Specifications

BATS AND PORTABLE BATS PRINCIPLES OF OPERATION
4-6
4.1 HYDROPHONE
Model 4213C-B Hydrophone Assembly
The hydrophone assembly consists of the hydrophone and the pressure case/electronics. In the
hydrophone, the three receiving elements and the transmitting element are potted and attached to
the PVC base, and connected to the electronics. In the pressure case/electronics package, each of
the three elements feeds its own Amplifier on the Amplifier Board. A precision temperature sensor,
located on the Amplifier Board, provides an analog signal which is sent to the Transceiver. The me-
dium frequency unit is calibrated from 17 to 30kHz and the Low is calibrated from 8 to 16kHz.
Model 4211A-B Hydrophone
For existing Model 4630 Gate Valve installations, the Model 4211A Hydrophone can also be used to
interface to the BATS. The mounting/mechanical dimensions are the same as the 4211B but the
connector has been change to the 4213C-B type.