Part Five – Technical Information
Part Five – Technical Information
Power:
120V AC units: 60 Hz, Current 60 mA max.
Sensor:
Sensor calibrated at 150 ppm (±25 ppm).
Temperature:
Operating range: 40˚F (4.4˚C) to 100˚F (37.8˚C).
Mounting:
Power Cord:
#8 Philips panhead screw with plastic anchor.
Hardwire:
2, #8 Philips panhead screws with mounting plate.
Direct Plug-In:
No mounting screws needed.
Alarm:
85+ dB at 10’ @ 3.4 ± 0.5 KHz pulsing alarm. In alarm
condition you will hear 4 quick beeps, 5seconds off, 4 quick
beeps, repeat.
LED Operation:
Blinking dot denotes normal operation.
Digital readout 30-999.
Unit Malfunction:
“Err” error message will display. Intermittent alarm will
sound every 30 seconds and display dot will stop blinking.
Refer to page 1-12 for other “Err” conditions.
Test/Reset Button:
Test button verifies proper unit operation and resets the
unit in the event of a CO alarm.
Peak Level Memory Button:
When pressed, LED will display the highest CO ppm level
detected since unit was powered up or since unit was reset
with test button. Reading will be stored in memory as long
as unit is not reset or unplugged. Any concentration detected
from 0-999 will be displayed.
Size:
5.6”L x 3.2”W x 2.0”H. Wt. 1.1 lbs.
Housing:
Rigid plastic case meets UL94-5V rating.
Warranty:
Five-year warranty from date of purchase against defects in
material and workmanship.
How the Unit Determines When to Alarm
Your Nighthawk CO alarm uses advanced technology to monitor the
environment in your home and warn you of unacceptable levels of
carbon monoxide. An internal microcomputer works together with
the carbon monoxide sensor inside the CO alarm to determine the
levels of carbon monoxide in the air and to calculate the rate that CO
would be absorbed into the human body.
The microcomputer is calibrated to trigger the unit’s alarm before
most people would experience any symptoms of carbon monoxide
poisoning. Because carbon monoxide is a cumulative poison, long-
term exposures to low levels can cause symptoms, as well as short-
term exposures to high levels. Your Nighthawk CO alarm has a
time
weighted alarm
, so the higher the level of carbon monoxide pre-
sent, the sooner the alarm will be triggered.
This Nighthawk CO alarm meets the alarm response time
requirements of UL Standard 2034 which are as follows:
At 70 ppm, the unit must alarm within 60-240 minutes.
At 150 ppm, the unit must alarm within 10-50 minutes.
At 400 ppm, the unit must alarm within 4-15 minutes.
WARNING:
This device may not alarm at low carbon monoxide levels
(see chart above for alarm points). This product is intended for use in
ordinary indoor locations of family living units. It is not designed to
measure compliance with Occupational Safety and Health
Administration (OSHA) commercial or industrial standards. Individuals
with medical problems may consider using warning devices which pro-
vide audible and visual signals for carbon monoxide concentrations
under 30 ppm.
Accuracy of the Digital Display
Each Nighthawk CO Alarm is calibrated at a CO concentration of 150
ppm (+/- 25 ppm) in air, at 80˚ F (+/- 10˚ F) and 40% (+/- 3%) relative
humidity. Depending on the ambient condition (temperature, humidity)
and the condition of the sensor, the alarm readings may vary.
The digital reading tolerances are:
Ambient:
80˚ F (+/- 10˚ F), atmospheric pr/- 10%, 40% +/- 3%
relative humidity.
Tolerance
Reading
(of displayed reading)
0-999 ppm
± 20% + 15 ppm
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810-1009 AC Digital 11/13/01 11:22 AM Page 32
