January 2008
1-2 General Information
Basic Features (cont.)
Figure 1-1: The XDP
System Overview In a binary gas mixture, the transmitter measures the concentration of
a target gas in a known background gas (see the documentation for
the transmitter for a discussion of the specific technology employed
by the sensor mechanism). To be suitable for use in an XDP system,
the transmitter must meet the following requirements:
• powered by the +24 VDC output from the XDP
• output a 4-20 mA signal to the XDP analog input
• meet all performance specifications for the system
• suitable for use in the specified environment
The XDP accepts the 4-20 mA analog input from the transmitter and
processes the information. Then, the results are displayed on the
built-in digital display window. In addition, the data may be output as
a linear analog signal to drive a data recorder and/or controller device.