4 Technical Description
21
4.5.1 Multifunction push button T1
NOTE:
Function Button assignment
Change the displayed
warning/fault
Reset the displayed
warning/fault
Quick start measuring gas pump,
abort cold start
Initiate offset calibration or test gas
calibration
Press briefly
Press for more than 3s *
Press for more than 3s **
Press button for more than 3s ** in
measurement mode
* Some warnings and faults cannot be reset as long as the fault is still
present or the routine is still in progress.
** If at least one warning or fault is present, the button must be pressed
for more than 6 seconds.
4.5.2 Monitor output
The monitor output [terminal 31 (-), 32 (+)] allows a multimeter to be connected, for
example. Via the monitor output, the following measurement values can be obtained in
situ on the LT 2/KS1-DK:
• O
2
measurement value
• Probe voltage [U-O2] of O
2
sensor
• AC internal resistance [R
i
probe] of O
2
sensor
Processor board micro-switches
SW 1 SW 2 Function of monitor output
off off
O
2
measurement value 0...2.5 V ≡ 0…25 vol.% O
2
on off
Probe voltage (U-O2) of O
2
sensor 0...2.5 V ≡ 0…250 mV
off on
Cell internal resistance (Ri probe) of O
2
sensor 0...2.5 V ≡ 0…250 Ω
Input resistance of connected measuring device > 10 kΩ
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