Electronic Fish Counting System Smith-Root SR-1101 , 20 Counts Per Second

Smith-Root SR-1101 Fish Counter, 20 Counts Per Second Used, in very good condition, powers on, no further test done. Please see pictures. Principle of Operation The SR-1101 uses a counting tunnel with metal rings, flush-mounted, on the inner surface. The passage of fish through the counting tunnel causes water conductivity changes. Special logic in the SR-1101 allows it to discriminate between upstream and downstream fish passages. Two six-digit liquid crystal displays (LCD) tally completed fish passages. The displays are easy to read even in direct sunlight. Type of detection: Potentiometric bridge Water conductivity range: 20 to 5000 microSiemens/cc Count sensitivity: 1% tunnel unbalance, minimum Count rate: 5 per second Count capacity/channel: 999,999 six digit LCD Counting mode: Directional Type of tunnel required: Three element potentiometric Auto balance range: 5% tunnel unbalance Tunnel diameters: 1" to 12" standard Tunnel length:diameter: 3:1 minimum Smallest fish detected: Length equal to tunnel diameter Data output signals: 0 to 12V pulse for each count Power requirement: 120 VAC 60 Hz or 12 VDC Size: 13.5"W X 6.25"D x 6.75"H