Georg Fischer 5908.802 3-9950-2 Signet 9950 Dual Channel Transmitter. The 9950 is packed full of standard features and options, allowing it to perform with greater flexibility than any previous Signet instrument. By using a state-of-the-art dot matrix display, it offers easy viewing and simplified menus. Combine this with the ability to be AC or DC powered and the fact that the 9950 accepts frequency, digital (S3L) and binary inputs, along with an on-board clock and calendar allows for countless new application opportunities.