Fitting Via A Flange; Fitting Via Npt External Thread; Direct Installation In An Existing Ball Valve; Attaching The Flushing Lines (Optional Flushing Chamber) - Mettler Toledo InTrac 785 Instructions D'utilisation

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© 07 / 12 Mettler-Toledo AG, CH-8606 Greifensee
Printed in Switzerland

4.2.1.1 Fitting via a flange

1. Clean the sealing surfaces of the flange (housing and flange connection on vessel) and
check for damage.
Caution! If the process media/reaction products are considered to be dangerous, it is impe-
rative that an embedded seal is used at the flange interface and/or a splash guard mounted.
Fitting of the retractable housing with damaged flange connections is not allowed and can
present a hazard to persons and/or lead to material damage.
2. Use the appropriate flange gasket and check for sound condition. Replace if necessary.
Attention in the case of housings made of special materials: Check that the seal is present
on the flange of the retractable housing and is not damaged. Replace if necessary. Ensure
correct quality and positioning of the seal.
3. Check the vessel to ensure that there are no obstacles in the insertion direction which could
hinder the motion of the immersion tube.
4. Position the housing on the flange connection, align, and tighten evenly crosswise using the
prescribed number of bolts and nuts.

4.2.1.2 Fitting via NPT external thread

1. Wind PTFE tape around the external male thread.
2. Screw the housing carefully into the female socket.
3. Check the Installation for leaks.

4.2.1.3 Direct installation in an existing ball valve

Fitting in an existing ball valve is possible. The following type must be available:
1" F NPT.
Note: If the housing is connected via a ball valve supplied by the customer, METTLER TOLEDO
accepts no responsibility for the safety and functionality of the measuring point.

4.2.1.4 Attaching the flushing lines (optional flushing chamber)

– Danger! When retracting the immersion tube from the process, small quantities of process
medium will remain attached to the electrode/sensor and will thus enter the discharge line
during flushing procedures. If the process medium contains toxic, caustic substances
damaging to the environment, then it is imperative to consult local regulations relative to the
design and construction of effluent (treatment) installations.
– When constructing the flushing water installation, use only materials which are resistant to
corrosion and chemicals.
Recommendations for proper operation and safe use
All flushing lines must be equipped with check valves which may only be opened when the im-
mersion tube is in the retracted position («Maintenance»). After maintenance work on the sen-
sors, the valves must be closed.
InTrac ® 785
InTrac ® 785
52 403 859