EUTECH INSTRUMENTS alpha-pH 2000D Manuál s instrukcemi stáhnout pdf (Strana 9)

Instruction Manual αlpha-pH2000D

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2 PRODUCT DESCRIPTION

2.1 Description of unit

The αlpha 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 Pt100 / Pt1000 sensors or 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

Pt100/Pt1000 or 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.

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EUTECH INSTRUMENTS alpha-pH 2000D Manuál s instrukcemi Strana 9