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using the UP and DOWN buttons. The standard available sensor units
are as follows: PPM, %LEL, %VOL, and MGM.
For the user defined sensor units option, the user must use the UP or
DOWN buttons to cycle through the alphanumeric characters, pressing
the UP and DOWN buttons simultaneously will toggle between
uppercase and lowercase characters. Press the SELECT button, when
the display shows the desired character, to accept that character. To
leave spaces, select the <SPACE> character and press the SELECT
button. When the SELECT button has been pressed the next character
on the right will be displayed. To accept the sensor units’ description
the user must press the MENU button.
2.3.5. Set Alarms
The user is prompted to select the desired alarm number and therefore
must press the UP and DOWN buttons to display the desired alarm
number and then press the SELECT button to accept that alarm
number.
2.3.5.1. Set Alarm Level
This option will allow the user to change the alarm point level. The
alarm point level will increase or decrease in steps of 1 if the UP or
DOWN buttons are held down for less than 10 seconds. If the buttons
are still held down then the alarm point level will increase or decrease
in steps of 10 for the next 20 seconds. If the buttons are still held down
the alarm point level will increase or decrease in steps of 100.
When the desired alarm point level is displayed, the user must press
the SELECT button to accept the displayed value.
2.3.5.2. Set Alarm Type
This option allows the user to specify a rising alarm (+) or a falling alarm
(-). A rising alarm will activate if the gas concentration rises above the
alarm set point whereas a falling alarm will activate if the gas
concentration falls below the alarm set point. The UP and DOWN
buttons are used to toggle between rising and falling alarms. To accept
the alarm type the user must press the SELECT button.
2.3.5.3. Set Alarm Delay
This option allows the user to specify a delay time, in seconds, from
when the gas concentration level has exceeded the alarm set point
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