Thermo Fisher Scientific Alpha DO 2000 - Manual (Page 11)

Instruction manual
Alpha DO 2000
2. Getting Started
2.1 Description of Instrument
The Alpha DO 2000 is used for measuring dissolved oxygen (in % saturation,
mg/l or ppm) and temperature values. The dissolved oxygen values can be
measured using limit or P/PI control.
The transmitter is available in two versions, one for panel mounting and one
for wall mounting in a enclosure. The transmitter can be used for applications
such as water treatment and monitoring, chemical and food processing,
clean and wastewater control and fish farming.
This controller/transmitter has many user-friendly and safety features which
include:
• Menu-driven program that simplifies set-up
• Built-in non-volatile memory to ensure that calibration and other
information are not erased if power supply fails.
• Push-button for calibration and sensor offset adjustment from the keypad.
• Automatic
temperature compensation (ATC).
• Manual temperature compensation setting without the ATC probe, with
independent setting for calibration and process temperature.
• Two galvanically isolated current outputs 0/4...20mA.
• 0 to 1999 seconds time delay adjustment on all relays – minimizes false
alarms.
• Separately adjustable high and low set-point hysteresis (dead bands)
prevent chattering of relays around the set points.
• Three control modes: limit controller, P controller and PI controller (P/PI
controller as pulse length or pulse frequency).
• Large dual display LCD for easy reading with clear multiple annunciators,
alarm status, operational and error messages.
• Two switching contacts as set-point relays.
• Separate alarm relay alerting you to set point limits exceeded for a certain
time and if the NTC wires are broken or disconnected during the ATC
function.
• Wash relay.
• Hold function to freeze output current (0/4...20mA) and release control
relays.
• LED indicators signal control activities to visually monitor transmitter
status from a distance.
• Protection against electromagnetic interference.
• Back lit and UV light protected LC display.
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