General Guidelines - Siemens ST-H Manual De Operación

Introduction
The ST-H transducer operates with Siemens Milltronics
ultrasonic level monitoring products.
The transducer converts the electrical energy of the transmit
pulse from the transceiver into acoustical energy. It then
converts the acoustical energy of the echo back into
electrical energy for the controller.
The transducer face emits acoustical energy that radiates
outward, decreasing in amplitude at a rate inversely
proportional to the square of the distance. Maximum power
radiates perpendicularly from the transducer face on the
axis of transmission. Where power is reduced by half (– 3
dB), a conical boundary centered around the axis of
transmission defines the sound beam, the diameter of which
is the beam angle.
The ST-H transducers have an integrated temperature sensor that reports the air temperature
at the transducer to the controller.

General Guidelines

WARNING:
compatibility (or inertness) for general purposes. For exposure to specific
environments, check with chemical compatibility charts before installing.
EC-Type Examination Certificate BAS99ATEX2298X
1. The equipment may be used with flammable gases and vapors with the Apparatus Group
II and with Temperature class T5.
2. The equipment is certified for use in an ambient temperature range of -20 °C to 60 °C
3. The equipment has not been assessed as a safety related device as referred to by EC
Directive 94/9/EC Annex II, clause 1.5.
4. The certificate has a 'X' suffix, which indicates that special conditions of installation and
use apply. Those installing or inspecting this equipment must have access to the contents
of the certificate.
5. The transducer has no internal fuse or any other components which will guarantee its
suitability for connection to a prospective short circuit current of 4000A. The transducer
must be supplied from apparatus suitable for connection to a supply having a prospective
short circuit not exceeding 4000A. This condition is met by Siemens Milltronics
transceivers.
6. Installation and inspection of this equipment shall be carried out by suitably trained
personnel in accordance to the applicable code of practice (EN 60079-14 and EN 60079-17
within Europe).
Page EN-2
Materials of construction are chosen based on their chemical
ST-H Transducer – OPERATION MANUAL
transducer
transducer face
–3db
boundary
axis of
transmission,
perpendicular to
transducer face
.
7ML19985QK81