Products Catalog

Specification

The DO 9709 Dissolved Oxygen - 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 temperaturesensor, 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 Pt100 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 fi sh breeding establishments, purifi cation plants, for the environmental control of waters and finally for laboratory measurements: in the medical, biochemical, microbiological fi eld and in the food industry.
TECHNICAL CHARACTERISTICS DO 9709
* Display: double LCD 31D2 digit, fi gure height 12.5 mm. and symbols.
* Instrument conversion frequency: 2 per second.
* Instrument working temperature: -5...+ 50° C, 0...90% R.H., no condensation.
* Storage temperature: -20...+ 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/ l
Resolution: 0.01 mg/ l in the range 0.00 to 19.99 mg/ l 0.1 mg/ l in the range 20.0 to 90.0 mg/ l automatic change of scale
Accuracy of instrument alone: ± 0.03 mg/ l in condition 60 to 110% , 1013 mbar, 20 to 25° C
Temperature probemeasuring range: 0 to 45° 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 probemeasuring range: 0 to 45° C
Temperature measurement with the sensor inside the Oxygen probe( input A)
Measuring range: 0 to 45° 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 45° 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 45° 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 45° C
Setting water salinity
Setting range: 0.0 to 70.0g/ 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, TP 870A, TP 870/ C, TP 870/ P ( Pt100 sensor with amplifi cation 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.

ORDER CODES
DO 9709: Diplomatic carrying case, instrument DO 9709, manual, 9V alkaline battery, temperature probe TP 870, connecting cable CP RS 232C and software DELTALOG-1, calibrator DO 9709/ 20, electrolyte solution for O2 DO 9701 and zero solution DO 9700. The probe for measuring dissolved Oxygen must be ordered separately.
Probes and connecting cables
DO 9709SS: Combined probe for measuring dissolved Oxygen and temperature with possibility of changing the membrane. 3 membranes. Cable length 2 metres.
DO9709 SS.5: The kit includes: combined probe for measurement of O2 and temperature, replaceable membrane, Ø 12mm x Ø 12mm. Cable lenght 5m, three membranes.
DO9709 SS.10: The kit includes: combined probe for measurement of O2 and temperature, replaceable membrane, Ø 12mm x Ø 12mm. Cable lenght 10m, three membranes.
TP 870: Immersion temperature probe, diam. 3x230 mm., measuring range -50...+ 400° C.
TP 870P: Penetration temperature probe, diam. 4x150 mm., measuring range -50...+ 400° C.
TP 870C: Contact temperature probe, diam. 5x230 mm., measuring range -50...+ 400° C.
TP 870A: Air temperature probe, diam. 4x230 mm., measuring range -50...+ 250° C
CP RS 232C: Connecting cable from SUB D female 9-pole to SUB D female 9-pole, for serial output RS 232C.
The temperature probes must be ordered separately. The instrument may be fi tted with all probes in the TP 870... series or with any type of Pt100 probe by other manufacturers as long as they have 4 wires and comply with the diagram.