| 摘要 |
The present invention is concerned with improvements in sensing and measuring devices, more particularly for use in combination with, an ion-selective electrode. The apparatus comprises a signal processing unit (1), connector means (2) for connection of the signal processing unit to an ion sensitive electrode (3) capable of response to the presence of an analyte and to a reference electrode (4). The apparatus further comprises output means (5), capable of indicating the presence and/or concentration of the analyte. The signal processing unit (1) comprises a replaceable or reprogrammable memory device (6) for the storage of a look-up table. The memory device (6) is an EPROM for interchangeable location in a socket (7) connected electrically to the signal processing unit (1). The EPROM contains a look-up table which will be specific for the electrodes being used. In the present instance, with an ammonium ISE and a double-junction reference electrode, the values range from -15 mV at 0.1 ppm (as Nitrogen) to +45 mV at 1000 ppm. |
