Description
Johnson Ultima Switch w/Mirus Auto Control | Boat Supply Store
Engineered for demanding marine environments, this digital bilge pump auto control switch leverages Mirus field effect detector cells for unparalleled reliability. It precisely activates at a 2" fluid level and deactivates at 3/4" with a 3-second delay, preventing unnecessary pump cycling. This solid-state unit handles up to 20 amps at 12/24 volts, offering a maintenance-free solution for offshore fishing vessels or coastal cruisers navigating the waters of Corpus Christi Bay.
Key Features
- Digital Mirus field effect detector cells for advanced water sensing
- Sealed detector cells, never in contact with water, preventing corrosion
- Unaffected by bilge oil or foreign debris for consistent operation
- Precise activation at 50 mm (2") fluid level
- Efficient deactivation at 20 mm (3/4") fluid level
- Delayed start with a 3-second delay to prevent false activations
- High-capacity rating to handle all Johnson Pump submersible pumps up to 20 amps
- Maintenance-free with no moving parts or exposed sensors
Specifications
| Product Specifications | |
|---|---|
| Digital bilge pump auto control switch utilizing Mirus field effect detector cells | Yes |
| Activates at fluid level | 2" |
| Deactivates at fluid level | 3/4" |
| Delay | 3-second |
| Amperage rating | 20 amps |
| Voltage rating | 12/24 volts |
| Electronics | Sealed |
| Moving parts | None |
| Mercury | No |
| Oil and debris resistance | Yes |
| Alarm control | 3-way switch |
| Sensor type | Field effect detector cells |
Who This Is For
Boat owners and marine professionals seeking a reliable, maintenance-free, and advanced automatic bilge pump control switch that is resistant to bilge contaminants and offers precise water level detection. This advanced control is ideal for those who demand high performance and longevity in challenging marine conditions.
How It Compares
| Feature | Johnson Ultima Switch w/Mirus Auto Control | Float Arm |
|---|---|---|
| Detection Technology | Mirus Field Effect Detector Cells (Digital, Solid-State) | Mechanical Float Switch |
| Contact with Water | None (Sealed Sensors) | Direct Contact |
| Resistance to Oil/Debris | Unaffected | Susceptible |
| Moving Parts | None | Yes |
| Activation Level | 50 mm (2") | Approx. 2 inches |
| Deactivation Level | 20 mm (3/4") | Approx. 3/4 inch |
| Max Amperage Handling | 20 Amps | 20 Amps |
| Voltage | 12V or 24V | 12V/24V/32V |
Common Concerns Answered
Why is this switch more expensive than basic float switches?
The Johnson Pump Ultima Switch with Mirus technology represents a significant advancement over traditional mechanical float switches. Its higher initial cost is justified by its completely sealed, solid-state detection system, which eliminates mechanical wear, corrosion, and false activations due to oil or debris, providing superior reliability and longevity.
Does this unit include a bilge pump?
No, the Johnson Pump Ultima Switch is an automatic control switch and requires a separate submersible bilge pump to operate. It is designed to intelligently manage the activation and deactivation of your existing or new bilge pump.
How does its advanced technology justify the price?
The Mirus field effect detector cells are the core of its advanced technology, offering a maintenance-free, highly reliable detection method that is unaffected by common bilge contaminants like oil and debris. This superior performance and reduced risk of failure in harsh conditions differentiate it from less expensive, simpler float switches.
Frequently Asked Questions
How does the Johnson Pump Ultima Switch with Mirus technology detect water?
The switch utilizes Mirus field effect detector cells. These solid-state sensors detect changes in the surrounding dielectric field caused by the presence of water, without direct physical contact.
What is the activation and deactivation level for the Ultima Switch?
The Ultima Switch activates the bilge pump when the fluid level reaches approximately 2 inches (50 mm) and deactivates it when the level drops to approximately 3/4 inch (20 mm).
Can the Ultima Switch be used with oil or debris in the bilge?
Yes, the Mirus field effect detector cells are unaffected by oil or foreign debris, ensuring reliable operation even in a less than pristine bilge environment.
What is the maximum amperage and voltage the Ultima Switch can handle?
The Ultima Switch is rated to handle up to 20 amps at either 12 or 24 volts, making it compatible with most submersible bilge pumps.
Does the Ultima Switch have a delay to prevent false starts?
Yes, it incorporates a 3-second delay after sensing water before activating the bilge pump, which helps to prevent short cycling caused by wave slosh or minor water disturbances.
