Vaisala HMT370EX - Page 70

5. Tighten the nut a further 30° (1/12) turn, or if you have a torque wrench tighten it with a
torque of 80 ± 10 Nm (60 ± 7 ft-lbs).
30º
1
1 Draw a line on the clasp nut and the fitting screw to mark the 30° (1/12) turn
tightening rotation.
When re-tightening the nut after detachment the nut must be tightened
without increased eort.
6. Clean and grease the tightening cone of the fitting screw after every tenth detachment.
Change the sealing washer every time the fitting screw is detached. Use high-vacuum
grease (for example Dow Corning) or similar grease.
In pressurized processes it is essential to tighten the probe very
carefully when installing to prevent the loosening of the probe by the action of
pressure.
CAUTION!
When HMP374 is installed in a process with a pressure diering
from normal atmospheric pressure, you must enter the pressure value of the
process as an environmental compensation in order to receive accurate
measurement results. For information on entering environmental compensations
with the transmitter display interface or Vaisala Insight PC software, see
Environmental compensation and measurement settings overview (page 114).
CAUTION!
Take care not to overtighten the clasp nut to avoid diculties when opening it.
HMT370EX User Guide M212305EN-B
68