Thermo Fisher Scientific Alpha DO 2000 - Manual (Page 21)

Instruction manual
Alpha DO 2000
4. Normal Operation
4.1 Measurement Mode
When the controller/transmitter is powered on, the display first shows all
segments briefly, and then the controller/transmitter automatically enters into
the Measurement mode.
Î NOTE: To guarantee accurate readings the measuring system (transmitter
and sensor) must be calibrated.
The mode indicator “MEAS” at the top of
the display indicates that the transmitter
is in Measurement mode. The upper
alpha-numerical display shows the
measured dissolved oxygen value (in %,
mg/l or ppm), while the lower display
shows the temperature value (in °C or
°F)
MEAS
°C
ATC
%
100.0
READY
25.0
The annunciators “%”, “mg/l” or “ppm” at the upper right side of the display
indicate the current measurement mode setting whether the transmitter is set
for %, mg/l or ppm measurement.
From Measurement mode you can access Calibration mode and Setup
mode by pressing the CAL key or ENT key followed by the corresponding
security code. For detailed information refer to section 5 “Calibration mode”
or section 6 “Setup mode”, respectively.
By pressing the REL key in Measurement mode you can view the actual
relay set points. By pressing the MODE key followed by the corresponding
security code in Measurement mode you can switch relay operation mode
from automatic to manual. For detailed information refer to section 7 “Relay
Modes”.
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