Operation; Important Information For Everyday Operation; Inspection Work In Everyday Operation; Cleaning The Electrode/Sensor - Mettler Toledo InTrac 785 Instructions D'utilisation

InTrac ® 785
5

Operation

InTrac ® 785
52 403 859
5.1

Important information for everyday operation

Caution! No attempt may be made to move the immersion tube into the «Measuring» position
without an electrode/sensor installed, otherwise sample medium can flow out via the open
immersion tube.
During operation:
– never remove fastening components (screw/bolts of flange, ring nut, etc.).
– Never remove the sensor with the housing in measuring position.
– Never remove the sensor unless the ball valve is closed.
– Never close the ball valve with the housing in measuring position.
If any malfunctions occur during operation, the equipment in which the housing is installed
must first be made safe before any corrective measures are taken.
For all work on the equipment during everyday operation, wear the stipulated protective clothing
(protective goggles, gloves, breathing apparatus, etc).
5.2

Inspection work in everyday operation

The following inspection work should be performed in everyday operation:
• Check fastenings (ring nut, flange, NPT-thread) of the housing at the vessel for firm seating
and leaks.
• Check the condition of the electrode/sensor. A faulty or damaged electrode/sensor must be
replaced immediately.
5.3

Cleaning the electrode/sensor

The electrode/sensor must be cleaned before removal, before calibration of the measurement
system or at regular intervals during operation (depending on the process medium). Proceed
as follows:
1. Move the housing into the «Maintenance» position.
2. Close the ball valve manually.
3. Optionally open flushing water supply and flush the electrode/sensor or remove the sensor
from the fitting and flush it externally.
4. Optionally close flushing water supply again or replace the sensor that has been flushed
externally.
© 07 / 12 Mettler-Toledo AG, CH-8606 Greifensee
29
Printed in Switzerland