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

Stay away from harmful vapors and/or dripping fluids.

It is best to install it at eye level for unobstructed viewing of the front panel display and controls.

2. Installation method

Wall mounted/pipe rack installation: Provide installation brackets that can be installed on walls or vertical pipes. Protection level IP66/NEMA4X.

Panel installation: 96mm x 96mm standard size, suitable for control panel installation. The front panel protection level is IP66/NEMA4X.

3. Electrical Connections (General Precautions)

Grounding: The power ground must be connected to ensure personnel safety, reduce the impact of RFI interference, and ensure the correct operation of the power interference filter. The chassis is equipped with grounding bolts for busbar grounding.

Cable wiring: Always separate the signal output/pH electrode cable from the power line/relay cable, ideally using a grounded metal conduit. Use twisted pair output leads or shielded cables, and connect the shielding layer to the chassis grounding bolt.

Cable entry: Ensure that the use of cable connectors, conduit fittings, and blind plugs does not damage the NEMA4X/IP66 rating.

Relay: The relay contacts are pressure free contacts and must be connected in series with the power supply and the alarm/control equipment to be driven. Ensure that the contact rating is not exceeded.

4. Relay contact protection and interference suppression

When a relay is used to switch loads, the contacts will corrode due to arcing. Electric arcs can also generate radio frequency interference, which may cause analyzer malfunctions and reading errors. To minimize the impact of RFI, arc suppression components are required:

Communication application: Use a resistor/capacitor network (it is recommended to initially use a 100 Ω/0.022 μ F RC suppressor, part number B9303).

DC application: Use diode (recommended IN5406 type, 600V peak reverse voltage, 3A, part number B7363).

5. Terminal connection

Sensors A/B: Connect them correctly according to the electrode type (with or without solution grounding) and temperature compensator type (2-wire or 3-wire) as shown in Figure 6.9 or 6.11 of the manual.

Analog output: Connect to the corresponding+and - terminals.

Alarm relay: connected to the common terminal (C), normally open terminal (NO), or normally closed terminal (NC).

Calibration verification and troubleshooting

1. Factory setup

The analyzer has been calibrated before leaving the factory, and routine recalibration is not necessary. It is recommended to attempt recalibration only when the input board has been replaced or the calibration has been tampered with. Before attempting to recalibrate, use appropriately calibrated testing equipment to test the accuracy of the analyzer.

Required equipment: millivolt source, decimal resistance box, digital milliampere meter.

Preparation: Disconnect the electrode and output, connect the analog device, and calibrate according to the overall factory setup flowchart in Figure 7.2 of the manual.

2. Simple troubleshooting

Error message:

A: FAULT PT100/A: FAULT PT1000/A: FAULT BALCO: The temperature compensator or connection of sensor A is open or short circuited.

A: CAL LOW SLOPE/B: CAL LOW SLOPE: Electrode fatigue, replacement recommended.

A: PH CAL FAILED/B: PH CAL FAILED: Calibration failed, check the buffer and repeat. If the fault persists, replace the electrode.

WASH INHIBITED: The cleaning function in the operation page needs to be set to off and turned on.

Calibration failure or no response to pH/Redox changes:

Most issues are related to electrodes and cables. As a preliminary inspection, replace the electrode.

Check that all program parameters are entered correctly and have not been accidentally changed.

Use a pH simulator to check the response of the analyzer to millivolt input. If the analyzer does not respond to the input, there may be a fault and it needs to be returned for repair.

Perform impedance check. If the test fails, check whether there is moisture inside the transmitter, especially in the terminal box, and use a hot air dryer to remove the moisture.

Check temperature input: Disconnect the RTD lead, connect the resistance box directly to the analyzer input, and check whether the value displayed by the 

Detailed technical specifications

Parameter specifications

Input 1 or 2 pH/mV inputs (AX466) and the solution ground; 1 or 2 temperature sensors (AX466)

Input resistance glass electrode>1 × 10 ¹³ Ω; reference electrode 1 × 10 ¹³ Ω

Measurement range pH: -2.00 to 16.00; ORP: -1200 to+1200 mV

Minimum range: Any 2 pH or 100 mV

Resolution 0.01 pH

Precision 0.01 pH

Temperature compensation automatic or manual Nernst compensation; Process solution compensation (configurable coefficient)

Temperature compensation range -10 to 150 ° C (14 to 302 ° F)

Temperature sensor programmable Pt100, Pt1000 or Balco 3K

Display dual 5-digit 7-segment backlit LCD; 16 character single line dot matrix information display

Analog output with 2 channels (standard) or 4 channels (optional) completely isolated; 0-10mA, 0-20mA or 4-20mA; maximum load 750 Ω @ 20mA

Relay outputs 3 (standard) or 5 (optional); Single blade double throw; 5A，115/230V AC，5A DC