{"product_id":"hanna-instruments-hi-72911d-ph-electrode-for-cooling-towers-and-boilers-din-connector","title":"Hanna Instruments HI-72911D pH Electrode for Cooling Towers and Boilers, DIN connector","description":"\u003cp\u003eSpecial applications pH electrode with a PTFE (PolyTetraFluoro-Ethylene) junction, 7-pin DIN* connector and 1 m cable, for cooling towers and boilers.\u003c\/p\u003e \u003cp\u003e\u003ci\u003e*To be used with HI-99141.\u003c\/i\u003e\u003c\/p\u003e\u003cp\u003eThe HI-72911D is a pH electrode with titanium body for cooling towers and boilers. This electrode is recommended for use with the HI-99141 pH meter. The HI-72911D uses general purpose (GP) glass, flat tip bulb, titanium body, and PTFE junction with polymer electrolyte.\u003c\/p\u003e \u003ch3\u003eGeneral Purpose Glass Formulation\u003c\/h3\u003e \u003cp\u003eThe measurement of pH at very high temperatures is detrimental to the sensitive glass bulb and will shorten the life of it. A pH electrode with general purpose (GP) glass will have a resistance of 100 megaohms at 25°C while the resistance of LT glass is around 50 megaohms at 25°C. As the temperature of the glass decreases in the sample, the resistance of the LT glass will approach that of GP glass. If using GP glass, the resistance would increase above the optimum range, resulting in increased impedance and ultimately affecting the measurement. The HI-72911D is suitable to use with samples that measure from 0 to 80°C.\u003c\/p\u003e \u003ch3\u003eFlat Tip Bulb\u003c\/h3\u003e \u003cp\u003eThe recessed flat tip bulb of the HI-72911D is easy to clean and prevents solids in solutions from collecting on the sensor. Other tip shapes include conic for penetration and spheric for aqueous measurements.\u003c\/p\u003e \u003ch3\u003eTitanium Body\u003c\/h3\u003e \u003cp\u003eA titanium body increases immunity to electrostatic and magnetic fields. It also allows for strong corrosion resistance, even in seawater.\u003c\/p\u003e \u003ch3\u003eMatching Pin\u003c\/h3\u003e \u003cp\u003eA matching pin is a differential measurement technique used to eliminate ground loops and common mode perturbations for the measurement system. In a system without a matching pin, electrical currents in the sample can affect the reference half cell voltage that is connected via the liquid junction with the sample. In this case, the reference electrode picks up the electromagnetic fields and the measurement of the pH is altered. The matching pin isolates these current\/magnetic fields from the reference electrode. The HI-72911D titanium body serves as a matching pin for safe precise pH measurements.\u003c\/p\u003e \u003ch3\u003ePTFE Junction\u003c\/h3\u003e \u003cp\u003ePorous polytetrafluoroethylene (PTFE) is a hydrophobic material that is available with different porosities. This type of junction is often used on electrodes with polymer electrolytes. Because of its chemical advantages, PTFE is widely used in industrial applications.\u003c\/p\u003e \u003ch3\u003eDIN Connector\u003c\/h3\u003e \u003cp\u003eThe HI-72911D uses a DIN connector. This type of connector is generally proprietary to the meters they are supplied with and may not be interchangeable. The HI-72911D is designed for use with Hanna’s HI-99141 pH meter. Other types of connectors include BNC, screw type, T-type, and 3.5mm to name a few.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eReference\u003c\/td\u003e\n\u003ctd\u003eDouble, Ag\/AgCl\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eJunction\u003c\/td\u003e\n\u003ctd\u003ePTFE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnector\u003c\/td\u003e\n\u003ctd\u003eDIN\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eElectrolyte\u003c\/td\u003e\n\u003ctd\u003ePolymer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax Pressure\u003c\/td\u003e\n\u003ctd\u003e3 bar\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRange\u003c\/td\u003e\n\u003ctd\u003e0 to 12 pH; @ 0 to 80°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTip Shape\u003c\/td\u003e\n\u003ctd\u003eFlat\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperature Sensor\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAmplifier\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody Material\u003c\/td\u003e\n\u003ctd\u003eTitanium body working as matching pin\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCable\u003c\/td\u003e\n\u003ctd\u003e7-pole; 1 m (3.3')\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRecommended Use\u003c\/td\u003e\n\u003ctd\u003eCooling towers, boilers\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e","brand":"Hanna Instruments","offers":[{"title":"Default Title","offer_id":57640079950197,"sku":"HI-72911D","price":222.3,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0574\/5511\/6439\/files\/special-applications-specific-electrodes-for-specific-analysis.jpg?v=1791580756","url":"https:\/\/testallwater.co.uk\/products\/hanna-instruments-hi-72911d-ph-electrode-for-cooling-towers-and-boilers-din-connector","provider":"Test All Water","version":"1.0","type":"link"}