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7835
Hydrazine Monitor
8. Block the chamber sample inlet and establish flow through
the new disc by applying suction from a plastic syringe to
the reagent dosing chamber outlet – see Fig. 4.6, page
11.
9. Connect the sample inlet tube to the chamber (side).
10. Allow approximately 1 hour for caustic dosage to be
established (the pH of the effluent at the sensor outlet
must be at least 10.5).
11. Calibrate as described in Section 7, page 19.
9.2.3 Yearly
Sensor unit retubing (Fig. 9.1)
Replace all the tubing in the sensor unit using the internal
retubing kit – see Section 10, page 27. At the same time, empty
both the standard solution and reagent containers and replace
the 3 O-rings on each; 2 on the valve and 1 on the filler cap.
Remove and replace all tubes as detailed in the following
procedure.
Warning. This unit contains caustic and other solutions
which must be handled with care. Wear gloves and eye
protection.
0212 156
Cut in Half
7835 229
0212 154
7835 230
0211 068
and
0211 120
Fig. 9.1 Location of Flexible Tubing Items and 'O'-Rings in Sensor Unit
22
Caution. Retubing must be performed using only the
above kit. Modifications to the tubing could affect critical
flow paths within the monitor.
Clean up any chemical spillages immediately when performing
this procedure.
1. Close the sample isolator valve and allow the sensor unit
liquid handling system to drain.
2. Place absorbent tissue at the bottom of the case to soak
up any spillages.
3. Close the outlet valve on the reagent container.
4. Note the arrangement in the support bracket, remove the
sensor overflow drain tube and constant head unit feed
tube and two drain tubes.
5. Cut 0212 156 (460 mm [18.11 in]) in half and fit to
constant head unit drain stubs. Feed tubing down through
support bracket.
6. Fit 7835 229 (first of 2) to constant head unit outlet and
solenoid valve.
7. Fit 0212 154 to sensor overflow drain stub and feed
through support bracket.
0211 068
1 Each
7835 229
9 Maintenance
0211 002
1 Each
0211 044
1 Each
0212 237
7835 228
IM/7835–EN Rev. P
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