Even when connected to fixed pipework, we recommend that the devices are
mounted using the appropriate mounting holes
From 50 ln/min, we recommend the following flow-calming sections of straight
and unobstructed straight tubing: Inlet: 10 x diameter; outlet: 5 x diameter
Use appropriate fittings (see chapter
3.13 Fittings and filters
).
Malfunctions can be caused by unstable pressure controllers, pumps that
oscillate, and volumes before and/or after the measuring device that are
generally too small. Install an air reservoir with 2 liter volume in the feed pipe (2
liter is an example, the volume depends on the application).
The size of the pipe must be matched to the measuring/control device. A
diameter that is too small results in an increased pressure drop.
Check for any leaks before commissioning the devices.
For maintenance work, we recommend that a bypass system is used. This is
particularly important where the gas supply must not be interrupted.
3.13. Fittings and filters
You can order a wide range of process fittings and adapters for the compact. Some
compression fittings are available with an internal 50μ filter. Please refer to our website
contact you local distributor for more details. Please also consider that fittings and
filters can create additional pressure drops over the flow meter.
.
Figure 6: 316SS Compression fittings
Please note that the length of the tread on you fitting that is screwed inside the body is for
the G¼˝ no longer than 10mm (⅜”) and for the G½˝ no longer than 13mm (½˝) to avoid
internal damage.
The design of the devices enables sealing at the ends with O-rings or flat seals. It is
essential that you avoid:
the use of sealing tape to seal threads. Small pieces can cause incorrect measurements
and control-valve malfunctions. As well as that, if the device has to be checked or
recalibrated, there will be an extra charge for the additional cleaning work.
sealing with liquid sealants will incur a higher cleaning charge for cleaning the device in
an ultrasonic tank.
Installation
The fittings are supplied in pairs: they preferably should be installed with filter at the
inlet and without filter at the outlet. The fitting with a filter must be installed at the
inlet (as determined by the flow direction). The sealing rings (O-rings) must not be
damaged during assembly.
For more information, see the data sheet for the fittings.
3.14. Filters / Gas cleanliness
We always recommend that a filter, or at least a fine-mesh sieve (50 microns), is
installed before the measuring devices. It often happens that solid matter such as
welding residues, metal or plastic chips, rust, sealing tape, etc. affect the function.
In pressurized-air applications using compressors, the air must be dry and free of oil.
Please ensure that a suitable processing unit is located before the devices. In the case
of gases from cylinders, in general no filter is needed. For more information, see
3.15. Electrical power supply