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Configuration
3. Configuration
3.1 Overview
Configuration Parameters
Set Up consists of configuring the following functions:
Atmospheric Pressure
Compensation:
The solubility of oxygen in water and
DL5000 dissolved oxygen probe signal
directly respond to barometric pressure
and hence pressure compensation is
not required during use. For best
accuracy, the DL424/425 modules
need to know barometric pressure at
the time of probe calibration. If
barometric pressure is known, this
value can be readily entered into the
instrument at this time. This value will
be automatically accessed during air
calibration.
A major contributor to atmospheric
pressure is altitude above or below sea
level. In the absence of a specific
knowledge of barometric pressure
value, use the nominal barometric
pressure value from
The factory default barometric pressure
value is 760 millimeters of mercury
(mmHg). Any value can be entered in
one step increments from 500 to 800
mm Hg.
Table 3-1 Dependence of Barometric
Pressure on Altitude
Alt, ft
P, mmHg
Alt, ft
P, mmHg
Sea Level
760
3000
681
200
755
3200
676
400
749
3400
671
600
744
3600
666
800
738
3800
661
1000
733
4000
656
1200
728
4200
652
1400
722
4400
647
1600
717
4600
642
1800
712
4800
637
2000
707
5000
632
2200
701
5200
628
2400
696
5400
623
2600
691
5600
618
2800
686
5800
614
Salinity:
The solubility of oxygen in salt or brackish waters, containing much
more than 1 part per thousand (ppt) total dissolved solids, is dependent on salt
concentration. The DL424 instrument accepts the total dissolved salt
concentration in ppt and performs necessary calculations to obtain the correct
dissolved oxygen concentration over salt concentration and sample temperature.
The DL 424 factory default value is 0 ppt but valid readings can range from 0 - 40
ppt and can be entered by the user in 0.1ppt increments.
The DL425 is intended for high purity water applications; salinity compensation is
not employed here.
9/11 DirectLine®
DL424/425 Sensor Module User Manual
13
Содержание DirectLine DL424
Страница 15: ...Installation Figure 2 4 Remote Mounting 9 11 DirectLine DL424 425 Sensor Module User Manual 9 ...
Страница 34: ...Spare Parts 28 DirectLine DL424 425 Sensor Module User Manual 9 11 ...
Страница 37: ...Appendix CE Mark Applications 9 11 DirectLine DL424 425 Sensor Module User Manual 31 ...