This document is an instruction manual for the HI 23 / HI 24 series wall-mounted, microprocessor-based conductivity and TDS process controllers. The document describes the main features of the product and provides functional descriptions for different models.
This document provides operating instructions for the Hanna Instruments HI 23 and HI 24 Series, which are real-time microprocessor-based EC or TDS process controllers. These wall-mounted units offer accurate measurements with flexible ON/OFF or proportional control capabilities, analog input/output, dual setpoints, alarm signals, and RS-485 communication options.
| Display | large LCD with 4% 13 mm digits and 3% 7.7 mm digits |
|---|---|
| Relays | 2 output relays for low conductivity or high conductivity dosage and 1 output relay for alarm condition |
| Calibration Points | 2 points with Hanna EC and TDS calibration solutions |
| EC Working Ranges | 0 to 199.9uS; 0 to 1999S ; Oto 19.99mS; 0 to 199.9mS |
| TDS Working Ranges | 0 to 100.Oppm; 0 to 1000ppm; 0 to 10.00ppt; 0 to 100.Oppt |
| Temperature Compensation | temperature coefficient B selectable from 0 to 10%/°C |
| Input | 4-ring EC/TDS probe with cell constant 2.0 + 10%, or 4-20mA analog input from a transmitter |
| Power Supply | 230 + 10% VAC or 115 10% VAC, 50/60 Hz |
| Dimensions | 221 x 181 x 86 mm (8.7 «7.1.x 3.4") |
The available EC working ranges are 0 to 199.9uS, 0 to 1999S, 0 to 19.99mS, and 0 to 199.9mS.
Yes, for the HI 24 series it is possible to switch to TDS measurements with a conversion factor from 0.00 to 1.00.
The system uses a 3-wire Pt 100 temperature sensor to compensate for cable resistance and provide precise automatic temperature compensation.