alpha-pH 1000
1
1 INTRODUCTION
1.1
Description of Unit
Thank you for purchasing Eutech’s ¼ DIN alpha-1000 series pH/ORP process controllers. This unit
is used for measuring either pH or ORP parameter one at a time, and the operational mode is
switchable from the menu. You can use this unit to measure pH or ORP with proportional or limit
control. This controller has many user-friendly and safety features which include:
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Menu-driven program that simplifies set-up
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Built-in memory backup to ensure that calibration and other information are not erased if
power supply fails
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Push-button two-point calibration and electrode offset adjustment from the keypad
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Automatic temperature compensation (ATC)
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Manual temperature compensation setting without the ATC probe, with independent setting
for calibration and process temperature
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0 to 2000 second time delay adjustment on all relays – minimise false alarms
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Separately adjustable high and low set point hysteresis (dead bands) prevent chattering of
relays around the set points
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Asymmetrical/symmetrical input for pH/ORP mode of operation
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Three control modes: limit, proportional pulse length or proportional pulse frequency
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Large dual display LCD for easy reading with clear multiple annunciators, alarm status,
operational and error messages
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Two switching contacts as set-point triggering relays and an alarm output relay
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A third relay that can be set up to perform either Alarm or Wash function
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When set to work as Alarm relay, alerts you to set points exceeded for a set-point limits for
certain time and if the Pt100/Pt1000 wires are broken or disconnected during the ATC function
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Programmable duration and frequency in the Wash mode
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Hold function freezes output current (0/4...20mA) and releases control relays
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LED indicators signal control activities to monitor controller status from a distance
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Protection against electromagnetic interference - galvanically isolated 0/4..20mA output
provides safety for data logging and control purposes
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Choice of 7 buffers from USA or NIST standards
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 neutralisation process.
