Sontay SD-D Manuel utilisateur

Tel: +44 (0)1732 861200 - E-mail: [email protected] - Web: www.sontay.com

SD-D

Duct Smoke Detector

Issue Number 7.1

30/09/2021

Four Elms Road - Edenbridge

Kent - TN8 6AB - UK

1 of 3

Features and Benefits

Product Codes Specification

SD-SDuct smoke detector

Technical Overview

The SD-D duct smoke detector operates on the obscuration principle, using infrared technology and is designed specifically to cope with the

difficult measurement conditions in air ducts, such as high velocity and levels of dirt accumulation. The relay output is either auto or manual

reset relay output on detection of smoke.

Supply 24Vac/dc, ±20%

Power consumption 50mA max.

Relay outputs (smoke & fault)

SPST 2A @ 48V

Minimum duct size 100 x 320mm

Maximum duct size 450 x 450mm*

LED indication ON in alarm

Alarm relay (selectable) Manual or auto reset

Probe:

Dimensions 300 x 20mm dia.

Material Plastic

Housing:

Material PC/GF (Halogen free, flame retard

ant & UV stabilized)

Dimensions 125 x 105 x 85mm

Environmental:

Housing: -30 to +60°C

20 to 80% non-condensing

Media: 10 to 40°C

Protection IP65

Country of origin Denmark

Conformity EMC, CE & UKCA Marked

* Please see recommendations on page 2.

• Manual or auto reset

• Fault relay output

• Self-test feature

WEEE Directive:

At the end of the products useful life please

dispose as per the local regulations.

Do not dispose of with normal household waste.

Do not burn.

Tel: +44 (0)1732 861200 - E-mail: [email protected] - Web: www.sontay.com

SD-D

Duct Smoke Detector

Issue Number 7.1

30/09/2021

Four Elms Road - Edenbridge

Kent - TN8 6AB - UK

2 of 3

How It Works

The sensor works by using an infra-red transmitter and receiver fitted to the PCB inside of the housing. The transmitting device sends a beam,

which is reflected from a mirror in the end of the 300mm long probe, and the receiving device then receives this beam when there are no ob-

stacles, like smoke partials in the tube. If smoke is present, then this will disturb the beam, and the receiver will lose the signal and an alarm

will be activated.

Calibration at start-up

On power up the SD-D will start an automatic calibration procedure, the power from the TX device will increase in small steps, just until the RX

device receives enough signal to validate the “link”. This is stored in the volatile memory for any further use, or until a new power on. Now any

obstacles, like smoke will force an alarm.

Periodic calibration

The mirror over time may lose the possibility to reflect the full IR light level due to a contamination build up, such as dust. Periodic calibration is

carried out automatically by the smoke detector every 7 days to compensate for this.

Recommendations

• The SD-D has a probe length of 300mm and should NOT be used in ducts with a diameter or square size greater than 450mm, unless

the smoke detection is intended as a secondary non-life safety action with areas served being covered by smoke detection connected

to a fire alarm system that is able to shut-off the ventilation fans, as it will not monitor the whole of the duct.

• Must be mounted AFTER filters and humidification plant, this will prevent any spurious alarms caused by dust or water vapour.

• Units should NOT be mounted where ambient sunlight will fall on the photocell.

• Units should never be mounted at or near sharp bends in ductwork, as turbulence and side currents can carry the smoke away from

the probe.

• The SD-D is an optical beam detector and therefore, air velocity has little effect on performance. However, careful positioning of the

detector is required if optimum detection is to be achieved. The detector should always be fitted with the holes in the sensing tube par-

allel to the airflow.

• Units should not be mounted close to supply or extract fans.

• With large installations, where several ducts collect into a common duct, consideration must be given to dilution of smoke and rate of

airflow. For example, 10 small ducts may feed at different points into one large main extract duct, and if only one smoke detector is

fitted in the main extract duct, the position can arise where one duct is feeding smoke and nine are feeding clean air. The amount of

smoke is therefore diluted by 90%, and if this is coupled with a high flow rate, the smoke may not be detected for the minimum operat-

ing period of 1 second, resulting in no alarm being generated. It may be necessary to mount 10 detectors in each of the small ducts to

guarantee correct operation.

Tel: +44 (0)1732 861200 - E-mail: [email protected] - Web: www.sontay.com

SD-D

Duct Smoke Detector

Issue Number 7.1

30/09/2021

Four Elms Road - Edenbridge

Kent - TN8 6AB - UK

3 of 3

Installation

1. The SD-D should only be installed by a competent, suitably trained technician, experienced in installation with hazardous voltages.

(>50Vac & <1000Vac or >75Vdc & 1500Vdc)

2. Ensure that all power is disconnected before carrying out any work on the SD-D.

3. If the sensor is mounted outside, it is recommended that the unit be mounted with the cable entry at the bottom. If the cable is fed from

above then into the cable gland at the bottom, it is recommended that a rain loop be placed in the cable before entry into the sensor.

4. Select a location in the duct where dust & contaminants are at a minimum (i.e. after filters etc.). Fix the housing to the duct with appro

priate screws.

5. Release the snap-fit lid by gently squeezing the locking tab.

6. Feed the cable through the waterproof gland and terminate the cores at the terminal block. Leaving some slack inside the unit, tighten t

he cable gland onto the cable to ensure water tightness. Maximum cable is 2.5mm², care must be taken not to over tighten terminals.

7. Ensure the supply voltage is within the specified tolerances and snap shut the lid after the connections have been made.

Connections

1. Fault Output Common

2. Fault Output Normally Closed*

3. Smoke Detection Output Common

4. Smoke Detection Output Normally Closed*

5. Supply +24Vac/dc, ±20%

6. Supply 0V

* See alarm conditions

Changing Reset Modes

Manual to Auto reset

•Press and hold the external reset button

•After approx. 5 seconds, the internal green LED will go off for 1 second.

•Release the button and the device is now in auto reset mode. The PCB mounted LED will be constantly lit green.

Auto to Manual reset

•Press and hold the external reset button

•After approx. 5 seconds, the internal green LED will go orange and the external LED will go red for 1 second.

•Release the button and the device is now in manual reset mode. The PCB mounted LED will be constantly lit green.

Calibration & Alarm Conditions

While the detector is auto-calibrating, the internal LED will flash red 6 times a second. When calibration is finished, the LED will change to or-

ange for a few seconds, the calibration is being stored in the volatile memory.

The PCB LED will then be continuously lit green, this also indicates that the sensor is powered correctly and not in alarm.

If the detector is in alarm or a fault has occurred, the internal & external LED’s will change to red.

Under normal operating conditions the relay is energised. Therefore, if any fault develops the relay will de-energise shutting off the equipment

connected to the relay, i.e burner or circulating fan, rendering the installation safe.

Relay status

• Un-powered Open

• Powered Closed

• Alarm Open

Self-Test, Failure Mode & Manual Reset

• The output of the SD-622 can be manually overridden, to check integrity of the field wiring. To operate press the PCB mounted button.

In self-test mode both relay outputs will open, the external and the internal LED will be red.

• The external LED will flash red if the detector fails.

Test

button

LED

SUPPLY

24Vac/dc

RELAY

OUT

FAULT

1 2 3 4 5 6

COM NC COM NC +IN GND

RELAY

OUT

SMOKE DET.

TEST

Whilst every effort has been made to ensure the accuracy of this specification, Sontay cannot accept responsibility for damage, injury, loss or expense resulting

from errors or omissions. In the interest of technical improvement, this specification may be altered without notice.

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