DISSOLVED OXYGEN MEASUREMENT- DATA LOGGER

DO9709K Portable dissolved oxygen data logger. Dual LCD indication and symbols. Concentration of dissolved oxygen, saturation index of O2, temperature of O2 probe on input B. Atmospheric pressure compensation, salinity and temperature compensation. O2 + temperature probe on the input A, only temperature on the input B. Storage of maximum, minimum and mean values, storage up to 30,000 readings. Serial output RS232 C.
The DO 9709 Dissolved Oxygen Meter - Data Logger allows the measurement of the concentration 
(expressed in mg/l) of dissolved oxygen in liquids and of the saturation index (expressed in %), using a combined measurement of a polarographic type with two or three electrodes, and a temperature sensor inside the probe.
Normally the instrument measures the partial pressure of the oxygen in the water, measuring the current generated by the polarographic probe. The temperature sensor, contained in the oxygen probe, and the atmospheric pressure sensor housed inside the instrument allow calculation of the saturation index and of the oxygen concentration in the liquid being examined. The instrument contemplates automatic compensation of the membrane permeability, used in the oxygen probe, and of the salinity of the liquid being examined.
Temperature probes with a 4-wire Ptl00 sensor may be connected to the instruments, or active probes of series TP 870, for taking temperature measurements in the range from -50° to +200°C:

The fast calibration function of the dissolved oxygen probe guarantees lasting correctness of the measurements taken.
The instrument’s Data Logger function enables it to store up to 30,000 readings. The sampling period is variable from 1 second to 12 hours.

The data acquired may later be transferred to a Personal Computer or a printer by means of the opto-insulated serial line RS 232C.
For each value stored the date and time of acquisition is indicated; each acquisition block is ended with a report which provides the maximum, minimum and mean values.

With the Serial Output function it is possible to obtain the instantaneous values measured by the instrument at the output of the serial line RS 232C, in order to send them to a printer or a computer.
Other functions such as HOLD (which blocks the display), REL (for taking relative measurements) and RECORD (for storing the maximum, minimum and mean values) further enrich the instrument’s performance.

Thanks to its versatility and to its storage capacity, the instrument is particularly suitable for monitoring activities, for example in fish breeding establishments, purification plants, for the environmental control of waters and finally for laboratory measurements: in the medical, biochemical, microbiological field and in the food industry.

TECHNICAL CHARACTERISTICS DO 9709

-Display: double LCD 3 1/2 digit, figure height 12.5 mm. and symbols.
-Instrument conversion frequency: 2 per second.
-Instrument working temperature: 
-5°C...+50°C, 0.90% R.H., no condensation.
-Storage temperature: -20°C. +60°C.
-Power supply: 9V battery, lifetime with a good alkaline battery 100 hours (about 1 year with the instrument switched off).
-Connectors: input A and B, DIN 41524 female 8-pole circular connector, serial gate SUB D male 9-pole.
-Instrument case: ABS.
-Dimensions: instrument alone 210x72x40 mm, kit 370x295x85 mm.
-Weight: instrument alone 350 gr., kit 1600 gr.

*Measuring the concentration of dissolved Oxygen (input A)
-Measuring range: 0.00 to 90.0 mg/I
-Resolution: 0.01 mg/I in the range 0.00 to 19.99 mg/I, 0.1 mg/I in the range 20.0 to 90.0 mg/I automatic change of scale
-Accuracy of instrument alone: ±0.03 mg/I in condition 60 to 110%, 1013 mbar, 20 to 25°C
-Temperature probe measuring range: 0 to 50°C
*Measuring the saturation index of dissolved Oxygen (input A)
-Measuring range: 0.0 to 600.0 %
-Resolution: 0.1% in the range 0.00 to 199.9%, 1% in the range 200 to 600% automatic change of scale
-Accuracy of instrument alone: ±0.3% between 0 and 1999.9%, ±2% between 200 and 600%
-Temperature probe measuring range: 0 to 50°C
*Temperature measurement with the sensor inside the Oxygen probe (input A)
-Measuring range: 0.0 to 50°C
-Resolution: 0.1°C
-Accuracy of instrument alone: 0.2°C in the range 18 to 25°C, 0.2°C +0.01°C/°C in the range -5 to 18°C and 25 to 50°C
-Accuracy with NTC sensor: 0.4°C in the range 18 to 25°C, 0.4°C +0.015°C/°C in the range -5 to 18°C and 25 to 50°C
-Measurement of atmospheric pressure
-Measuring range: 600 to 1100 mbar
-Resolution: 1 mbar
-Accuracy of instrument alone: ±2 mbar in the range 18 to 25°C, ±2 mbar +0.1 mbar in the range -5 to 18°C and 25 to 50°C
-Setting water salinity
-Setting range: 0.0 to 70.0 g/l
-Resolution: 0.1 g/l
-Temperature measurement (input B)
-Temperature probe: Pt100 platinum probe (100 ohm at 0°C).
*Input for temperature probes of the series TP 870, IF 870A, TP 870/C, TP 870/P (Pt100 sensor with amplification and linearization circuit) or Pt100 4-wire probes with direct input.
-Instrument temperature measuring range: -50...200°C.
-Resolution: 0.1°C in the range -50.0...+199.9°C.