Maintenance; Cleaning The Sensor Head; Calibration; Checking With An Inspection Unit - Mettler Toledo InPro 86 0i-Serie Bedienungsanleitung

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InPro 86X0 i
30 421 372 C
4.4

Maintenance

4.4.1 Cleaning the sensor head

The ratio measurement principle provides a large degree of compensation when the sensor head
becomes contaminated with dirt/particles.
Depending on the operating conditions and media, the contamination can become so severe that
the compensation provided by the ratio measurement principle is no longer adequate and the
sensor head must be cleaned.
Window Fouling is a measurement of soiling of the measurement windows. This value is mean-
ingful in clean water-related applications. A Window Fouling surveillance feature is implemented
in the sensor to provide real-time information on sensor window contamination. A fouling alarm
can be set in the range of 0...100% in the M800 Process 1-Channel transmitter relay, and to
provide advance information for maintenance planning.
1. Place the system or equipment in a safe state (depressurized, empty, rinsed, vented or venti-
lated, etc.)
2. Disconnect electrical power
3. Dismount the sensor from the process
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 86X0 i 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 manually. The
LED light source in the InPro 86X0 i is very stable and there is no change in intensity over time.
The ratio measuring principle compensates for sample color change, or window fouling. Hence,
it is not necessary to re-calibrate the InPro 86X0 i turbidity sensor. When re-calibration with for-
mazin is required, the InPro 86X0 i 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 86X0 i turbidity
sensor. Please refer to the METTLER TOLEDO M800 1-channel transmitter instruction manual,
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 process adapter check and change of O-rings

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.
© 12 / 2018 Mettler-Toledo GmbH, CH-8902 Urdorf
InPro 86X0 i