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IOM SPDB Iss.2 ENG 

March 2019 

Page 1 of 6 

1A Bennett House, The Dean, Alresford, Hampshire, UK. SO24 9BQ

 

Tel: +44 (0)1962 736736    Fax: +44 (0)1962 736737    Email: sales@influxmeasurements.com

 

 
 
 
 

A GUIDE TO THE INSTALLATION, OPERATION & MAINTENANCE OF 

Flow Switches SPDB 30/90 

FLOW SWITCHES IN AUTOMATIC SPRINKLER INSTALLATIONS 

 

 
 
 

 
 
 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

 
 

Contents: 

Page 

1

 

Specification & Principle of Operation 

2

 

1.1

 

Introduction 

2

 

1.2

 

Construction & Specification 

2

 

1.3

 

Principle of Operation 

2

 

2

 

Installation 

3

 

2.1

 

Mechanical 

3

 

2.2

 

Electrical & Power Supply 

5

 

3

 

Operation 

6

 

3.1

 

Flow 

6

 

3.2

 

Auxiliary Relay Output 

6

 

4

 

Maintenance 

6

 

4.1

 

Normal 

6

 

4.2

 

Fault 

 
 
 

 

T

YPE 

-

 

F

IREGROOVE

 

T

YPE 

-

 

F

IREFLANGE

 

M e a s u r e m e n t s   L t d 

Quality Systems Certificate No. 464 

Assessed to ISO 9001:2015 

24 

Summary of Contents for SPDB 30

Page 1: ...ITCHES IN AUTOMATIC SPRINKLER INSTALLATIONS Contents Page 1 Specification Principle of Operation 2 1 1 Introduction 2 1 2 Construction Specification 2 1 3 Principle of Operation 2 2 Installation 3 2 1 Mechanical 3 2 2 Electrical Power Supply 5 3 Operation 6 3 1 Flow 6 3 2 Auxiliary Relay Output 6 4 Maintenance 6 4 1 Normal 6 4 2 Fault 6 TYPE FIREGROOVE TYPE FIREFLANGE M e a s u r e m e n t s L t d...

Page 2: ...ure Range 2 to 68 C Input Voltage 24V D C Flow Switch Output 1x DPCO Relay 30V D C 2A Adjustable Delay Type SPDB 30 0 to 30 seconds Type SPDB 90 0 to 90 seconds Flow rate Sensitivity The switch will operate at all flow rates above 60 L min The switch will not operate at flow rates less than 10 L min 1 3 Principle of Operation Water flow passing the sensor probe causes a change in relative temperat...

Page 3: ...possibility of positioning the probe where a permanent air pocket is likely to occur Table 2 1 b shows mechanical Tees and adaptors that can be used when replacing a mechanical flow switch in an existing installation After applying suitable thread sealant or PTFE tape to the threads the unit should be hand tightened into the Mechanical Tee and then finally tightened using a spanner to form a press...

Page 4: ...IOM SPDB Iss 2 ENG March 2019 Page 4 of 6 2 1 b Top and side mounting positions on horizontal pipe ...

Page 5: ...raw of 60mA on a 24V system This mA figure should be multiplied by the number of hours that the batteries are required to last For example if a 24V backup battery is required to last for 72 hours 0 06A x 72h 4 32 Ah There fore a 24V battery supply with a rating of at least 5Ah should be used The power supply connections should be connected to the V and V terminals The Earth terminal should also be...

Page 6: ...her auxiliary relay is provided in the unit which can be used for other supervisory duties outside of the scope of EN 12259 5 A separate leaflet is available for further information on additional functions 4 Maintenance 4 1 Normal The SprinklerSense flow switch uses solid state sensing technology and requires no routine maintenance in normal operating conditions Ensure any valves controlling the w...

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