325.6610.17 - 42 -
• Press ENTER to enter the ZERO menu.
• Use the RIGHT ARROW button to step to the appropriate selection
for the calibration gas sample: either humid or dry if calibration is to
be performed or omit if no calibration will be performed.
• Press ENTER to select the entry
• Use LEFT ARROW button twice to return to the CHANNEL 1
submenu.
4.3.3.5 Configure Alarm
• Use the RIGHT ARROW button to scroll or step to the ALARM1 sub
menu.
• Press ENTER to enter the ALARM1 menu.
• Press ENTER to enter the LEVEL submenu.
• Using the numeric keys on the keypad, enter the value of the gas con
centration threshold (in ppm) where the alarm is to occur. For example,
if it is desired to have an alarm occur at 100 ppm, enter 100 using the
keys on the keypad. If an incorrect entry is made, the LEFT ARROW
may be used as a ‘backspace” key. The selected alarm level must be
within the sensor range selected, otherwise the “over-range” alarm will
supercede the level alarm.
• Press ENTER to accept the alarm level entry.
• Use the RIGHT ARROW button to step to the desired MODE selection
(INST, STEL,TWA, or CUSTOM). This selection determines the time-
base criteria the unit uses to generate an alarm based on the value of
the entry in the LEVEL submenu. The alarm modes are defined as
follows:
INST - Instantaneous, generates alarm as soon as gas
concentration exceeds concentration alarm level.
STEL - Short term exposure limit, 15-minute time weighted
average of measured gas concentration
TWA - Time weighted average, 8 hour average of measured gas
concentration
CUSTOM - Allows customer to provide his own time-base to
perform a customized time weighted average up to an average
over 24 hours.
• Press ENTER to accept the alarm mode entry.
• Use the RIGHT ARROW button to step to the LATCH submenu.
• Press ENTER to enter the LATCH menu.
• Use the RIGHT ARROW button to select either YES, or NO.
YES- Once an alarm condition occurs, the alarm status will be
“latched” or non self-resetting.
NO- Alarm status self-resets. When the alarm condition clears,
normal operation will resume.
• Press ENTER to accept the desired alarm latch entry.
• Use the RIGHT ARROW button to step to the DELAY submenu.
• Press ENTER to enter the DELAY submenu.
• Using the number keys, enter a value (in seconds) of how long the
receiver is to wait to signal an alarm situation has occurred, up to a
maximum of 255.
• Press ENTER to accept the alarm delay entry.
• Press LEFT ARROW three times to return to the CONFIGURE menu.
Follow the same procedure for configuring the ALARM 2 and ALARM3
parameters. Remembering that:
ALARM1 LEVEL < ALARM2 LEVEL < ALARM3 LEVEL
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