Ele 521-050, Operating Instructions Manual

Page: 4 / 16

Dissolved Oxygen Meter
521-050
4 9907X0046 Issue 1
4 Displays
4.1 Primary display - 3½ digit display providing direct readout of %
oxygen saturation, % air saturation, mg/l oxygen. Underrange (-1)
and Overrange (1) symbols will be displayed if the instrument is
reading outside the ranges as shown below:
Primary Ranges:
% oxygen saturation -5 to 25.0%
% air saturation -5 to 199%
mg/l oxygen -5 to 19.99mg/l
4.2 Secondary display
– 4 digit display showing temperature (manual
temperature compensation value if used with a non-standard sensor,
or ATC temperature using the standard probe) in °C or °F.
Manually adjusted pressure values (Bar) and salinity values (g/l) will
be shown when the relevant mode is selected.
4.3 CAL annunciator
– indicates when a calibration is being performed.
4.4 Battery Life Indication
– 4 levels will be shown ranging from 25%, 25-
50%, 50-75% and 75-100%. Sensor calibration data and user
parameters are retained during battery replacement.
4.5 Mode annunciator
– indicates which mode of operation is selected.
4.6 MAN
– this is displayed to indicate when manual temperature
compensation (only operates with non-standard probes or if the
temperature sensor in the probe is defective), salinity or pressure
value adjustment is being performed.
4.7 RCL annunciator
– this indicates that the displayed reading is a
stored value recalled from internal memory.