1
1 INTRODUCTION
1.1 Description
of
Unit
Thank you for purchasing the Thermo Scientific’s ¼ DIN Alpha DO 1000 series
Dissolved Oxygen process controller. This unit is used for measuring either in %
saturation, mg/l or ppm, one at a time, and the operational mode is switchable from
the menu. You can use this unit to measure Dissolved Oxygen with limit or
proportional control. This controller has many user-friendly and safety features
which include:
•
Menu-driven program
that simplifies set-up
•
Built-in Memory backup
to ensure that calibration data and other information
are not erased if power supply fails
•
Push-button one-/two-point calibration and electrode offset adjustment
from the keypad
•
Automatic temperature compensation (ATC)
•
Manual temperature compensation
with independent setting for calibration
and process temperature
•
0 to 1999 second
time delay adjustment
on all relays – minimise false alarms
•
Separately
adjustable
high and low set point hysteresis
(dead bands)
prevent chattering of relays around the set points
•
Three control modes
: limit control, proportional pulse length or proportional
pulse frequency
•
Large dual display LCD
for easy reading with clear multiple annunciators,
alarm status and operational message annunciators
•
Two switching contacts as set-point triggering relays
and an alarm output
relay
•
Separate
alarm relay
alerts you when set points have exceeded the limits and
if the Pt100 wires are broken or disconnected during the ATC function
•
Hold
function freezes output current
(0/4...20mA)
and releases control relays
•
LED indicators
signal control activities to monitor controller status from a
distance
•
Protection against electromagnetic interference
- galvanically isolated 0/4 -
20mA output provides safety for data logging and control purposes
1.2
Applications
Use this controller in panel mounted enclosures for applications such as water
treatment and monitoring, galvanic-decontamination, chemical processing, food
processing, clean or waste water control and neutralization process.
Summary of Contents for Alpha DO 1000
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