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OPERATION & MAINTENANCE INSTRUCTION MANUAL
Vane-type Water Flow Detectors, Saddle Connection
Specifications:
Service Pressure: 450 psi
Flow Sensitivity Range for Signal: 15-37.8L/min (4-10 GPM)
Contact Ratings: 8A at 125 / 250VAC; 3A at 24VDC; 2.5A at 30VDC
Operating Temperature Range: 0℃-49℃
Compatible pipe: steel pipe, schedule 10 ~ 40
Maximum Surge: 18 FPS (5.5m/s)
UL Listed, FM Approved
Vane-type water flow detectors that are monitoring wet pipe systems shall not be used in dry pipe, deluge, or
pre-action systems. The surges of water in such systems may break the vane or damage the mechanism.
Do not use in potentially explosive atmospheres.
General Information
Water flow detectors are mounted to water-filled pipes in sprinkler systems. It is used on steel pipe, schedules
10 through 40, sizes 50mm thru 200mm (2" thru 8"). See Table 1 for detectors sizes.
Water flow in the pipe deflects a vane, which triggers a switch usually after a specified delay period. All water
flow detectors have a pneumatically controlled mechanical delay mechanism. Delays reset if the flow of water
stops before the entire delay has elapsed. All switches are actuate when the water flow rate is 10 gallons per
minute or greater, but will not actuate if the rate is less than 4 gallons per minute. This installation manual
covers the following water flow detectors for sprinkler.
Nominal Pipe Size
DN50
DN65
DN80
DN100
DN125
DN150
DN200
Installation Guidelines
NOTE: Do not leave cover off for an extended period of time.
1. These devices may be mounted on horizontal or vertical pipe. On horizontal pipe they shall be installed on
the top side of the pipe where they will be accessible. Be sure there is adequate clearance for installation and
removal. See Fig.1 for mounting dimensions.
2. The device should not be installed within 15cm of a fitting which change the direction of the water flow or
within 60cm of a valve or drain
CAUTION!
Table 1 Detectors sizes
Model
2"
811-020
2.5"
811-025
3"
811-030
4"
811-040
5"
811-050
6"
811-060
8"
811-080
1
Max. Pressure Rating(psig)
450
450
450
450
450
450
450
Date: Apr. 7th, 2021
Rev.A
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Table of Contents
Summary of Contents for SOVAL DN50
- Page 1 4 gallons per minute. This installation manual covers the following water flow detectors for sprinkler. Table 1 Detectors sizes Nominal Pipe Size Model Max. Pressure Rating(psig) DN50 2” 811-020 DN65 2.5” 811-025 DN80 3”...
- Page 2 Notes: Remove burrs from edge of hole. Clean out scale and foreign matter from inside wall of pipe. Table 2 Main dimensions Nominal Pipe Pipe wall thickness Nominal Pipe Hole U-Bolt Nuts Size Size size torque Schedule10 Schedule40 DN50 2” 60.3 2.375 2.77 0.109 3.91 0.154 32+1 40-50 DN65 2.5” 73.0 2.875...
- Page 3 Date: Apr. 7th, 2021 Rev.A OPERATION & MAINTENANCE INSTRUCTION MANUAL Vane-type Water Flow Detectors, Saddle Connection Wiring 1.All model have two SPDT switches，one can be used to operate a central station, while the other contact is used to operate a local audible or visual annunciator. Switch contacts COM and NO are closed when water is flowing and open when it is not.
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