Operation
N
2
O Portable Monitor
12
Instruction 3015-4787
•
ALARM/FAULT
– Alarm sounds when either the detected gas level exceeds the ALRMLVL value, or if
a system fault occurs, as evidenced by the front panel ALARM (red) light or FAULT (yellow) light
turning ON.
•
LEAK DETECTOR
– When selected, 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 setting.
•
TWA ALARM
– Audible alarm sounds when the TWA or twa, whichever is selected by the
2ndUNIT
Function
, exceeds the ALARMLVL value.
The audible alarm can be temporarily silenced by pressing the
SILENCE
button (page 12).
PPM LOG
– Contains records of the last 200 measurements. Each
record shows the measurement’s date, time, and ppm level.
Measurements are logged at an interval determined by the
LOG INT
function. After all 200 locations are filled the newest entries overwrite
the oldest entries.
Use the
Keypad
Up
and
Down
buttons to change the record number by
a factor of 1. Use the
Right
and
Left
buttons to change the record
number by a factor of 10. Press
ESC
to return to the previous screen.
To the right, record #025 shows that a gas level of 7 ppm was measured
on 07/11/05 at 15:35.
The PPM Log can be cleared per Section 3.11.
LOG INT
– Sets the interval at which measurements are logged to
memory from 1 to 9999 minutes. Factory default is 1 minute. The logged
measurements can be viewed using the
PPM LOG
function. Use the
Keypad
to enter the desired value, and then press
ENTER
to save that
value and return to the previous screen.
FAULTS
– Contains records of the last 30 fault events. The most recent
event is displayed when the
Fault
screen is first displayed. After 30
events have been recorded, the newest record overwrites the oldest. Each
record lists an event’s numeric fault code (refer to Section 3.10) plus the
date and time at which the event occurred. Use any of the
Keypad
buttons to scroll through the other fault events. Press
ESC
to return to
the previous screen.
To the right, record #15 shows that a Purge Flow Fault (fault code
<1000>) occurred on 07/11/05 at 12:37.
DIAG
– Enters the diagnostic function. Refer to Section 3.13.
SILENCE
– Sets the length of time the internal audible alarm is turned
OFF when the front panel
SILENCE
button is pressed. The factory default
is 30 seconds. If the cause of the gas-alarm has not been cleared at the end of
this time period, the internal audible alarm will reactivate. Use the
Keypad
to enter the desired time period, and then press
ENTER
to save that value
and return to the previous screen.
#025 7PPM @
07/11/05 15:35
LOG INTERVAL IS
0001 min
4.2159v <0000>
29.05cD 14.58psi
SILENCE TIMEOUT
0030 sec
#15 <1000> @
07/11/07 12:37
