Pulsar Model 22 User Manual 
Page 10
How the dosemeter works
The dosemeter is controlled by the Reader unit through an Infrared link. The link 
between the dosemeter and the Reader is used to send information in a similar way to 
a television remote control.  
The RK1 Keyfob also provides a method to start and stop the dosemeter without using 
the Reader unit. 
Each dosemeter contains a rechargeable battery which powers the unit throughout the 
measurement period. Each charge of the battery is designed for one measurement.  
The battery contains sufficient power to carry out a single measurement for over 20 
hours although the dosemeter will run for much longer provided the battery is fully 
charged. 
Please note that although the MODEL 22R Reader unit can be used to control 
the previous MODEL 20 and MODEL 20-TH dosemeters, if the user attempts to 
program an older dosemeter with a configuration that is not supported, an 
error message will be displayed when the dosemeter is reset or data is read  
    from the dosemeter.