Instruction manual

Page 19
ATEX
For EEx m (Zone 1) applications a transducer certified to Sira
02ATEX5104X is used, and must be supplied via a 4000A breaking fuse,
which is fitted as standard to the Ultra3.
For EEx ia (Zone 0) a transducer certified to Sira 02ATEX2103X is used,
which must be connected to the Ultra 3 via an external Zener barrier.
See transducer label for certification details.
Important Information
Please note that if the output of the ultrasonic transducers used with
the Ultra 3 are capable of emitting sound pressure levels in excess of
85dBA (above a reference sound pressure level of 20µPA), then the
Ultra 3 must be located remote from the transducer such that a sound
pressure level of 85dBA is not exceeded when standing at the Ultra 3
in the operators position.
Relay Outputs
The three relays can be programmed for a variety of alarms, pump control,
or other process functions. The relay contacts are all rated at 5A at 115V
AC.
Wiring should be completed by using suitable cable, to meet the specified
115V AC 5A contact rating, up to maximum size of 14AWG.
All connections should be such that the short circuit capacity of the circuits
to which they are connected, is limited by fuses rated so that they do not
exceed the relay rating.
Current Output
This is an isolated (floating) mA output, of 4 - 20mA or 0 - 20mA, and the
load should not exceed 500 Ω.
RS232 Serial Interface
If required, you can connect to the serial interface, to operate your Ultra 3
remotely.