KELCO ub25 Installation And Operation Instructions For

INSTALLATION AND OPERATION INSTRUCTIONS FOR
Please read these installation and operating instructions fully and carefully before installing or servicing this Inline
Flow Switch. The UB25 Series in line flow switch is mains voltage device. Death or serious injury may result if this
switch is not correctly installed and operated. All electrical work must be performed by a fully qualified and licenced
electrician.
The UB25 flow switch is a magnetically operated switch that will turn on or off in response to liquid flow. The body of the switch contains a piston that partly
obstructs the line of flow. To pass through the switch, the process liquid must push the piston back and flow over it and out through the outlet of the switch.
When flowing liquid pushes the piston back, a magnet inside the piston actuates a reed switch in the electrical housing. The reed switch is used to provide
a set of closed (or open) electrical contacts that are either used directly as a switch, or to control an in built Triac or relay which in turn is used as the output
device.
The output of the switch can be used in control circuits to indicate flow, or to directly actuate small pump motors. The body of the UB25 flow switch contains
a second magnet that opposes the magnet in the piston. The repulsive force generated between the piston and the body magnets constantly pushes the
piston back to the off position, against the incoming flow. This unique magnet system negates the need for metal springs and provides the switch with
exceptional reliability.
The UB flow switch can be mounted in any orientation in the pipe work, including upside down. There is a direction of flow arrow on he electrical enclosure.
This directionality must be adhered to, as the switch will not operate against a reversed flow. Pipe work can be used to support the switch, or the switch
can be screwed directly into valve manifolds or pump ports. Use thread tape or sealant and do not use this flow switch as a non-return valve.
For increased sensitivity, UB25 inline flow switch is supplied with a non-magnetic piston retainer. The non-magnetic piston retainer is for use in vertically
mounted applications only. Please see maintenance details overleaf for information on installing the non-magnetic piston retainer.
The UB25 flow switch has a high pressure rated solid metal body, suitable for applications involving neutral liquids such as hot or cold water, or oils. The
UB25 flow switch contains a close fitting piston, and should only be used in applications where the process fluid is reasonably clean and free of entrained
or suspended material. This switch should not be used with fluids containing large particulate matter, ferrous materials or fibrous matter. If the degree of
contamination of the process fluid can't be guaranteed, then suitable line filtration should be fitted to the system. The standard UB25 flow switch is
constructed from solid brass. The piston and electrical housing are made from glass reinforced polypropylene.
The UB25 flow switches are weatherproof to IP67 and they are suitable for all outdoor exposed applications. The switch should be protected from exposure
to liquid temperatures in excess of 90°C. The UB25 series flow switch should not be used in applications where the line pressure exceeds 200 bars, in the
interest of safety, the switch has a burst pressure rating of >400 bars. Care should be taken not to expose this flow switch to excess back pressures such
as may be generated by a sudden reverse flow. In such applications, a dedicated non return valve should be fitted to the system. The environmental
limitations and the main performance parameters of both models are set out in the table below.
Parameters
Switching Point on a Slowly Rising Flow +/-15%
Switching Point on a Slowly Falling Flow +/- 15%
Minimum Gravity Head Required to Actuate the Switch
Maximum Recommended Continuous Flow (Water)
Maximum Recommended Operating Pressure,
Static or Dynamic
Minimum Burst Pressure
Maximum Liquid Temperature
Minimum Liquid Temperature
Ingress Protection Rating (Weatherproof Rating)
THE UB25 IN LINE FLOW SWITCH

INTRODUCTION

INSTALLATION

OPERATING ENVIRONMENT

OPERATING PARAMETERS

UB25 Standard
1.5 Litres per Minute
1.2 Litres per Minute
1.5 Metres
90 Litres per Minute
200 Bars (2900 PSI)
400 Bars (5800 PSI)
90ºC
-20ºC
IP67

WARNING

UB25 With supplied non-magnetic piston retainer fitted
30 Litres Per Hour +-10%
30 Litres Per Hour +-10%
0.5 Metres
90 Litres per Minute
200 Bars (2900 PSI)
400 Bars (5800 PSI)
90ºC
-20ºC
IP67