- 3 -
1
Overview
Thank you for purchasing Apera Instruments DO850 Portable Optical Dissolved Oxygen Meter. The
DO850 measures dissolved oxygen in water using luminescence technology through an optical
sensor and displays data with intelligent instrumentation. Compared to conventional electrochemical
dissolved oxygen meter, the DO850 is more accurate, stable and easier to use.
Before you use the instrument, please carefully read the instruction manual to help you properly
perform tests and maintainenance.
1.1
Luminescent optical sensor.
⚫
Stability and Accuracy: Oxygen is not consumed during measurements. It is not affected by
sample flow rate and thus provides a stable measurement.
⚫
Easy to Use: No electrolytes or membranes are required; frequent calibration is not
necessary.
⚫
Interference-Free: Sensor cap is coated with a light-shielding layer and minimizes the impact
from external light sources. The use of non-chemical sensors helps reduce a variety of heavy
metal ions interference in the aqueous environment with H
2
S and NH
4
and other chemical
substances.
⚫
Long service life: except for mechanical deterioration (such as scratches to the light shielding
layer), the sensor cap has up to 8000 hours of service life.
⚫
Easy to calibrate and maintain. Probe is equipped with a calibration/storage sleeve, which
makes calibration and maintenance more convenient and reliable.
1.2
Intelligent Instrumentation
⚫
Built-in microprocessor chip, featured with Auto. Temperature Compensation, Auto. Air
Pressure Compensation, Auto. Salinity Compensation and parameter setting, auto. power off,
and low power indication.
⚫
Stable reading and automatic locking modes available.
⚫
Clear large-size LCD display with white backlight.
⚫
Meets IP57 waterproof rating; In addition, a rugged instrument suitcase is provided.
Special Notes
⚫
Sensor cap surface coating can not withstand high temperature, so the optical dissolved
oxygen electrode can not test water with temperature over 50
℃
.
⚫
When the electrode is not in use, it should be kept in the storage sleeve and the
sponge in the cap should be kept moist, so that the fluorescent cap will not dry out. If
the sponge is dried out or the probe is exposed in dry air for more than 8 hours, soak
the electrode in tap water for 24~48 hours (see section 4.2), otherwise it may cause
unstable measurements or slow response.
⚫
Before getting readings or performing other operations, wait about 30 seconds after meter is
powered on.
