{"product_id":"hanna-instruments-hi-4000-51-gas-sensor-replacement-ph","title":"Hanna Instruments HI-4000-51 Gas Sensor Replacement pH","description":"\u003cp\u003eGas sensor replacement pH.\u003c\/p\u003e\u003cp\u003eThe HI-4000-51 is a gas sensor replacement pH for ammonia sensor.\u003c\/p\u003e \u003ch3\u003eHow it works\u003c\/h3\u003e \u003cp\u003eA gas sensor works due to the partial pressure of the measured gas in solution. The dissolved gas in the sample diffuses into the membrane and changes the pH in a thin film of non-buffered electrolyte on the surface of the internal pH sensor. Diffusion continues until the partial pressure of the sample and the thin film of electrolyte are the same. The pH change is proportional to the concentration of dissolved gas in the sample solution.\u003c\/p\u003e","brand":"Hanna Instruments","offers":[{"title":"Default Title","offer_id":57640061239669,"sku":"HI-4000-51","price":553.85,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0574\/5511\/6439\/files\/gas-sensor-replacement-ph.jpg?v=1791580098","url":"https:\/\/testallwater.co.uk\/products\/hanna-instruments-hi-4000-51-gas-sensor-replacement-ph","provider":"Test All Water","version":"1.0","type":"link"}