Page 1 of 2 — 990-077
990-077, Issue 1 June 2002
This document is not intended to be used for installation purposes. Every care has been taken in the
preparation of this document but no liability can be accepted for the use of the information therein.
Design features may be changed or amended without prior notice. For more information, contact NOTIFIER.
Charles Avenue, Burgess Hill, West Sussex, RH15 9UF. United Kingdom
Phone: +44 (0) 1444 230 300 Fax: +44 (0) 1444 230 888
ISO9001
Design, Manufacture and Supply
to Quality Management Systems
Certified to ISO9001:1994
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SD-851E
Conventional Photoelectric
Smoke Detector
Section: Conventional Devices
FEATURES
• Low profile design
• Low current draw
• Wide operating voltage 8
to 30VDC
• Bi-colour LED detector
status indicator
• Automatic drift
compenstation
• Programmable Sensitivity
• Addressable Feature
• Advanced maintenance
features via remote hand-
held test unit
• Range of detector bases
available
• Approved to EN54 part 7
(2000)
• 3 Year warranty
Ref No. 199m/03
VdS
G202013
BOSEC
TCC2
9057
GENERAL
The SD-851E forms part of the
Processor enhanced Detection series of
conventional detectors. These
detectors have been produced using
the latest in manufacturing and design
techniques, pushing out the boundaries
of existing conventional detector
technology. With an on board
microprocessor, it’s multitude of
enhanced features including drift
compensation, provides the best in
conventional detection.
The SD-851E photoelectric smoke
detector incorporates an optical
chamber which is continually
monitored by an on board processor
which uses algorithms developed
specifically for the unit. An alarm
signal is only enabled in the detector
once the processor is satisfied that an
incipient fire has been detected therby
reducing the incidence of nuisance
alarms.
‘Drift compensation’ algorithms are
one of the key features of the SD-851E
detector. These internal algorithms
ensure a consistent alarm sensitivity
threshold for periods between service
intervals. This provides the user with
maintenance savings by extending the
period before cleaning of the detector
chamber is required whilst minimising
the risk of nuisance alarms.
The sensitivity of a smoke detector is
critical to its overall performance, this
is reflected in both its ability to detect
real fire conditions and its resilience to
non-fire stimuli. The SD-851E’s
performance can be optimised for it’s
application by selecting from one of
three preset alarm thresholds - Low,
Medium and High, offering greater
stability and optimum performance
within the environment in which it has
been installed. The selection is easily
achieved through the use of a remote
hand-held tool.
The remote hand-held programming
tool can also be used in conjunction
with the PhD series of detectors to gain
access to other enhanced features. The
features available include: read/write
last maintenance date, read chamber
contamination level, read value of
thermal element and perform an alarm
test.
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