Knowledge Base Technical Questions FAQ1. Questions Found. QUESTIONHow will installation of a Magnehelic gage 1. ANSWERAccuracy will not be affected, but response time will be increased in proportion to the length of the tubing. RELATED PRODUCTSSeries 2. 8 Mile Full Movie Download Mp4 on this page. Series 2. 00. 0 SPSeries 6. QUESTIONWhich Capsuhelic gage ports could be connected to the pressure source in liquid service ANSWERThe bottom ports. This allows bleeding of entrapped air from the top ports to eliminate reading error due to compression of entrapped air in the gage. Bleed fittings should be installed in the top ports. RELATED PRODUCTSSeries 4. QUESTIONCan a standard Magnehelic gage be used for natural gas or propane service ANSWERNo. As the silicone diaphragm will be attacked by these gases. A Buna N diaphragm should be specified. Air Sealing an Attic If you havent done it yet, its time to climb into your attic and plug as many holes as you can find. Bearnard isnt the only one who has experienced problems when replacing an air filter. We have all experienced it at some time or another. RELATED PRODUCTSSeries 2. Series 6. 05. Series 2. SPQUESTIONWhat happens when a Magnehelic gage equipped with the low temperature option is operated below 2. Fahrenheit 2. 9 degrees Celsius ANSWERBelow that temperature the accuracy of the gage deteriorates beyond our published specification due to stiffening of the diaphragm. RELATED PRODUCTSSeries 2. Series 6. 05. Series 2. SPQUESTIONMay a standard gage be reconfigured in the field from automatic to manual reset ANSWERYes. By simply making a wiring change on the relay terminal board per the information in the instruction bulletin. QUESTIONHow much may the published pressure and temperature specifications for Dwyer gages and controls be safely exceededANSWERPublished specifications may not be exceeded To do so will void the warranty as well as expose the customer, the stocking representative, and Dwyer Instruments to product liability action. AirFilter-Position-WEB.jpg' alt='How To Install Furnace Filter Air Flow Direction' title='How To Install Furnace Filter Air Flow Direction' />QUESTIONIs National Institute of Standards and Technology traceability available for the Magnehelic Gage ANSWERNo. But Magnehelic gages can be given a special 6 point calibration check with an NIST traceable master gage and a certificate can be supplied. RELATED PRODUCTSSeries 2. Series 6. 05. Series 2. SPQUESTIONHow do I hook up my Magnehelic Gage ANSWERIn Bulletin A 2. Magnehelic to the following applications positive pressure, negative pressure, and differential pressure. RELATED PRODUCTSSeries 2. Series 6. 05. Series 2. SPQUESTIONWhat approved accessories go with the Model TDL 1. ANSWERA number of approved accessories will greatly contribute to the featureset of the Model TDL 1. Please check the corresponding product page to view the list of available accessories. RELATED PRODUCTSModel TDL 1. QUESTIONWhat approved accessories go with the Model TDL 1. ANSWERA number of approved accessories will greatly contribute to the featureset of the Model TDL 1. Please check the corresponding product page to view the list of available accessories. RELATED PRODUCTSModel TDL 1. Model SM 1. 00. QUESTIONWhy must Dwyer pressure switches be mounted with the diaphragm in the vertical plane ANSWERIn other than a vertical plane, the diaphragm can sag and cause a shift in set point or a change in the adjustable set point range. The switch may even fail to reset at the minimum set points. Compare the best highefficiency gas furnaces in Canada, including prices, installation costs, best furnace brands, efficiency, and more. Get free quotesThis is the same phenomena that causes inaccuracy in Magnehelic and Capsuhelic gages when mounted in other than a vertical position. RELATED PRODUCTSSeries 2. Series 4. 00. 0QUESTIONHow can a standard 1. Celsius ANSWERUse metal tubing for sensing lines long enough to safely dissipate the heat. RELATED PRODUCTSSeries 1. QUESTIONDoes Dwyer offer a fully ULFMCSA approved explosion proof pressure switchChoosing HVAC Equipment for an EnergyEfficient Home If youre building a new green home, youll find that most available furnaces and air conditioners are oversized. ANSWERYes. The 1. G Series. RELATED PRODUCTSSeries 1. Series 1. 95. 0GQUESTIONCan the standard H2 pressure switch be used with water ANSWERNo. The brass or SS housing must be specified for compatibility reasons. The aluminum housing can leak into the switch. RELATED PRODUCTSSeries H2. QUESTIONWhat factor is used to correct for different flowmeter inlet pressureANSWERIf the flowmeter is exhausting to atmosphere, no correction factor is needed. If back pressure is present due to downstream plumbing or restrictions, this error can be corrected utilizing the conversion curves in our full line catalog or the following equation. Pressure Q2 Q1 x P1 x T2P2 x T1Where Q1 Observed Flowmeter Reading. Q2 Standard Flow Corrected for Specific Gravity. P1 Actual Pressure 1. Gage PressureP2 Standard Pressure 1. T1 Actual Temperature 4. R Temp FT2 Standard Temperature 5. R, which is 7. 0F. RELATED PRODUCTSSeries RMSeries VFCVFCIISeries MMSeries VFQUESTIONWhy are top mounted valves recommended for flowmeters used for vacuum service ANSWERTo maintain atmospheric pressure in the indicating bore and therefore preserve accuracy an inlet restriction would reduce pressure in the bore. This is essentially the opposite situation to outlet back pressure in a pressure system which increases pressure in the bore and also affects accuracy. Remember that all standard Dwyer flowmeters are calibrated for standard atmospheric pressure and temperature in the bore. RELATED PRODUCTSSeries MMSeries RMQUESTIONIs the Rate Master or Visi Float Flowmeter compatible with any media ANSWERThe Rate Master Flowmeter is manufactured from a polycarbonate plastic and the Visi Float Flowmeter is manufactured from acrylic. Compatibility charts need to be reviewed to determine if these materials of construction are compatible with your media. RELATED PRODUCTSSeries VFSeries RMSeries VFCVFCIIQUESTIONAre special ranges available for the Rate Master andor Visi Float Flowmeter ANSWERYes, other ranges are available which are not specified in our catalog. Please feel free to contact Dwyer with questions on these ranges. RELATED PRODUCTSSeries VFCVFCIISeries RMSeries VFQUESTIONWhat is the key feature of both Proximity position indicators and level switches that sets these products apart from all competitors ANSWERMagnetic coupling. RELATED PRODUCTSSeries Mark. Series PLSQUESTIONHi Flow control valves call out ANSI B1. Class IV flow leakage. What does this meanANSWERANSI B1. This specification has actually been superseded by ANSIFCI 7. Class IV. The class IV designation defines the allowable amount of leakage through the valve seat in the closed position. Class IV allows for. Cv, to pass through the seat. Class IV is common for metal to metal seated valves. RELATED PRODUCTSSeries 2. VA3. 00. 0WAQUESTIONWhat if I need parts for my Hi Flow control valve ANSWERMany Hi Flow valves have been in service for 1. However, since Hi Flow valves are commonly used in steam service, a severe application, some parts may wear over time. Unlike other control valves, Hi Flow valves are designed with removable seat rings making repair or replacement of components an option. Although all parts are available, you will probably never need more than a seat ring, plug assembly, and stem packing to have a valve that is like new. RELATED PRODUCTSSeries 2. VA3. 00. 0WAQUESTIONWhat two basic types of position indication are provided with the Proximity position indicator ANSWERVisual mechanical and electrical. RELATED PRODUCTSSeries VPISeries QVSeries Mark. QUESTIONHow many different size housings does Proximity provide for position indication How many switches in a single housing ANSWERTwo sizes 2 switch and 4 switch housings. RELATED PRODUCTSSeries QVSeries Mark. QUESTIONWhat two types of continuous signal feed back can Proximity provide with the position indicator ANSWERResistive potentiometer and current transmitter. RELATED PRODUCTSSeries Mark.