Quick Reference for End-Users Lambda Transmitter LT2 ... - lamtec

8 Service and Maintenance8 Service and MaintenanceIf you want to proceed a liquid purification you must note the following:You may only proceed a liquid purification, if you have dismounted the probe first. If you proceedthe liquid purification without dismounting the probe, this will damage the probe. Theprobe will not function properly after that.CAUTION!You must dismount the probe before liquid purification anyway. Liquid purification without dismountingthe probe will damage the probe.8.1 Checking the O2 Probe8.1.1 Checking the Air VoltageMultifunction key T 2• Switch off the facility• Pre-ventilate, until no more flue gas is present at the measurementsite (approx. 1 minute).• Turn off the pre-ventilation.• Carry out offset calibration either via• the (optional) display and operating unit via "cal” - menu-driven• the (optional) service and diagnostic software• T2 multifunction keyNOTICE!FunctionsToggle the displayed warning/faultReset the displayed warning/faultQuick start of the measuring gas pump - abort ofthe cold startTrigger an offset calibrationHandling of the KeysPress shortlyPress for longer than 3 sec.*Press for longer than 3sec.**Press key for longer than 3 sec.during measurement*** Some warnings and faults cannot be reset if the error is still present or the routine isstill running.**If at least one warning or fault is still present, the key must be pressed for longer than6 seconds.If probe voltage is outside the permissible range, the warning "Offset calibration to air invalid”is output.• Read out probe voltage at LT2either via– the display and operating unit (option)– the service and diagnostic software (option)– measure probe voltage with a multimeter; Connect a digital voltmeter in parallel to the probe at terminal 33 (-) and 34 (+). Compare the measured voltage with the displayed voltage (US).• Valid range: - 0mV … -20 mV• If the probe’s voltage is above/below this range → replace probe40