Home

manual - ControlsAndMeters.com

image

Contents

1. Dwyer GPH O WATER ta tn y 4 LALALALA _ fp Series RM Rate Master Flowmeters Specifications Installation and Operating Instructions Bulletin F 43 Dimensions in Inches Centimeters Model RMA Model RMB Model RMC 4 9 16 11 59 8 1 2 21 59 15 1 8 38 42 3 7 62 1 8 NPT CONN 6 7 16 16 35 1 4 NPT CONN 12 1 4 31 12 1 2 NPT CONN 1 5 8 3 17 10 32 Thds 3 15 16 8 56 1 4 20 Thds 8 3 4 10 72 10 32 Thds 3 8 95 5 8 1 59 1 2 54 1 1 16 2 60 1 7 8 3 42 2 3 4 5 83 1 3 16 2 73 1 3 4 3 29 2 1 4 5 33 3 4 1 91 1 2 54 1 7 16 2 98 1 2 54 1 7 16 2 98 1 31 82 3 51 1 3 8 3 49 1 13 16 4 60 2 1 2 6 35 3 4 1 91 1 1 4 3 18 2 5 08 4 13 16 12 22 8 3 4 22 23 15 3 8 39 05 I l l 1 2 54 1 1 2 3 81 2 1 4 5 72 PANEL CUTOUT FOR FLUSH MOUNTING Dwyer Series RM Rate Master Flowmeters are furnished in three models see Fig 2 each available in a broad array of flow ranges with direct reading scales for air gas or water Installation operation and main tenance are very simple Only a few common sense precautions must be observed to assure long trouble free service CAUTION Dwyer Rate Master Flowmeters are designed to provide sat isfactory lon
2. omitting the clamp bolts and supporting the flowmeter solely on the connecting piping is possible For this method extra long or straight pipe threads should be used so that nuts may be run onto the pipe and later tightened against the back of the panel to retain the unit in proper position Use appropriate hole layout in formation from Fig 2 but omit the small holes Surface Mounting on Piping Only Without Panel For a temporary or laboratory type installation the panel may be omitted altogether and the flowmeter installed directly in rigid piping Its light weight permits this with out difficulty OPERATION To start system open valve slowly to avoid possible damage Control valves on BV and SSV models are turned clockwise to reduce flow counter clockwise to increase flow A nylon insert is provided in the thread ed section of the valve stem to give a firm touch to valve and to prevent change of setting due to vibration The performance of low range units used in air or gas applications may be affected by static electricity Excessive static charge may cause the ball float to behave erratically or provide a false reading To ensure the proper function of the unit the application should be designed to minimize or dis pel static electricity The standard technique for reading a Variable Area Flowmeter is to locate the highest point of greatest diameter on the float and then align that with the theoretical center of the scale graduat
3. the flowmeter See Fig 3 Pull the flowmeter body gently forward away from the back plate to avoid undue strain on the body Leave the piping con nections intact There is no need to disturb them See Fig 4 3 Threaded body style flowmeters Remove the slip cap with a push on a screwdriver as shown in Fig 5 Remove the plug ball stop as shown in Fig 6 using allen wrench sizes as follows Model RMA 1 4 Model RMB 1 2 and Model RMC 3 4 Threadless body style flowmeters Release the plastic retaining clip with a screw driver Figure 5B it will unclip from the valve body TMV Option or the plug ball stop slide the clip back until the valve body or ball stop can be removed The clip will remain in the body for convenience Using a screwdriver gently lift up on the plug in the groove as shown in Figure 6B until the o ring seal is released and remove the plug For the TMV option gently pull up on the valve knob to release the valve body seals and remove the valve 4 Take out the ball or float by inverting the body and allowing the float to fall into your hand as shown in Fig 7 Note It is best to cover the dis charge port to avoid losing the float through that opening Cleaning The flow tube and flowmeter body can best be cleaned with a little pure soap and water Use of a bottle brush or other soft brush will aid the cleaning Avoid benzene acetone carbon tetrachloride alkaline deter gents caustic soda liquid soap
4. MENTS INC P O BOX 373 MICHIGAN CITY IN 46361 U S A G he l m OPEN H Fig 2 i HIGH WIDE 4 5 8 11 75 7 8 2 22 8 9 16 21 75 1 5 16 3 33 15 3 16 38 58 2 1 16 5 24 PANEL HOLE SIZES FOR SURFACE MOUNTING 7 16 1 11 1 4 0 64 5 8 1 59 9 32 0 71 15 16 2 38 13 82 1 03 PIPE BOLT Inlet Piping Run It is good practice to approach the flowmeter inlet with as few elbows and restrictions as possible In every case the inlet piping should be at least as large as the connection to the flowmeter i e 1 8 Iron Pipe Size for RMA models 1 4 IPS for RMB models 1 2 IPS for RMC models Length of inlet piping makes little difference for normal pressure fed flowmeters For flowmeters on vacuum air service the inlet piping should be as short and open as possible This will allow operation near atmospheric pressure and thereby insure the accuracy of the device Note for vacuum air ser vice the flow control valve if any should be on the discharge side of the flowmeter Either the TMV unit or a separate in line valve may be applied Discharge Piping As on the inlet discharge piping should be at least as large as the flowmeter connection Also for pressure fed flowmeters on air or gas service the discharge piping should be as short and open as possible This will allow operation of the flow tube at near atmospheric pressure and insure the accuracy of the device This is
5. g term service when used with air water or other compatible media Refer to factory for information on questionable gases or liquids Avoid solutions of acids bases or salts having a pH below 5 0 or above 8 5 Caustic solutions antifreeze ethylene glycol and aromatic solvents should definitely not be used Calibration Each Rate Master Flowmeter is calibrated at the factory If at any time during the meter s life you wish to re check its calibration do so only with devices of certified accuracy DO NOT attempt to check a Rate Master Flowmeter with a similar flowmeter as seemingly unimportant variations in piping and back pressure may cause noticeable differences in the indicat ed reading If in doubt return your Dwyer Rate Master Flowmeter to the factory Its calibration will be checked for you at no charge Before pro ceeding with installation check to be sure you have the Rate Master model and flow range you require LOCATION Temperature Pressure Atmosphere and Vibration Dwyer Rate Master Flowmeters are exceptionally tough and strong They are designed for use at pressures up to 100 psi 6 89 bar and tempera tures up to 130 F 54 C DO NOT EXCEED THESE LIMITS The installation should not be exposed to strong chlorine atmospheres or solvents such as benzene acetone carbon tetrachloride etc The mounting panel should be free of excessive vibration as it may prevent the unit from operating properly DWYER INSTRU
6. ion In the event that the float is not aligned with a grad an extrapolation of the float location must be made by the operator as to its location between the two closest grads The fol lowing are some sample floats shown with reference to the proper location to read the float Variable Area Flowmeters used for gases are typically labeled with the pre fix S or N which represents Standard for English units or Normal for metric units Use of this prefix designates that the flowmeter is calibrated to operate at a specific set of conditions and deviation from those stan dard conditions will require correction for the calibration to be valid In prac tice the reading taken from the flowmeter scale must be corrected back to standard conditions to be used with the scale units The correct location to measure the actual pressure and temperature is at the exit of the flowme ter except when using the Top Mounted Valve under vacuum applications where they should be measured at the flowmeter inlet The equation to cor rect for nonstandard operating conditions is as follows Q Q X P x Te P2x Tu Where Qi Actual or Observed Flowmeter Reading Q Standard Flow Corrected for Pressure and Temperature Teflon is a registered Trademark of E I DuPont Company Copyright 2005 Dwyer Instruments Inc Printed in U S A 9 05 P Actual Pressure 14 7 psia Gage Pressure P2 Standard Pressure 14 7 psia
7. of less importance on water or liquid flowmeters as the flowing medium is generally incom oressible and moderate back pressure will not affect the accuracy of the instrument as calibrated POSITIONING AND MOUNTING All Rate Master Flowmeters must be mounted in a vertical position with inlet connection at the bottom rear and outlet at the top rear Bezel or Through Panel Mounting Make pane cutout using appropri ate dimensions from Fig 2 Flowmeter must fit into panel freely without forcing or squeezing Insert the flowmeter from the front of the panel and install the mounting clamps from the rear Insert and tighten the clamp bolts in the locations shown in Fig 3 Do not exceed 5 in lbs Make con nections to inlet and outlet ports using small amount of RTV sealant or Teflon thread tape to avoid leakage Avoid excess torque which may damage the flowmeter body Phone 219 879 8000 www dwyer inst com Fax 219 872 9057 e mail info dwyer inst com MOUNTING BRACKET SCREW 4 REQUIRED Surface Mounting Drill appropriate holes in panel using the dimensions shown in Fig 2 Hold the flowmeter in position in front of the panel and install the clamp bolts from the rear The mounting clamps may be used as washers if desired by installing them backwards or straightening them out Pipe up inlet and discharge following the directions in the previous sections Surface Mounting on Piping Only An alternate method of surface mounting
8. s which may contain chlorinated solvents etc Also avoid prolonged immersion which may harm or loosen the scale Reassembly Simply reverse steps 1 through 4 and place the flowmeter back in service A little stopcock grease or petroleum jelly on the O rings will helo maintain a good seal as well as facilitate assembly No other spe cial care is required FR 56 440197 00 Rev 16
9. which is O psig T Actual Temperature 460 R Temp F Ts Standard Temperature 530 R which is 70 F Example A flowmeter with a scale of 10 100 SCFH Air The float is sitting at the 60 grad on the flowmeter scale Actual Pressure is measured at the exit of the meter as 5 psig Actual Temperature is measured at the exit of the meter as 85 F Q 60 0x 14 7 5 x 530 14 7 x 460 85 Q 68 5 SCFH Air CAUTION Do not completely unscrew valve stem unless the flowmeter is unpressurized and drained of any liquid Removal while in service will allow gas or liquid to flow out the front of the valve body and could result in seri Ous personal injury For applications involving high pressure and or toxic gases or fluids special non removable valves are available on special order Please contact factory for details MAINTENANCE The only maintenance normally required is occasional cleaning to assure reliable operation and good float visibility Disassembly The flowmeter can be disassembled for cleaning simply as follows 1 Remove valve knob from RMB or RMC BV or SSV units by pulling the knob forward It is retained by spring pressure on the stem half shaft so that a gentle pull will remove it On RMA BV or SSV models turn the valve knob counter clockwise until the threads are disengaged Then withdraw the stem from the valve by gently pulling on the knob 2 Remove the four mounting bracket screws located in the sides of

Download Pdf Manuals

image

Related Search

Related Contents

Accuview 10.4"  Onkyo TX-DS676 Stereo System User Manual  Specifications - All Shore Industries    

Copyright © All rights reserved.
Failed to retrieve file