{"id":3354,"date":"2026-09-29T05:09:51","date_gmt":"2026-09-28T21:09:51","guid":{"rendered":"http:\/\/www.alihsolar.com\/blog\/?p=3354"},"modified":"2026-09-29T05:09:51","modified_gmt":"2026-09-28T21:09:51","slug":"what-are-the-signs-of-a-faulty-pressure-sensor-in-a-screw-gas-compressor-49c2-f0e9ac","status":"publish","type":"post","link":"http:\/\/www.alihsolar.com\/blog\/2026\/09\/29\/what-are-the-signs-of-a-faulty-pressure-sensor-in-a-screw-gas-compressor-49c2-f0e9ac\/","title":{"rendered":"What are the signs of a faulty pressure sensor in a screw gas compressor?"},"content":{"rendered":"

Hey everyone, I\u2019m Alex\u2014been working as a screw gas compressor supplier for over a decade, so I\u2019ve seen just about every small issue turn into a big headache when it comes to these machines. The pressure sensor is one tiny part that people sleep on, right? It\u2019s like the thermostat in your house: if it\u2019s off, your whole system starts acting wonky, and before you know it, you\u2019re dealing with frozen pipes or sky-high energy bills. But with screw gas compressors, a faulty pressure sensor isn\u2019t just annoying\u2014it can kill productivity, waste money, and even lead to unexpected downtime that makes your whole operation grind to a halt. Screw Gas Compressor<\/a><\/p>\n

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I\u2019ve had customers call me at 2 a.m. freaking out because their compressor\u2019s not pumping the right pressure, only to find out the sensor was fried, not the whole unit. That\u2019s the thing about pressure sensors\u2014they don\u2019t just die dramatically. They throw tiny, easy-to-miss signs at first, and if you ignore them, you\u2019re in for way bigger problems. So today, I want to break down the real, relatable signs you should keep an eye on if you run or work with screw gas compressors. No jargon, no fancy tech terms you can\u2019t wrap your head around\u2014just stuff I\u2019ve actually witnessed on job sites and field calls over the years.<\/p>\n

First up, let\u2019s talk about the most obvious one that\u2019s hard to miss: erratic pressure readings on the display. You walk over to the compressor, glance at the gauge, and it\u2019s jumping all over the place\u2014like, one second it\u2019s at 100 PSI, next it\u2019s spiking to 150, then dropping to 70 before settling for a second. And it\u2019s not just a tiny blip here or there; it\u2019s constant, even when your process load is steady. I had a customer last month in food and beverage (they use compressors to power packaging lines, super sensitive to pressure) who thought his line was faulty because the pressure gauge was fluctuating. Turned out the sensor had a loose wiring pin that was sending wonky signals to the display. We tightened it, and boom\u2014steady pressure, no more line stops.<\/p>\n

Wait, but here\u2019s a catch: sometimes it\u2019s not the display itself. Like, the actual discharge pressure from the compressor might be normal, but the gauge is lying. That\u2019s where a lot of people mess up. You can\u2019t just trust the onboard screen\u2014do a manual check with a calibrated pressure gauge you know is accurate, and if there\u2019s a 10-15 PSI gap or more between the two, your sensor\u2019s probably the culprit. I always tell my customers: don\u2019t just rely on the compressor\u2019s built-in numbers. Cross-verify every few weeks, because that gap is a dead giveaway the sensor is out of whack.<\/p>\n

Next, weird energy spikes that don\u2019t make sense. Screw compressors are big energy hogs, but if your power bill jumps 15-20% for no obvious reason\u2014like you didn\u2019t add more equipment, your shift schedule didn\u2019t change, and all other motors are running normal\u2014that\u2019s a red flag. Here\u2019s why: when the pressure sensor is wrong, the compressor\u2019s control panel (the brain of the unit) is getting bad data. If it thinks the pressure is higher than it actually is, it\u2019ll throttle back the compression less than it needs to, forcing the motor to work harder to maintain pressure that doesn\u2019t exist. Or if the sensor reads lower than real, the panel will crank up the compressor\u2019s speed unnecessarily, wasting energy and wearing parts out faster.<\/p>\n

I had a small manufacturing client a few years back who noticed their electricity bill went up $800 in two months, and they couldn\u2019t figure out why. Their line foreman tried adjusting the compressor\u2019s settings, but it didn\u2019t help. When I went out, we checked the sensor\u2014it was miscalibrated by 25 PSI, so the compressor was running at full capacity 24\/7 even when their production line only needed half that. Replacing the sensor brought the energy use right back down, and we saved them that $800 a month, easy. That\u2019s the thing about hidden signs\u2014they add up fast to real cash lost.<\/p>\n

Another big one: the compressor is hitting safety alarms way too often (or not often enough). Every screw gas compressor has built-in safety features that trigger an alarm if pressure gets too high or too low, right? If the sensor is faulty, it can send false signals that trigger these alarms for no reason. I\u2019ve seen machines shut down mid-shift because the sensor said discharge pressure was 200 PSI when it was actually only 130, just because the sensor\u2019s internal diaphragm was cracked and throwing bad readings. That\u2019s a nightmare for production\u2014losing 2 hours of a night shift means thousands in lost orders, especially if you\u2019re in a just-in-time supply chain.<\/p>\n

On the flip side, a faulty sensor can also miss high or low pressure when it\u2019s actually dangerous. That\u2019s way scarier. A sensor that\u2019s underreporting pressure might let your compressor run with way too much internal pressure, leading to seal leaks, overheating, or even damage to the rotors. I had a customer in the chemical industry a while back who almost had a rotor failure because his sensor was reading 50 PSI low\u2014by the time we caught it, the rotor edges were worn down, and he had to do an unplanned overhaul that cost way more than a sensor replacement. So it\u2019s not just downtime and money\u2014there\u2019s safety involved here too.<\/p>\n

Then there\u2019s the \u201cweird noise\u201d sign that a lot of guys brush off as just part of the compressor\u2019s normal hum. Screw compressors have a smooth, steady tone when everything\u2019s working right. If it starts making a racket\u2014like high-pitched squealing, or deep grinding that\u2019s not usual\u2014check the pressure sensor. Wait, why? Because if the sensor is off, the control panel can\u2019t adjust the compressor\u2019s unloader valves or speed correctly. Unloader valves are what release excess pressure when demand is low, right? If the sensor says pressure is higher than it is, the valves won\u2019t open when they should, so excess pressure builds up, making the compressor work harder and cause that uneven, loud noise.<\/p>\n

I once worked with a mechanic who swore it was the compressor\u2019s bearings that were making noise, but when we checked, the bearings were fine\u2014just worn from constant overworking because the sensor was failing. Replacing the sensor fixed the noise, and the bearings lasted another two years instead of needing replacement a month later. So don\u2019t ignore that off noise; it might be a heads-up about the sensor, not just moving parts.<\/p>\n

Wait, let\u2019s talk about when it\u2019s not super obvious, like gradual performance drop. Your compressor used to hit its rated discharge pressure in 30 seconds, now it takes a minute and a half. It used to keep up with your production line, now you have to slow the line down because pressure can\u2019t keep up. That\u2019s a slow creep, not a sudden change, so easy to write off as \u201cthe machine is getting older\u201d or \u201cwe need a tune-up.\u201d But I\u2019ve fixed so many cases where the sensor was starting to degrade, sending slightly low pressure readings, so the compressor slowly ramps up its speed without actually reaching the needed pressure. Over time, that adds up to 10-15% less overall capacity, just because of a $50 sensor.<\/p>\n

I had a 15-year-old compressor that a customer was convinced was \u201con its last legs\u201d when in reality, the pressure sensor was just getting old and less accurate. We replaced it, and the compressor was back to 98% of its rated capacity in a day\u2014saved them from buying a whole new unit for years. That\u2019s a big one for small to medium businesses that can\u2019t drop $50k on a new compressor every 10 years.<\/p>\n

Now, let\u2019s be real\u2014sometimes these signs overlap. You might have erratic readings, plus energy spikes, plus random alarms. That\u2019s a clear sign it\u2019s time to check the sensor, not something else. But here\u2019s my pro tip as a supplier: don\u2019t wait for all the signs to hit. Do regular checks on the sensor every 6 months, or after any big maintenance job. Calibrate it at least once a year, same as you would other critical parts. A $200 calibration and $150 sensor if it\u2019s bad is way cheaper than unplanned downtime, emergency repairs, or lost production.<\/p>\n

And if you\u2019re noticing any of these signs, don\u2019t mess around. A lot of people try to \u201cwait and see\u201d if it\u2019s the sensor or something more, but that\u2019s how small issues blow up. I\u2019ve seen customers put off replacing a faulty sensor for 3 months, only to have the compressor\u2019s rotor seize up and cost them $20,000 in repairs. That\u2019s a no-brainer, right?<\/p>\n

As your screw gas compressor supplier, I always tell my clients that the pressure sensor is one of the most underrated parts of the whole unit. It doesn\u2019t move, it\u2019s small, but it controls so much of how your compressor runs\u2014energy use, productivity, safety, all of it. Ignoring the signs isn\u2019t just bad maintenance; it\u2019s throwing money down the drain.<\/p>\n

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If you\u2019re dealing with any of these issues right now, or you just want to make sure your sensors are in good shape to avoid headaches later, reach out to our team. We can help you troubleshoot whether it\u2019s the sensor or another part, supply high-quality sensors that fit all major screw compressor models, and even help with calibration if you need it. No pushy sales stuff, just honest advice from people who\u2019ve been in the game for years.<\/p>\n

High Pressure Piston Compressors<\/a> References:<\/p>\n

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  1. Compressed Air Gas Institute. (2021). Common Faults in Rotary Screw Compressors and Mitigation Strategies. CAHI Technical Bulletin 12-21.<\/li>\n
  2. Honeywell Industrial Automation. (2022). Pressure Sensor Performance Degradation: Field Observations and Best Practices. Industrial Sensor Application Note AN-PRS-007.<\/li>\n
  3. Machinery Lubrication Magazine. (2020). Hidden Causes of Energy Waste in Industrial Compressed Air Systems. Issue 18, Pages 22-27.<\/li>\n<\/ol>\n
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    Shanghai Sollant Energy Saving Technology Co., Ltd.<\/a>
    As one of the most professional screw gas compressor manufacturers and suppliers in China, we’re featured by quality products and good service. Please rest assured to buy bulk durable screw gas compressor from our factory. Welcome to view our website for more information.
    Address: No.215, Songri Center, Beihongqiao, Jiading District, Shanghai, China.
    E-mail: info3@sollant.com
    WebSite:     https:\/\/www.sollant-gas.com\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

    Hey everyone, I\u2019m Alex\u2014been working as a screw gas compressor supplier for over a decade, so … What are the signs of a faulty pressure sensor in a screw gas compressor?<\/span>Read more<\/a><\/p>\n","protected":false},"author":920,"featured_media":3354,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[3317],"class_list":["post-3354","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-industry","tag-screw-gas-compressor-443e-f1dd06"],"_links":{"self":[{"href":"http:\/\/www.alihsolar.com\/blog\/wp-json\/wp\/v2\/posts\/3354","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.alihsolar.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.alihsolar.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.alihsolar.com\/blog\/wp-json\/wp\/v2\/users\/920"}],"replies":[{"embeddable":true,"href":"http:\/\/www.alihsolar.com\/blog\/wp-json\/wp\/v2\/comments?post=3354"}],"version-history":[{"count":0,"href":"http:\/\/www.alihsolar.com\/blog\/wp-json\/wp\/v2\/posts\/3354\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/www.alihsolar.com\/blog\/wp-json\/wp\/v2\/posts\/3354"}],"wp:attachment":[{"href":"http:\/\/www.alihsolar.com\/blog\/wp-json\/wp\/v2\/media?parent=3354"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.alihsolar.com\/blog\/wp-json\/wp\/v2\/categories?post=3354"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.alihsolar.com\/blog\/wp-json\/wp\/v2\/tags?post=3354"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}