11
6.3 GENERAL INSTALLATION RECOMMENDATIONS
Mount
the
ViscoSense
®
3
housing as low as possible, in the fuel system.
Compare your process variables with the specifications. Make sure these are compatible!
Pressure pulsations and variations should be avoided as much as possible.
Mechanical vibrations should be avoided as much as possible.
No special tools are required to install the
ViscoSense
®
3
. Ensure that your standard tools
are fit for the job.
Make sure that the working environment is clean. Ensure that no dirt can enter the sensor.
Insulate the pipes and the sensor housing well, to avoid any temperature loss of the fluid.
When fuel viscosity is 500 mPa.s or thicker it is recommended to wrap steam tracing with
sufficient capacity, or 20 Watts/metre resistance wiring around the
ViscoSense
®
3
housing.
VAF
ViscoSense
®
3
sensor and interface box are precision instruments. Handle them with
care
.
Do not unscrew the cable gland on the top of the
ViscoSense
®
3
sensor or disconnect the
cable from the sensor. This will violate the correct operation of the
ViscoSense
®
3
sensor.
Take care that the pendulum is not damaged and the torsion tube not bent by
mechanical force.
This will violate the
ViscoSense
®
3
signal.
6.4 MECHANICAL INSTALLATION
6.4.1
ViscoSense
®
3
interface box
1. Install the
ViscoSense
®
3
interface box in a suitable location, free from excessive vibrations,
humidity and excessive temperature variations.
2. The maximum distance between sensor and the interface box is determined by the cable length
from the sensor, being approx. 5 metres.
3.
Allow sufficient space for installation of cables and for servicing
.
4. The surface on which the interface box is mounted should at least be able to bear a weight of 10
kg.
6.4.2
ViscoSense
®
3
housing
1.
Remove dust caps from sensor housing and install housing stress-free, with shut-off valves and
bypass valve in the fuel piping as illustrated in figure 6. Take care that the flow direction is in
accordance with the indication on the housing (inlet, outlet and arrow) as illustrated in figure 8.
Support inlet and outlet piping sufficiently.
These shut-off valves and bypass valve are not furnished by VAF Instruments.
2. Note that the distance between fuel heater and sensor housing inlet should not exceed 4 metres.
3. To protect the instrument from excessive vibrations, which can cause malfunctioning of the
instrument, it is recommended to:
Install the
ViscoSense
®
3
as low as possible in the fuel system close to a solid structure or beam.
Install suitable pipe clamps at both sides of the
ViscoSense
®
3
sensor housing.
