Thermo Fisher Scientific Alpha pH 800 - Manual (Page 8)

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1 INTRODUCTION
1.1 Description of Unit
Thank you for purchasing ¼ DIN 800 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 limit control. This controller has many user-
friendly and safety features which include:
• Menu-driven program that simplifies set-up
• Built-in non-volatile memory backup to ensure that calibration and
other information are not erased if power supply fails
• Push-button two-point calibration and electrode offset adjustment
from the keypad
• Automatic temperature compensation (ATC)
• Manual temperature compensation setting without the ATC probe, with
independent setting for calibration and process temperature
• 0 to 2000 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
• Asymmetrical/symmetrical input for pH/ORP operation
• Large dual display LCD for easy reading with clear multiple
annunciators, alarm status, operational and error messages
• Two switching contacts as set-point triggering relays
• Hold function freezes output current (4/20mA) and control relays
• LED indicators signal control activities to monitor controller status from a
distance