YK/SP/MY-8674863/dwyer-magnehelic-differential-pressure-gages-50-to-50-mmwc-500x500.jpg' alt='How To Install A Magnehelic Gauge Calibration' title='How To Install A Magnehelic Gauge Calibration' />Dust Collection Research Measurement.Duct Size Test. Testing Equipment Needed.Tape measure. Measure the inside diameter of the ducting to your larger machines.If it is not at least 6 all the way to those machines the best you can hope to do is get the same sawdust that you would get with a broom.Small pipe will not support the air volume at typical blower pressures needed to get all the fine dust at the source.Impeller Size Test.Testing Equipment Needed.Tape measure. This test simply measures the diameter of the impeller.The Vaisala HUMICAP Humidity and Temperature Transmitter HMT337 is delivered in one of three configurations Basic nonwarmed probe for moderate humidities.The easy way to do this is unplug the blower, use a tape measure and reach inside the shroud hooking on the end of a blade and measuring to the center, then doubling that radius.Once we have that diameter, the following blowerfan table will pretty closely tell what we can expect both in terms of CFM output and horsepower needs from our blowers.This table makes it pretty clear that for fixed speed hobbyist blowers impeller diameter is everything One very important thing to understand when testing small shop blowers is that blower technology is mature.This means that if you buy a blower from any of the leading manufacturers with the same size and type of impeller turned by a standard direct drive 3.RPM motor, you are going to get near identical airflow.Select the SERIES 2000 Magnehelic Gage for a versatile low differential pressure gage with a wide choice of 81 models and 27 options to choose from.Unfortunately, a good portion of the small shop dust collection blowers are cheap low quality imports which due to impeller, blower housing, inlet, and outlet construction just do not move as much air.As a result the below table shows the maximums you can expect from a given diameter impeller wheel.Amp Meter Tests. Caution The motor amperage test can be dangerous.Messing with large amperage circuits, particularly with 2.If you dont know how to do this test safely then get expert help Overview.The amp tests are normally done at the same times as you do your pressure tests and provide a way to ensure your system operates efficiently and does not burn up motors.These tests let you measure the maximum work that the blower does with and without overhead and compare that to the motor maximum amperage from its nameplate.DP/KI/MY-11767021/magnehelic-differential-pressure-gauge-500x500.jpg' alt='How To Install A Magnehelic Gauge Calibration' title='How To Install A Magnehelic Gauge Calibration' />Blowers with too large of an impeller try to move too much air, so the amperage reading will be well above the motors rated maximum amperage and can burn up the motor.Hobbyist dust collector blowers tend to be air starved and show an amperage reading well below maximum.Depending upon the motor service factor, we would increase impeller size on an air starved blower until our amp meter shows about 9.We need to carefully monitor motor amperage as we increase impeller size to ensure the blower does not try to move so much air it burns up the motor.Even if you have the ideal motor and impeller for your shop, that motor could still burn up if run too long without the overhead resistance of your ducting, filters, separators, etc.Another reason to monitor motor amperage is you can not trust hobbyist dust collector motor horsepower claims, particularly for air compressor and inexpensive import motors.These advertised values tend to be maximums during very short loads and startup, not working values.Trying to use one of these motors based on horsepower can easily burn it up, so you need to test carefully with an amp meter to ensure the safety of your system and shop.Testing Equipment Needed.Clamp on type AC amp meter.Harbor Freight, HD, Lowes, etc.Start by checking the motor nameplate to determine the maximum amperage.Write this down as motor rated amperage.We later use this amperage to ensure our system is not air starved or passing so much air it could burn up the motor.Blower Minimum Amperage.The first test is often done at the same time as the Max SP test and tells what amperage your motor uses when there is no airflow.Setup for this test by removing all ducting, separators, cyclones, and filters.Install a test pipe with a sealed end, or put a seal over the blower inlet.Attach your clamp on amp meter around one of the hot leads where you can easily read it.Turn on the blower and read the amperage.Record the number as minimum blower amps.This number becomes our target that we want for every sealed duct run to ensure no leakage.Blower Maximum Amperage.The second test continues with all disconnected and measures the motor amps when it does the most work.We often do this test at the same time as we do our minimum SP test for CFM to measure the maximum possible airflow.This is often the CFM value that vendors use in their advertisements and tends to be about double what we get with the resistance of our ducting, hoods, filters, separator and cyclone.In addition to telling us how much danger there is to our motor if all is left wide open, if the amperage swings back and forth on this test, we know we have a design problem, often a poor blower spiral or blockage in a cyclone.To do the test attach the test tube, turn on the motor and get a good amp reading then turn it off.Do not run the motor for more than 1.Most well designed systems will show more amps than the motor rating.Record this number as blower maximum amps.Full System Maximum Amperage.The third test reconnects the blower to your whole dust collection system and filters then again measures amperage with all blast gates open.This test makes sure that with all gates wide open, you are not going to burn up your motor.Record this number as maximum system amps and keep that value with your system.This value is what you compare against on future tests to easily detect leaks and clogs in your installed system.If you know it normally pulls 1.If it pulls 1. 1 1.Amperage Test Results.Using an amp meter and my gauges showed a 1.CFM needed to capture the fine dust at our larger machines.This unit is not ample to drive permanent ducting for a small one car garage sized shop without an impeller upgrade.A 1. 2 impeller upgrade pushes that sized motor right to the limit so the amps need to be watched closely.Rather than risk burning up that motor, most instead go with a 2 hp dust collector with a 1.This same testing shows that the 2 hp dust collector solution is too small to power the average ducting for a two car garage sized shop without an upgrade to a 1.Adding the additional resistance overhead required to power a cyclone pushes the needed impeller size to 1.Because motors come in 2 hp or 3 hp sizes, I used a 3 hp motor for mine.Most with normal sized shops will be well served by a 1.With the ducting overhead in my larger shop, the 3 hp motor left enough extra capacity to permit my upgrading to a 1.Leak Test. Testing Equipment Needed.Punk, incense stick, or cotton rope lighter.One of the easiest ways to check a new cyclone for leaks is to seal off the openings and fill it with water.My friend said his first cyclone looked like Old Faithful when filled up I next tested to find and seal the leaks in my whole system.For safety I first emptied the dust then used a piece of cotton rope lit on one end.I could have used a fireworks punk or incense stick. Adobe Reader 9 Commenting Not Allowed On Airplanes . With all blast gates closed and the blower running I moved smoke over each suspect joint in my cyclone, blower, and ducting.Leaks inhaled the smoke and big leaks fanned the fire to make it glow brightly.There is no danger of a motor overload during this test.As shown in our amp tests, the motor does the least work with no airflow.Unlike some vacuum cleaners, blower motors use induction motors with independent cooling fans, so in spite of the noise, it does not hurt a radial fan blower or motor at all to run with all gates closed and no airflow this is not true for airfoil impellers.Sealing Leaks. Metal ducts, cyclones, and even blowers leak terribly.You can seal these leaks with a special mastic backed aluminum tape or use a special sealing compound.The lightweight aluminum foil tape sold at the box stores easily tears and leaks if the ductwork moves.I recommend the heavier mastic backed metal tape from Hardcast Carlisle, Aluma grip AFT 7.I also recommend Hardcast Carlisle DS 3.HVAC wholesaler. You can also use the Eco EZ seal 4.M commercial windshield adhesive available from automotive wholesalers.Use the metal tape on joints and the high velocity duct sealant on seams.Most other sealants stick poorly to galvanized metal, so dont get talked into using something else, particularly silicon caulk.Silicone caulk appears at first to stick well.Magnehelic Gauges Review Wiki Definition, Working Principle Calibration of Differential Pressure Gauges.If this takes more than 5 seconds data loadingclickheretxtClick Here data tab height3.In industries like HVAC where monitoring the air pressure difference between two locations is of vital importance, the need for a reliable and accurate means to measure differential pressure is needed.There are several ways you can measure pressure but the simplest, and probably the best, way to measure this value is through the use of a magnehelic gauge.Recommended Product.If this takes more than 5 seconds data loadingclickheretxtClick Here data tab height3.What is a Magnehelic Gauge The simplest magnahelic gauge definition is that its an instrument used to measure pressure.It is mainly used in measuring positive or negative pressure also known as vacuum it also used to get the difference in pressures between two separate locations.The magnahelic differential pressure gauge, or just magnahelic gauge for short, is the pressure gauge developed by Dwyer that can accurately measure pressure and pressure differences.In fact, the magnahelic gauge has set the industry standard in pressure gauges, and through the years Dwyer has been consistently raising the bar a little higher.Dwyer, ever since the company got started in 1.Dwyer Magnehelic Gauge Specifications.Housing The outer casing of the magnehelic differential pressure gauge is made of tough, die cast aluminum, and powder coated gray.It can withstand up to 1.Accuracy The magnehelic gauge can measure pressure difference at an outstanding accuracy of just plus or minus 2 at full scale.Operating temperature Magnehelic pressure gauges can operate efficiently between 2.Fahrenheit without losing accuracy, although this is just for the standard models.There are lower temperature models available upon request.What Makes the Magnehelic Gauge Different from other Pressure Gauges.The thing that makes these gauges the best is that they incorporate the magnehelic principle developed by Dwyer.This principle gets rid of the problems that plague most of the other pressure gauges, problems like excessive wear, backlash, and toxicity.This results in a high quality, durable, and accurate gauge.Less Wear and Tear The magnehelic principle is the patented method of transmitting the effects that air pressure has on a thin diaphragm to the indicator needle using only a magnetic linkage.This is the main difference that magnehelic differential pressure gauges have over the other gauges that use mechanical means to transmit the readings.This lack of physical contact between the parts mean that there is no wear inside the system that can affect the instruments accuracy in any way.Fluid less Design There are numerous advantages to using Magnehelic gauge.Because there is no fluid present inside the instrument, the problems regarding accuracy loss due to evaporation or freezing is thereby eliminated.It also poses no risk of toxic contamination if the gauge gets damaged.The Magnehelic principle used in making these gauges also ensure a drift free pointer movement that is not affected whatsoever by inertia.High Durability A magnehelic pressure gauge is extremely tough as well, considering the fact that it is a highly sensitive measuring instrument.It can resist a respectable amount of shock and vibration, it is also relatively unharmed even when subjected to pressure surges of up to 1.Fahrenheit. Easy Calibration and Installation It is also a lot easier to calibrate a Dwyer Magnehelic gauge.The hoses just need to get disconnected and using the accessible adjusting screw on the cover, make the necessary adjustments until the needle points at zero.Installation is also a breeze, since the gauge is unaffected by gravity there is no need to install it at a level position.Affordability Despite being the best differential pressure gauge available in the market, the Dwyer Magnehelic gauge is very affordable.Though it employs cutting edge technology to give users the most accurate pressure reading, it is still one of the most cost effective instruments sold right now.Starting at just 5.Applications of the Magnehelic Gauge.There are various applications where there are needs for an accurate pressure reading.Magnehelic gauges are commonly used in HVAC applications they are used to measure fan and blower pressures.They can also tell whether the air filters need replacement or not.These gauges also have medical applications, like monitoring air pressure in hospital respiratory apparatus and checking the air pressure in clean rooms.Basically any application that needs an accurate pressure reading can benefit from the use of a magnehelic gauge.Other Dwyer Products.Though Dwyer is known for the cutting edge magnehelic gauge, they also offer other gauges and instrumentation equipment that have the same level of dependability.The most notable of these is the Dwyer photohelic gauge.This gauge operates on the same principle as the magnehelic gauge, and it also offers the same kind of accurate readings and durability you can expect from a Dwyer product.The main difference between photohelic and magnehelic gauges is that they can also function as switches by using two relays inside the gauge, it is possible to set the low and high pressure limits to control blowers.Recommended Product.If this takes more than 5 seconds data loadingclickheretxtClick Here data tab height3.Where to Get the Dwyer Magnehelic Gauge.These gauges are available in all certified distributors they can also be purchased online at the official Dwyer website or in online shopping portals like Amazon.You can find these magnehelic and photohelic gauges from Dwyer through amazon.Magnehelic Differential Pressure Gauges.Before the magnehelic gauge came along, gauges were notorious for having a high degree of error in measuring the amount of pressure, and they are all very fragile instruments that need a very controlled environment to function properly.When the magnehelic gauge came along it changed the game entirely.It is highly durable that even after getting subjected to shock, vibrations and fluctuations in pressure and temperature it can still give pressure readings that are accurate within 2.The Dwyer Magnehelic differential pressure gauge definitely sets the standard in accuracy and dependability in controls and instrumentation.Recommended Product.If this takes more than 5 seconds data loadingclickheretxtClick Here data tab height3.Most Popular Related Posts.If this takes more than 5 seconds data loadingclickheretxtClick Here data tab height3.
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