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3. DISPLAY FEATURES
J
C
D
A
B
Battery
A
Fail
B
Self-test pass icon
C
The Impulse XP LCD has a backlight that will operate automatically whenever
an alarm occurs, and also whenever any button is pressed.
4. GAS ALARMS
The Impulse XP has two levels of instantaneous gas alarms, of which the level
2 alarm is more urgent than the level 1 alarm. Impulse XP also has a 15
minute STEL alarm and an 8 hour TWA alarm. The alarm set points can be
set by the user on the instrument. It is supplied with the following default alarm
set points:
Gas Type
Level 1 Alarm
Level 2 Alarm
H
S
10 ppm
15 ppm
2
CO
35 ppm
100 ppm
O
23.5% v/v
19.5% v/v
2
For other toxic gases, see Section 21 Other Gases.
6
D
Level 1: O
and toxics
2
Level 2: Toxics
E
E
Level 2: O
2
F
G
F
STEL/TWA alarm
H
G
Cal. Status icon
I
H
Low peak (O
), High peak (toxics)
2
Gas concentration and units
I
Alarm icon
J
STEL Alarm
TWA Alarm
15 ppm
10 ppm
400 ppm
35 ppm
N/A
N/A
Alarm Level
Display*
Audible Alarm
blink
Level 1 alarm
3 beeps
per second
blink
Level 2 alarm
5 beeps
per second
blink
STEL alarm
5 beeps
per second
blink
TWA alarm
5 beeps
per second
* Examples shown for H
S
2
Note: When the detected gas level returns to a safe level the gas alarm will
stop, unless the alarm mode is set to latching. The user cannot cancel an alarm.
Note: If the measured reading exceeds the range of the sensor then the
numerical digits will flash the full scale value.
Visual Alarm
Vibrating
Alarm
3 flashes per
Once every
second
2 seconds
5 flashes per
Once every
second
2 seconds
5 flashes per
Once every
second
2 seconds
5 flashes per
Once every
second
2 seconds
7
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