Type 8701

9 | 12

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6.2. Flow characteristic

Nominal flow range of typical gases

Note:

• Q(Gas) = f x Q(N

2)

• When using the gas factors, measurement errors may occur that are outside the data sheet specification. For applications

requiring high accuracy, calibration under field conditions is recommended.

• Furthermore, the media compatibility of the sealing materials of the MFM should be checked before use with another gas.

Gas

Min. Q

Nom

Max. Q

Nom

[l

N/min]

[l

N/min]

Argon

0.01

80

Helium

0.01

500

Carbon dioxide

0.02

40

Air

0.01

80

Methane

0.01

80

Oxygen

0.01

80

Nitrogen

0.01

80

Hydrogen

0.01

500

7.

Ordering information

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7.2. Recommendation regarding product selection

Note:

The „Product Enquiry Form“ at the end of this document contains the relevant fluid specification. Using the experience of Bürkert

engineers already in the design phase provide us with a copy of the request containing the necessary data together with your inquiry

or order.

For the proper choice of the actuator orifice within the MFM, not only the required maximum flow rate Q

Nom, but also the pressure val-

ues directly before and after the MFM (p

1, p2) at this flow rate QNom should be known. In general, these pressures are not the same as

the overall inlet and outlet pressures of the whole plant, because usually there are additional flow resistors (tubing, additional shut-off

valves, nozzles etc.) present both before and after the controller.

Please use the „Product Enquiry Form“ at the end of this document to indicate the pressures directly before and after the MFM. If

these are unknown or not accessible to a measurement, estimates are to be made by taking into account the approximate pressure

drops over the flow resistors before and after the MFM, respectively, at a flow rate of Q

Nom. In addition, please quote the maximum in-

let pressure p

1 max. to be encountered. This data is needed to make sure the actuator is able to provide a close-tight function within

all the specified modes of operation.