Operation
N
2
O Portable Monitor
16
Instruction 3015-4787
3.11 Working with the Gas Alarm
3.11.1 Gas-Alarm Light
If the detected gas level reaches the gas-alarm level as set by the
ALRMLVL
function, the front panel
ALARM
(red) light will flash and the audible alarm, if activated (refer to
AUDALRM
function on page
11), will start beeping. The
ALARM
light and audible alarm will automatically turn OFF once the
detected gas level drops below the gas-alarm level.
3.11.2 Silencing a Gas Alarm
Pressing the
SILENCE
button while the alarm circuit is activated causes the audible alarm to turn OFF
for a period of time as set by the
SILENCE
function (page 12). The front panel
ALARM
light will continue
to flash as an indication that an alarm condition still exists. At the end of the silence period if the detected
gas level is still above the gas-alarm level the audible alarm will reactivate.
3.12 Clearing the PPM & Faults Data
Up to 200 gas measurements and 30 fault events are stored by the monitor.
To clear stored data, first display the data to be cleared by selecting the
PPM LOG
or
FAULTS
function
per Section 3.9.4. Next, press both the
ENTER
and
Keypad Right
buttons at the same time. A single,
long tone should be heard when the data has been successfully cleared.
3.13 Working with the DIAG Function
3.13.1 Overview
The
DIAG
function displays sensor data and status information useful to a service technician for
troubleshooting various fault conditions. Explanations of the data shown in these screens are given below.
3.13.2 Keypad Functions
From the
Data Display
screen, press any one of
the
Keypad
buttons to display the first
Function Menu
screen. Next, use the
Keypad
buttons to move the arrow (>) until it is next to the
DIAG
function, and
then press
ENTER
to display the first of two
Diagnostic
screens.
Press the
Keypad
Up
button to toggle between the
First
and
Second
Diagnostic
screen.
