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Aperçu
La sonde CS526 mesure le pH à l'aide de la technologie la plus récente ISFET. Il n'y a pas d'ampoule de verre à briser, ce qui rend la sonde plus sûre et plus robuste. La sonde est facile à nettoyer et peut être stockée au sec.
Lire la suiteAvantages et caractéristiques
- Elément capteur de pH ISFET innovant
- Facile à nettoyer
- Plus robuste que les sondes de pH à électrode de verre traditionnelles
- Conçu et fabriqué dans des conditions rigoureuses de contrôle de la qualité dans un environnement ISO 9001
- Conforme aux normes CE
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Description technique
Le pH mètre CS526 utilise le capteur de haute technologie SENTRON, le semi - conducteur de type "Ion Sensitive Field Effect Transistor (ISFET)" est un élément sensible au pH incluant du chlorure d'argent/d'argent - le système de référence est le chlorure de potassium. La technologie ISFET est la technologie la plus performante disponible aujourd’hui pour la mesure du pH. Cette technologie réduit considérablement le nombre d'erreurs acides ou alcalines dans des conditions extrêmes de pH. Il permet au CS526 de contrôler le pH dans des liquides contenant des matières solides, des produits chimiques agressifs ou des matières biologiques, qui boucheraient ou contaminerai ent la jonction des sondes de pH utilisant des électrodes traditionnelles en verre.
La conception rustique de la sonde CS526 lui permet d'être utilisée pour à peu près n'importe quelle application contrôlant le pH liquide, du laboratoire aux applications en milieu hostile sur le terrain. L'électronique de la sonde est protégée par une enveloppe en PEEK très résistante. L’élimination de l’électrode en verre évite le risque de briser l’électrode, faisant de la CS526 une sonde plus durable et plus sûre à utiliser.
Ce capteur requiert une sortie 5V sur la centrale de mesure pour son alimentation.
Spécifications
| pH Range | 2 à 12 |
| Alimentation requise | 5 Vcc |
| Consommation en courant | 15 mA (maximum) |
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| Précision | ±0,2 pH (de 10°C à 40°C) |
| Température de fonctionnement | 10°C à 40°C |
| Dérive sur 24 heures | < 0,15 pH (après 15 minutes baignée dans un pH 7 à 25°C) |
| Pression d’eau admise | 0 à 700 kPa (0 à 101.5 psi) |
| Type de câble | Three-twisted pair, 24 AWG cable with Santoprene jacket |
| Matière du capteur | Polyétheréthercétone (PEEK) |
| Longueur de câble maximum | 100 m |
| Diamètre | 16 mm |
| Longueur | 102 mm |
| Poids | 318 g avec 3.05-m de câble |
Compatibilité
Documents à télécharger
Conformité
FAQ
Nombre de FAQ au sujet de(s) CS526: 13
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Les centrales d'acquisition de données CR300 et CR310 ne prennent pas en charge le TTL, ce que le capteur CS526 utilise. Un convertisseur TTL vers RS-232 (fourni par l'utilisateur) pourrait cependant être utilisé.
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PolyEtherEtherKetone (PEEK) is a plastic material that has very good thermal stability and chemical resistance properties. This material was chosen for use in the manufacture of the CS526-L because of its natural resistance to organic acids (acetic, carbonic, citric, tartaric, etc.) and its hydrolysis resistance to fresh and saltwater.
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An ISFET chip pH sensor has three main components:
- ISFET chip—The ISFET chip is made of durable plastic and contains three electrodes: the source, the drain, and the gate. The gate is the ISFET chip’s only electrode that comes in contact with the sample solution.
- Reference electrode—Inside the reference electrode’s membrane, there is a silver wire element submersed in an electrolyte solution. The reference electrode, as a whole, is submersed in the sample solution.
- Reference junction—The reference junction is located at the end of the reference electrode by the sample solution. It interacts with both the reference electrode’s electrolyte solution and the sample solution to complete the electrical circuit.
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The source and the drain are two of the three electrodes contained within the ISFET chip, and they behave in much the same way. The third electrode in the ISFET chip, the gate, has an electrical field that influences the current that flows between the source and the drain. The electrical potential in the ISFET pH sensor is measured between the reference electrode and the source.
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In an ISFET chip pH sensor, the chemical coating on the gate electrode can vary depending on the model and manufacturer of the pH sensor. Depending on which chemical coating is used and what elements are present in the sample solution, there may be some ion interference.
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The CS526-L pH sensor uses an ISFET chip instead of pH-sensitive glass, which is used for many other pH sensors. The ISFET chip is a transistor coated with a chemically sensitive material. One of the ISFET chip’s electrodes (the gate) and the reference electrode are submersed in the same sample solution. A circuit path is established between the two electrodes. The difference in electrical potential between the two electrodes is directly proportional to the sample solution’s pH. Thus, by measuring the electrical potential, the pH is measured.
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Silver is the best electrical conductor of all the metals because it has the lowest electrical resistance. The silver wire, coated in silver chloride, is relatively insensitive to changes in temperature.
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A reference electrode can become contaminated when poisoning ions such as lead, iron, chrome, cyanide, or sulfide enter the reference electrode and react either with the silver wire or with the electrolyte solution.
The contamination may not become apparent until the silver-chloride coating is completely dissolved and the electrical potential from the reference electrode has changed greatly. If this occurs, the reference electrode must be replaced.
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Cleaning and/or calibration may be required when the measurements are scattered, drifting occurs, or there is physical evidence of fouling. Measurements for pH must be monitored regularly to check for scattering. However, just because the results are scattered does not necessarily indicate the need for an adjustment. For example, there may be a change in the water source that causes the scattering. As a sensor ages, however, the scattering of the measured values tends to increase.
To check the performance of a pH sensor, use it to measure a buffer solution in the correct range. If the value returned is within the specified range, the sensor does not need to be calibrated.
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In the event that both alkaline and acidic sample solutions are measured using a single pH sensor, a multipoint calibration is done using three buffer solutions. As in the two-point calibration, the first buffer solution has a 7.0 pH. The second buffer solution should be near in pH value to either the acidic or alkaline sample solution, and the third buffer solution should be near in pH value to the other.