Burkert Type 8741 - Manual (Page 14)

14
Technicaldata
Type 8741
6.3.1 Quality of the operating medium
For the required measurement and control precision and to meet the
safety requirements, the gas or gas mixture must meet the following
quality criteria according to standard ISO 8573-1 (Compressed Air -
Part 1: Contaminants and purity classes):
Maximum particle size:
Class 2: 1 μm
Maximum particle density Class 2: 1 mg/m³
Maximum dew point under pressure: Class 4: 3 °C
Maximum oil concentration Class 1: 0.01 mg/m³
For further information see ISO 8573-1.
Other hazardous gases are possible on demand; under normal oper-
ating conditions the devices do not release any gas.
6.4 mechanical data
Dimensions: See datasheet
Weight: See datasheet
Materials:
Base block
Aluminium or stainless steel 1.4305
Housing: Polycarbonate (PC)
Sealing material: See nameplate
Other parts of the proportional
valve in contact with the medium: 1.4310, 1.4113, 1.4305
6.5 fluid data
Calibration medium: Operating gas or air
Mass flow range
ref. to N2 (I
N
/min): 0.01... 80
Measurement accuracy ± 0.8% meas. val.
± 0.3% fsd.
(after 1 min. warm-up time)
Measurement range/control range: 1: 50*
* Larger measuring range
available on request.
Repeat accuracy: ±0.1% of
full scale deflection
Operating medium: See nameplate
(quality classes according to
DIN ISO 8573-1,
see section "6.3.1").
6.5.1 pressure loss diagram
The diagram shows an example of the compressed air loss for air
flow.
The two air pressure curves on the diagram are examples for the
design/device variants.
• ¼ inch pipe connection and
• flange connection on the bottom of the device (used for mounting
on a block).
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