User Guide

3
1. Introduction
The alpha pH 100 series pH/ORP Controller/Transmitter is the
latest innovation of process controllers from Eutech
Instruments. Incorporated with the ASIC (Application Specific
Integrated Circuit) microprocessor technology, this panel-
mounted on-line controller provides many user-friendly features
desirable in pH/ORP controllers.
This versatile pH/ORP unit can be used either for measuring
and monitoring pH or ORP values at one time. It cannot be
used for measuring both parameters simultaneously. When
shipped, it will be set internally to the pH mode by means of an
internal jumper. This jumper can be reset by you to select
between the pH and ORP mode.
Some of the features of this Controller are :
• Automatic temperature compensation (with PT 100)
• Manual temperature compensation setting without the
temperature probe
• Push button calibration up to 3 points
• Offset adjustment
• High and low alarm triggering relays
• User-defined password feature to prevent unauthorized
entry to change the calibration data, hysteresis function,
high and low setpoints information
• Alarm and operational message annunciators
• Hysteresis function to prevent chattering of relays around
the setpoint
• High-end transmitter model with 4-20 mA current output
for datalogging purposes (pH CTP0100 only)
• Built-in memory backup to ensure that calibration and
other information will not be erased if power supply fails
• Switchable mains voltages of 110 VAC or 220 VAC via
user selectable internal jumper