Maintenance; Cleaning The Sensor Head; Calibration; Checking With An Inspection Unit - Mettler Toledo InPro 8600i Serie Mode D'emploi

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© 07 / 16 Mettler-Toledo GmbH, CH-8902 Urdorf
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4.4

Maintenance

4.4.1 Cleaning the sensor head

The measurement principle provides a large degree of compensation for contamination of the
sensor head. However, the contamination can become so severe, depending on the operating
conditions and media, that the compensation is no longer adequate and the sensor head must
be cleaned.
1. Place the system or equipment in a safe state (depressurised, empty, rinsed, vented or venti-
lated, etc.)
2. Disconnect electrical power
3. Dismount the sensor
4. Clean the sensor head using a soft, lint-free cloth and a mild cleaning agent
5. Install the sensor

4.4.2 Calibration

The METTLER TOLEDO InPro 8600 i / D* turbidity sensor is factory calibrated prior to shipment.
The factory calibration is done with 12-points formazin calibration over the entire measuring
range. The factory calibration data is stored in the sensor and does not have to be entered man-
ually. The LED light source in the InPro 8600 i is very stable and there is no change in intensity
over time. The ratio measuring principle compensates for sample color change, or window foul-
ing. Hence, it is not necessary to re-calibrate the InPro 8600 i / D* turbidity sensor. When re-cali-
bration with formazin is required, the InPro 8600 i / D* turbidity sensor should be returned to the
factory. Please consult your local METTLER TOLEDO supplier for assistance.
In-situ one point process calibration (slope and offset) are possible for the InPro 8600 i / D* tur-
bidity sensor. Please refer to the METTLER TOLEDO M800 1-channel transmitter instruction man-
ual, section "Turbidity Calibration" for details.

4.4.3 Checking with an inspection unit

The sensor can be checked using an inspection unit with a built-in solid reference (turbi glass)
every month or when necessary. The procedure is described in the corresponding instruction
manual.
4.4.4 Tuchenhagen-Varivent
The O-ring of the process adapter needs to be checked monthly and during every service call.
METTLER TOLEDO recommends that medium-wetted seals should under all circumstances be
replaced every 6 months.

4.4.5 Measurement window check

The sapphire windows need to be checked monthly and during every service call. Take special
attention to damage, contamination and sealing.

4.4.6 Humidity check

The sensor actively monitors the humidity level in its electronics compartment. The humidity level
can be read out at the M800 transmitter. If the humidity level in the sensor increases, the sensor
will issue an alarm. Under these circumstances the sensor's readings might be unreliable.
Removing moisture from the sensor's electronics compartment necessitates servicing. Please
contact METTLER TOLEDO for assistance.
®
process adapter check and change of O-rings
InPro 8600 i Series
InPro 8600 i Series
30 113 529