Ordering Information Model 4690/ Turbidity system Transmitter type 1 Wall-/ Pipe-mount (gland fittings) Voltage 2 230 V AC Communications and IO 1 Standard (1 analog output) Sensor type 1 Flow-through system (ISO 7027 compliant) Sensor range 3 0 to 400 NTU Secondary dry calibration 3 High range (50 … 100 NTU) Sensor cable length 3 10 m (32.8 ft) Manual 1 English /STD