This manual introduces the product features, usage and maintenance of HI 9913-HI 9923 HI 9935 Wall Mounted Dual Conductivity/TDS & pH Controllers.
This instruction manual provides guidance for the use of Hanna Instruments' HI 9913, HI 9923, and HI 9935 wall-mounted controllers. These devices are designed to meet process control requirements in horticultural, hydroponics, agricultural, boiler, and cooling tower applications. The instruments feature two separate relays for pH and conductivity/TDS measurements, with some models offering proportional control to save on chemical usage.
All models provide for two separate relays, one for pH and another for Conductivity/TDS.
The controllers operate with optional Hanna 4-ring probes to provide linear and repeatable measurement.