Turbitechw² LS suspended solids, turbidity sensor
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the HaloSense residual chlorine sensor is used to measure the concentration of free residual chlorine. In drinking water, water treatment or swimming pool water, it mainly refers to HOCl (hypochlorite) and OCl (hypochlorite). The relevant content of these two components depends on the ph value in the solution. In the solution with low ph value (PH6, or lower), all the residual chlorine is HOCI, and in the solution with higher ph value, most of the residual chlorine will be OCl. The traditional amperometric measurement system and membrane sensor can only measure HOCl, and need to be treated with buffer to an accurate ph value, so as not to let the change of ph value in the sample water affect the whole residual chlorine measurement. The probe of the residual chlorine measuring instrument in the CRIUS series controller will not be affected by the change of ph value under the same conditions. This means that in most factories, only changes in ph will need to be corrected. If a factory has a high and changing PH value, the sensor can still be used without adding acid buffer, but a PH sensor will be needed to compensate for the changing PH value. See the IST02 sample.
The HaloSense sensor is a constant potential ampere three-electrode sensor. The residual chlorine molecules move through the membrane and into the electrolytic solution. The electrolytic solution has a relatively low ph value, where most of the OCl is converted into HOCI. All HOCI are reduced in the gold negative electrode, and the synthetic ions will pass through the electrolytic solution, where they are oxidized in the silver/silver chloride positive electrode. The current value is proportional to the concentration of residual chlorine in the sample. There is a potential difference between the negative and positive electrodes, which will catalyze the reduction of HOCI.
when the sensor reaches a steady state, it is used to measure chlorine. To establish a steady state, the following three conditions are required:
- there is a potential difference between the electrodes (e. G., power-up)
- there is free chlorine on the membrane (free chlorine in water)
- the appearance and replacement speed of chlorine is faster than the speed at which it is consumed by the sensor (for example, in the supplementary fluid, the minimum flow rate is required> 200 ml/min)
- the establishment of "steady state" is called polarization. If any of these conditions are missing, the sensor will be depolarized.
2. The first polarization usually takes 4 or 5 hours, but if the chlorine concentration is very low (<0.2ppm), it will take up to 18 hours.
After that, the polarization time will be reduced to 30 minutes to 120 minutes (after maintenance).
3. The sensor is not suitable for measuring chlorine at a concentration of 0ppm. (The analyzer usually used to measure low-concentration free chlorine will be able to measure the quantity in a short period of time
No chlorine solution, but if the sensor is exposed to a chlorine solution with a concentration of 0ppm for a long time, it will be depolarized).
4. In the worst case, the results measured by the same two analyzers are within 0.2ppm.
5. A flow rate is required because the diffusion rate through the membrane is higher than the speed through water. If there is no flow rate, chlorine will be exhausted and its value will decrease.
6. In the case of ph less than 4, what you get is gaseous chlorine and a very sensitive unstable probe.
7. The effective pH value range of the analyzer is pH 4.5 - pH 10. Higher ph values require the addition of CO2 or acidic buffers.
8. Zero adjustment is usually not required. Check the zero point requires the use of free chlorine, free ozone and ice water and boiling water. In any other case, you will get one.
The wrong zero.
9. The zero point has good reliability because the water and the electrode are separated by a hydrophilic membrane and a reference electrode. When the device adopts polarography, when 400mV
No current = no chlorine.
10. If the manganese dirt is very high, you need to find a way to remove it before entering the sensor. There is no problem at normal levels.
11. The life of the electrode is usually 10 years.
12. The proposed membrane change time is 18 months for the residual chlorine and total chlorine analyzer used in drinking water.
13. The proposed electrode replacement time is 3-6 months.
14. The recovery time after the cut-off is 2 - 3 minutes. Unless the time is extended, it will take 60 minutes to recover.
15. Any grease in the sample will block the membrane. If the probe is used in sewage, please consider carefully -
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Size80mm（Diameter）x 470（Length） mm
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Weight2.2 kg (Including 10m cable)
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Protection levelDetector: IP68, maximum depth of 2 m (underwater type) Transmitter: IP65 (jetproof type) Pollution degree 2
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Housing materialStainless steel (1.4571/1.4404) or titanium (3.7035)
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Contact with water1.316 Stainless steel, glass
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Sealing materialNitrile
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Cable size10m standard, 100m longest
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Maintenance intervalReplace the cleaning seal for about three years
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Operating temperatur-20 to 70°C
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Storage temperature-20 to 60°C
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PositionIndoor/outdoor
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Power supply2 Volts from Monitor
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Digital communicatioRS485
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Measurement accuracyBetter than 5%
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Resolution+/-2% Depending on the setting range
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RepeatabilityBetter than +/-1%
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Measuring principleInfrared light
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Wavelength860 nm Infrared light
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Response time0.5s
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Allow overpressure10m
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Flow rateWill not be affected by the flow rate, but avoid static points and excessive fluctuations
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Maximum range0 – 500 NTU, expandable to 0-1,000 NTU
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Minimum range0 – 50 NTU
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InstallationImmersion / flow-through
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