Wall-mountable spray head unit

1. A wall-mountable spray head unit comprising:

a rotatable spray head assembly which comprises:

a spray manifold rotatable about a first axis;

a spray nozzle supported by the spray manifold and orientated to deliver fire-suppressant material radially in a plane defined by the first axis and a second axis which is perpendicular to the first axis; and

at least one thermal sensor supported by the spray manifold, aligned with the nozzle, aligned with the plane and configured to move with the nozzle and sense in the plane,

wherein the spray manifold comprises a face that is rotatable about the first axis and wherein the spray nozzle and the at least one thermal sensor are set in the face; and

a pivot base on which the rotatable spray head assembly is mounted, the pivot base comprising an inlet port through which the fire suppressant material enters the wall-mountable spray head unit, an outlet port through which the fire-suppressant material enters the rotatable spray head assembly, and a diagonal channel for the fire-suppressant material between the inlet and outlet ports,

wherein the inlet port is in fluid communication with the nozzle via the outlet port and is offset in a direction into a wall with respect to the first axis, and wherein the outlet port is aligned with the first axis and extends into the spray manifold.

2. A spray head unit according to claim 1 , wherein the first axis is a vertical axis and the plane is a substantially vertical plane.

3. A spray head unit according to claim 1 , wherein the spray manifold is only rotatable about the first axis.

4. A spray head unit according to claim 1 , wherein the, or each thermal sensor, comprises an infrared thermometer.

5. A spray head unit according to claim 1 , wherein the, or each thermal sensor, comprises an infrared camera or array of discrete infrared sensors.

6. A spray head unit according claim 1 , wherein the spray nozzle and the thermal sensor are offset in a direction parallel to the first axis.

7. A spray head unit according to claim 1 , further comprising:

an actuator configured to cause rotation of the spray manifold about the first axis.

8. A spray head unit according to claim 7 , wherein the actuator is a servo motor.

9. A spray head unit according to claim 1 , comprising two or more nozzles.

10. A spray head unit according to claim 1 , further comprising:

an enclosure having an aperture,

wherein the rotatable spray head assembly is housed or mainly housed in the enclosure.

11. A spray head unit according to claim 10 wherein the enclosure comprises:

first and second end plates; and

tubing interposed between the first and second end plates.

12. A spray head unit according to claim 10 wherein the enclosure comprises a mounting box and a faceplate.

13. A spray head unit according to claim 10 , wherein the rotatable spray head assembly is arranged such that, in a parked position, the nozzle and thermal sensor are not visible through the aperture from outside the unit.

14. A spray head unit according to claim 10 , wherein the rotatable spray head assembly is arranged such that, in an operating position, the nozzle and thermal sensor are visible through the aperture or the nozzle and thermal sensor protrude through the aperture.

15. A spray head unit according to claim 1 , wherein the rotatable spray head assembly comprises:

a valve;

wherein the rotatable spray head assembly is arranged such that, in a parked position, the valve is closed.

16. A spray head unit according to claim 1 , further comprising:

a control unit operatively connected to the at least one thermal sensor and configured to control rotation of the rotatable spray head assembly.

17. A spray head unit according to claim 1 , configured, in use, to sweep the rotatable spray head assembly through an angular range around the first axis of at least 120°.

18. A spray head unit according to claim 1 , configured to deliver the fire-suppressant material in an arc of at least 2×25°, wherein the arc is in the plane.

19. A spray head unit according to claim 1 , configured to deliver a mist of the fire-suppressant material.

20. A spray head unit according to claim 1 , wherein the fire-suppressant material is water or is a mixture containing water.

21. A fire suppression system comprising:

at least one wall-mountable spray head unit according to claim 1 , which is wall mounted;

at least one pressure generator for supplying fire suppressant material to the at least one wall-mountable spray head unit under pressure; and

at least one activation device which, in response to an activation signal, causes fire suppressant material to spray out from the spray head(s) of the at least one wall-mountable spray head unit.

22. A building automation system including:

a fire suppression system according to claim 21 which controllable from a remote location.

23. A method of operating a spray head unit according to claim 1 , comprising:

rotating the spray head assembly about the first axis,

monitoring signals from the at least one thermal sensor;

processing the signals so as to identify an angle of rotation; and

causing the spray head assembly to stop rotating at the angle of rotation.

24. A method according to claim 23 , further comprising:

sending a signal for causing a pump and/or valves to be operated.

25. A method according to claim 23 , wherein rotating the spray head assembly comprises sweeping the spray head back and/or forth at least once.

26. A method according to claim 23 , comprising:

starting to deliver the fire-suppressant material after the spray head assembly has stopped rotating at the angle of rotation.

27. A non-transitory computer readable medium, which stores or carries a computer program that, when executed by at least one processor, causes the at least one processor to perform the method according to claim 23 .

28. A hardware processor configured to perform a method according to claim 23 .