Thermo Fisher Scientific Alpha DO 1000 User Manual
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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.