ABB AX460/10001 Single and Dual Input pH/Redox Analyzers

ABB AX460/10001 Single and Dual Input pH/Redox Analyzers

System Description
The AX400 Series pH/Redox (ORP) analyzers and associated electrode systems have been designed for continuous monitoring and control of pH and Redox (ORP). The electrode system can be standardized to the analyzer using the built-in calibration facility and a single point buffering facility provides
easy re-calibration after initial standardization.The analyzer is available in wall-/pipe-mount or panel-mount versions with either one or two programmable, pH or Redox (ORP) input channels, each with its own associated temperature input channel. When making temperature compensated measurements, the sample temperature is sensed by a resistance thermometer (Pt100, Pt1000 or Balco 3K) mounted
in the electrode system.
The analyzer can be configured for and connected to either a standard pH input (single, high impedence input >1013Ω) or differential pH input (dual, high impedence inputs, both >1013Ω).Differential pH input is designed for use with pH electrode systems that incorporate a solution earth (ground) rod. The
ABB AX460/10001 Single and Dual Input pH/Redox Analyzers

measuring electrode and reference electrode signals are measured separately using two, high impedence amplifiers and compared with the solution earth (ground) potential. The difference between the results is the value used for the pH measurement.
All models incorporate a wash facility for system cleaning; the alarm 3 relay can be configured to control the wash system either automatically or manually. The relay can be programmed to deliver either a continuous or pulsed signal to control an external power supply to a solenoid or pump and the frequency,duration and recovery time for the wash cycle are also programmable. During a wash cycle, the analog output value is held in its pre-cycle condition.Analyzer operation and programming are performed using five tactile membrane keys on the front panel. Programmed functions are protected from unauthorized alteration by a fourdigit security code.

ABB AX460/10001 Single and Dual Input pH/Redox Analyzers

Relay Contact Protection and Interference Suppression 
If the relays are used to switch loads on and off, the relay contacts can become eroded due to arcing. Arcing also generates radio
frequency interference (RFI) which can result in analyzer malfunctions and incorrect readings. To minimize the effects of RFI, arc
suppression components are required; resistor/capacitor networks for a.c. applications or diodes for d.c. applications. These
components can be connected either across the load or directly across the relay contacts. The RFI components must be fitted to the
relay terminal block along with the supply and load wires – see Fig 6.6.
For AC applications the value of the resistor/capacitor network depends on the load current and inductance that is switched. Initially,
fit a 100R/0.022µF RC suppressor unit (part no. B9303) as shown in Fig. 6.6A. If the analyzer malfunctions (locks up, display goes
blank, resets etc.) the value of the RC network is too low for suppression and an alternative value must be used. If the correct value
cannot be obtained, contact the manufacturer of the switched device for details on the RC unit required.
For DC applications fit a diode as shown in Fig. 6.6B. For general applications use an IN5406 type (600V peak inverse voltage at 3A
– part no. B7363).

ABB AX460/10001 Single and Dual Input pH/Redox Analyzers

ABB AX460/10001 Single and Dual Input pH/Redox Analyzers

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