HI9913 is a 2-in-1 pH and conductivity controller engineered for cost effective dosage of fertilizer solutions in hydroponics. The relays are activated when pH exceeds the setpoint or conductivity falls below the desired value. Two pumps or electro-valves can be wired directly to the controller and be powered through the terminals. HI9913 accepts pH electrodes with a BNC and a conductivity probe with a DIN connector. HI9913 compensates for the temperature effect on conductivity measurements automatically.
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Designed with mounting holes molded into the housing to assure simple, quick and secure installation without the need for additional hardware. Once all electrical connections are made, the protective cover can be installed over the front panel making it possible to perform all adjustments without disassembling any part of the unit.
When activated, the alarm contacts will open or close, triggering the mechanism of your choice, whether a buzzer, light or any other electrical device. The alarm is activated when the measurements stray away from the set point by a predetermined value in the 0.5 to 2.5 pH range.
Fertilization status can be ascertained from a distance through dosage and alarm LED’s.
The ability to record the data from the process you are monitoring greatly enhances process troubleshooting. By simply connecting a recorder to the controller’s output terminals, you are able to acquire a hard copy of the readings for demonstrative or analytical purposes. The recorder output terminals are isolated from the controller to avoid any interference and are user-switchable between 0 to 20 mA or 4 to 20 mA.
This controller is housed in a rugged, fiber-reinforced, self-extinguishing rugged, modular, fiber-reinforced polypropylene housing. Polypropylene has properties that will resist the harmful effects of most chemicals.
The electrodes can be installed quickly and easily. Simply plug the universal BNC connector into the socket and twist it into a secured position.
0.0 to 14.0 pH
0.01 % pH
0.00 to 10.00 mS/cm
±2% F. S.
Typical EMC Deviation
±0.1 pH and ±2% F. S
maximum 2A (fuse protected), 250 Vac, 30 VDC
Through “OFFSET” and “SLOPE” trimmers for pH, and “ZERO CAL” and “SLOPE CAL” for Conductivity (EC
From 4.0 to 7.0 pH and 1.0 to 4.0 mS/cm (EC)
Two independent controls: pH from 0.0 to 2.0 and Conductivity (EC) from 0.0 to 2.0 mS/cm with two separate time cycles from 0 to 90 seconds
0 to 50°C (32 to 122°F); RH max 95% non-condensing
220/240V or 110/115V at 50/60Hz
181 x 221 x 142mm (7.1 x 8.7 x 5.6″)
1.6 Kg (3.5 lb.)