Det-Tronics SAFETY MANUAL FlexSonic™ Acoustic Detector AC100 Sensor ATX10 Transmitter
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FlexSonic™ Acoustic Detector
SAFETY CERTIFIED Flexsonic acoustic
This manual addresses the specific requirements
and recommendations applicable to the proper
installation, operation, and maintenance of all SafetyCertified (SIL‑Certified) FlexSonic™ Acoustic Detector
product versions. For complete information regarding
system overview, performance, installation, operation,
maintenance and specifications of the FlexSonic
Acoustic Detector, refer to instruction manual 95-8657.
QUALITY POLICY STATEMENT
All quality assurance control measures necessary for
safety management as specified in IEC 61508 Part 1
have been implemented. The quality management
system of Det-Tronics is based on the requirements
of EN ISO 9001 and ANSI/ASQC Q9001 through the
application of the United Technologies Company
Achieving Competitive Excellence (ACE) program. In
addition, the Quality Management System complies
with the European ATEX Directive, EN ISO/IEC 8007934, and supervised testing requirements per ISO 17025.
Procedures and instructions in this section may
require special precautions to ensure the safety of
personnel performing the operations. Information that
raises potential safety issues is indicated by the word
“Warning”. Always read and understand these safety
The FlexSonic Acoustic Detector is intended for
use in hazardous environments that may include
explosive levels of flammable gases and vapors.
This product must be properly installed, operated
and maintained. Improper installation or use
could result in an explosion or fire resulting in
death or serious injury.
• Do not remove the cover of a junction box in
explosive environments when device power is
on and circuits are live.
• Device must be properly installed to meet
hazardous area explosion-proof/non‑incendive
and intrinsic safety requirements.
1.2 © Detector Electronics Corporation 2013
VALID INPUT RANGE
The FlexSonic Acoustic Detector recognizes the unique
ultrasonic frequency content of events such as gas
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.
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 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.
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).
DIAGNOSTIC RESPONSE TIME
The FlexSonic Acoustic Detector will perform all critical
diagnostic functions within one hour, worst case
diagnostic detection time.
Safety-Certification of the FlexSonic Acoustic Detector
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.
• the 4-20 mA output of the ATX10 Transmitter in
combination with the AC100 Acoustic Sensor.
Safety Certification of the FlexSonic Acoustic Detector
includes the following non-interfering interfaces:
- Magnetic switches
- HART communication
– RS485 communication
– SD card
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.
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.
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.
RS485 communication is used in conjunction with
the Acoustic Inspector software package - consult
manufacturer or instruction manual for details.
General Application Considerations
– The user shall understand the effects of and limit the
number of devices that are voted to declare alarm.
– The user shall understand the effects of the time
delay parameter and limit the length so that desired
SIF hazard detection is achieved. Alarm time delay
should be sufficient to prevent false alarms from
friendly or known gas releases (e.g. intermediate
process venting normal to SIS operation).
For complete information regarding performance,
specifications of the FlexSonic Acoustic Detector,
refer to instruction manual 95‑8657.
No special or additional detector installation
requirements exist above and beyond the standard
installation practices documented in the FlexSonic
Acoustic Detector instruction manual.
START-UP AND COMMISSIONING
Environmental operating specifications for the FlexSonic
Acoustic Detector are applicable as published in the
general specifications section in the instruction manual.
The device shall not be exposed to environments that
exceed its specified environmental limits.
The Safety Certified FlexSonic Acoustic Detector
can be commissioned by any qualified person with
knowledge of acoustic detection instruments and the
configuration device being used.
The FlexSonic Acoustic Detector operating power
distribution system should be designed and installed so
the terminal voltage does not drop below 9 Vdc when
measured at any specific location. The external system
providing power to the FlexSonic Acoustic Detector
must have over-voltage protection that ensures supply
voltage does not exceed 30 Vdc.
Refer to the Installation section provided in the FlexSonic
Acoustic Detector instruction manual for details.
A HART handheld or RS485 communication device
can be used to monitor internal status or to modify the
factory settings of the FlexSonic Acoustic Detector.
Refer to the FlexSonic Acoustic Detector HART
Addendum (number 95-8698) for guidance on using
The user shall correctly install all shielding and
grounding for device and ensure that maximum cable
lengths are not exceeded.
All safety functions of the FlexSonic Acoustic
Detector are active within 30 seconds of powerup without any user action required.
Alternate protection measures must be used as needed
while modifications to safety related parameters are
being made, including while the device is in learn mode.
Cloned configuration data as well as learn data should
only be used at the exact physical location that it was
Common Misuse Scenarios
Refer to the Installation, General Application Information,
and Maintenance sections of the instruction manual for
information on avoidance and resolution of common
misuse scenarios. No special application restrictions
are necessary to meet the safety certification
The device must be powered down during SD card
removal and installation.
While in the process of calibrating the 4-20 mA output,
the detector is not able to signal an alarm. During this
time, the device is not performing its safety function.
If the user suspects that damage or misuse has
occurred to the FlexSonic Acoustic Detector, a
full proof test shall be performed.
The periodic AIC frequency / fail count combination
must allow for fault indication within 1 hour or less (e.g.
a configuration of 10 minute intervals and consecutive
fail count of 3 will cause a fault in 30 minutes).
Personnel performing proof test procedures shall be
competent to perform the task. All proof test results
must be recorded and analyzed. Any corrective actions
taken must be documented in the event that an error is
found in the safety functionality. The proof tests must
be performed prior to commissioning the device and at
least as often as specified in Table 1.
Prior to device configuration all alarm outputs
must be bypassed. The device is not safety
certified during configuration change activities.
All configuration changes to the FlexSonic
Acoustic Detector (including any changes via
SD card operations) must be verified by the user
via a proof test, power cycle and re-check of
settings, or other appropriate method. The safety
functionality must be validated prior to reliance
on the product for safety protection.
Failure to perform the specified testing and
inspection may lower or void the SIL rating for the
product or system.
Visual Field Inspection Proof test
Upon completion of installation and commissioning, it
is required that the user password-protect the safety
related parameters that are accessible via HART or
RS485 in order to prevent accidental or deliberate
change of configuration data during normal operation.
To password protect the FlexSonic Acoustic Detector,
the user must set the write-protect function to “on” and
enter an 8 character password. The user should check
the write protect status to ensure that it is set to “on”.
Visual inspection of all Safety-Certified FlexSonic
Acoustic Detectors shall be conducted as needed
to confirm that no external blockage of the sensor
cover exists, eg. debris, trash, snow, mud, external
equipment, etc. Corrective action shall include
removal of such impediments should they exist. All
acoustic detectors must be inspected to ensure that
they are capable of providing expected performance
The user will be required to disable write protect prior to
any future configuration changes, and must re‑enable
write protect upon completion of these changes to
ensure that HART and RS485 communication remain
Completion of Visual Field Inspection Proof Test must
be recorded and documented in the SIS logbook.
Response Proof Test
OPERATION, MAINTENANCE, INSPECTION AND
Tools Required: Magnetic tool available from
HART handheld communicator
All normal installation and startup recommendations
as documented in the FlexSonic Acoustic Detector
instruction manual are applicable to the Safety Certified
FlexSonic Acoustic Detector.
The Manual AIC test provides a self check of the
acoustic detector safety function. All acoustic detectors
must be performance tested using the Manual AIC
test procedure and inspected to ensure that they
are capable of providing expected performance and
protection. The Manual AIC test can be initiated and
reset by placing the magnetic tool on the icons on
the ATX10 display, via HART command, or via RS485
Safety-Certified FlexSonic Acoustic Detectors require
proof testing to be performed in all cases.
Table 1—Frequency for Performing Proof Tests
Proof Test Name
Visual Field Inspection Proof Test
As needed, depending on level and type of
Response Proof Test
Any external alarm equipment, systems or
signaling devices that could be automatically
initiated by performing this test must be disabled
or bypassed before performing this test!
Field calibration of the acoustic detector is not
necessary or available.
FAULT/FAILURE ACTION PLAN
In the event that an AIC test does not result in an
acceptable Response Proof Test, then the standard
Maintenance and Device Repair and Return procedures
as listed in the FlexSonic Acoustic Detector instruction
manual must be followed. Any failure to successfully
complete the Response Proof Test must be recorded
and documented in the SIS logbook.
Response Proof Test Sequence
Verification of the LED function is optional as the
LEDs are not part of the safety function.
1. Inhibit alarm and fault response at the control
2. Place the magnet at the ‘TEST’ icon on the ATX10
faceplate for at least 3 seconds or issue an Active
Manual AIC test command via digital communication
(HART or RS485).
Field repair of the FlexSonic Acoustic Detector is
limited to replacement of the sensor cover and/or
foam particulate filter. All other device repairs must be
conducted at the factory. No firmware changes are
permitted or authorized. All failures detected by the
device diagnostics or by the proof tests that cannot
be resolved through the procedures described in
the FAULT/FAILURE ACTION PLAN section must be
reported to the manufacturer.
3. Activation of the Manual AIC test results in a flashing
green LED and an audible tone.
4. Verify correct change of state at the control device:
a successful alarm proof test results in a latched
20 mA output and red alarm LED; an unsuccessful
proof test results in a latched 2 mA output and a
flashing yellow fault LED.
OPERATING, ENVIRONMENTAL, AND
5. Following a Manual AIC test, reset the detector
by placing the magnet at the ‘RESET’ icon on the
ATX10 faceplate for at least 3 seconds, or by issuing
a reset command via digital communication (HART
or RS485). Actuating the Reset command resets
any alarms or faults and places the detector back in
the normal operating mode.
6. Verify that the device returns to a 4 mA output.
The Safety-Certified FlexSonic Acoustic Detector
product versions fully comply with, and must be operated
in accordance with the functional, environmental, and
performance specifications provided in the FlexSonic
Acoustic Detector instruction manual. A 24 hour mean
time to repair should be assumed for safety availability
7. Re-activate alarm and fault response at the control
Refer to “Ordering Information” in the FlexSonic Acoustic
Detector instruction manual. Safety Certification is
based on a sufficient number of spares to achieve a 24
hour mean time to repair.
Completion of the Response Proof Test must be
recorded and documented in the SIS logbook.
Any external alarm equipment, systems or
signaling devices that were disabled must be
re-activated at the conclusion of proof testing
The use of the Manual AIC test shall be limited to
maintenance and proof test activities.
CERTIFICATION AND FAILURE RATE DATA
All Safety-Certified FlexSonic Acoustic Detectors are
certified compliant to:
FM, CSA, ATEX, IECEx, CE, and others.
Refer to the FlexSonic Acoustic Detector Instruction
Manual for details.
For complete information regarding performance,
installation, operation, maintenance and specifications
of the FlexSonic Acoustic Detector, refer to instruction
Low Demand Mode
TERMS AND DEFINITIONS
Type B Element
Systematic Capability: SIL 2 certified
PFDavg should be calculated for any safety instrumented
function using the FlexSonic Acoustic Detector. (Refer
to FMEDA report for necessary information, including
±10% of applied acoustic leak
Safety Response Time: Refer to the FlexSonic
Acoustic Detector instruction
manual for details.
10 years, based on
All failure rate data for SIL verification is in the FMEDA
report, which is available upon request.
Asset Management System
Failure Mode Effects and Diagnostics
Highway Addressable Remote
Hardware Fault Tolerance
Probability of Failure on Demand
(Probability of Dangerous Failure)
Average Probability of Failure on
Safe Failure Fraction
Safety Instrumented Function
Safety Integrity Level
Safety Instrumented System
Acoustic Sensor (contains microphone,
AIC acoustic source, and associated
Transmitter for acoustic spectrum
analysis and control functions
Consists of one Model AC100 Sensor
and one Model ATX10 Transmitter
UD10 FlexVu® Model UD10 Universal Display
IEC 61508 Failure Rates in FIT1
Acoustic Detector Analog Output (consists of one Model
AC100 Sensor and one Model ATX10 Transmitter)
1 FIT = 1 Failure / 109 Hours
2 It is important to realize that the No Effect failures are no longer included in the Safe Undetected failure category according to IEC 61508,
3 Safe Failure Fraction needs to be calculated on (sub)system level.
Detector Electronics Corporation
ED BY UL A
©Copyright Detector Electronics Corporation 2013. All rights reserved.
Det-Tronics and FlexSonic are registered trademarks or trademarks of
Detector Electronics Corporation in the United States, other countries, or both.
Other company, product, or service names may be trademarks or service
marks of others.
Specifications subject to change without notice.
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