Product Overview

• HI4000-47 is a set of pH 4 and pH 7 buffer sachets (each buffer includes 10 sachets). These buffer sachets contain chloride ions to allow internal electrode inspection of ammonia and carbon dioxide ion-selective electrodes. Both the ammonia and carbon dioxide sensors are gas-sensing, combination ion-selective electrodes (ISE) that contain an internal glass pH element for determining ammonia and carbon dioxide concentrations, respectively. Internal electrode inspection using HI4000-47 buffer ensures that the pH element is in working condition, thereby enabling accurate ISE measurements.

• Prepared with high-purity chemicals

• Pre-measured buffer sachets for ease of use

• Clearly marked lot number and expiration date

• HI4000-47 is a package containing pH 4 and pH 7 buffer sachets, which include chloride ions and two plastic beakers. The special pH 4 and pH 7 buffers have a chloride background to verify the internal pH glass assembly housed within the ammonia and carbon dioxide gas-sensing ISE.

• Before first assembling the ammonia or carbon dioxide ISE, or before reactivating after storage, the internal glass assembly should be conditioned and tested as a pH electrode. The pH buffer sachets can be added to 50 mL of deionized water or distilled water, and the sensor assembly carefully immersed in the solution. When the mV measurements in each buffer solution stabilize and are recorded, the mV difference can be calculated. For temperatures between 20 and 25°C, a calculated mV difference equal to or greater than 160 mV is acceptable.