07/17
© Eaton MEDC Ltd 2017
5. CERTIFICATION/APPROVALS
Please refer to marking on the unit for specific approval details.
s 5,LISTEDFORUSEIN
#LASS$IVISION'ROUPS#$
USA (USL)
Class 1, Zone 1, Groups IIA & IIB.
s 5,3TANDARDS
5,5,
s 3UITABLEFORHAZARDOUSLOCATIONlREALARMAPPLICATIONS
6. CERTIFIED TEMPERATURE
–25°C to +55°C
–13°F to +131°F
Introduction
The DB1H Sounder has been designed for use in potentially explosive atmospheres and harsh
environmental conditions. The marine grade alloy or stainless enclosures are for use offshore or
onshore, where light weight combined with corrosion resistance and strength is required.
The safety function of the Sounder is to provide a pre-determined audible warning sound when
required if the correct voltage is applied to the unit. The DC version of the Sounder is designed to
operate on a supply voltage tolerance of +/- 20%,
Under No fault (Normal) Operating conditions the DB1 Sounder will provide an audible warning
sound when required by the system.
Under fault conditions the failure mode of the Sounder is a failure to provide an audible warning
sound. For the failure rate associated with this failure mode please refer to the table below.
Assessment of Functional Safety
This Sounder is intended for use in a safety system conforming to the requirements of IEC61508.
UL has conducted a Failure Modes Effect and Diagnostic Analysis (FMEDA) of the DC version of DB1H
Sounder against the requirements of IEC 61508-2 using a Proof Test Interval of 8760hrs.
The results are shown below and are based on Route 1
H
The Sounder is classed as a Type B device
7. FUNCTIONAL SAFETY - DB1H
