Instromet
RABO
®
Rotary Gas Meter
Instruction Manual
Страница 1: ...Instromet RABO Rotary Gas Meter Instruction Manual ...
Страница 2: ...ng a mechanical index The RABO meter has no wearing parts because precision clearances between the impellers and meter body are maintained by timing gears which are designed to enhance long term accuracy Combining adequate filtration and periodic maintenance a RABO meter will remain accurate over many years As the left impeller rotates toward the vertical position gas enters the cavity created bet...
Страница 3: ...until installation If prolonged storage is experienced RABO meters should be tested for accuracy before installation 5 Installation Elster RABO meters can be installed in horizontal or vertical top inlet piping configurations Vertical top inlet piping is preferred because it enables the meter to pass contaminants more freely through the meter All piping should be properly supported and aligned to ...
Страница 4: ...eter body when tightened 9 Level meter to within 1 16 per foot in all directions and tighten flange bolts evenly maximum 80ft lbs c Adding Oil WARNING Add oil only to the index end of the meter 1 Ensure gas valves are closed and meter and piping are depressurized WARNING Failure to depressurize the meter prior to removing meter and or components could result in personal injury and or property dama...
Страница 5: ...ure data can be compared a Proving When testing a meter on a prover the meter temperature pressure and volume are necessary inputs for the proving device The meter temperature is obtained by a temperature probe installed near the inlet of the meter A thermowell can be installed in the meter run piping or on the meter itself to facilitate installation of the temperature probe The meter pressure sho...
Страница 6: ...f flow if possible Differential pressure tests at flow rates under 25 are hard to interpret because the meter differential pressure at the lower flow rates is quite small The error in measurement is almost as large as the reading itself The meter differential pressure is also a function of line pressure and increases as line pressure increases Testing the meter at the same conditions line pressure...
Страница 7: ...00 940 51 700 1 460 50 3 4 15 300 430 24 000 680 39 300 1 110 61 200 1 730 60 4 1 17 700 500 27 800 790 45 500 1 290 70 700 2 000 75 5 2 21 200 600 33 400 950 54 600 1 550 85 000 2 410 100 6 9 27 200 770 42 700 1 210 69 900 1 980 108 700 3 080 150 10 3 39 100 1 110 61 400 1 740 100 400 2 840 156 300 4 430 175 12 1 45 000 1 270 70 700 2 000 115 700 3 280 180 000 5 100 250 17 2 62 800 1 780 98 700 2...
Страница 8: ...aviolet resistant Lexan cover requires no maintenance and is completely isolated from gas pressure a Rotatable The RABO index can rotate 355 degrees to facilitate desired reading angle depending on the installation orientation To rotate simply grasp the index with both hands and turn to the desired position ANSI Class 125 150 flat face flange connection F D E H G J A B C 2 36 60 2 36 60 M6x1 b How...
Страница 9: ...ndard conditions scfh d Removal Installation and Replacement Steps to replace the RABO meter index 1 Cut the seal wires and remove from the holes Figure 11 2 Remove unscrew the two brass screws on the sides of the index cover Figure 11 5 Remove the three index retaining screws using a Torx T20 driver Figure 13 Figure 13 Index retaining screws INDEX RETAINING SCREW INDEX RETAINING SCREW INDEX RETAI...
Страница 10: ...tection II 2 G EEx ia 2C T4 Figure 16 IN S10 pulser installed Figure 15 Index change gear and locking collar 8 Install the replacement index Orient the index so the mounting holes line up with the posts in the base plate Carefully ensure the shaft on the magnet holder is in the support hole on the index frame Figure 13 Install the three screws to retain the index to the base plate Tighten to snug ...
Страница 11: ... 10mm deep Heavier equipment should be pipe or wall mounted adjacent to the meter Elster provides customized brackets for commonly used equipment Figure 21 Please contact your local Elster representative for details NPT AUXILIARY PORTS Figure 18 Auxiliary ports Figure 20 Vertical installation 13 Thermowell All RABO meters come equipped with two 2 NPT auxiliary ports on the meter body Figure 18 whi...
Страница 12: ...for the most current product information Elster and Elster Logo are trademarks of Elster American Meter Company LLC EAM IM5910 11 14 About Elster Gas Elster provides best in class measurement and regulation products systems and solutions for the safe control and delivery of natural gas across the globe Trusted Brands Elster American Meter Company LLC Elster Perfection Corporation Elster Instromet ...
