ABB Navigator 550 Operating Instructions Manual

Also see for Navigator 550: Commissioning instructions Operating instructions Replacement Procedures Quick start guide Manual

ABB Navigator 550 Operating Instructions Manual Manual pdf 59 page image

Navigator 500Hydrazine analyzerOI/AHM550–EN Rev. A 578.3 Shut-down procedureIf the wet-section needs to be shut down for longer than 1week, perform the following procedure:1. Turn sample flow off and allow the constant-head unit todrain.2. Turn the hydrazine sensor plugs (electrical connectors),located on the side of the liquid handling panel,anti-clockwise and disconnect them by pulling them fromthe sockets.3. Remove the hydrazine sensor and drain it as detailed inSection 8.4.1, page 58.4. Replace the (drained) hydrazine sensor in its mountingclip.5. Disconnect the QD coupling on the reagent container (seeFig. 8.3, page 56) and remove the reagent container.Either empty the contents into a storage container ordiscard, rinse out the container and replace in thewet-section.6. Clean the porous disc by attaching a piece of tubing to thereagent dosing chamber outlet and place the other end ina beaker of high purity water. Clamp the reagent dosingchamber sample inlet tube – refer to Section 8.2.4, page54, item E.7. Attach a large syringe (for example 50 ml) to the reagentinlet and draw the water through the disc. Repeat thisseveral times. This procedure effectively back-flushes thedosing chamber assembly.8. Flush the delay / mixing coil with demineralized water.9. Remove the clamp on the reagent dosing chambersample inlet tube, reassemble the panel, clean up anyspillage and then close the wet-section door.Warning. The gel in the hydrazine sensor containssilver oxide and sodium hydroxide. It is caustic andstains skin and clothing. Wear gloves and eyeprotection.Warning. The reagent is extremely caustic and mustbe handled with great care. Wear gloves and eyeprotection.