Technical Data; Electrical Connection; Fluidic Installation - bürkert 8712 Handbuch

TECHNICAL DATA

Technical and electrical data
Operating conditions types 8712 and 8702
Ambient temperature -10 to +50 °C
Medium temperature -10 to +70 °C
Type of protection IP 65*
Installation position see calibration record
* with the specifi ed plug connectors
Electrical data types 8712 and 8702
Ambient temperature 24 V DC ±10 %
residual ripple < 5 %
Relay outputs 2 potential-free changeover
60 V, 1 A, 60 VA
Measurement precision* ±0.8 % of rate ±0.3 % F.S.
(after 1 min. warm-up)
* The specifi ed precision will be obtained only when,
after switching on, the thermal equilibration process have been
completed and the device has reached its operating temperature.
INSTALLATION AND OPERATION
General notes on installation and operation
Before installation:
Install a suitable fi lter upstream to assure cleanliness of the
operating medium.
Observe the installation position (see calibration data).
Provide a power supply with adequate power.
Observe the max. residual ripple on the operating voltage.
Remove dirt from the piping before installation of the MFC.
Proceeded in the following sequence on commissioning am
MFC / MFM:
1. Mechanical and fl uidic installation
2. Electrical installation
3. Pressurize with operating medium
4. Regular working operation

Fluidic installation

Select the available fl uidic connections to match the maximum fl ow
rate. Intake sections are not required. If necessary, we can also
supply special sizes, whereby the dimensioning of the fl uidic system
with regard to fl ow and pressure drop must be taken into account.
Screw joints
The device can on request also be supplied with screw-in joints
alredy assembled. Please select the corresponding srew joints from
the table in the annex to the Operating Instructions.
INSTALLATION AND OPERATION

Electrical connection

To assure electromagnetic compatibility (EMC),
connect the housing via as short a cable as possible
(with as large a cross-section as possible) to the
functional earth (FE).
The GND or mass conductors for all signals of the
MFC / MFM must in all cases be led individually to
the MFC. If all GND signals are bridged directly at
the MFC and only one common conductor is led
to the switching cabinet, signal displacements and
disturbances (pulses, oscillations, etc.) to the analog
signals may result.
The MFCs / MFMs are operated with 24 V power supply. Select
the connectors cross-section according to the valve used and
as large as possible (see Technical data). Suitable connecting
cables are to be found in the table in the annex to the Operating
Instructions.
→ Connect the functional earth (FE) to the marked screw, e.g.
using round pliers.