This document is the instruction manual for the HI 98143 pH & EC Transmitter with Isolated Output. It provides information about the warranty terms and maintenance requirements of the product. The transmitter features isolated output and is designed for pH and EC measurement. It is warranted for two years, while the electrodes and probes are warranted for six months.
The HI 98143 is a panel-mounted pH and EC transmitter designed to accept signals directly from a pH electrode and conductivity probe simultaneously. It features isolated outputs available in 0-1 V, 0-4 V, or 4-20 mA configurations, with output signals proportional to input signals but independent of load or cable capacitance changes.
The document details the preliminary examination, functional description including terminal layouts, connection procedures for probes and power, operational guide for wall-mounting and measurement, probe maintenance routines, and step-by-step calibration instructions for both pH and EC parameters using specific buffer solutions.
| Range (pH) | 0 to 14 pH |
|---|---|
| Range (EC) | 0 to 10 mS/cm |
| Accuracy @ 25°C/77°F pH | +/- 0.5% Ts. |
| Power Supply | 12-24 Vdc |
| Environment Temperature | 0 to 50°C (32 to 122°F) |
| Dimensions | 160 x 105 x 31mm |
The transmitter is available in four models transmitting at 0-1 V, 0-4 V, or 4-20 mA signals.
Frequent calibration is recommended for better accuracy, and it should be performed whenever the pH electrode is replaced.
The electrode should be stored with a few drops of storage (HI 70300) or pH 7 (HI 7007) solution in the protective cap.