ABB AX411 Single and dual input analyzers

ABB AX411 Single and dual input analyzers

INTRODUCTION

The AX400 analyzers incorporate the latest technology to provide highly reliable, flexible, feature-packed devices that satisfy a diverse range of process monitoring and control applications. The complete range encompasses solutions for pH/Redox (ORP), conductivity and dissolved oxygen. Models AX41x and AX45x enable continuous measurements of one or two low-level conductivity points with simultaneous local display and retransmission. The analyzers are used with ABB 2-electrode conductivity cells providing measurements with exceptional accuracy and performance.

High functionality as standard

All versions are supplied with two fully-isolated current outputs as standard, that can be assigned to the measured parameter, the sample temperature or any appropriate calculated variables. Three programmable relay set points are available that can also be assigned as required. Innovative features such as a power saving display and a diagnostic current output option all contribute to low cost of ownership.

Plug-and-produce expanded control

An advanced function card provides an additional two current outputs and two further alarm relays that can be assigned to either measured values or sample temperature. ABB plug-and-produce software automatically reconfigures the analyzer if an option board is added later. No user programming is necessary. A real-time clock and logbook are also included, making the full-facility versions extremely powerful and versatile.

Significantly reduced   maintenance costs

The AX400 analyzers are supplied as standard for 85 to 265 V AC operation. There are no inner switches to set. They can also be provided for 24 V AC or 12 to 30 V DC supply and recognize automatically which of the two supplies is being used. 24 V DC operation reduces maintenance costs significantly by negating the need for costly, yearly safety tests to ensure compliance with safety procedures.

Energy saving display

The backlit display has been designed to operate in all types of environments and shows both the measured parameter(s) and, on a separate 16-character display line, diagnostic and computed information. On dual-input analyzers both measured parameters are displayed simultaneously. For conservation of energy, the backlight can be set to switch off automatically after 60 s of inactivity.

Single and dual input analyzers

Both single and dual-input analyzers provide accurate measurement of low-level conductivity and can be configured for ranges in µS cm–1, µS m–1, mS cm–1 and mS m–1. Alternatively, the instrument can be set up for resistivity in MW-cm, total dissolved solids and salinity. In addition, the dual-input analyzer calculates, displays and transmits: 

 • Ratio of cell 1 / cell 2 

 • Difference cell 1 – cell 2 

 • % Passage (cell 1 / cell 2) x 100 

 • % Rejection (1 – [cell 1 / cell 2]) x 100 

 • Inferred pH

Cation conductivity and   inferred pH measurement

In low conductivity, ammoniated boiler waters, the AX411 analyzer can calculate an inferred pH measurement from the conductivity and a preset ammonia concentration. With this method, one AX411 provides cation conductivity, a direct output of pH, reduced cost and none of the maintenance associated with pH electrodes. Self-monitoring of the validity of the pH measurement is achieved by checking that an after-cation conductivity value is sufficiently low. This measurement is provided by the second input of the AX411 analyzer. Alarm contacts can be configured for cation conductivity, invalid pH and exhausted resin.

Comprehensive temperature compensations

AX41x and AX45x conductivity analyzers provide true temperature compensation for all high-purity water applications: 

 • Raw (uncompensated) conductivity– USP<645> water for injection and purified water 

 • NaCl– General monitoring

– Mixed-bed exchanger

– Final polisher effluent

– Cation exchanger inlet

– Anion exchanger effluent

– Reverse osmosis 

 • HCl

– Cation exchanger outlet

– Degassed cation conductivity

– Semiconductor rinse and reclaim water 

 • NH3– Ammonia-treated make-up and boiler feed water

– Condenser sampling applications

– Hot well sampling applications

– Before-cation column applications

– Inferred pH in ammonia-dosed waters 

 • Ultra Pure Water (UPW) 

– Temperature effect of pure water only 

 • Linear– Manual entry of temperature coefficient