User`s guide

DO700 V1.0 8/09
2
Introduction
Congratulations on your purchase of the Extech DO700 meter. For best results, please
read the entire manual before use. The DO700 measures Dissolved Oxygen (DO),
Conductivity, pH, mV, and temperature parameters. Conductivity measurements also
yield TDS (total dissolved solids), Salinity, and Resistivity readings.
The built-in microprocessor provides automatic calibration, automatic temperature
compensation, data storage, and self-diagnostics. The digital filter improves
measurement speed and accuracy. The meter offers a backlit LCD display and is dust-
proof and waterproof, meeting IP57.
This meter is shipped fully tested and calibrated and, with proper use, will provide years
of reliable service.
pH Features
The meter can recognize up to 13 types of pH standard buffer solutions. Two special pH
modes (for distilled water and distilled water mixed with ammonia) are provided. These
special modes offer general slope compensation and non-linearity solution temperature
compensation suitable for the electric power and petrochemical industries.
Conductivity Features
Automatic frequency conversion and voltage regulation increases the Conductivity
electrode range (K = 1 to 10 times). One point Conductivity calibration allows
measurements from 0 to 100mS/cm. Up to 8 types of Conductivity standards can be
recognized.
The meter has an automatic range feature with non-linear temperature compensation for
distilled water with Conductivity values lower than 10uS/cm greatly improving accuracy
and suitable for the microelectronics and pharmaceutical industries.
Dissolved Oxygen Features
The latest technology DO electrode offers a temperature and salinity sensor with
automatic temperature compensation and automatic salinity compensation as well as
manual barometric pressure compensation.