Det-Tronics ATX10 Transmitter SAFETY MANUAL - Manual (Page 2)

1.2 95-8658 2
DESIGN
The FlexSonic Acoustic Detector recognizes the unique
ultrasonic frequency content of events such as gas
leaks.
The FlexSonic Acoustic Detector consists of one Model
AC100 Acoustic Sensor connected to one Model ATX10
Transmitter. The device communicates function/status
via a 4-20 mA output signal with HART communication.
The FlexSonic Acoustic Detector is compatible with the
FlexVu ® Model UD10 Universal Display, as well as other
devices that are able to monitor a 4-20 mA dc signal. All
alarm functions are provided by the monitoring device.
The FlexSonic Acoustic Detector is classified as Type
B smart element according to IEC61508. The device
contains self-diagnostics and sends the current output
to a specified failure state upon internal detection of a
failure (see instruction manual 95-8657 for details).
Safety-Certification of the FlexSonic Acoustic Detector
includes:
• the 4-20 mA output of the ATX10 Transmitter in
combination with the AC100 Acoustic Sensor.
Non-Interfering Interfaces
Safety Certification of the FlexSonic Acoustic Detector
includes the following non-interfering interfaces:
- Magnetic switches
- HART communication
– RS485 communication
– LEDs
– SD card
The HART communication protocol is non-interfering
and may be used for diagnostics within the SIL 2
safety loop in the Safety operation mode. Diagnostics
are defined as read only information. Local HART
communication with the FlexSonic Acoustic Detector
using a handheld HART field communicator, or
AMS program connected to the 4-20 mA output, is
acceptable. Proper analog signal loop resistance must
be installed as documented in the instruction manual to
enable local HART communication.
RS485 communication is used in conjunction with
the Acoustic Inspector software package - consult
manufacturer or instruction manual for details.
VALID INPUT RANGE
FlexSonic Acoustic Detector fault and alarm
annunciation is provided on the 4-20 mA signal output
loop by signaling to a specific mA current output level.
The user SIF must monitor the 4-20 mA output for fault
and alarm conditions and take appropriate actions
according to the specific requirements of the SIF. The
receiving device must be programmed to indicate a
fault condition when current levels reach under-current
of 3.6 mA or less or over-current of 21 mA or more.
NOTE
The FlexSonic Acoustic Detector analog signal
is not safety-rated during detector warm-up.
Alternative means should be used at the job site
to ensure facility safety during these activities.
DIAGNoSTIC RESPoNSE TIME
The FlexSonic Acoustic Detector will perform all critical
diagnostic functions within one hour, worst case
diagnostic detection time.
The Acoustic Detector will annunciate a fault if the
safety response time is delayed by greater than 1
second due to SD card (optional) operations. This fault
is not applicable if the SD card option is disabled.
ACoUSTIC INTEGRITY TEST
The FlexSonic Acoustic Detector periodic Acoustic
Integrity Check (AIC) is designed to generate a fault
when the unit’s acoustic response has been significantly
reduced. The unit continues to detect during an AIC
fault, however, the detection capability may be reduced.
CERTIFICATIoN
The FlexSonic Acoustic Detector Safety-Certified
version is certified SIL 2 Capable by exida ® to
IEC61508 for single input use in low demand, SIL 2
Safety Instrumented Systems.
SAFETY-CERTIFIED PRoDUCT IDENTIFICATIoN
Safety Certification of all FlexSonic Acoustic Detector
models meeting SIL 2 safety standards is clearly
identified on the product label.