Siemens ECHOMAX Manuel D'application page 4

Unit Repair and Excluded Liability
• The user is responsible for all changes and repairs made to the device by the user or
by the user's agent.
• All new components are to be provided by Siemens Milltronics Process Instruments
Inc.
• Restrict repair to faulty components only.
• Do not reuse faulty component
Introduction
The Echomax series and ST-H series transducers use ultrasonic technology to monitor
level changes in a wide range of liquids and solids applications. These transducers are
resistant to steam and harsh chemicals, and can be installed without flange mounting.
Siemens Milltronics transducers emit acoustic
pulses perpendicular to the transducer face.
The level controller measures the time
between the pulse and its reflection (echo) to
calculate distance.
Maximum power is radiated in a line referred
to as the axis of transmission. Where power is
reduced by half (– 3 dB), a conical beam
centered about the axis of transmission is
established. The diametric measurement of
this cone in degrees defines the beam angle.
The transducer's internal temperature sensor
reports the ambient temperature to the
controller. The connection is transparent in
that both the ultrasonic and temperature
components of the transducer use the same
leads. This ensures that the transceiver can
automatically compensate so the speed of
sound is constant for varying temperatures.
Page EN-2 Transducers – APPLICATION MANUAL
transducer
transducer face
–3 db
boundary
axis of
transmission,
perpendicular
to transducer
face
7ML19985HV61