S1 Oxygen Electrode Disc
Since its original design in the early 1970s by Tom Delieu and David Walker, the S1 Clark-type oxygen electrode disc remains largely unchanged – a true testament to the quality and reliability of the sensor. The S1 consists of a platinum cathode and silver anode set into an epoxy resin disc and is prepared for use by trapping a layer of 50% saturated KCl solution beneath an oxygen-permeable PTFE membrane. A paper spacer placed beneath the membrane acts as a wick to provide a uniform layer of electrolyte between anode and cathode.
When a small voltage is applied across these electrodes (with the platinum negative with respect to the silver), the current which flows is at first negligible and the platinum becomes polarised (i.e. it adopts the externally applied potential). As this potential is increased to 700 mV, oxygen is reduced at the platinum surface, initially to hydrogen peroxide H2O2 so that the polarity tends to discharge as electrons are donated to oxygen (which acts as an electron acceptor). The current which then flows is stoichiometrically related to the oxygen consumed at the cathode.
When connected to the electrode control unit, the S1 provides a fast, effective and accurate method of detecting small changes in oxygen concentration.
Oxyview Control Unit
The OXYV1 Oxyview control unit has been designed as a convenient, low-cost oxygen electrode control unit for teaching studies of photosynthesis and cellular respiration using the oxygen electrode measurement technique.
The Oxyview control unit is fully compatible with the range of oxygen electrode chambers produced by Hansatech Instruments thus allowing a wide range of different assays to be performed in both liquid and gas-phases.
The Oxyview is configured and controlled via a front mounted control panel featuring 4 touch-sensitive buttons. Configuration is achieved by navigating through a series of simple menu screens and following the displayed guidelines for each step of the setup process. These configuration steps include setting of the stirrer speed (for liquid-phase measurements) and back-off and gain settings. Once configured, the Oxyview control unit provides an accurate and stable reading of the oxygen content of the sample in question.
The Oxyview control unit is powered by a 12V DC wall cube which connects directly to the rear of the unit. Also at the rear is a 0V – 5V analogue output. This allows the measured values from the control unit to be logged to an external recording device such as a chart recorder or similar datalogger accepting a 0V – 5V analogue input.
Oxyview 1 systems are supplied with the following components:
- DW1/AD: Liquid-phase electrode chamber
- OXYV1: Electrode control unit
- A2: Membrane applicator to assist with smooth application of electrode membrane
- A3: Top plate key and alignment jig to dismantle and reassemble DW1/AD for cleaning
- S2/P: Pack of 5 magnetic followers
- S3: Pack of 2 replacement borosilicate glass reaction vessels
- S4: PTFE membrane (0.0125mm x 25mm x 33m)
- S7A: Replacement O-rings for electrode chamber
- S16: Cleaning kit for the S1 electrode disc.
Oxyview 1 electrode control unit
- Measuring range: Oxygen: 0% – 100%
- Signal inputs: Oxygen electrode (SMB)
- Resolution: 10 x 10-6 μmols/ml at 20°C
- Polarising voltage: Selectable between 0.4V – 0.9V (0.7V recommended default)
- Gain: Coarse: x1, x2, x5, x10, x20, x50, x100. Fine: 1mV steps
- Back off: Signal back off in 1mV steps
- Analogue output: 0V – 5V electrode signal
- Dimensions (HWD): 90mm x 135mm x 85mm
- Weight: 320g
- Power: 95V – 260V universal input mains supply. Output 12V DC 2.5A
DW1/AD electrode chamber
- Suitability: Liquid-phase respiration/photosynthesis
- Construction: Clear cast acrylic
- Sample chamber: Precision-bore, borosilicate glass tube
- Sample volume: 0.2ml – 2.5ml
- Temperature control: Water jacket connected to thermoregulated circulating water bath
- Dimensions (DH): 65mm x 105mm
- Weight: 100g
- Plunger: Gas-tight, variable-height plunger assembly with stoppered central bore for sample additions.
S1 oxygen electrode disc
- Electrode type: Clark-type polarographic oxygen sensor
- Electrode output: Typically 1.6µA at 21% O2
- Residual current: Typically 0.04µA in 0% O2
- Response time: 10 – 90% typically <5 seconds
- Oxygen consumption: Typically <0.015µmol/hr-1
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