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Configuration and Use Manual 199
Measurement Performance
Diagnostics and Troubleshooting Specifications – Model 3350/3700Specifications – Model 3300/3500Measurement Performance
21.5.2 Density calibration procedures
To perform the low-density calibration:
1. Fill the sensor with a low-density fluid, such as air.
2. If possible, shut off the flow. Otherwise, pump the fluid through the sensor at the lowest flow
rate allowed by the process.
3. Use any established method to derive an accurate density, in g/cm
3
, for the fluid at line
conditions. If air is the low-density calibration fluid, a value from Table 21-4 can be used for
the density.
4. Press the Security button on the display.
5. From the Maintenance menu, select
Calibration.
6. Select
Density.
7. Select
Low Density.
a. Set the
D1 value to the line-condition density in grams per cubic centimeter.
b. Select
Calibrate Density, then press SEL. A “Calibration In Progress” alarm is generated.
8. When the calibration is complete:
• In the active alarm log, the alarm changes from “active” to “inactive but unacknowledged.”
• If the calibration succeeded, a “Success” status is displayed.
• If the calibration failed, a “Failed” status is displayed.
9. Press
EXIT to return to the Density menu.
10. (Optional) To clear the alarm from the active alarm log and the alarm bar at the top of the
display, acknowledge the alarm using the procedures described in Chapter 22.
To perform the high-density calibration:
1. Fill the sensor with a high-density fluid, such as water.
Table 21-5 Density of water
Temperature Temperature
°C °F Density in g/cm
3
°C °F Density in g/cm
3
0
1
2
3
4
5
6
7
8
9
10
32
33.8
35.6
37.4
39.2
41
42.8
44.6
46.4
48.2
50
0.99987
0.99993
0.99997
0.99999
1.00000
0.99999
0.99997
0.99993
0.99988
0.99981
0.99973
21
22
23
24
25
26
27
28
29
30
69.8
71.6
73.4
75.2
77
78.8
80.6
82.4
84.2
86
0.99802
0.99780
0.99756
0.99732
0.99707
0.99681
0.99654
0.99626
0.99597
0.99567
11
12
13
14
15
16
17
18
19
20
51.8
53.6
55.4
57.2
59
60.8
62.6
64.4
66.2
68
0.99963
0.99952
0.99940
0.99927
0.99913
0.99897
0.99880
0.99862
0.99843
0.99823
31
32
33
34
35
36
37
38
87.8
89.6
91.4
93.2
95
96.8
98.6
100.4
0.99537
0.99505
0.99473
0.99440
0.99406
0.99371
0.99336
0.99229