{"product_id":"hanna-instruments-hi-1131s-refillable-combination-ph-electrode-with-screw-cap-connector","title":"Hanna Instruments HI-1131S Refillable combination pH electrode with screw cap connector","description":"\u003cp\u003ePerfect for any laboratory use, the HI-1131S is a glass-bodied combination pH electrode with a screw cap connector.\u003c\/p\u003e\u003cp\u003eWith a double junction design and the ability to change out contaminated electrolyte, this economical pH electrode ensures great results in your laboratory, clean water testing and beer production.\u003c\/p\u003e \u003cul\u003e \u003cli\u003eHigh temperature glass can stand up to the effects of elevated temperatures leading to longer probe life\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eThe HI-1131S uses high temperature (HT) glass, spherical bulb, glass body, single ceramic reference, double junction and is refillable with 3.5M KCl.\u003c\/p\u003e \u003ch3\u003eHigh Temperature 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 HT glass is around 400 megaohms at 25°C. As the HI-1131S is used at elevated temperatures, the resistance decreases to approach that of GP glass. The HI-1131S is suitable to use with samples that measure from 0 to 100°C.\u003c\/p\u003e \u003ch3\u003eSpherical Glass Tip\u003c\/h3\u003e \u003cp\u003eThe spherical bulb is for general purpose use. Other tip shapes include conic for penetration and flat tip for surface measurements.\u003c\/p\u003e \u003ch3\u003eGlass Body\u003c\/h3\u003e \u003cp\u003eThe glass body is ideal for laboratory use. The glass is resistant to many harsh chemicals and is easily cleaned. The glass body also allows for a fast transfer of heat to the internal reference electrolyte. The mV generated by the reference cell is temperature dependent. The faster the electrode reaches equilibrium, the steadier the reference potential.\u003c\/p\u003e \u003ch3\u003eSingle Ceramic Double Junction Reference\u003c\/h3\u003e \u003cp\u003eThe HI-1131S is a double junction design. pH electrodes are available as single junction or double junction. See below for a complete description of the differences. The junction also known as a salt bridge is necessary component of the electrical circuit. The movement of ions must flow through the junction for a steady reading. The outer reference has a single ceramic reference. The ceramic is a porous material that is easily fused with the glass body and has a similar expansion coefficient. A single ceramic junction has a flow rate of 15-20 μL\/hour. Other junction types are available with higher flow rates and made with different materials.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eReference\u003c\/td\u003e\n\u003ctd\u003esingle, Ag\/AgCl\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eJunction\/Flow Rate\u003c\/td\u003e\n\u003ctd\u003eceramic, single \/ 15-20 µL\/h\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eElectrolyte\u003c\/td\u003e\n\u003ctd\u003eKCl 3.5M + AgCl\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax Pressure\u003c\/td\u003e\n\u003ctd\u003e0.1 bar\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRange\u003c\/td\u003e\n\u003ctd\u003epH: 0 to 13\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRecommendedOperating Temp.\u003c\/td\u003e\n\u003ctd\u003e0 to 100°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTip\/Shape\u003c\/td\u003e\n\u003ctd\u003espheric (dia: 9.5 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperature Sensor\u003c\/td\u003e\n\u003ctd\u003eno\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAmplifier\u003c\/td\u003e\n\u003ctd\u003eno\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody Material\u003c\/td\u003e\n\u003ctd\u003eglass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCable\u003c\/td\u003e\n\u003ctd\u003ecoaxial; 1 m (3.3’)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnection\u003c\/td\u003e\n\u003ctd\u003eScrew cap\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e","brand":"Hanna Instruments","offers":[{"title":"Default Title","offer_id":57640054260085,"sku":"HI-1131S","price":191.61,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0574\/5511\/6439\/files\/hi-1131s-refillable-combination-ph-electrode-with-screw-cap-connector.jpg?v=1791579824","url":"https:\/\/testallwater.co.uk\/products\/hanna-instruments-hi-1131s-refillable-combination-ph-electrode-with-screw-cap-connector","provider":"Test All Water","version":"1.0","type":"link"}