Operation & Maintenance Manual
OMM1002
Introduction
The SGUV Mk.2 is a flow meter specifically designed to meet the requirement for a direct reading flow meter for use in Au-
tomatic Sprinkler, Water spray or Deluge systems. It is approved for regular monitoring and testing of such systems by the
LPCB (Loss Prevention Certification Board), under their
‘
Rules for Automatic Sprinkler
Installations
’
(LPS1045), in the UK.
The SGUV Mk.2 provides a robust, direct reading flow meter for 50, 80, 100, 150 & 200 mm pipelines and is suitable for use
in both Horizontal & Vertical pipes, with the flow in any direction:
•
Horizontally: Left to Right
Right to Left
•
Vertically: Upwards
Downwards
Full bore Isolation valves are located in the by
-
pass loop, allowing meter isolation for Filter cleaning & Tube replacement.
The inline Filter avoids clogging of the by
-
pass loop with any pipeline debris. In addition, a Rodding device ensures that the
secondary Restrictor Orifice remains clear of any smaller particles or algae. Bleed/Drain valves allow venting of trapped Air
or draining of the isolated Indicator by
-
pass loop.
Principles of Operation
The SGUV Mk.2 is a combination of two simple measuring elements:
1. Installed in the main pipeline is a sharp edged Orifice, mounted in a Carrier ring. This assembly produces a
pressure drop proportional to the square root of the flow.
2. Installed across the main Orifice/Carrier assembly is an Indicator by
-
pass loop containing an accurately
calibrated Restrictor (secondary Orifice). This Restrictor converts the main Orifice pressure drop into flow rate, which is
directly proportional to the main pipeline flow.
Materials of Construction
Carrier Assy
Orifice plate: Stainless Steel mounted in: carrier, steel, red polyester powder coated in two styles
Indicator Assy
Housing: die
-
cast aluminum alloy, white polyester powder coated. Bezel: die
-
cast aluminum alloy, black
polyester powder coated. Window: Perspex
Isolation valves; full bore brass ball valve, bright nickel plated. Rodding device: Stainless Steel. Filter ele-
ment: Stainless Steel with 1.5mm perforations. Filter housing: TPX.
Other pipes and connectors: copper and brass, bright nickel plated.
Seals: nitrile and polyurethane. Bleed/drain valve seats: PTFE
Tube Assy
Tube: Borosilicate glass with 100 mm fused in ceramic scale.
Float: Stainless Steel
Float stops: Polypropylene
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