Instruction Manual
α
lpha-pH2000D
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2
PRODUCT DESCRIPTION
2.1
Description of unit
The
α
lpha pH 2000D is used for measuring pH and temperature values. The pH values can be
measured using industrial differential & combination pH sensors. The temperature values can
be measured using 2-wire / 3-wire NTC300 thermistor. The transmitter is available in a wall
mounting enclosure. The controller / transmitter can be used for applications such as water
treatment and monitoring, galvanic-decontamination, chemical processing, food processing,
clean or wastewater control and neutralization processes.
This transmitter has many user-friendly and safety features which include:
•
Push-button for calibration and sensor offset adjustment from the keypad.
•
Built-in non-volatile memory to ensure that calibration and other information are not
erased if power supply fails.
•
Menu-driven program that simplifies set-up.
•
Automatic temperature compensation (ATC).
•
Manual temperature compensation setting without the ATC probe, with independent
setting for calibration and process temperature.
•
Two galvanically isolated current outputs 0/4...20mA.
•
Two switching contacts as set-point relays.
•
0 to 2000 seconds time delay adjustment on all relays – minimizes false alarms.
•
Separately adjustable high and low set-point hysteresis (dead bands) prevent chattering
of relays around the set points.
•
Three control modes: limit controller, P controller and PI controller (P/PI controller as
pulse length or pulse frequency).
•
Large dual display LCD for easy reading with clear multiple annunciators, alarm status,
operational and error messages.
•
Separate alarm relay alerting you to set point limits exceeded for a certain time and if the
NTC300 thermistor wires are broken or disconnected during the ATC function.
•
Wash relay.
•
Hold function to freeze output current (0/4...20mA) and release control relays.
•
LED indicators signal control activities to visually monitor transmitter status from a
distance.
•
Protection against electromagnetic interference.
•
Back lit and UV light protected LC display.
