—A B B M E A S U R E M E N T & A N A LY T I C S | I N F O R M AT I O N | I N F 1 1 /0 6 6 - E N R E V. A4690 seriesTurbidity systems4670 to 4690 turbidity system upgrade1 IntroductionThis publication details the upgrade of a 4670 turbidity systemto a 4690 system (for use with 7998 sensors). The system isupgraded by replacing the EPROM and the procedure must becarried out by a trained technician.The replacement EPROM kit options are shown in Table 1:Description Part No. QtyStandard (1 analog output)(containing EPROM part no. 46903000)7998 040 1Additional analog output(containing EPROM part no. 46903001)7998 041 1Modbus®(containing EPROM part no. 46903002)7998 042 1Modbus® + Net Tap(containing EPROM part no. 46903003)7998 043 1This publication (supplied with each kit) –4670 to 4690 turbidity system upgradeINF11/066–EN 1Table 1 EPROM kit optionsModbus is a registered trademark of the Modbus-IDA organization2 Tools required• No. 2 Pozidriv screwdriver• EPROM extraction tool• EPROM insertion tool