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9.9
Installation of the instrument
This HERMetic equipment must be coupled to
a certified HERMetic valve.
Before starting please read carefully the
chapter "Recommendation for safe use" and
follow your company's safety instructions.
Check that the HERMetic valve is closed.
Remove the end cap (weather cap / blind
cover / security cover) of the HERMetic valve.
Clean the seal surfaces of the nipple of the
valve and of the coupler of the instrument from
dust or grease.
Note:
Cleaning of the mating surfaces is very
important for earth grounding purpose
and
for
good
reference level.
Check whether the tape protection tube is
moving freely.
Install the HERMetic instrument on top of the
valve by means of the quick coupler special
adaptor. Ensure that the equipment is properly
earthed. If not, ground it with the (optional)
grounding cable before operating.
Attach the grounding clip to a metallic and
conductive surface. Make sure that there is
a good electrical contact.
The
HERMetic
grounded until complete withdrawal of the
probe from the tank and closure of the
valve.
9.10 Purging the equipment
This HERMetic equipment can be fitted with a
plug to purge it. This is an option, please contact
Tanksystem.
9.11 Ullage/interface measurement
Install the HERMetic equipment as per 9.9
"Installation of the instrument".
50461/GTEX MMC/1111
accuracy
on
zero
instrument
shall
Open the valve by turning the handle.
Switch on the equipment: a control beep is
audible every 2 seconds.
Put the tape cleaner on the "DOWN" position.
Disengage the knob of the crank handle and
lower the sensing probe into the tank by
turning the reel. Make sure that the tape does
not rub on any sharp edge when lowering as
its insulation could be damaged.
As soon as the sensor comes in contact with
the petroleum product the control beep will
change for a continuous beep. Raise the
sensing probe again until the continuous beep
stops and lower the sensing probe again
slowly until the continuous beep is heard
again. Now the ullage level can be read
against the ullage reference. If the zero-ullage
reference does not correspond to the reading
index of the instrument, a correction has to be
made accordingly.
Lower the sensing probe further until the
sensor touches the oil-water interface. As soon
as the sensor comes in contact with water the
continuous beep will change for an intermittent
beep. The difference between the ullage
reading and the interface reading represents
the thickness of the product layer.
When the measurements are completed,
switch off the unit, turn the tape cleaner on
"UP" position and wind up the tape until the
sensing probe is in the storage tube. The
reading on the tape shall be less than 420 mm
or 1 ft 5 inch.
be
Close the valve and disconnect the instrument
from the nipple.
Put the end cap back on the valve.
IMPORTANT NOTE
When activating the crank handle, always control
through the window that the tape is really moving.
If the tape does not move when the handle is
activated, stop winding and identify its cause.
Make sure the tape cleaner is in "DOWN"
position. If the tape is still not moving despite
correct position of the tape cleaner, please check
if the sensor is stuck somewhere.
32
UTImeter Gtex MMC
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