Hochiki SDP-3 Installation Instructions Manual
Hochiki Europe (UK) Limited Page 1 of 5 2-3-0-456/ISS6/JAN16
Hochiki SDP-3 Duct Probe
Installation Instructions
Hochiki's Duct Probe housing allows a standard
photoelectric smoke detection device, either a
conventional detector or an analogue sensor, to be
mounted on the outside of an air duct for the purpose
of monitoring the air within the duct. Air within the
duct is drawn via a pipe into the duct probe's
housing. This allows constant sampling with a
standard, LPCB approved smoke detector and
makes smoke detection within the duct simple,
effective and easy to maintain.
Compatible Hochiki devices that can be used within
the SDP-3 are:
ESP
Analogue
Sensors
ACA (inc all variants),
ACC (inc all variants)
ALG (inc all variants),
ALN (inc all variants)
ALK (inc all variants)
CDX
Conventional
Detectors
SLR (inc all variants)
SLV (inc all variants)
Compatible Hochiki Bases that can be used within
the SDP-3 are:
ESP
Analogue
YBN-R/3, YBN-R/3(SCI),
YBO-R/SCI
CDX
Conventional
YBN-R/6, YBN-R/6SK,
YBO-R/6R, YBO-R/6RN,
YBO-R/6RS.
Mounting Position
The SDP-3 should be installed with the arrow on
the cover corresponding to the direction of airflow in
the duct.
The SDP-3 can be placed horizontally or vertically,
on the top, side or bottom of the duct. Hochiki
recommends that the unit is mounted away from
heating, cooling or humidity devices following the
same guidelines for flow monitors.
The SDP-3 smoke detector must be installed
pointing towards the air flow direction.
A distance of 3 times the duct diameter should be
left before a damper, filter or change of the duct
direction, and 5 times the diameter after these
devices.
NOTE: The word “diameter” has been used
throughout. In the case of square-section ducts this
should be read to mean width.
Hydraulic Diameters
Example of
installations at sources
of interference
Fan
Damper
Silencer
Battery
Air handling unit
Duct Bend
Duct Branching
Duct Narrowing
or Expansion
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Hochiki Europe (UK) Limited Page 2 of 5 2-3-0-456/ISS6/JAN16
Installation Procedure
STEP 1 - Selecting Pipe Length
The supplied 600mm sampling pipe can only be
used with ducts up to a maximum diameter of
600mm, but the pipe can be shortened if required
(see STEP 2).
For ducts with a diameter greater than 600mm
use the 1200mm sampling pipe cut to size but
penetrating the whole width of the duct (see
“Large Diameter Ducts” on Page 2).
For ducts with a diameter greater than 1200mm
contact Hochiki Europe Customer Support for
advice (psupport@hochikieurope.com).
STEP 2 - Adjusting Pipe Length
• After measuring the diameter of the duct and
deducing the length of pipe required, shorten
the pipe if necessary.
• The pipe should penetrate a minimum of 90%
of the width of the duct.
• Do not cut the end of the pipe with warning
label.
• Only cut between sampling holes.
• Once cut to length, insert the end plug.
Large Diameter Ducts
• When using a sampling pipe within a duct
greater than 600mm diameter the pipe should
penetrate the whole duct.
• Shorten the pipe to correct length if required
• Insert the end plug
• Fit the end plastic gasket
• Fit the sealing sleeve
STEP 3 – Insert Pipe into SDP-3
• Insert the pipe into the bottom of the SDP-3.
• Secure the pipe with the locking
(7) Locking screw
(6)
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