UNISENSE SULF Series User Manual

Contents

UNISENSE SULF Series User Manual Manual pdf 23 page image

23TROUBLE SHOOTINGIf you encounter other problems and need scientific/technical assistance, please contactsales@unisense.com for online support (we will answer you within one workday)Problem A high and drifting signalPossible cause 1 Gas bubbles are present inside the sensor tip due to a short circuitor electrical shockSolution Degas water by boiling and subsequent cooling or by 10 minutesof vacuum treatment Immerse the sensor tip for 20 min in thedegassed water Repeated or prolonged treatment may benecessaryPossible cause 2 The sensor tip is brokenSolution Replace the H2S microsensorProblem A slow responsePossible cause Insoluble compounds deposited on the sensor tipSolution Rinse with 96% ethanol, rinse with 0 01 M HCl and rinse withwaterProblem Measurements in two environments with equal H2S concentrations exhibit different signalsPossible cause The light intensity differs between the two environments, causingdifferent light interferenceSolution Try to keep constant light conditions and interpret data with thelight interference in mindProblem Signal unstable fluctuatung if the set-up is touched or equipmentis introduced in the mediumPossible cause Electrical disturbance through the tip membraneSolution Ground the set-up by connecting the reference plug on thepicoammeter (blue plug) with the medium you are measuring inUse the provided blue grounding wire Leave the other end withapproximately 1 cm un-insulated wire (If you are measuring in e ga sediment, just put the open wire end in the water column)

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