
Transmitter M400 81
© 02 / 2010 Mettler-Toledo AG, CH-8606 Greifensee, Switzerland Transmitter M400
Printed in Switzerland 52 121 378
The sensor keeps the information stored in the built in electronics and can be retrieved via a
transmitter or the iSense asset management suite.
The alarm will be reset if the Lifetime Indicator is not 0 days anymore (e.g. after connecting a
new sensor or changing on the measurement conditions).
For amperometric oxygen sensors, the lifetime indicator is related to the inner-body of the sen-
sor. After exchanging the inner-body, reset the lifetime indicator as described in chapter 8.6.5
“Reset ISM counter/timer”.
For optical DO sensors the lifetime indicator is related to the OptoCap. After exchanging the Op-
toCap, reset the lifetime indicator as described in chapter 8.6.5 “Reset ISM counter / timer”
If the Lifetime Indicator is turned on, in the measuring mode the value will be automatically
shown in the display on line 3.
Press [ENTER]
Time to Maintenance (not for optical sensors): This timer estimates when the next cleaning cy-
cle should be performed to keep the best possible measurement performance. The timer is influ-
enced by significant changes on the DLI parameters.
Time to Maintenance YES / NO
Alarm YES / NO R# choose relay
The time to maintenance can be reset to the initial value by the menu ”Reset ISM Counter Timer”
(see chapter 8.6.5 “Reset ISM counter/timer”). For amperometric oxygen sensors, the time to
maintenance indicates a maintenance cycle for the membrane and electrolyte.
Press [ENTER]
Activation of the Adaptive Cal Timer: This timer estimates when the next calibration should be
performed to keep the best possible measurement performance. The timer is influenced by sig-
nificant changes on the DLI parameters.
Adaptive Cal Timer YES / NO
Alarm YES / NO R# choose relay
The Adaptive Calibration Timer will be reset to his initial value after a successful calibration. After
a successful calibration will also be the alarm reset. If the Adaptive Cal Timer is turned on, the
value will be automatically shown in the display on line 4.
Press [ENTER]
The initial value for Time to Maintenance as well as the Adaptive Calibration Timer can be modi-
fied according to the application experience and loaded down to the sensor.
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NOTE: By connecting a sensor, the values for Time to Maintenance and/or Adaptive Calibration
Timer are read out by the sensor.
Pressing the [ENTER] key again will bring up the Save Changes dialog. Selecting No will dis-
card the entered values and return to the measurement display screen, selecting Yes will save
changes made.
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