Burkert 8746, Operating Instructions Manual

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Technical data
Type 8746 Profibus, 8746 Analogue
6.7.2 Mass flow controller with proportional
valve
Tab. 13: Fluid data, MFC with proportional valve
Calibration fluid Operating gas or air
Mass flow-rate range
(reference to N2 (I
N
/min))
20...1500 I
N
/min
Exact range depends on the product base-block size and on
the gas used. Refer to the datasheet related to the product
Type.
Measuring range/closed-loop
control range
1:50
Larger measuring range
available on request.
Repeatability ±0.1% of the full scale
Operating fluid See Type label
Measurement accuracy, after
15 minute warm-up time and
with the calibration fluid
± 1.5%
6)
of the measured value
± 0.3%
6)
of the full scale
Settling time < 500 ms
6) If the operating fluid is different from the calibration fluid, then the
measurement accuracy can be lower. If the operating gas is nitrogen
or oxygen , then the given measurement accuracy is correct. But if the
operating gas is natural gas , then the measurement accuracy may be
different because the composition of natural gas varies depending on the
season and origin.
6.7.3 Mass flow controller with motor valve
Tab. 14: Fluid data, MFC with motor valve
Calibration fluid Operating gas or air
Mass flow-rate range
(reference to N2 (I
N
/min))
20...2500 I
N
/min
Exact range depends on the product base-block size and on
the gas used. Refer to the datasheet related to the product
Type.
Measuring range/closed-loop
control range
1:50
Larger measuring range
available on request.
Repeatability ±0.1% of the full scale
Operating fluid See Type label
Measurement accuracy, after
15 minute warm-up time and
with the calibration fluid
± 2%
7)
of the measured value
± 0.5%
7)
of the full scale
Settling time < 5 s
7) If the operating fluid is different from the calibration fluid, then the
measurement accuracy can be lower. If the operating gas is nitrogen
or oxygen , then the given measurement accuracy is correct. But if the
operating gas is natural gas , then the measurement accuracy may be
different because the composition of natural gas varies depending on the
season and origin.
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