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7835
Hydrazine Monitor
5.3.1 Standard Solution Flowrate
Set this flowrate first:
1. Close the sensor unit sample isolator valve.
2. Fill the standard solution container with standard solution
or high purity water. Open the outlet valve at the container.
3. Start a calibration to energize the solenoid valve and to
allow the flow of standard solution; this starts a 15 minute
calibration sequence at the transmitter. Use a 50 ml
(1.7 fl. oz.) syringe to draw solution from the sensor drain
tube until any air bubbles are removed. Top-up the
container as necessary.
4. Wait ten minutes to allow the temperature to stabilize.
Caution. Do NOT rotate the sensor with the top of
the unit.
5. Rotate the sensor, using the main body of the sensor, to
allow access for a 50 ml (1.7 fl. oz.) measuring cylinder
under the drain tube outlet.
6. Allow the liquid to drip freely into the 50 ml (1.7 fl. oz.)
measuring cylinder. It must not run down the side of the
cylinder. If the flow rate is not within 0.2 ml min
value in Table 5.1, adjust by loosening the 2 liquid handling
panel securing screws and move the panel up or down
(using the thumb wheel) to decrease or increase the flow
respectively. Left to right adjustment increases flow.
Tighten the screws when the correct flow rate has been
achieved.
Note. If the flow rate check is not achieved within the
calibration time, restart a calibration. A failed
calibration may be displayed but can be ignored at
this early setting up stage.
7. Allow all the high purity water to drain from the standard
solution container.
14
5.3.2 Sample Flowrate
Warning. The sample is dosed with sodium hydroxide and
the concentration, although low at first, increases if any
spillage is left to evaporate. Take care to dispose of the
outflow safely.
1. Open the sample isolator valve to the sensor unit. Normal
operation flow paths are shown in Fig. 5.1, page 15 and,
for the calibration sequence in Fig. 5.2, page 15.
2. The flow rate of sample (from the constant head unit)
through the sensor can now be checked. Ensure that
sample is flowing through the sensor, i.e. CAL is not
displayed and the solenoid valve is de-energized. Read
the temperature of the sample and refer to Table 5.1. Wait
ten minutes for the temperature to stabilize. Measure the
flow rate with a measuring cylinder as described in
Section 5.3.1. If the flow rate is not within 0.2 ml min
the value given in the table, adjust by rotating the overflow
tube in the constant head unit. Anti-clockwise adjustment
increases flow.
3. Relocate the drain tubes in the drain tundish.
-1
of the
Sample
Temp. ° C
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
Table 5.1 Relationship of Sample Temperature to Flow
5 Commissioning
Sample
Sample
Flow
Temp. ° C
(ml/min)
14.0
32
14.3
33
14.7
34
15.0
35
15.4
36
15.7
37
16.0
38
16.3
39
16.6
40
16.9
41
17.2
42
17.5
43
17.8
44
18.1
45
18.4
46
18.7
47
19.0
48
19.2
49
19.5
50
19.7
51
20.0
52
20.3
53
20.5
54
20.8
55
21.0
54
21.2
55
21.5
IM/7835–EN Rev. P
-1
of
Sample
Flow
(ml/min)
21.7
21.9
22.1
22.3
22.5
22.7
22.9
23.1
23.3
23.5
23.7
23.9
24.1
24.3
24.4
24.6
24.8
24.9
25.1
25.2
25.4
25.5
25.7
25.8
25.7
25.8
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