Maintenance and CleaningNFM 600 - rev. 02 / 10.07.2019 page 125Maintenance and CleaningWARNING Disconnect instrument from mains powerDisconnect the instrument from mains power and safeguard the higher system againstrestart before you begin maintenance works.Disregarding may lead to electric shocks.WARNING Check danger due to explosive gasesMake sure to observe all regulations regarding safety at work as well as danger due toexplosive gases prior to beginning mounting, installation and maintenance works. Use agas warner.When working in channel systems make sure to avoid electrostatic charge: Avoid unnecessary movements to minimise the risk of static energy accumulating. Discharge any possible static electricity from your body before you begin to installthe sensor.Disregarding may lead to personal injury or damage your facility.WARNING Germ contamination possibleDue to being frequently used in wastewater applications, some portions of the measure-ment system may be loaded with hazardous germs. This is why precautionary measuresshall be taken while being in contact with cables and sensors.Wear protective clothing.50 Maintenance50.1 Maintenance IntervalThe Type NivuFlow Mobile transmitters are conceived to be virtually free of calibration,maintenance and wear.NIVUS, however, recommend having the entire measurement system inspected by theNIVUS customer service once per year.Depending on the area of use the maintenance intervals may vary. Extent and intervals ofmaintenance depend on the following conditions:• Measurement principle of sensors• Material wear• Measurement medium and hydraulic conditions• General regulations for the operators of the measurement facility• Ambient conditionsIn addition to the annual inspection NIVUS recommends a complete maintenance of themeasurement system by the manufacturer after ten years the latest.In general, the inspection of instruments/sensors is a basic measure which helps to increaseoperational safety as well as the lifetime.
