EC Oxygen sensor - 51101

Industry leading sensor with longest service intervals and lowest maintenance costs

Description

This electrochemical oxygen sensor is ideal for high-precision measurements under harsh
conditions. The measurement range varies from trace to saturation level (0.1 ppb to 400 pm).
Its concept and precise mechanical assembly ensure an optimal performance, a life cycle of
about 8 years and low maintenance costs.
This Oxygen sensor is based on a Clark Cell and consists of a semipermeable membrane, gold and silver electrodes immersed in an electrolytic solution. The membrane houses the electrolyte and acts as the barrier to thesample allowing only small molecular gases to passthrough to contact the goldcathode and react. A silver guard ring ensures the accuracy of reading byeliminating the effect of any oxygen dissolved in the electrolyte contacting the cathode and therefore creating an additional signal

Only the oxygen directly above the cathode permeates through the membrane and is measured. Oxygen molecules permeate through the membrane and enter the cell where it is reduced at the Gold cathode. The cathode reacts as a catalyst and therefore remains untarnished. Hydroxyl ions (OH-) are formed by the reduction of the O2 molecule and a current is generated. The current is directly proportional to the partial pressure of the O2 present. This current is then measured and displayed bythe instrument.

Membrane	Utilization of various membranes according to measuring range
Membrane model number	82956	82952	82935
Measuring range DO2	0.1ppb – 20ppm	1ppb – 100ppm	10ppb – 400pm
Measuring range PO2	0.4 bars	0 – 2 bars	0 – 10 bars
Flow rate liquids	180 ml/min	50 ml/min	25 ml/min
Flow rate linear flow	200 cm/sec	30 cm/sec	20 cm/sec
Flow rate Gaseous	0.005 – 3 l/min	0.005 – 3 l/min	0.005 – 3 l/min
Response time (90% at 25°C)	7.2 sec	38 sec	2.5 min
Accuracy	1% of the measured value or lowest value whichever is greater Absolute zero and low drift
Temperature compensation	0°C to + 50°C / 32°F to 113°F
Pressure rating	300 bars or 4350 Psi
Weight	0.6 kg
Enclosure protection	IP65
Material in contact with sample	ANSI 316L, PFA or Tefzel
Sensor model number	Model 51102: Ø25mm - Model 51101: Ø28mm
Sensor cable	3m standard length / optional extension up to 1000 m

Benefits
• Detection limits < 0.1 PPB (dissolved) or 0.5 PPM (v/v) gaseous
• Low maintenance costs: o Interchangeable anode/electrode: can be changed in few minutes at low cost
o Minimal membrane surface in contact with the sample reduces maintenancefrequency
o Large anode surface: the anode is less quickly consumed by the electrochemicalreaction and must thus be changed less frequently
• Easy calibration process (only 1 point needed): an Eeprom stores the calibrationparameters and avoids recalibration process if the sensor is connected to another Dextens instrument
• Temperature sensor is integrated in the cathode assembly, enabling a faster temperature reading
• Protection cap with special surface treatment: the sensor is very hygienic (certification EHEDG)
• Stainless steel construction: ideal for harsh chemical conditions and high pressures