
Transmitter M400 80
© 02 / 2010 Mettler-Toledo AG, CH-8606 Greifensee, Switzerland Transmitter M400
Printed in Switzerland 52 121 378
8.5.2 Clean
Configure the relay to be used for the cleaning cycle.
The default value is relay 1.
The cleaning interval can be set from 0.000 to 999.9 hours. Setting it to 0 turns the clean
cycle off. The cleaning time can be 0 to 9999 seconds and must be smaller than the cleaning
interval.
Select the desired Relay state: Normal or Inverted.
Pressing the [ENTER] key again will bring up the Save Changes dialog. Selecting No will
discard the entered values and return to the measurement display screen, selecting Yes will
save changes made.
8.6 ISM set up
(available for pH and oxygen ISM sensors)
(PATH: Menu / Configure / ISM Setup)
Enter Configuration mode as described in Section 8.1. “Enter Configuration Mode” and navigate
to the menu “ISM set up” by using the or . key. Press [ENTER]
8.6.1 Sensor monitoring
Select the menu “Sensor Monitoring” by pressing [ENTER].
The sensor monitoring options can be turned on or off and every alarm can be assigned to a
certain output relays. The following options are possible:
Lifetime indicator: The dynamic lifetime indication allows an estimation, when the pH electrode
or the inner body of an amperometric oxygen sensors or the OptoCap of an optical oxygen sen-
sor is at the end of his lifetime, based on the actual stress he is exposed to. The sensor perma-
nently takes the averaged stress of the past days into consideration and is able to increase / de-
crease the lifetime accordingly.
Lifetime Indicator YES / NO
Alarm YES / NO R# choose relay
The following parameters affect the lifetime indicator:
Dynamic parameters: Static parameters:
– Temperature – Calibration history
– pH or oxygen value – Zero and Slope
– Glass impedance (only pH) – Phase 0 and phase 100 (only optical DO)
– Reference impedance (only pH) – Illumination time (only optical DO)
– CIP / SIP / Autoclaving cycles
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