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8.6. 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. Ensure
that the equipment is properly earthed. If not,
ground it with the (optional) grounding cable
before operating.
8.7. Purging the equipment
This HERMetic equipment can be fitted with a plug
to purge it. This is an option, please contact Enraf
Tanksystem SA.
8.8. Ullage / interface measurement
− Install the HERMetic equipment as per 9.10
"Installation of the instrument".
− 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.
50489/GTEX Chem IIC/1805
accuracy
on
zero
− 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.
− Close the valve and disconnect the instrument
from the nipple.
− Put the end cap back on the valve.
IMPORTANT NOTES
Do not use any tool to activate the crank handle.
In case of abnormal effort required, identify its
cause and solve the problem. See section 11.8
Do not activate the crank handle too fast,
specifically during the rewinding operation. This
may generate a rocking of the sensor and some
damage (sensor / tape) in case of chocs onto the
tank structure.
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.
35
UTImeter Gtex Chem IIC
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