Qubit Systems Inc. » dO2 probes

D904 Galvanic Dissolved O2 Probe for Aquaculture

MK — Tue, 08 Jun 2010 19:39:52 +0000

D904 is a rugged oxygen probe from Oxyguard. It has a build-in temperature sensors and 4-20 mA transmitter for data acquisition. It is designed for monitoring fish tanks without a need for a local display or a meter. A calibration screw in the side permits the 4-20 mA to be calibrated to correspond to the desired range of oxygen concentration. Includes also a Pt100 temperature sensor with its own 4.20 mA transmitter.

Dimensions	Diameter 58 mm, Length 88 mm
Weight	Approx. 600 g including cable
Measurement Principle	Galvanic cell, self polarizing, self temperature compensating
Operating Conditions	0-50^oC, pressure to 2 bar
Flow Requirements (in water)	Minimum flow dependent, typically 1 cm/sec
Loop power Supply	Depends on loop impedance. 24 VDC recommended
Input/output Isolation	1000 V RMS input/output
Range	0-400% air saturation

Extremely high stability – zero adjustment is never needed, calibration seldom
No regular maintenance needs. The robust membrane, 50 μ thick, is easily cleaned, but if damaged can be replaced by anyone – at negligible cost
Correct measurements with flow as low as 1 cm/s
Based on a chemical principle superior of that of traditional DO probes
Galvanic type – True zero
Build-in temperature compensation
7 m cable

Probe includes Maintenance kit (D904-KIT):

10 spare membranes
Polishing pad
50 ml electrolyte fluid.

D902 Micro Galvanic Dissolved O2 Probe

MK — Tue, 08 Jun 2010 19:30:21 +0000

The D902 Micro Galvanic Oxygen Probe is extremely small for telemetry or other applications where a small size or low oxygen self-consumption is paramount.

Dimensions	Diameter 12mm, Length 27mm (OEM version length 18 mm)
Type	% oxygen saturation
Output	c. 20 mV at 100% oxygen saturation, output impendance is c. 2-3 kOhm
Flow Requirements	Typically 1 cm/sec, depending on oxygen and temp
Cable	30 cm, other lengths available on request
Measuring Range	0-200 % air saturation
Measuring Depth	<200m
Temperature Range	0-35^oC
Accuracy	Typically better than +/- 1% of measured value, depending on calibration accuracy
Repeatability	Typically better than +/- 0.5% of measured value
Response Time	T90 (90% of end value) is <15 sec

Galvanic cell, no power supply needed
Built-in temperature compensation
Excellent long-term stability
Tough membrane can be wiped clean with a cloth
Probe does not need regular service or renovation.
Membrane replacement tool included

Optional maintenance kit (D902-KIT) includes 10 spare membranes, a pre-fitted membrane cap and 50 ml electrolyte fluid.

D901 Miniature Galvanic Dissolved O2 Probe

MK — Tue, 08 Jun 2010 19:18:31 +0000

The D901 is a small but rugged and very stable galvanic oxygen probe designed for fish respirometry and other laboratory applications. It can even be used for atmospheric measurements, e.g. air breathing animal respirometry. This probe is included in the D202 Oxygen Regulation system.

Dimensions	Diameter 15mm, Length 90mm
Type	% oxygen saturation
Output	c. 25 mV at 100% oxygen saturation, output impendance is c. 2 kOhm
Flow Requirements	Typically 1 cm/sec, depending on oxygen and temp
Cable	3 m, other lengths available on request
Measuring Range	0-200 % air saturation
Accuracy	Typically better than +/- 1% of measured value, depending on calibration accuracy
Repeatability	Typically better than +/- 0.5% of measured value
Response Time	T90 (90% of end value) is <20 sec

Galvanic cell giving a 0-25 mV output (no power supply needed)
Build-in temperature compensation
Excellent long-term stability
Tough membrane can be wiped clean with a cloth
Probe does not need regular service or renovation
Membrane replacement tool included

Optional maintenance kit (D901-KIT) includes 10 spare membranes, a pre-fitted membrane cap, a polishing pad and 50 ml electrolyte fluid.

D701 Polarographic O2 Electrode Probe

MK — Tue, 08 Jun 2010 18:56:38 +0000

The D701 polarographic oxygen electrode Probe is designed for laboratory use to provide fast, accurate, stable readings with easy maintenance.

The D701 is a polarographic O2 electrode Probe (identical in design to the E-5046 electrode from Radiometer) consisting of a combined platinum- and silver/silver chloride electrode mounted in an electrode jacket and covered by a 20 um thick membrane of polypropylene. A reservoir of phosphate buffer and potassium chloride is trapped inside the electrode.

When a polarizing voltage of approximately 630 mV is applied to the platinum cathode, a current proportional to PO2 will be generated by reduction of the oxygen diffusing towards the cathode.

Included supplies:

Electrode body & O-ring
Oxygen membranes (15/pkg)
Membrane O-ring (10/pkg)
Membrane mounting tool
Oxygen internal fill solution (electrolyte) (60 mL)
Rubber end cap

Required supplies (not included):

D607 Polarographic amplifier
Nitrogen gas or sodium sulfite (Na2SO3)
Distilled water, alcohol and lab wipes

Specifications:

Range	0 – 800 mm Hg
Response Time	30 – 60 sec. at 37^oC (99% response)
Oxygen Sensitivity	10-11 A / mm Hg PO2 (approx.)
Zero Current	Less than 3 x 10-10 A at 37^oC
Accuracy	Approx. 1%
Temperature Range	20 – 50^oC
Temperature Coefficient	Approx. 3% / oC when equipped with a 20 um polypropylene membrane
Reference Electrode	Silver/silver chloride
Membrane Material	Polypropylene, thickness 20 um
Electrode Solution	Phosphate buffer – potassium chloride
Plug type	BNC UG-88/u
Cable Length	1 m
Electrolyte Reservoir	Approx 0.8 mL

D607 Polarographic Amplifier

MK — Tue, 08 Jun 2010 18:11:28 +0000

The D607 Polarographic Amplifier has been specifically designed for low noise, precise amperometric measurements. The features of this research instrument easily permit the use of a wide range of commercial polarographic oxygen sensors. The D607 is a perfect amplifier for the D701 Oxygen Probe.

Low noise, precise polarographic amplifier
Able to be used with both oxygen and hydrogen sensors
Wide response range from 0.1nA to 1000nA
Excellent resolution to 0.1pA
Full scale digital panel meter display shows current, mmHg, mmHg x 10, %, or % x 10
Internal/external gatable electrode polarization
Single-ended or differential measurements possible

The wide response range of the D607 extends all the way from 100 pA up to 1 uA with 100% over range on all scales. On its most sensitive scale, the resolution is 0.1 pA. The amplifier output is displayed on the front panel digital meter, and is available from a BNC connector for chart recorders, polygraphs, A/D converters or other display devices. Accuracy, ease-of-use, and recording flexibility are design features for the researcher’s satisfaction. No head stage is required to achieve the 0.1 pA sensitivity, reducing the congestion at the electrode measurement site. The input connections are made conveniently through standard BNC connections. The front panel scale adjustment does not require zero current readjustment when there is a change in scale, reducing instrument set-up time. The digital meter display is switch selectable for mmHg, percent (x1 or expanded x10), or absolute current. The instrument gain automatically adjusts for polarity of the polarization voltage, even for an external polarization input.

The maximum input bias current is less than 1 pA at normal room temperature. With the 10-turn potentiometer knob, the Zero Current control can be used to eliminate this input bias current of the polarographic sensor at 0% oxygen. The Zero Current can be turned off to determine the absolute current level. This is a convenient way to check electrode resistance.

The amplifier offers two polarization voltage methods. One is from the instrument’s internal source set by the Internal Voltage knob; the other is from an external source into the Ext In BNC connector. A novel feature for the external source is that a variety of polarization waveforms may be used. The display meter can be switched to monitor the polarization voltage. The voltage can also be monitored via the Monitor Out BNC connector. An external GATE signal may be used to switch on or off the polarization voltage applied to the electrode, for further experimental control.

The D607 has been designed to minimize the effects of artifacts and noise. While for many applications a single-ended sensor input may be adequate, differential measurements may also be made. Built-in low pass and notch filters further reduce spurious noise. The instrument has features to withstand the rigors of a research environment, with protection against normal static or DC over voltages.

Oxygen response as recorded with polarographic amplifier:

Specifications:

Response:	100pA to 1 uA with 100% overrange
Resolution:	0.1 pA
Connections:	BNC
Set-up time:	no zero current readjustment required
Units:	mmHg, percent, promille, current
Bias current:	less than 1 pA at normal room temperature