Sierra Monitor Corporation 4501-05 - Manual (Page 13)

Model 4501-XX Toxic Gas Sensor Module
Page 9 of 35
Figure 5 - 1: Face Plate with Operator Keypad
5. OPERATION
5.1 INTRODUCTION
The 4501-XX Toxic Gas Sensor Module utilizes a visual menu system operated by means of a magnet with
the cover in place. A magnet stick is supplied for this purpose. Access the menu system to calibrate the
sensor module, and for maintenance and diagnostic procedures.
The following adjustments can be made to the sensor module:
 Range adjustments (see section 5.4)
 4mA and 20mA calibration adjustments (see section 5.4)
 Span adjustment (see section 6.3)
5.2 DATA ENTRY KEYPAD
The module menu system is operated by means of directing the magnet stick toward each of four independent
hall-effect magnetic switches. Each switch functions as if it is a manually activated panel key. The keys are
located under the faceplate above and below the LCD and are labeled
M , E ,  and  as shown in
Figure 5-1.
• Key : MODE
• Key ENTER
• Key : UP (+)
• Key : DOWN (-)