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9.13 Temperature measurement
• Install the HERMetic equipment as per 9.9 “Installation of the
instrument”.
• Open the valve by turning the handle.
• Switch on the unit: 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 to
the
deepest reading desired. Make sure that the tape does
not rub on any sharp edge when lowering; its insulation might
be damaged.
• The position of temperature sensor coincides with zero of
tape, so the tape index reading shows directly level at which
temperature is measured
• When the desired temperature ullage level is reached, joggle
the sensing probe approximately 300 mm (1 foot) above
and below the desired measurement level until the displayed
temperature reading settles. For heavy crude oils which have
a low thermal conductivity and a viscous nature, the joggling
procedure is a necessity to assure an accurate temperature
reading in a minimum amount of time.
• When temperature has settled, record it.
• Engage the tape cleaner on “UP” position. Raise the probe to
the next ullage level to be measured and repeat the procedure
a.m. To joggle the sensing probe the tape cleaner must be on
the “DOWN” position.
• When the measurements are completed, switch off the
unit, engage 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 NOTE
As mentionned in 9.6 “Muting the buzzer” it is easy to mute the
buzzer during the temperature measurement by pressing on “-”.
Recall that after 5 minutes have elapsed or each time the probe
detects a change of the medium (air, liquid, water), the buzzer
will reactivate automatically. To keep it muting, press on “-”
again.
10. Care and Maintenance
10.1 Care
Clean the instrument of any excess of liquid after use. Remove
the housing lid and clean the tape housing. This cleaning must
be done very properly, in particular when corrosive liquids are
gauged, such as strong acids or caustic soda for instance
.
Make sure that the sensing probe is completely stored in the
storage tube after use (reading index shall indicate less than
420 mm or 1 ft 5”).
Check the tightness of the reading index screws and if
necessary adjust the level, refer to section 7.5 “Reading index”.
Store the instrument in a dry location.
Check periodically (at least every 6 months) the continuity of
grounding by measuring the electrical resistance between the
tape adaptor (or the sensing probe tube) and the quick connect
coupler. Resistance should not exceed 10
Ω.
Periodically clean carefully the sensor probe, the tape housing
and the mechanical parts, as storage tube, tape, with an
appropriate solvent.
Note: always reassemble the storage tube to the housing in
the vertical position to allow the O-ring to seat properly in
the tube.
Check periodically the condition of the tape cleaner.
With such conductive liquids which form salts when drying,
wash the sensing probe with water or alcohol and brush it very
gently with a soft brush to prevent a water detection error due
to a short-circuit between the electrode and the tube.
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