Burkert Type 8741 - Manual (Page 9)

9
Systemdescription
Type 8741
5 sysTem DescripTion
5.1 Design of the mfm/mfc
Connector*
for electrical connection
(4-pin screw terminals)
Functional earth connection:
M3 screw**
M4 screw**
Fluid connection
Flow direction
LED to display the
device status (in
accordance with
Namur 107)
Micro
SIM card
Setting
fieldbus
* The removable connector is part of the device
** For cable shielding and earthing of the device
Fig. 1 : Design of MFM/MFC Type 8741
5.2 General description
Device Type 8741 is available in two basic versions.
• As a Mass Flow Meter (MFM) the device measures the mass flow
of the gases for which it has been calibrated.
• As a Mass Flow Controller (MFC) the device measures and con-
trols the mass flow of the gases for which it has been calibrated.
In contrast to the MFM, the MFC also contains a regulation valve.
The gas must be in a dry and clean state.
Digital communication with the device (for example for transfer of the
setpoint or measured value) is achieved via CANopen*- or büS**.
* CANopen - A fieldbus based on CAN (Controller Area
Network) that is used in automation technology for net-
working of devices.
** büS - A CANopen-based fieldbus with additional
functionalities.
5.3 operation of the mfm (mass
flow meter)
A sensor is integrated into the MFM to measure the mass flow. The
measured value is transmitted to an external device via a digital output
(fieldbus).
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