Halland Instruments AS

Applications in other industries:

The PH-1600 analyzer:

The ASRM-1300 automatic sedimentaion rate measuring station:

The PH-1400 analyzer:

pH and sedimentation rate analyzers for the alumina industry.

“PH-1600” and “PH-1400”, unique on-line pH analyzers for the alumina production processes.

The “PH-1600” pH analyzer dilutes the sample and measures the pH of saturated or near saturated solutions in alumina production plants. Saturated solutions have profound influence on the pH electrode response. For this reason dilution of the process fluids before measurement is a necessity. It is the only analyzer that provide measurements with high and very long long-term accuracy in saturated solutions. The “PH-1400” pH analyzer is for non-saturated solutions.
The analyzers have very good long-term accuracy and do not require frequent calibrations.
The problem is that other pH measuring systems have low accuracy and short lifetime of the electrodes.
The main causes of the problems are poisoning of the reference electrode and build-up of a layer of coating from the process solution on the pH electrode.
Our PH-1600 and PH-1400 analyzers have high accuracy and the lifetime of the electrodes are very long, many months or even years. The reference electrode is never poisoned and the pH electrode surface is kept clean by an advanced cleaning system.
Other systems require frequent calibrations, however, this only disguise the problem, the problem of low accuracy persists. A short lifetime of the electrodes or combination electrode is a symptom of low average accuracy, making process optimization impossible.

“PH-1400”, the pH analyzer for the wastewater treatment plants in the alumina industry.
The “PH-1400” pH analyzer delivers accurate pH measurement  in the wastewater treatment processes.
The efficiency is increased and the overdosing of the pH reagents is eliminated.
The problem is that other pH measuring systems have low accuracy and short lifetime of the electrodes. The nature of the lime, sodium hydroxide and sulfide processes causes build-up of a layer of precipitations on the pH electrode and the solutions poisons the reference electrode, this drastically decreases the accuracy of the pH measurements.
Our pH analyzers have high accuracy and the lifetime of the electrodes are very long, many months or even years. The reference electrode is never poisoned and the pH electrode surface is kept clean by an advanced cleaning system.
Other systems require frequent calibrations, however, this only disguise the problem, the problem of low accuracy persists. A short lifetime of the electrodes or combination electrode is a symptom of low average accuracy, making process optimization impossible.   

 “ASRM-1300”, the automatic sedimentation rate measuring station for the red mud separation process and for the precipitation process of hydrates.
The ASRM-1300 measures the time required for the sample to become clear or translucent, down to a fixed (adustable) distance beneath the surface. The instrument sucks a sample from the process to a measuring cell (cylinder), where the required time for settling is measured. The sample is then returned to the process. Then the instrument sucks up a dose of detergent, for instance an acid, from a container and sprays the detergent into the cylinder. The cylinder is then washed with water, and the cycle is repeated. The frequency of washing with detergent is programmable. The instrument gives you a unique possibility for process optimizing, because it measures the response to changes in settling properties so rapidly and automatically. A manual sample is not the same, it is not possible to replicate an automatic measurement because the manual measurement is depending of how accurate the operator is.
This is truly an early warning system for any oncoming process difficulties. The instrument is a complete-working unit for sampling, measuring and washing of the cell. It has 4-20 mA output and Modbus RTU computer interface.
The sample is usually taken from a tank, launder or pipe, before the thickener or filtration station, but after the addition of flocculant, if used.

Function, “PH-1600” and “PH-1400”:
The PH-1600 is an automatic pH analyzer with a sophisticated system for cleaning of the electrodes. The pH value of the solution is measured discontinuously. Since the cycle time is very short, the measurement can be used as a continuous measurement. The cycle takes 1-3 minutes, if frequent measurements are not needed the sample interval can be increased.
The cycle has the following steps:
1. The analyzer sucks up a sample from the process.
2. The PH-1600 analyzer dilutes the sample using hot or cold water, but preferably a little hotter or the same temperature as the process solution. The PH-1400 analyzer omits this step.
3. The pH is measured.
4. The sample is returned to the process.
5. The analyzer sucks up a fixed amount of washing detergent, most often an acid.
6. The electrodes are sprayed with this solution.
7. After a pause the electrodes are sprayed with hot water.
8. The washing water is returned to the process and the cycles starts again with step one.

Step number 5 and 6 can be omitted or set to execute only at some cycles, for instance every tenth cycle.

The following properties distinguish our analyzer from other known technology:
1. Most reliable, infrequent error with the analyzer or the electrodes, very low-maintenance.
2. High short-term and long-term accuracy.
3. Very long life of the electrodes, it is not possible to get high long-term accuracy without long electrode life.
4. Other systems require frequent calibration and still are not accurate. Our analyzer provides high accuracy even with weeks’ interval between calibrations.
5. It is fast and easy to calibrate the analyzer, there is no sample head which must be dismantled for calibration.
6. It is easy to install the analyzer and normally no encroachment in the process equipment is needed.