GasWatch 3 for CO and O
2
Appendix A: Maintenance Mode • 79
Appendix A: Maintenance Mode
Overview
This appendix describes the GasWatch 3 in Maintenance Mode. The GasWatch 3 is factory-set
to suit most applications. Update settings in Maintenance Mode only if required for your
specific application. Maintenance Mode items and their factory settings are listed in Table 11
below.
Table 11: Maintenance Mode Menu Items
Maintenance
Mode
Menu Item
Description
GAS CAL (pg.82)
Perform an air adjust, perform a span adjustment, change the calibration values.
AIR
Perform a fresh air adjustment.
A-CAL or
E-CAL
depending on
E-CAL
User
Mode setting
Perform a span adjustment and set the calibration gas concentration.
A-CAL (or
E-CAL)
Perform an automatic span adjustment.
START
Begin the warmup sequence and enter Measuring Mode.
CAL-P
Set the calibration gas concentration.
CYL SEL
Assign a cylinder (A-E) to each gas. CO and O
2
are
assigned to Cylinder A by default.
ESCAPE
Return to the
A-CAL
item in the
GAS CAL
menu.
ESCAPE
Return to the
GAS CAL
item in Maintenance Mode.
GAS.TEST
(pg.82)
Apply gas to test sensor response and observe alarm indications without an alarm event
being recorded.
SEN.DATE
(pg.83)
View and/or set the replacement date for the sensor and the battery.
BUMP (pg.84)
Perform a bump test.
LATCH (pg.84)
ON
(factory setting): The GasWatch 3 remains in alarm until the alarm condition passes
and
POWER/MODE is pressed.
OFF
: The GasWatch 3 automatically resets an alarm when the alarm condition passes.
D.ZERO (pg.85)
ON
(factory setting): You can manually perform a fresh air adjust in Measuring Mode by
pressing AIR.
OFF
: You cannot manually perform a fresh air adjust in Measuring Mode by pressing
AIR.
A.ZERO (pg.85)
ON
: The GasWatch 3 asks if you want to perform a fresh air adjustment at the end of the
startup sequence.
OFF
(factory setting): The GasWatch 3 does not ask if you want to perform a fresh air
adjustment at the end of the startup sequence.
