pH and Conductivity Controller (Wall Mounted) - HI9913-2

In stock
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.
  • Proportional pH and conductivity (EC) control.
  • Triple contact alarm system.
  • Cost effective 2-in-1 design for versatility.

Easy Installation

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.


Triple Contact Alarm System

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.


Visual Status Indicators

Fertilization status can be ascertained from a distance through dosage and alarm LED’s.


Isolated Recorder Output

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.


Durable Construction

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.


BNC Connection

The electrodes can be installed quickly and easily. Simply plug the universal BNC connector into the socket and twist it into a secured position.




pH Range

0.0 to 14.0 pH


0.01 % pH


±0.02 pH

Conductivity Range

0.00 to 10.00 mS/cm


0.01 mS/cm


±2% F. S.

Typical EMC Deviation

±0.1 pH and ±2% F. S

Dosing Relay

maximum 2A (fuse protected), 250 Vac, 30 VDC Calibration Through "OFFSET" and "SLOPE" trimmers for pH, and “ZERO CAL” and “SLOPE CAL” for Conductivity (EC

Setpoint Range

From 4.0 to 7.0 pH and 1.0 to 4.0 mS/cm (EC)

Proportional Control

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

Power Supply

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.)