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Microx Datasheet
Standard Issue User Manual
Zirconia Issue User Manual
Overview
The minimum output range of 0 to 10ppm is ideal for nitrogen generation or glove box monitoring. The Microx analyser can also be supplied with measuring ranges up to 0 to 96% O2 for oxygen concentrators. The flexibiliy is further enhanced by different mounting options and multiple sensor types.
Features
- Zirconia or electrochemical sensor technology options
- 0-1000ppm, 0-10,000ppm, 0 to 25%, 0 to 96% O2
- M16 Threaded connection, flowthrough housing, flowthrough with orifice, Drellum T-piece connection options
- Din rail / Panel / Wall mounting options
- 3 configurable alarm relays
- RS 232 modbus protocol
- LCD + 4 button HMI
More details
Zirconia sensor
The Ntron zirconia oxygen sensor is a nondepleting zirconia solid electrolyte sensor. A small capillary on the sensor controls the diffusion of oxygen into the sensor. When heated to over 400°C oxygen is electronically reduced causing current flow through the zirconia electrolyte. Zirconiumoxide allows the movement of oxygen ions through the substrate from a high to a low concentration. The measurement of oxygen is determined by the current flowing through the electrodes. The zirconia sensor has an unlimited shelf life without the loss of calibration and has an expected life in excess of 5 years. The zirconia sensor is not position sensitive and has low cross sensitivity to other gases and does not dry out.
The Ntron zirconia oxygen sensor is a nondepleting zirconia solid electrolyte sensor. A small capillary on the sensor controls the diffusion of oxygen into the sensor. When heated to over 400°C oxygen is electronically reduced causing current flow through the zirconia electrolyte. Zirconiumoxide allows the movement of oxygen ions through the substrate from a high to a low concentration. The measurement of oxygen is determined by the current flowing through the electrodes. The zirconia sensor has an unlimited shelf life without the loss of calibration and has an expected life in excess of 5 years. The zirconia sensor is not position sensitive and has low cross sensitivity to other gases and does not dry out.
Electrochemical sensor
The key elements of the electrochemical sensors are a membrane, cathode, anode, electrolyte and measurement circuit. The sensing membrane (covering the cathode) is made of PTFE and is mounted over a metal perforated electrode. The space between the membrane and the electrode is filled either with an aqueous alkaline or an acid electrolyte. In normal operation, all portions of the anode and cathode are immersed in the electrolyte. As oxygen diffuses through the membrane into the electrolyte it causes a reaction between the cathode and anode generating an EMF. This current is proportional to the amount of oxygen present in the sample gas. In the absence of oxygen there is no output from the electrochemical sensor, meaning only one calibration is required.
The key elements of the electrochemical sensors are a membrane, cathode, anode, electrolyte and measurement circuit. The sensing membrane (covering the cathode) is made of PTFE and is mounted over a metal perforated electrode. The space between the membrane and the electrode is filled either with an aqueous alkaline or an acid electrolyte. In normal operation, all portions of the anode and cathode are immersed in the electrolyte. As oxygen diffuses through the membrane into the electrolyte it causes a reaction between the cathode and anode generating an EMF. This current is proportional to the amount of oxygen present in the sample gas. In the absence of oxygen there is no output from the electrochemical sensor, meaning only one calibration is required.
Low maintenance and cost of ownership
Due to the highly stable nature of the sensor, a calibration interval of once per year is required. The construction of our zirconia oxygen sensor means that only 100 mL/ min of sample gas is required, providing further potential cost savings.
Proven sensor technology
With a choice of either zirconia or electrochemical sensor technology the Microx offers reliability, accuracy and flexibility. Both technologies have a broad measurement capability allowing the user to measure from 1ppm to 96% oxygen.
Fast response time
Zirconia oxygen sensors respond very quickly to oxygen concentrations in both directions with a T90 of less than 10 seconds within a set range.
Due to the highly stable nature of the sensor, a calibration interval of once per year is required. The construction of our zirconia oxygen sensor means that only 100 mL/ min of sample gas is required, providing further potential cost savings.
Proven sensor technology
With a choice of either zirconia or electrochemical sensor technology the Microx offers reliability, accuracy and flexibility. Both technologies have a broad measurement capability allowing the user to measure from 1ppm to 96% oxygen.
Fast response time
Zirconia oxygen sensors respond very quickly to oxygen concentrations in both directions with a T90 of less than 10 seconds within a set range.
Applications
- Gas generation (oxygen / nitrogen)
- Additive manufacturing
- Glove box purge and leak detection
- Industrial gas applications
Technical Specifications
| Performance | ||
|---|---|---|
| Measurement Technology | Zirconia (ZR) | Electrochemical (EC) |
| Measurement Range | 0 to 1,000ppm / 0 to 10,000ppm / 0 to 25% / 0 to 96% |
0 to 1,000ppm / 0 to 25% / 0 to 96% |
| Output resolution ( for %) | 0.01% | |
| Output resolution (for ppm) | 1ppm | |
| Accuracy | +/-2% of reading (or 2ppm O2) @ calibrated temperature and pressure | |
| Response time (T90) | <10 seconds @ 25˚C (within selected range) | |
| LDL (Sensitivity) | 0.01% (when measuring %) / 1ppm (when measuring ppm) | |
| Temperature range | -20˚C to +50˚C | 0˚C to +45˚C |
| Pressure range | 900 to 1100 mBarabs | |
| Linearity | 1% of range | |
| Life expectation | 3-5 years | 1 year |
| Humidity | 0-95% RH non-condensing | |
| Shelf life | No shelf life | Up to 6 months |
| Electrical Input / Output | ||
| Power supply | 24VDC ±10% / (230VAC Panel & Wall mounted options only) | |
| Power consumption | Maximum 160mA @ 24VDC | |
| Signal output | 4-20mA Output Linear & Logarithmic (User Configurable) | |
| Digital communications | RS232 bi-directional Modbus protocol. | |
| Digital output options | 3 off relay, dry contact 5 Amp rated | |
| Display format | % O2 / ppm O2 | |
| Display | 100 x 33 dot graphics display module | |
| Mechanical Specifications | ||
| Dimensions | Din Rail: 86mm (h) x 69mm (w) x 58mm (d) Wall Mount: 45mm (h) x 110mm (w) x 93mm (d) Panel mount: 96mm (h) x 96mm (w) x 83mm (d) |
|
| Weight | <0.180kg | |
| Wetted materials | Aluminium, PTFE, Viton | |
| Process connection | M16 Threaded connection / Flowthrough Housing / Flowthrough with orifice / Drellum T Piece | |
| Mounting | Din Rail (M36) / Panel / Wall | |
| Ingress protection | IP20 | |
| Housing material | ABS | |
| Certification | Complies with EMC Directive 2004 / 108 / EC. UL/ETL Certification Number: UL-61010-1 | |