Shut-Down Procedure - ABB Navigator 550 Operating Instructions Manual

Navigator 500
Hydrazine analyzer

8.3 Shut-down procedure

If the wet-section needs to be shut down for longer than 1
week, perform the following procedure:
1. Turn sample flow off and allow the constant-head unit to
drain.
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 from
the sockets.
Warning. The gel in the hydrazine sensor contains
silver oxide and sodium hydroxide. It is caustic and
stains skin and clothing. Wear gloves and eye
protection.
3. Remove the hydrazine sensor and drain it as detailed in
Section 8.4.1, page 58.
4. Replace the (drained) hydrazine sensor in its mounting
clip.
Warning. The reagent is extremely caustic and must
be handled with great care. Wear gloves and eye
protection.
5. Disconnect the QD coupling on the reagent container (see
Fig. 8.3, page 56) and remove the reagent container.
Either empty the contents into a storage container or
discard, rinse out the container and replace in the
wet-section.
6. Clean the porous disc by attaching a piece of tubing to the
reagent dosing chamber outlet and place the other end in
a beaker of high purity water. Clamp the reagent dosing
chamber sample inlet tube – refer to Section 8.2.4, page
E
54, item .
7. Attach a large syringe (for example 50 ml) to the reagent
inlet and draw the water through the disc. Repeat this
several times. This procedure effectively back-flushes the
dosing chamber assembly.
8. Flush the delay / mixing coil with demineralized water.
9. Remove the clamp on the reagent dosing chamber
sample inlet tube, reassemble the panel, clean up any
spillage and then close the wet-section door.
OI/AHM550–EN Rev. A 57