Manual

C
ALIBRATION
A
periodic check of the system calibration is recommended.
T
o enter calibration mode, turn off meter and press the and the button
simultaneously for 2 seconds. For calibration, there are two options.
0 ppm Calibration:
P
lace meter in an area free of CO and enter calibration mode. The unit will calibrate
a
utomatically. The display will blink until calibration is complete. This takes about
1
0 minutes.
100 ppm/500 ppm Calibration:
After entering calibration mode, hold the button. 0,100, and 500 ppm will cycle
through on the bottom of the display. Release the button when preferred calibration
v
alue is reached. Place meter in sealed box filled with the selected calibration gas
s
tandard for 15 minutes. Check if the reading meets calibration standard. If it does
n
ot, repeat the procedure.
M
AINTENANCE
M
odel 450A-1 is not field serviceable and should be returned if repair is needed
(
field repair should not be attempted and may void warranty). Be sure to include a
b
rief description of the problem plus any relevant application notes. Contact
customer service to receive a return goods authorization number before shipping.
DWYER INSTRUMENTS, INC. Phone: [phone] www.dwyer-inst.com
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A. Fax: [phone] e-mail: [e-mail]
©Copyright 2013 Dwyer Instruments, Inc. Printed in U.S.A. 8/13 FR# R6-443742-00 Rev.2
ppm
0-1
9
25
35
50
100
200
400
800
1600
Symptoms and Applicable Standard
Normal background levels.
Maximum indoor air quality level; Maximum allowable concentration per
ASHRAE residential standards 62-1989 for living area.
Maximum limit of 8 hours of continuous exposure per California OSHA
workplace standards.
Maximum 8 hours of average exposure level per US OSHA workplace
standards.
Maximum concentration for continuous exposure in any 8 hours average
level per OSHA standards.
Remove employees from enclosed space if the CO concentration
exceeds 100 ppm per OSHA exposure limit.
Mild headache, fatigue, nausea, and dizziness within 2-3 hours.
Frontal headache, life threatening after 3 hours; Maximum concentration
in flue gases per the US EPA and AGA standards.
Dizziness, nausea, convulsions, death within 2-3 hours.
Nausea within 20 minutes, death within 2-3 hours.
LEVELS AND EFFECT OF CO
Problem
P
ower on but no display
Display disappears
Calibration failure
E 2
E 3
E
4
E
31
E
33
E 35
S
olution
• Verify that the time since power on has been over 300 mS.
• Verify that the batteries are in good contact with the correct polarity.
• Replace batteries with new batteries and try again.
• Determine if the low battery indicator is on the screen before
d
isplay disappears. If so, replace with new batteries.
•
Determine if the low battery indicator shows before calibration. If so,
r
eplace with new batteries and retry calibration.
• Verify that the standard gas is correct.
• The value is underflow.
• The value is overflow.
• The value is in error because of the original data.
•
A/D failure. Return meter for repair.
•
Measurement circuits failure. Return meter for repair.
• Self-test failure
• Turn the meter on again in area free of CO.
• If error displays again, sensor failure. Return meter for repair.
T
ROUBLESHOOTING