Instruction manual

Instruction manual αlpha DO 2000

2 PRODUCT DESCRIPTION

2.1 Description of unit

The αlpha DO 2000W is used for measuring dissolved oxygen and temperature values. The

dissolved oxygen values can be measured using industrial dissolved oxygen sensors. The

temperature values can be measured using 2-wire / 3-wire Pt100 /Pt1000 sensors. The

controller / transmitter can be used for applications such as water treatment and monitoring,

galvanic-decontamination, chemical processing, food processing, clean or wastewater control

and neutralization processes.

This controller/transmitter has many user-friendly and safety features which include:

• Push-button for calibration and sensor offset adjustment from the keypad.

• Built-in non-volatile memory to ensure that calibration and other information are not

erased if power supply fails.

• Menu-driven program that simplifies set-up.

• 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.

• Two switching contacts as set-point relays.

• 0 to 2000 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.

• Separate alarm relay alerting you to set point limits exceeded for a certain time and if the

Pt100/Pt1000 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.