Emerson CMF200A Manuel d'utilisateur télécharger pdf (Page 4)

4 Micro Motion

2-Wire Coriolis Flow and Density Meters

Gas flow performance

When selecting sensors for gas applications, measurement accuracy is a function of fluid mass flow rate independent of operating

temperature, pressure, or composition. However, pressure drop through the sensor is dependent upon operating temperature,

pressure, and fluid composition. Therefore, when selecting a sensor for any particular gas application, it is highly recommended

that each sensor be sized using the Micro Motion product selector, available at www.micromotion.com.

Mass Volume

(1)

(1) Normal (Nm

/h) reference conditions are 1,013 bar and 0 °C.

kg/h Nm

Flow rates that produce approximately 0,68 bar pressure drop on air at 20 °C and 6,8 bar

CMF025 110 90

CMF050 300 230

CMF100 1300 1000

CMF200 4000 3100

Flow rates that produce approximately 3,4 bar pressure drop on natural gas (MW 16,675) at 20 °C and 34,0 bar

CMF025 450 600

CMF050 1140 1530

CMF100 5000 6700

CMF200 15200 20500

Mass flow accuracy

(2)

(2) Flow accuracy includes the combined effects of repeatability, linearity, and hysteresis.

±0,35% of rate

(3)

(3) When flow rate is less than zero stability / 0,0035, accuracy equals ±[(zero stability / flow rate) × 100]% of rate and repeatability

equals ±[½(zero stability / flow rate) × 100]% of rate.

Mass flow repeatability ±0,20% of rate

(3)

Zero stability Refer to liquid flow specifications on page 3.

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Emerson CMF200A Manuel d'utilisateur Page 4