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MAP Sensor - Designed For Sampling Systems, Using An External Heater

Supplier: Ceramic Oxide Fabricators (Australia)

The MAP sensor is used in sampling devices, such as modified atmosphere pacakging, analysis of welding gases or combustion controllers, where a heater maintains the sensor at 700°C.

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Specifications

1. Construction

The MAP sensor consists of a standard SIRO2 sensor bonded into a stainless steel head. The head incorporates two threaded tube connectors for gas in and gas out. Internal gas flow is via a stainless steel capillary and ceramic tube.

All components in direct contact with the gas stream are stainless steel or alumina ceramic.

MAP Sensor

2. Physical Dimensions
  • Sensor tube 8 mm diameter (6 mm available on special order), length to order.
  • Stainless steel head 20 x 20 x 35 mm.
3. Electrical
  • Fully isolated terminal block, connected to sensor inner and outer conductors.
  • The output is compatible with all zirconia-based oxygen analysers.
  • An internal platinum thermocouple is optional.
Installation

The sensor tip must be heated to a temperature of at least 700°C, in air. Position the sensor symmetrically in the hot zone of the heater. Check that the impedance of the sensor is less than 10 kohms and that the air-to-air signal is less than 2 mV.

Pump reference gas into the end connection and remove it from the top connection. The gas flow rate should be in the range 0.1 - 0.3 l/min.

The DC mV signal will then indicate the oxygen concentration, according to the Nernst equation.

 

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