Single and dual input analyzers for pH/Redox (ORP)
AX416, AX436, AX460, AX466 & AX468 1Introduction
2 IM/AX4PH Rev. P
1 Introduction
1.1 System Description
The AX460 single input and AX466 dual input 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 impedance input >10
13
) or
differential pH input (dual, high impedance inputs, both >10
13
).
Differential pH input is designed for use with pH electrode
systems that incorporate a solution earth (ground) rod. The
measuring electrode and reference electrode signals are
measured separately using two, high impedance 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
four-digit security code.
1.2 PID Control
The AX460 single input pH analyzer incorporates Proportional
Integral Derivative (PID) control as standard. Refer to the
PID Control Supplementary User Guide, IM/AX4PID for a full
description and instructions on how to configure and operate
PID control.
1.3 AX400 Series Analyzer Options
Table 1.1 shows the range of configurations that are possible for
the AX400 Series analyzers. The analyzer detects the type of
input board fitted for each input automatically and displays only
the operating and programming frames applicable to that input
board type. If no input board is fitted for a second input
(Sensor B), Sensor B frames are not displayed.
Model Analyzer Description Sensor A Sensor B
AX410 Single Input 2-Electrode Conductivity (0 to 10,000 µS/cm) 2-Electrode Conductivity –
AX411 Dual Input 2-Electrode Conductivity (0 to 10,000 µS/cm) 2-Electrode Conductivity 2-Electrode Conductivity
AX413 Dual Input 2-Electrode Conductivity and 4-Electrode Conductivity 2-Electrode Conductivity 4-Electrode Conductivity
AX416 Dual Input 2-Electrode Conductivity and pH/Redox (ORP) 2-Electrode Conductivity pH/Redox (ORP)
AX418 Dual Input 2-Electrode Conductivity and Dissolved Oxygen 2-Electrode Conductivity Dissolved Oxygen
AX430 Single Input 4-Electrode Conductivity (0 to 2,000 mS/cm) 4-Electrode Conductivity –
AX433 Dual Input 4-Electrode Conductivity (0 to 2,000 mS/cm) 4-Electrode Conductivity 4-Electrode Conductivity
AX436 Dual Input 4-Electrode Conductivity and pH/Redox (ORP) 4-Electrode Conductivity pH/Redox (ORP)
AX438 Dual Input 4-Electrode Conductivity and Dissolved Oxygen 4-Electrode Conductivity Dissolved Oxygen
AX450 Single Input 2-Electrode Conductivity (USP) 2-Electrode Conductivity –
AX455 Dual Input 2-Electrode Conductivity (USP) 2-Electrode Conductivity 2-Electrode Conductivity
AX456 Dual Input 2-Electrode Conductivity (USP) and pH/Redox (ORP) 2-Electrode Conductivity pH/Redox (ORP)
AX460 Single Input pH/Redox (ORP) pH/Redox (ORP) –
AX466 Dual Input pH/Redox (ORP) pH/Redox (ORP) pH/Redox (ORP)
AX468 Dual Input pH/Redox (ORP) and Dissolved Oxygen pH/Redox (ORP) Dissolved Oxygen
AX480 Single Input Dissolved Oxygen Dissolved Oxygen –
AX488 Dual Input Dissolved Oxygen Dissolved Oxygen Dissolved Oxygen
Table 1.1 AX400 Series Analyzer Options
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