UNISENSE SULF Series User Manual

Contents

UNISENSE SULF Series User Manual Manual pdf 11 page image

11• Once the correct polarization (see above) isentered, press SelectThe sensor is now polarizedSetting polarization on the PA2000If you are using the legacy PA2000 please consult the PA2000manual, which is available on www unisense com/manualsIf you are using another amplifier or sensor connection type,please check the polarization voltage before connecting a sensor,since incorrect polarization may destroy the sensorFor details on how to set the polarization, consult the user manualof the amplifier that you are usingpre-polarizationA period of polarization is necessary before you can use the sensorThis is called the pre-polarization period If the sensor is new or hasnot been operated for several days, it must be pre-polarized for atleast 2 hours before it can be calibrated and used After shorterperiods without polarization, the sensor should be pre-polarizeduntil it has shown a stable signal for at least ten minutes Whenpre-polarization is initiated, the signal will be very high andthen drop rapidly over the first few minutes After that, thesignal will drop slowly for up to two hours (for needle- and somecustom-made sensors slightly longer) It takes normally between10 minutes and an hour before a sensor is stable The sensor signaldepends on the specific sensor (see the delivery note which camewith the sensor) If the signal does not stabilize or is too high ortoo low, refer to the ‘Troubleshooting’ sectionIMPORTANTCalibration mustbe performed afterpre-polarizationwhen the sensorsignal hasstabilized.Always usea calibrationsolution with thesame temperatureand salinity as thesample solution.

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