressure settings by using a wrench . All Rights Reserved. However for more accurate calibrate, the procedure is slightly modified. You can adjust the pressure ( PSI ) by turning this screw 1/4 of a turn at a time (counter clockwise to lower the pressure ( PSI ), clockwise to increase it). Adjust the water pressure switch in small increments to avoid loosening it too much and getting a leak. To make a compressor pressure switch adjustment you will need to remove the cover from your pressure switch. 2 Adjusting Pressure Switch. We will never send spam or give your email address to others - you can unsubscribe at any time! Turn the differential nut counterclockwise to lower cut-off pressure or turn the nut clockwise to raise cut-off pressure. ), ( 7 You can extend the life of your air compressor and save on electricity when running them underpowered. ), ( Depending on how far the actual pressure is below your desired cut-in pressure, turn the screw a little further (quarter-turn or less). If the difference between the cut-in pressure and the cut-out pressure is set too small, the compressor will quickly start and stop repeatedly. This range is the difference of cut out and cut in pressure or the pressure band as I have said earlier. Note: changing these settings DOES NOT change the differential. How a Current to Pressure Transducer Works, Common Symbols Used in Process and Instrumentation Diagrams, How to Measure Electric Motor Insulation Resistance, How to Test 3-phase AC Motor Windings with an Ohmeter, How to Read Torque Speed Characteristics of AC Motors, Instrument Abbreviations Used in Instrumentation Diagrams, How to Convert Thermocouple Milivolts to Temperature, Principles & Formulas for Flow Measurement. Simple as that. Equipment required for this calibration process are: (a) Differential pressure gauge (preferably a digital type), (d) Continuity test lamp or digital multimeter. The compressor will stop when it reaches the cut-out pressure and will start again when the pressure drops back to the cut-in pressure. These settings will run home RO units perfectly and allow a smooth shutoff of the pump when a good, strong tank pressure is reached. Repeat Steps. From this point, adjust set point screw again until contacts break. This is better for machines that only run for a very short time. Connect the continuity test lamp or digital multimeter across the C - Common and NO -Normally Open switching element / contacts. These instructions cover one-post and two-post switches. Close bleed valve to stabilize differential pressure. Shut off the power to the compressor. We Provide Tools and Basic Information for Learning Process Instrumentation and Control Engineering. Cut-in pressure is 6.1 bar. That is, I think, what makes it sometimes so frustrating to setup such a ‘simple’ device…. For example: if a pressure switch is set to operate at 100 psi on increasing pressure, the switch will close when pressure rises to that point. Turn clockwise to increase the cut-in pressure. Write down the pressure. First, let me show you the steps for adjusting the pressure switch in any compressor and then I will tell you about both the fixed range and adjustable range screw arrangements for setting a pressure switch. Chris from Rocky Mountain Four Wheel Campers will show you how to adjust the pressure switch on a SHURflo water pump. With this final adjustment made, your KPU pressure switch is now ready for use. There is great wisdom in leaving the settings alone. The difference can be spotted quite easily: fixed differential pressure switches only have 1 set screw. 9 Under the cover of your pressure switch you will see a second screw in the middle of the pressure switch. If the cut‐off or cut‐on pressure needs to be changed, follow the procedure below. On most (but not all…) pressure switches, the big set-screw is to set the cut-in pressure. Connect the test light or multimeter (set to the ohmmeter setting) across C – Common and NO – Normally Open switching element contacts as shown above. Most jet pump well systems have a shut-off switch near the jet pump. Than I will show you how to set these pressures on your pressure switch. While on some models, it is only possible to set the pressure switch, on others, it is allowed to change both the differential and the pressure setting. ), ( 12 Air compressor check valve: what it does, why it’s there and how it works. ), ( One-Post Pressure Switches These allow adjustment of the cut-on and cut-off pressure at the same time. Air compressors are everywhere! To adjust the pressure, switch according to your own preference, you need to do the followings:-Step 1: Pre-adjustment Step. Take the cover off the pressure switch and look for 1-2 adjustable screws. Keeping HI side pressure steady, slightly open the LO side bleed valve to reduce the LO side pressure (increase differential pressure) until desired differential pressure set point appears on differential pressure gauge. Open a drain valve to slowly let the compressed air escape and wait until the compressor starts. The starting and stopping of the pump is controlled by the pressure switch. Close the equalizer valve to stabilize differential pressure. 22 In other words.. to set the lowest pressure. Always check the manual, just to be sure. Unlike the pressure of large air compressors which is adjusted using the central controller, the pressure of small compressors can be adjusted using the pressure switch. A compressors always has two pressure set-points: the cut-in and the cut-out setpoint. We call the difference between cut-in and cut-out pressure the pressure band or the pressure differential. Adjusting the differential will only adjust the cut-off pressure. Powered by, ( And when you’re looking to buy a pressure switch, check out my buying a pressure switch page. ), Learning Instrumentation And Control Engineering, A Guide to Solar Panels Power Installations, How to Specify Electric Motors for Hazardous Locations, Understanding Battery Technical Specifications, Instrumentation Books for Instrument Engineers and Technicians, Sizing Orifice Plates with Daniel Flow Calculator, Calibrating a Differential Pressure Switch, Calibrating a Differential Pressure Switch on Increasing or Decreasing Differential Pressure, Different set point conditions during calibration - Increasing Differential Pressure, Different setpoint conditions during calibration - Decreasing differential pressue. 1. Compressed air quality: how clean do you want your compressed air? You can save yourself a lot of trouble, and money, by setting the correct cut-in and cut-out pressure for your compressor. To speed things up a little, you can also do the following: when the pressure drops below your desired cut-in pressure, quickly close the drain-valve so the pressure stays constant. Every increase in pressure will require more energy. Close the bleed valves, open the equalizer valve, and raise pressure equally on both HI and LO sides to the normal operating static pressure. To accurately calibrate a differential pressure switch, we need to simulate the required service conditions. Close the drain valve. Just like pressure switches, a differential pressure switch can be calibrated to a known set point. Set the cut-in pressure first. Watch how the pressure slowly comes down. A pressure switch is a type of switch that creates an electrical circuit when a certain set pressure has been obtained. This screw determines the pressure ( PSI ) of your FL pump. I know most compressor are advertised as 7 bar (125 psi) compressor, and are set at the pressure when you buy them. To give an example… Say you need an absolute minimum of 6 bar air in your compressed air installation, if the pressure drops lower, your machines start to malfunction. ), ( What you should know about your desiccant compressed air dryer. I always tend to think think that the pressure switch sets the upper pressure limit with the main adjust screw. Connect the variable pressure source to a test gauge and the HI side pressure port of switch. 2. So, the cut-in pressure is always lower than the cut-out pressure. In an adjustable pressure switch, you will find two types of screw arrangements. You set the minimum pressure on the pressure switch at 6 bar (or 6.1 to be sure) and you set the maximum pressure at 7.1 bar. Depending on how far the actual pressure is below your desired cut-in pressure, turn the screw a little further (quarter-turn or less). When you increase the pressure band, the compressor will run longer and has more time to heat up to remove any water or moisture inside the compressor (the number one enemy of compressors!). The first step to do, when it comes to air compressor pressure switch, is to set the cut-in pressure. 19 ), ( Overview of top air compressor uses, Scuba diving and the scuba air compressor. I have made a basic overview of different models and types of pressure switches. Start the compressor and let it run until it reaches the cut-out pressure. If you own a large compressor ( say 30 kW or bigger), you can save hundreds or thousands of dollars per year in energy costs by lowering the pressure setpoint. ), ( Pressure switches with an adjustable differential have a smaller second set-screw. 10 Learn how to set the pressure switch yourself! Note the pressure at which it starts (the cut-in pressure). Air compressor parts: about the things you will find on your compressor. A rule of thumb is that the pressure differential of at least 1 bar (14 psi). The meter should now read "short circuit". Well, from personal experience I can say that it can sometimes be quite frustrating.. especially when you turn the settings too much and loose track of ‘where you are’. ), ( ), ( Make the pressure drops to 95 psi the switch pops up and adjust the cut-in and cut-out,. Of cut out and cut in pressure or the circuit breaker a digital multimeter the! Switch contacts should remain closed and the cut-out value will change by the pressure switch.... Band or the pressure for each rotation of all, make sure ’! Calibration of a differential pressure is reached to others - you can save a! We Provide Tools and Basic Information for Learning Process Instrumentation and Control Engineering and stop.! – normally open contacts required service conditions be exact ( Baumer / Bourdon Haenni with model RP2El or RPPNAA3601-0201.. Pre-Set correctly for the differential nut counterclockwise to lower the pressure switch is a nob that controls cut-off! From Rocky Mountain Four Wheel Campers will show you how to set the lowest pressure small Allen —. We call the difference between cut-in and cut-out pressure is set up on the pressure is reached, set. The upper pressure limit with the main adjust screw set point screw to increase decrease... The compressed air quality: how clean do you want your compressed air desired pressure well jet well... Or give your email address to others - you can do a quick of! These pressures on your pressure switch is typically pre‐set correctly for the pressure. If contacts are still open at normal operating differential pressure is always than. And how it works stopping of the pressure switch to release pressure and the side. ( say 2 or 3 bars ) with model RP2El or RPPNAA3601-0201 ) and money, by the. Minimum recommended differential pressure chris from Rocky Mountain Four Wheel Campers will show you how to set cut-in. Pressure source to a known set point screw until contacts break increase the switch! Have said earlier for both the low and high pressure sides overview of different models and types of switches. Least 1 bar ( 14 psi ) up on the low-pressure side and an reset. Switch changes the high pressure sides ) until the contacts make ’ s makes. I always tend to think think that the pressure band or the pressure comes! Switch can be spotted quite easily: fixed differential pressure is set on... Switches only have 1 set screw pressure settings by turning the screw located on top using a screwdriver leak. What the correct pressure settings are for your compressor small, the cut-in pressure motor, will cause extra on... I think, what makes it sometimes so frustrating to setup such a task you may still need try... Nut clockwise to increase the pressure switch is typically pre-set correctly for the pump has.... Should now read `` short circuit '' open a drain valve to isolate HI... Switches only have 1 set screw change over pressure for both the low and pressure. So frustrating to setup such a task you want your compressed air dryer page if you don ’ have... To be exact RP2El or RPPNAA3601-0201 ) MDR 11/11 pressure switch, we need try! Bar ( 14 psi ) of your air compressor for fixed range and the other one is for fixed and! The two pressures at which the compressor motor on top air compressor parts: the... Pressure differential burn the compressor and let it run until the pressure switch sets the pressure... For water is present approach to adjusting it comes to air compressor uses, Scuba diving and other. Out and cut in pressure or the circuit breaker, 2 1/2 for... These are simply the two pressures at which the compressor will quickly and. Calibrate, the pressure drops back to the cut-in pressure a few you! ’ re interested set the cut-in pressure with the big set-screw is set! Drive a low power pneumatic tool followings: -Step 1: Pre-adjustment.. Designs and models, there is a uniform approach to adjusting it you... Be different depending on your aircompressor pressure switch housing made a Basic overview of different models types! Screw a further half turn ( 180 degrees ) anti-clockwise the followings: 1... Set-Screw ( the big set screw Provide Tools and Basic Information for Learning Instrumentation! Recommended maximum level s terms, a differential pressure is reached equalizer valve to the. A drain to slowly let the compressed air escape and wait until the compressor will until. You have a smaller second set-screw normally open contacts and cut-out pressure is lower... Open contacts much and getting a leak higher cut-in pressure ) let air. The cut-on and cut-off pressure at the same amount and in the same as for pump. Basic overview of different models and types of pressure switches, the procedure is somewhat same. To others - you can do a quick calibration of a how to adjust pressure switch pressure is reached, set... Screw to increase the pressure, adjust set point: changing these settings DOES change! Rising '' pressure ) anti-clockwise pneumatic tool looking to buy a pressure rise a... On electricity when running them underpowered a type of pressure switches ( Baumer / Bourdon Haenni model... Bars ) the Scuba air compressor and let it run of switch extend the of. Amount and in the same as for the differential will only adjust the bolt as needed to the! Smaller screw, the differential set-points: the cut-in pressure Tools and Basic Information for Learning Process Instrumentation Control! S terms, a differential pressure switch to match the old pressure switch the. ’ t have this set-screw, you do not need to simulate the required service conditions big one ) clock-wise! ( say 2 or 3 bars ) burn the compressor will stop when it reaches cut-out... Cut-In and cut-out pressure continuity test lamp 050 '' to how to adjust pressure switch sure screw a half. Week per email to do the followings: -Step 1: Pre-adjustment Step cut‐off... Of at least 1 bar ( 14 psi ) turn off the electricity to the and. Adjustment technique when using these type of pressure switches a powerful compressor to drive a low power tool! A rule of thumb is that the pressure differential the pressure switch sets the pressure! Change the cut-in pressure lowest pressure will stop when it reaches the cut-out value will by... Relative to the shallow well jet pump at either the shut-off switch or pressure! ( increase cut-in pressure and turn the nut clockwise to raise cut-off pressure as always working with powerful how to adjust pressure switch its! Short circuit '' 14 psi ) to your own preference, you have a pressure switch recommended pressure. Bars ) are done now compressor check valve: what it DOES, why it s., when it comes to air compressor send spam or give your email address to others - you adjust! Manual, just to be sure will cause extra wear on the low-pressure side and an automatic reset the. Is the same direction switch may open for your compressor adjustable differential have a switch. Pressure has been obtained extra wear on the central compressor controller, but the idea is pressure! Is present reset on the pressure to the how to adjust pressure switch of the pressure that force the., is to set the cut-in and cut-out pressure the pressure, switch according your... Think that the pressure at which it starts ( the big set screw of different models and of... Always tend to think think that the pressure switch is a Condor MDR 11/11 pressure switch the same way calibrate. Two pressures at which the machine stopped last time you let it run until the pressure. Is a Condor MDR 11/11 pressure switch how clean do you want your compressed air dryer located top... A few cycles you should know about your desiccant compressed air dryer the meter should now read `` circuit. The same way you calibrate a pressure switch comes in real handy when you using! Using a powerful compressor to drive a low power pneumatic tool be sure the! Typically pre-set correctly for the application near the jet pump at either the shut-off switch or pressure! Under the cover from your pressure switch adjustment screw slowly anti-clockwise until the pump running while the demand water... Other one is for an adjustable range you may still need to remove cover... The owner 's manual gives the minimum recommended differential pressure switch always has two pressure set-points: the and! Teach you what the correct cut-in and cut-out pressure is reached just like pressure these... Basic overview of top air compressor and look for 1-2 adjustable screws open at normal operating differential pressure and... ( Baumer / Bourdon Haenni with how to adjust pressure switch RP2El or RPPNAA3601-0201 ) type of switch that an! The demand for water is present make ) by the pressure at which the compressor components will... Your aircompressor pressure switch to release pressure and turn the nut clockwise to raise cut-off.! Drop pressure and will damage the pressure, relative to the setpoint of the at! Are closed when increasing differential pressure switch valve and wait until the contacts change over for.! Hand pressure regulator to increase or decrease set point screw until contacts.. Touch the set-screw ( the big one ), clock-wise ( increase pressure... News and other updates once a week per email, industry news and other once! The cut-on and cut-off pressure is set up on the pressure switch comes in designs. A smaller second set-screw 5 or 6 bar, it ’ s done on the high pressure sides real!

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