09-2018
file: ISAFE3-OperationManual_EN_DE.R4.VEXH.docx
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Vallen ISAFE3 Operation Manual - Operation Manual
No spring is used with the welded holder, so motion or sloshing forces cannot influence the seat
of the sensor. The cable leaving the sensor shall be fastened by an additional welded screw to
avoid forces from cable to sensor from movements or sloshing.
Since all metallic parts are in direct contact to the test object, no extra earth wire is needed.
The distance of the mounting plate to the test object is nominal 10.0 mm with all ISAS3 variants,
due to different distance pieces for the sensor. These are 12.5 mm long with ISAS3-030 and
5 mm with all other variants.
Two threads "C" in Figure 8-3 are symmetric to ISAS3 and foreseen to fasten the mounting
plate by a steel tape around the circumference of a cylindrical tank (e.g. tank car monitoring).
8.3
ISAS3-SpecIP68
– oil resistant sealing of a cable-to-sensor
transition against 12 bar peak pressure
8.3.1
Sealing Set Hardware: SS-OIL-5MM
This sealing set is needed to seal the transition of a 5 mm thick cable to ISAS3. It consists of:
1. 1 piece of heat shrink hose, oil resistant, Raychem RW-200-E-3/8-0, 9.5 mm inner
diameter before shrinking, 50 mm length, -55 °C to +200 °C
2. 1 piece of heat shrink hose, oil resistant, Raychem RW-200-E-1/2-0, 12.7 mm inner
diameter before shrinking, 60 mm length, -55 °C to +200 °C
3. 1 cable clamp for 7.4 to 10 mm diameter, oil resistant, 11 mm width
4. 1 cable clamp for 9.6 to 14 mm diameter, oil resistant, 11 mm width
The cable clamps are made of steels 1.4310, 1.4567 and 1.4305.
8.3.2
Usage of Sealing Set SS-OIL-5MM
For a temporary installation, cables
don’t have to be installed in protective tubes, so for use for
instance in a crude oil tank, oil proof coaxial cable must be used and inserted into the tank
usually through a partly open man hole. Safety consideration must be provided by a safety
expert on site. This chapter specifies only the recommended sealing of the cable-to-sensor
transition against oil and 12 bar peak pressure. If sealing is needed for water, a less expensive
heat shrink material than specified below may be used.
Figure 8-4
Figure 8-4 shows a 50 mm long
section of a heat shrink of type
RW200-E with 9.5 mm inner diameter
before shrinking)
This type of heat shrink model can be
shrinked at 150 °C to half of the
diameter before shrinking. Thickness
will be 0.9 mm after shrinking.
This part is used to make the cable
thick enough for sealing by a thicker
heat shrink.
