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Installation, Operation & Maintenance Manual
OXYvisor Optical Oxygen Analyzer
The
Measurement & Units
sub-menu is used during primary setup of the analyzer. It allows selection of the BOS
sensor type (BOS1, BOS2, BOS3 or custom), process media (gas or liquid), oxygen units, compensating units
(temp and pressure), sample rate, and signal intensity needed for accurate measurement within a specific
application.
Select
Oxygen Sensor Type
: BOS1, BOS2 or BOS3 sensor ranges. The sensor tag will show the sensor type
within the model number.
The Media selection defines the phase in which the oxygen measurement is made. Gas Phase (ppmv),
Aqueous liquid (dissolved oxygen) and Non-Aqueous liquid (dissolved oxygen) selections are available.
Gas Phase Oxygen Measurement
:
Select this when measuring % to trace (ppm) level oxygen in gas samples or gas processes.
Humidity Present (>50%)
- Default is
NO
. Only select
YES
, if special calculation for dry basis measurement
is required. The analyzer will calculate the dry O
2
basis by accounting for the expected water vapor based
on 100% H
2
0 saturation and the measured temperature. For most cases, it is useful to know the actual O
2
concentration under the wet process conditions.
Std Pressure Compensation
- This selection calculates the oxygen concentration (% mole or % volume)
from the measured oxygen partial pressure utilizing the ideal gas law. This is the proper selection for most all
OXYvisor applications, with the exception of in-situ, in-line installations, in high pressure applications that are
more than 300+ psig, 20 Bar. See Appendix A.1-1
AGI Compressibility
- For measurement in high pressure systems (>300 psig, 20 Bar) a more advanced
calculation to account for molecular interactions, non-ideal behavior is available. The calculation uses AGI
compressibility data, based on stream composition provided by end user. The AGI compressibility data can
only be inputed via a PC from the OXYvisor’s OxygenAnalyzer Software. See Appendix A.1-2.
Aqueous Liquid (Contains Water) -
D.O. Measurement:
Select this for measuring ppm (mg/L) or ppb (µg/L) dissolved oxygen in aqueous solutions. This selection will
convert the partial pressure of oxygen measurement to concentration based on the Bunsen Correlation and the
option for a dissolved salt correction. See Appendix A.2.
User Defined Constants
are for special applications and should only be used with factory
recommendation.
Sensor Type Description
GAS PHASE % O2
Liquid Phase
BOS2
High Range
0 to 25%
0 to 45 mg/L (ppm)
BOS1
Mid Range
0 to 5%
0 to 2 ppm
BOS3
Low or Trace Range 0 to 0.0300 % (300 ppm O
2
) Not used in Liquids
5.11.1 - Measurement & Units Overview
5.11.2 - Measurement & Units Overview - Oxygen Sensor Type
5.11.3 - Measurement & Units Overview - Media
Changing Sensor types may change other settings to their defaults if they conflict with
current settings. For example, changing to a BOS3 low range gas sensor from a BOS1 set
to measure dissolved oxygen in aqueous phase will change the units, the media type and
4-20 output to default BOS3 values.
USEFUL INFORMATION
Measurement
& Units
!
