Dwyer 450A-1 - Manual (Page 2)

CALIBRATION
A periodic check of the system calibration is recommended.
To 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:
Place meter in an area free of CO and enter calibration mode. The unit will calibrate
automatically. The display will blink until calibration is complete. This takes about
10 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
value is reached. Place meter in sealed box filled with the selected calibration gas
standard for 15 minutes. Check if the reading meets calibration standard. If it does
not, repeat the procedure.
MAINTENANCE
Model 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
brief 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: 219/879-8000 www.dwyer-inst.com
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A. Fax: 219/872-9057 e-mail: [email protected]
©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
Power on but no display
Display disappears
Calibration failure
E 2
E 3
E 4
E 31
E 33
E 35
Solution
• 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
display disappears. If so, replace with new batteries.
•Determine if the low battery indicator shows before calibration. If so,
replace 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.
TROUBLESHOOTING