N
2
O Portable Monitor
Operation
Instruction 3015-4787
9
3.5 Peak Reading Operation
In addition to displaying the current N
2
O level, the monitor can also be set up to display its peak ppm
measurement.
The peak reading display is selected by using the
2ndUNIT
function
(
page 13).
The display above shows that currently the monitor is detecting 100 ppm N
2
O and that a peak
measurement of 500 ppm has occurred.
The peak reading is reset by pressing the
ENTER
button.
3.6 Leak Detector Operation
The monitor can be configured to operate as a Leak Detector by setting the
AUDALRM
function (page 11)
to
LEAK DETECTOR
.
When configured as a Leak Detector, the monitor will produce a leak detector type of audible feedback. At
zero ppm there will be a tic every 2 seconds with the tic rate increasing up to 20 tics/second when the ppm
level reaches the
ALRMLVL
(page 11) setting.
3.7 Standby Mode
After becoming operational, the monitor can be placed into a Standby Mode. When taken out of standby
the monitor is ready for operation without waiting an additional 15 minutes to warm up. While in standby
the monitor will stop taking gas samples and stops purging itself from the purge-air bag.
Place the monitor into its Standby Mode by pressing both the
ENTER
and
ESC
buttons at the same time.
Take the monitor out of standby by again pressing both the
ENTER
and
ESC
buttons.
When the monitor is taken out of standby the operator must refill the purge-air bag by pressing the
ENTER
button. Refilling the bag after coming out of standby re-establishes the monitor’s ambient
pressure reading and ensures that the purge-air bag is filled at the start of taking gas measurements.
WARNING:
Fill the purge-air bag in a clean, fresh-air environment that is at the
same temperature and humidity as the area being checked for gas. DO NOT fill the
bag in an area that is contaminated with N
2
O gas.
.
As soon as the purge-air bag has been refilled with fresh air, the
Data Display
screen appears and the
monitor resumes normal operation.
PURGE 500pk
100ppm N2O
STAND BY
PURGE AIR EMPTY
<ENTER> TO FILL
RECHARGING PURGE
AIR...
