UK Atmospheric sensors Metal Oxide Sensor Management System - AS330

I.Metal Oxide Sensor Management SystemAS330 Description:

In the case of metal oxide sensor technology, an upgrade uses AC instead of DC to power the sensing material.

This method provides complementary atmospheric composition information from the real and imaginary parts of the sensor impedance, and introduces significant enhancements in sensitivity and selectivity.
The SMS is designed to be used with 8 metal oxide gas sensors. It has circuits that precisely control the sensor heating temperature based on a digital control loop. Individual sensor heater 0°C resistance and temperature coefficients can be set, and there are many heater parameter setpoint algorithms to choose from.

This includes temperature ramps, time-temperature profiles, and can be controlled via an external RS485 interface. The temperature setpoint algorithm can be set to dual or can be subordinated to the first unit if needed. The SMS unit tests the sensing element impedance, which applies a controllable synthesized sine wave to a divider consisting of a top resistor (selectable between 100KΩ and 1MΩ via jumpers on the board) and the sensor: the sensor resistance is displayed by the PC monitoring software and is the quadrature component of the test.

II. Metal Oxide Sensor Management System AS330 Parameters:
4 or 8 MMO sensor channels, wide range of MMO sensor configurations
Digital control of heater temperature with suitable algorithms and many heater temperature configurations to aid selectivity
Real and imaginary sensing element impedance testing
Wide range of sensor applications for sensing selected gases
Multiple interface options including CAN, RS485, and RS232
Supply with appropriate power, 12V power supply
Reliable PC monitoring software, or allows users to write their own interface software