Metreg MQM - Installation; Installation Recommendations

Rangeability and pulse weighting data
*)Theabsolutenumberofthepulsesdependsonthemetersizeandtheindividualmeteritself.
Thestatedvaluesareoftypicalsize.Exactvaluesdeterminedbycalibrationofthemeterare
located on the nameplate.
7. Installation
Recommendations and requirements for the installation of the MQM Quantometer:
•
Preferably,themetershouldbeinstalledhorizontally,withindexheadupward.
•
Straightinletpipe≥5DNandoutletpipe≥1DNinthenominalpipediameter
is recommended for high accuracy.
•
Ensure that the gas ow is in the same direction as shown by the arrow
at the meter housing.
•
Avoid heavy vibrations and pulsations in the point of measurement.
 Installationofasuitablecompensatorcaneectivelydampdownthiskindofdisturbance.
•
Drasticchangesinthegasowaswellasstronglypulsatingowwillincreasethe
measuring error. They arise for example during frequently switching on-o of
solenoid valves. The pressure impulses by opening the valve very fast may damage
the ball bearings of the turbine rotor and cause failure of the Quantometer.
•
Filter(smallmeshsize)shouldbeinstalledupstreamofthemetertoprotectitfrom
 anycontamination(suspendedparticles>50µm)duringstart-upandoperation.
8
DN [mm] G-Type Q
min
[m
3
/h] Q
max
[m
3
/h] HF *) [imp/m
3
] NF [imp/m
3
]
25 10 2 16 140000 10
 25 16 2,5 25 140000 10
25 25 4 40 140000 10
 50 40 6,5 65 10400 10
50 65 10 100 10400 10
80 100 8 160 27000 1
 80 160 12,5 250 27000 1
80 250 20 400 27000 1
 100 160 12,5 250 13500 1
100 250 20 400 13500 1
100 400 32 650 13500 1
150 400 32 650 5400 1
150 650 50 1000 5400 1
150 1000 80 1600 5400 1