Pneumatically Operated Housings - Mettler Toledo InTrac 777-SL Instructions D'utilisation

12
3.3.2

Pneumatically operated housings

– InTrac
– InTrac
The compressed air connections are used to pressurize the
piston of the immersion tube either from above or below. This
moves the immersion tube and hence the electrode/sensor either
downwards (to the "Measuring" position) or upwards (to the
"Maintenance" position). The piston remains pressurized with
compressed air at the respective end position.
In the versions equipped with a position indication system
(InTrac
ly triggered when the housing reaches the respective ("Measur-
ing" or "Maintenance") end position. This signal is transmitted
to a remote indicator (not included in housing supply).
InTrac 777-SL-04-CH
52 400 841
®
777-SLP, InTrac
®
777-SLR, InTrac
(pneumatic versions with end position indicator)
®
777-SLR, InTrac
"Measuring" position, pneumatic versions
In the "Measuring" position compressed air
pressurizes the immersion tube piston from
above. The process medium flows past the
electrode/sensor tip through the opening in the
immersion tube. O-rings seal the housing
against the sample medium.
"Maintenance" position, pneumatic versions
In the "Maintenance" position compressed air
pressurizes the immersion tube piston from
below. In this position the electrode/sensor can
be cleaned or removed/exchanged or the mea-
surement system calibrated with the electro-
de/sensor installed. O-rings seal the housing
against the sample medium.
The housings are equipped with an automatic
sensor detection arrangement. If no electro-
de/sensor is fitted, or is improperly installed, the
housing will not move into the "Measuring"
position.
© 06/00 Mettler-Toledo GmbH, CH-8606 Greifensee
InTrac ® 777-SL / InTrac
®
776-SLP
®
776-SLR
®
776-SLR), a signal is pneumatical-
® 776-SL
Printed in Switzerland