1. Float Switches
Water level control

2. Float Switches Water level control
2 designs of float switches are available
Industrial heavy duty
Domestic or economy
Dryden Aqua Ltd | Butlerfield | Bonnyrigg | Edinburgh EH19 3 JQ | Tel Fax

3. Float Switches Water level control
There are two types of industrial float switch
Standard switch which is rated up to 13 amps
Intrinsically safe float switch will only take a very low voltage control signal
Both float switches look identical except for the marking on the base, the ATEX
Intrinsically Safe switch will be stamped on the base with the IS
Industrial float switch
Industrial float switch ATEX approved IS
Dryden Aqua Ltd | Butlerfield | Bonnyrigg | Edinburgh EH19 3 JQ | Tel Fax

4. Atex approved Water level control
Float Switches
Atex approved Water level control
Atex float Max Input Parameters: Ui = 30V, Ii=100mA 8v, 8mA dc minimum contact rating
Type Atex ( Certificate SIRA 04ATEX2187) may be used in zones 1 and 2
Temperature range –20°C to +70C and should not be used outside this range
Max. submerged depth 20 metres
Chemical resistance
Industrial float switch ATEX approved IS
Dryden Aqua Ltd | Butlerfield | Bonnyrigg | Edinburgh EH19 3 JQ | Tel Fax

5. Float Switches Water level control
Standard switch which is rated up to 240v 15 amps non inductive, 240v 10 amps inductive
Maximum size of electrical motor that may be switched is 1.3 hp, 230 v, 50 hz
Maximum water depth is 20m
You may switch the power via the float switch, but the best and safest arrangement
is to use a low voltage such as 12 to 24v ac or dc through the switch, and use a relay
to switch the pump on / off. By this means large electrical motors / pumps may be controlled
Chemical resistance
Industrial float switch Standard
Dryden Aqua Ltd | Butlerfield | Bonnyrigg | Edinburgh EH19 3 JQ | Tel Fax

6. Float Switches Water level control
Economy switch has the same specification as the standard switch
Rated up to 240v 15 amps non inductive, 240v 10 amps inductive
Maximum size of electrical motor that may be switched is 1.3 hp, 230 v, 50 hz
Maximum water depth is 20m
You may switch the power via the float switch, but the best and safest arrangement
is to use a low voltage such as 12 to 24v ac or dc through the switch, and use a relay
to switch the pump on / off. By this means large electrical motors / pumps may be controlled
Chemical resistance
Economy float switch
Polypropylene casing and PVC cable
High level of chemical resistance
Suitable for most water applications
Dryden Aqua Ltd | Butlerfield | Bonnyrigg | Edinburgh EH19 3 JQ | Tel Fax

7. Float Switches How do they work
2 designs of float switches are available
Both float switch work in the same way
Standard switch has integral weight, economy switch has a separate weight
The weight acts as the pivot point for the switch
When the switch tilts to the angle shown an electrical circuit is made or broken
Dryden Aqua Ltd | Butlerfield | Bonnyrigg | Edinburgh EH19 3 JQ | Tel Fax

8. How do they work, electrically
Float Switches
How do they work, electrically
The economy and standard floats have the same wiring
The switches have three wires, brown, black & blue
The Brown wire is the common
By connection of Brown & Black, or Brown & Blue wires the electrical circuit
may be made or broken, you therefore have the option of normally open
or closed circuit on filling or emptying
Dryden Aqua Ltd | Butlerfield | Bonnyrigg | Edinburgh EH19 3 JQ | Tel Fax

9. Float Switches Applications
For ATXE application or potentially explosive environments contact Dryden Aqua
The standard and economy switches may be used for all aquatic environments
Some examples
Tanks
Lagoons
Basement protection from flooding
River and lake level
Water treatment system
Pumping stations
Many industrial applications
Dryden Aqua float switches are used when you require a simple yet robust
means of controlling water levels
Dryden Aqua Ltd | Butlerfield | Bonnyrigg | Edinburgh EH19 3 JQ | Tel Fax

10. Float Switches Water level control
Contact Dryden Aqua for more information or to place an order
You may order on-line from
Dryden Aqua Ltd | Butlerfield | Bonnyrigg | Edinburgh EH19 3 JQ | Tel Fax