ABB AX400 Series AX460/AX466 pH/ORP Analyzer User Guide

Cleaning function: If alarm 3 is configured for cleaning, the operation page will display the cleaning status and manual start option.

Programming and Configuration

The programming menu allows users to customize the behavior of the analyzer according to specific application requirements. Entering programming mode usually requires entering security code.

1. Configure display

The contrast ratio and backlight mode of the display screen can be configured (normally on or automatically turned off after 60 seconds) to adapt to different environmental lighting conditions and achieve energy saving.

2. Configure sensors

Probe type: Select the measurement type (pH or Redox/ORP) for each input channel.

Temperature sensor type: Select the type of RTD connected (Pt100, Pt1000, or Balco 3K).

Measurement unit: Select the temperature unit (° C or ° F).

Solution temperature compensation coefficient: For applications that require process solution compensation, a compensation coefficient can be configured.

Calibration options: Enable or disable sensor calibration function, set calibration low limit (slope), etc.

3. Configure alarms

The analyzer comes standard with 3 alarm relays, which can be expanded to 5 if an optional board is installed. Each alarm can be independently configured:

Alarm allocation: Assign alarms to specific sensors or parameters (such as pH A, temperature B, etc.).

Alarm type: can be selected as high alarm, low alarm, or diagnostic alarm.

Fault safety: Select whether to enable the fault safety mode (relay action when power is off).

Setpoint: Set the threshold for triggering an alarm. PH Setpoint Range: -2.00 to 16.00 pH; mV Setpoint Range: -2000 to 2000 mV; Temperature Setpoint Range: -10.0 to 150.0 ° C or 14.0 to 302.0 ° F.

Lag: A differential set point of 0% to 5% of the programmable set value to prevent frequent shaking of alarms near the threshold.

Delay: Set the delay time (0 to 60 seconds) between the occurrence of an alarm condition and the activation of the relay/LED.

Special Function of Alarm 3- Cleaning Cycle Configuration:

When alarm type 3 is set to "Wash", the following parameters can be configured:

Cleaning frequency: 5 minutes to 24 hours, fully configurable.

Cleaning duration: 15 seconds to 10 minutes, fully configurable.

Recovery cycle: 30 seconds to 5 minutes, fully configurable.

Cleaning signal type: continuous signal or pulse signal (pulse on and off time can be set).

4. Configure output

Analog output: Two (standard) or four (optional) fully isolated analog outputs can be configured. The output current can be selected from 0-10mA, 0-20mA, or 4-20mA. Each output can be assigned to any measured variable (pH, mV, or temperature). Programmable output points to any value between 0-22mA in case of system failure to indicate the fault status.

Maximum load resistance: 750 Ω at 20mA.

Accuracy: ± 0.25% FSD, ± 5% reading.

Resolution: 0.1% at 10mA, 0.05% at 20mA.

5. Configure clock and log

Real time clock: records time and date, used for logging and automatic cleaning functions (optional board required).

Log: Electronic recording of major process events and calibration data (optional board required). Configurable event types and frequencies for logging.

6. Configure security

Security code: Set a four digit code to protect programming functionality. Disable security protection when the code is set to zero.

7. Test output and maintenance

Provide manual testing simulation output and relay functions for easy debugging and troubleshooting.

Sensor calibration

AX460/AX466 offers multiple flexible calibration modes to ensure measurement accuracy.

1. Set buffer type (pH only)

You can choose from the preset buffer table:

ABB

DIN 19266

Merck

NIST

US Tech

Two user-defined buffer tables

2. User defined buffer solution

Allow users to manually input the pH values of two buffer solutions at different temperatures to match non-standard buffer solutions.

3. Automatic and manual single/two-point calibration (pH only)

Single point calibration: used to adjust zero offset.

Two point calibration: Simultaneously adjust the zero point and slope to achieve optimal accuracy.

Automatic stability check: During the calibration process, the analyzer will automatically monitor the signal stability and only record the calibration point after the signal is stable.

Calibration message:

PASSED: The new calibration coefficient has been accepted (with a slope of 40% to 105%).

CAL LOW SLOPE: Calibration passed, but electrode pair fatigue, recommended replacement (slope 60% to 90%).

PH CAL FAILED: Calibration failed, ignoring new coefficients and retaining the last valid coefficient (slope 0% or 40% to 70%). Check the buffer value and repeat calibration. If the fault persists, replace the electrode.

4. Offset adjustment (Redox/ORP only)

Used to compensate for the potential drift of the reference electrode by measuring a known standard solution and adjusting the offset.

5. Capture calibration (pH only)

Allow single point calibration using process samples to align analyzer readings with laboratory reference values.

Installation Guide

1. Site selection requirements

Installed in a location without excessive vibration.