Pearl iDoser for Batch Mixing System
The Pearl iDoser with Batch Mixing Mode connects to your HE Anderson nutrient injectors to automatically fill your holding tanks, dose them to absolute recipe perfection, and deliver them to your rooms.
Key Benefits of the Link4 Pearl iDoser Nutrient Dosing System for Batch Mixing
- Automated EC and pH management for batch mixing systems
- Maintains consistent nutrient concentrations throughout the cycle
- Ideal for growers managing multiple crop zones and feeding programs
- Configurable recipes and 6 customizable schedules for different nutrients
- Built-in alarms, safety monitoring, and activity logging both on-site and off-site
- Works standalone or with Link4 cloud connectivity for remote control and programming
- Uses Modbus communication to send/receive data from Modbus registers
- Integration with the Link4 Cloud
- Monitors: EC, pH, flow rate, and total flow today
- Up to 6 scheduled recipes
- Injection management: active recipe, injection start and end times, total injection duration, pump injector status
- Flow monitoring: Daily flow rate, weekly flow rate, K-factor
- Logged events include: zone, channels, recipe used, start and end times, volume delivered
- Multiple nutrient recipe management and editing from cloud interface
- CPS (chemical per stroke) support (if implemented)
1. What is the Link4 Combination Motor Starter?
A combination motor starter is an all-in-one unit that includes:
- A contactor to start and stop the motor
- Overload protection to prevent motor burnout
- Control power components ready to connect to your signals
Everything comes pre-assembled in a single enclosure. It safely starts and stops any non-reversing 3-phase motor while protecting it from overcurrent damage. This is ideal for greenhouse fans, irrigation pumps, cooling systems, and more.
2. What makes this different from a standard motor starter?
A standard motor starter often requires external control boards, separate overload relays, and significant field wiring. The Link4 combination motor starter simplifies this:
- Pre-wired internally — no field wiring between components
- Built-in 24VAC control power — works with sensors and automation signals out of the box
- HOA (Hand / Off / Auto) control included — no extra switches or panels needed
- Overload relay included — protection is built in, not bolted on
The result is faster installation, fewer errors, and less time troubleshooting.
3. What motors can the combination motor starter control?
This unit is designed for any non-reversing 3-phase motor, including, but not limited to:
- Ventilation and exhaust fans
- Pumps and compressors
- Conveyors and material handling equipment
- Cooling and HVAC units
- Irrigation and fluid transfer motors
If it’s a 3-phase motor that runs in one direction, this starter can control it.
4. What amp ranges are available?
We have 6 standard units, which cover motors from 0.63A to 8A. Higher amp ranges are available on request for larger loads. Contact Link4 to discuss sizing for your specific application.
5. What does HOA (Hand / Off / Auto) control do?
HOA control gives you three operating modes in one selector switch:
| Mode | What It Does |
| Hand | Runs the motor manually — useful for testing or override |
| Off | Stops the motor completely |
| Auto | Runs based on an external signal — dry contact, timer, or sensor |
6. Does it need a separate control panel to operate?
No. The combination motor starter is designed to operate standalone. Built-in control logic handles basic start/stop operation without any external controller. For simple, single-motor applications, it works right out of the box.
7. What motor protection is included?
Every unit includes a thermal overload relay that:
- Continuously monitors the motor’s current draw
- Trips automatically if the motor exceeds its rated current for too long
- Prevents motor burnout, winding failure, and unplanned downtime
It’s the same protection found in industrial motor control centers built directly into the enclosure.
8. What control voltage does it use?
The Link4 Combination Motor Starter runs on 24VAC. It’s safer for technicians and compatible with most common automation signals.
9. Is it suitable for harsh or demanding environments?
Yes. The enclosure is rated NEMA 4X, which means it handles:
- Dust and particulates
- Water spray and washdowns
- Corrosive atmospheres
NEMA 4X is one of the highest ratings for electrical enclosures and is appropriate for industrial, agricultural, food processing, and outdoor applications.
10. Can it be installed outdoors?
Yes. The NEMA 4X enclosure is weather-resistant and rated for both indoor and outdoor use, including exposed pump stations, rooftop units, and open-air equipment installations.
11. What input voltages does it support?
The combination motor starter supports standard 3-phase systems at:
- 208V
- 220V
- 480V
This covers most commercial and industrial electrical systems across North America.
12. Can I monitor or control it remotely?
Yes — when connected through the Link4 system, you can:
- Receive real-time alerts if the motor trips or goes offline
- View run history and usage logs
- Manage multiple motor starters across different sites
- Control equipment from a single centralized dashboard
This is particularly valuable for facilities running multiple motors across large or multi-site operations.
13. Do I need special electrical training to install it?
Installation is straightforward because the internal components are already factory pre-wired. You only need to connect:
- Incoming 3-phase power (208V, 220V, or 480V)
- Motor leads (to the load terminals)
- Control signal (24VAC or dry contact)
A licensed electrician should always handle final power connections, but the pre-wired design cuts installation time significantly compared to field-assembled starters.
Link4 Cloud for Web, Android, and iOS
The Link4 Cloud is the latest innovation to Link4 technology, supporting the new Pearl controller.
Monitor and set your controllers from anywhere. Create reports, view graphs, and collect data. Log notes using the Grow Journal. Do all of this and more using the intuitive user interface.
