ADS Environmental Services Model 4000 530017 A0 - Manual (Page 38)

Monitor and Sensor Installation 3-15
Mounting the ultrasonic depth sensor to the mounting plate on the ring
2. Verify that the ultrasonic depth sensor mounts to the ring at the
crown of the pipe.
Mounting the Doppler Velocity Sensor
Mount the Doppler velocity sensor to the ring in the following way:
1. Use two M-3 × 10 mm stainless steel screws (do not substitute
any other screws) to mount the sensor at the bottom of the ring
opposite the ultrasonic depth sensor with the beveled edge of
the sensor facing upstream.
Mounting the Doppler velocity sensor to the ring