UEi CO71A, C071 Instruction Manual

1-800-547-5740 • Fax: [phone]

www.ueitest.com • email: [e-mail]

CO71A

INSTRUCTION MANUAL

Turn OFF countdown

If turned off accidentally, press the button again to cancel.

Note: The meter will not automatically shut off. This is to avoid
interruption during a test. To conserve battery life, be sure to turn
off your CO71A when not in use.

MAX button

Maximum value display.

Press MAX to display the highest reading detected while the meter is
switched ON.

HOLD button

Holds value when button is pressed.

Freezes the display with the CO reading at the time the HOLD button is
pressed. Press again to display current value.

Visual Indicator

The LED on the top of the CO71A lights and changes color when CO
levels increase or decrease.

OFF: 0-1 PPM
GREEN: 2-9 PPM
AMBER: 10-34 PPM
RED: 35 PPM or higher

These values are based on environmental and health standards as
listed in table 1.

Checking For CO

Note: Ensure that the sensor grille at the rear of the instrument is free
from obstruction. A quick instrument check can be performed by smoke
from a blown out match. Let smoke enter the sensor grille. This will
cause the indicated CO level to increase.

Introduction

The CO 71A is used to monitor Carbon Monoxide (CO) levels in
commercial and residential living spaces, warehouse operations,
combustion engine repair facilities, public facilities and any other indoor
areas where people may work or live. The full-featured, compact design
of the CO 71A allows for easy use in most any working environment.

Features include

• One button On with Auto Zero

• Measures from 0 to 999 PPM CO

• Captures maximum value

• Preset Alarms

• Visual three color LED

• Audible tone

• Data Hold

• Back lit display

• Low Battery Indication

• CO sensor self test function

• 5 year expected sensor life (3 year warranty)

WARNING!

This instrument should only be used by trained and competent
persons, after due considerations of any risks involved.

Carbon Monoxide is life threatening even at relatively low
concentrations. Be sure you understand the risks before investigating
potential leaks.

Operating Instructions

ON/OFF ( button)

The CO 71A is operated by a single button for ON and OFF. It is designed
for use in ambient air, ranging in temperature from 32 to 104°F (0 to
40°C). When the unit is switched ON (Only switch ON outdoors or where
no CO is present) it automatically zeros in 50 seconds. During countdow n
the display shows time remaining as two digits.

Turn ON countdown

When the countdown reaches 00 the meter will set its sensor to zero
and display CO concentration using three digits.

Normal display
CO PPM

Hold down the ON/OFF key to switch the meter OFF, the display will
s h ow a single digit and count down for 9 seconds.

000

9

039

MAX

025

HOLD

39

CO71-MAN P. 1

Troubleshooting

If the display fails to stabilize at around zero within a few minutes this
may indicate an expired sensor or a sensor that has been exposed to
excessive levels of CO. If the symptom persists seek advice from an
approved service center.

Always check for correct operation before each use. Use a known source
of CO (e.g. a smoking match stick or a recently extinguished flame) taking
care to act in a safe manner and not to expose the CO 71 sensor to
extreme temperatures or CO concentration. If the unit does not change as
expected, return the unit to UEi or an approved service center.

If during use, you detect CO leaks, be sure you know the appropriate
actions to take to protect yourself and others. Before switching off the
instrument always expose it to fresh air until the reading falls below 5
PPM. Note that the readings fall much more slowly than they rise so
you may need to wait three minutes or longer.

Sensor Self Check

The CO 71A includes a sensor self test function. It is recommended that
this test be performed once per month to verify proper operation. Higher
f r e q u e n c y activation of the self test may shorten the sensor lifespan.

This test releases a safe amount of Hydrogen gas to simulate the
presence of Carbon Monoxide (CO). The sensor is reactive to
hydrogen in the same manner as CO. If the sensor is functioning this
test will provide a display above zero ppm. Hydrogen generated by the
self test will vary during each test so the CO71A may display different
results each time a self test occurs. It may also take a long time for the
sensor to stop measuring Hydrogen before returning itself to a near
Zero reading.

We recommend the test is used sparingly - once a month at most - and
perform it at the beginning or end of the day allowing sufficient time for
the sensor to return to zero.

CO71a Self Test

• Turn on meter and allow to zero in fresh air

• Press and release recessed button on the front housing of
the meter

• A red light will illuminate to indicate the test is in progress

• Displayed value should indicate measured CO

• Allow the display to return to zero

• This may take up to five minutes to complete

• Continue using per the instructions

• Return to UEi for service if the display does not show a reading
during the self test.

Audible alarm

An audible alarm will sound if 35 PPM CO (or greater) is detected.
The alarm frequency will increase with higher concentrations. Check
the LCD display for actual level. While the alarm is sounding the unit
can not be turned off.

Back-Light

To activate the back-light press the ON/OFF key quickly once.
Do not hold down the key or the unit will switch off.

To turn off the back-light press the ON/OFF key quickly again.

Note: Using the back-light decreases battery life.

LOW BATTERY INDICATION

Low battery indicator

If the battery voltage falls below a pre-set level the symbol “ BAT ”
appears in the display. Do not use the instrument when this symbol is
present. Replace the battery immediately.

Concentration
of CO in Air
9 ppm

35 ppm

200 ppm

400 ppm

800 ppm

1,600 ppm

3,200 ppm

6,400 ppm

12,800 ppm

Inhalation Times and Toxic Symptoms*

The maximum allowable concentration for short
term exposure in a living area according to
ASHRAE.
The maximum allowable concentration for
continuous exposure in any eight hour period
industry according to MIOSHA.
Maximum concentration allowable in any 15
minute period according to OSHA. Slight
headaches, fatigue, dizziness, nausea after 2
to 3 hours.
Frontal headaches within 1 to 2 hours, life
threatening after 3 hours. Maximum allowable
limit in flue gas according to EPA and AGA.
Dizziness, nausea and convulsions within 45
minutes. Unconsciousness within 2 hours.
Death within 2 to 3 hours.
Headache, dizziness and nausea within 20
minutes. Death within 1 hour.
Headache, dizziness and nausea within 5 to 10
minutes. Death within 30 minutes.
Headache, dizziness and nausea within 1 to 3
minutes. Death within 10 to 15 minutes.
Death within 1 to 3 minutes.

*The effects can vary depending on size, age, sex and health. UEi is not liable for the accuracy
of this information.

(Table 1)

039

BAT

CO71-MAN P. 2

Specifications

No user serviceable parts. Re-calibrate every 12 months.
Check for correct operation as described in this manual before

every use.

CO71-MAN P. 3

Range: 0-999 ppm

Resolution: 1 ppm

Accuracy: ±(3% of reading + 1 ppm)

Audible Alarm: Preset at 35 ppm

Visual Indication: LCD and LED

Battery: 9V alkaline (NEDA 16 0 4 )

Ambient 32 - 104˚F (0 - 40˚C)
Temperature:

Warranty: 3 year

Limited Warranty

The CO 71A is warranted to be free from defects in materials and workmanship for a period
of three years from the date of purchase. If within the warra n ty period your instrument
should become inoperative from such defects, the unit will be repaired or replaced at UE i ’ s
option. This warra n ty covers normal use and does not cover damage which occurs in
shipment or failure which results from alteration, tampering, accident, misuse, abuse,
neglect or improper maintenance. Batteries and consequential damage resulting from failed
batteries are not covered by warra n ty.

Any implied warranties, including but not limited to implied warranties of merchantability
and fitness for a particular purpose, are limited to the express warranty. UEi shall not be
liable for loss of use of the instrument or other incidental or consequential damages,
expenses, or economic loss, or for any claim or claims for such damage, expenses or
economic loss. A purchase receipt or other proof of original purchase date will be required
before warra n ty repairs will be rendered. Instruments out of warra n ty will be repaired
(when repairable) for a service charge. Return the unit postage paid and insured to:

1-800-547-5740 • FAX: [phone]

www.ueitest.com • Email: [e-mail]

This warranty gives you specific legal rights. You may also have other rights which vary from
state to state.

CO71A

Carbon Monoxide Detector

Copyright © 2007 UEi CO71-MAN 1/07

PLEASE

RECYCLE