Thermo Fisher, 951204, Orion™ Gas-Sensing ISE membranes

The Orion loose-membrane replacement pack supports routine service of standard ammonia gas-sensing ion-selective electrodes. A membrane forms the selective interface in the electrode assembly, allowing ammonia measurement while separating the internal sensing system from the sample matrix. Worn, damaged or contaminated membranes can cause unstable response and poor repeatability, so replacement forms part of electrode care. The 20 loose membranes are intended for standard Orion ammonia electrode models 9512 and 9512BNWP. They are not the bonded-membrane set or the replacement membranes specified for the high-performance ammonia electrode. After assembly, condition and calibrate the electrode as required by the electrode instructions.