MAINTENANCE FOR AREARAE STEEL
7-5
7.4 Sensor Replacement
The toxic, combustible and oxygen sensors all have an
expected operating life. Under normal operating conditions,
most sensors lose their original sensitivity after the expected
operating life and will need to be replaced.
Each sensor module in the AreaRAE Steel includes a non-
volatile memory, which records the manufacturing date of the
sensor. The microprocessor checks the date code and display
the expiration date of each sensor. It is suggested that the user
should replace the sensor when the current date exceeds the
expiration date of a sensor.
Sensor Replacement Procedure
The oxygen and combustible sensor each has a unique sensor
socket in the AreaRAE Steel. The two toxic sensor sockets
allow plugging in any two sensors selected from the series of
toxic sensors offered by RAE Systems Inc.
1. Turn the AreaRAE Steel off.
2. Remove the battery pack. (See Section 3.2: Interchange-
able Battery Packs.)
3. Open the monitor housing by removing the six hex screws
that hold the housing together.
Figure 7-2
Housing hex screw
