HI981413 Nutrient Dosing System is designed to maintain the concentration of fertilizer nutrient solution used in hydroponics and irrigation water. The HI981413 uses an amperometric conductivity sensor to measure the amount of fertilizer in the solution. The meter can be programmed to display results as EC (electrical conductivity) or as TDS (total dissolved solids). The EC results are displayed as mS/cm while TDS is displayed as ppm with a selectable conversion factor from 0.45 to 0.99. The HI981413 was developed as a cost-effective solution for the horticulturist to maintain the ideal fertilizer concentrations by placing the probe and injection valve in-line with the re-circulation pump to provide the chemical to be dosed.
Multi-color LCD
The HI981413 features a multi-colored LCD to show the status of the pool controller. The display is green during normal opperation, yellow if the control is not enabled, or flashes red when an alarm is triggered.
Intuitive LCD
Both conductivity or TDS and temperature are displayed with status icons that show when the pump is dosing and the control mode status.
Programmable Alarm System
Hanna controllers allow users to enable or disable the low and high-level alarms for EC/TDS. When an alarm is activated, all dosing will stop. For added safety, the alarm system also offers overdosing protection in that if the set point value is not corrected within a programmed time interval then the meter will go into alarm status.
On-Screen Features
Adjustable Flow Rate
The flow rate from the dosing pumps is adjustable from 0.5 to 3.5L/h. Larger bodies of water require more chemical to be dosed than smaller ones in per unit of time. The adjustable flow rate, like the proportional band, allows for better control in maintaining a desired set point .
Automatic Proportional Pump Control
The peristaltic dosing pump can be controlled by simple on/off or more advanced proportional control which helps prevents overshooting of the set point. When using proportional control the flow rate that is programmed, will be impacted by the proportional band used. The closer the reading is to the set point the longer it takes for the peristaltic pump to complete one revolution. If the reading is outside the proportional band then the amount of time it takes to complete one revolution is based on the flow rate programmed.
Acid Tank Level/Flow Switch Input
The BL100 allows for a connection to an optional level controller or flow switch. This input can be used to disable the dosing pump when there is no chemical left in the reservoir tank or there is no flow due to the pump being turned off.
Built-in Dosing Pump
Peristaltic Dosing Pump
The HI981413 features a peristaltic dosing pump that is superior to diaphragm versions due to the ability to self-prime when there is no liquid in the uptake line.
Brushless Motor
The brushless motor does not have nay gears or brushes that can wear out. A brushless design provides for a long life and little maintenance. The compact stepper motor allows for very precision control over the dosing of the chemical.
Long-life Peristaltic Tubing
The industrial grade peristaltic tubing is chemical resistant and provides for a relatively long-life. As tubing stretches over time it can be easily replaced. No special tools required.
Conductivity electrode with flow cell
Three Configuration Options
The HI981413 is available in multiple configurations including a meter only, meter and probe, and a complete package that includes bypass loop and panel mounted flow through cell. All models include aspiration tubing with filter and dispensing tubing with injection valve.
HI30003 Amperometric Conductivity/Temperature Probe
The HI981413 uses the HI30003 probe that incorporates both conductivity and temperature sensors and connects to the controller with a single waterproof Quick Connect DIN connector.
NPT Threads for In-line and Tank Mounting
The ABS body of the probe has a 1/2” threaded fitting for insertion to an in-line “T” fitting or the flow cell. The back end part of the probe has 3/4” NPT threads for submersion/ tank mounting. The probe body has a hex fitting for tightening snuggly with a wrench. .
