Installation
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5.2.1
Installation with screw-in unit
For installation of the VISY-Stick sensor, the tank coupling must have an internal thread of at
least 1½"; for the VISY-Stick Advanced sensor, it must have an internal thread of at least 2".
The procedure for installing sensors with screw-in unit (see Figure 14) is described below. For
tank pipe couplings with an internal thread larger than 1½", reducers of the appropriate size
will also be required:
(1)
Check that the circlip on the end of the probe tube is securely attached so that the float
is unable to fall into the tank.
(2)
The floats must be pushed onto the probe tube with the marking “TOP” facing the
probe head.
(3)
Use a hexagon socket key (5 mm) to loosen the locking screw and stuffing box (SW 30)
so that the screw-in unit can be moved easily on the probe tube.
(4)
Provide the screw-in unit with suitable sealing material and then screw it into the tank
coupling together with the VISY-Stick.
(5)
Press the probe tube gently onto the bottom of the tank and then lift it again to incor-
porate an appropriate safety distance. To fix the probe tube, first tighten the stuffing
box and then tighten the locking screw.
If there is no safety distance between the probe tube and the bottom of the tank,
the tube could be bent and damaged by the tightening process. For tanks with a
diameter up to 2900 mm, the safety distance must be about 10 mm. For larger
tanks, the safety distance must be more than 10 mm, and is to be selected according
to the tank size.
Write down this safety distance for the configuration of VISY-Command with
VISY-Setup.
(6)
Connect the equipotential bonding cable with the outer equipotential clamp of the probe
head.
(7)
Connect the supplied FAFNIR connection cable to the VISY-Stick. First tighten the union
nut of the M12 coupler by hand and then tighten it further through 180° using a span-
ner. The tightening torque should be between 100 … 150 Ncm.
An installation kit 1" is also available as an option. This installation kit consists of a product-
and water float and a screw-in unit. It makes the installation of VISY-Stick possible by using an
R1 threaded sleeve.
