Specifications

Instruction Manual Alpha DO 500
3
2. Getting Started
2.1 Description of Instrument
The Thermo Scientific Alpha DO 500 Transmitter 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 or 3-wire Pt100 sensors. The DO
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.
The Alpha DO 500 Transmitter has many user-friendly and safety features
which include:
x Push-button keypad for calibration and setup
x Built-in non-volatile memory to ensure that calibration and other
information are not erased if power supply fails
x Menu-driven program that simplifies setup
x Automatic temperature compensation (ATC)
x Manual temperature compensation setting without the ATC probe, with
independent setting for calibration and process temperature
x Large dual display LCD for easy reading with clear multiple
annunciators, operational mode indicators and error indicators.
x Galvanically isolated current output of 4 to 20mA
x Hold function to freeze output current (22mA)
x Out of range current indication (3.8mA)
x Protection against electromagnetic interference
Power Supply Requirements (SL2 Position)
This transmitter requires a 12 to 24V DC power supply. Other Transmitters
and/or a chart recorder may be connected in series.
1. Insert positive loop wire from power supply to pin 1, tighten screw.
2. Insert negative loop wire to pin 2, tighten screw. This wire may be linked to a
chart recorder or to negative terminal of power supply.
Alpha pH500
Power Supply
Chart recorder
1
2