AccuTools eL-720 User guide

eL

-

720

Carbon Dioxide Gas

Leak Detector

User’s Guide

eL-720 User’s Guide

Congratulations on the purchase of the AccuTools™ eL-720
Carbon Dioxide Gas Leak Detector, the most technologically

advanced instrument of its kind. The eL-720’s minimal power
requirements, small size and high sensitivity combine to create a
tool which is easy to handle and ultra effective at locating even
the most difficult-to-find leaks.

Please read this entire manual prior to operation to ensure
trouble-free use of the eL-720.

TECHNICAL DATA

Dimensions 8” x 2.5” x 2.25” (20.3 cm x 6.3 cm x 5.7 cm)

Weight 15 oz. (425 grams) with Batteries
Batteries 4 x 1.5V 'AA' Alkaline Batteries (6 VDC)
Battery Life 20 hours
Sensitivity (High) < 400 ppm at 350 ppm ambient
Sensitivity (Low) < 4,000 ppm at 350 ppm ambient
Sensor lifetime > 2 years
Operating temperature 32 – 122°F (0 – 50°C)
Warm up time 10 sec.
Response time < 1 second
Reset time < 1 second
Probe length 12” (30 cm)

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eL-720 User’s Guide

WARNING: The eL-720 contains an optical sensor that must remain
free of moisture and debris. Failure to operate the unit without a
filter may cause the sensor to become contaminated. This will result
in a sensor malfunction as indicated by the failed sensor alarm.

INSTRUCTIONS

1. Press the button to turn the unit on. Unit will beep 3 times and all
LEDs will light.

2. The unit will warm up and self-calibrate for 10 seconds, after which a
constant beeping will be heard.

3. Test the unit by exhaling gently into the probe tip. Human breath
contains enough CO2 to cause a full-scale alarm in High Sensitivity.

4. Unit turns on in the high sensitivity level (400 ppm). For zeroing into
large leaks, change to the low sensitivity level: Press the button
twice (double-click like a computer mouse). The LEDs will scan from
right to left and a sweeping sound effect of high to low pitch will be
heard. The sensitivity is now set for 4,000 ppm.

5. Double click again to change back to high sensitivity. The LEDs will
scan from left to right and a sweeping sound effect of low to high
pitch will be heard.

6. To reset the unit to the ambient level of carbon dioxide, press and
release the button. The LEDs will flash briefly to indicate the reset.
All levels of carbon dioxide less than the reset level will be ignored.

7. Move the probe towards a suspected CO2 leak at a rate of less than
2 inches (50 mm) per second, no more than ¼ inch (5 mm) away
from the suspected source.

8. If a leak exists, the sound will increase in rate and pitch and the
LEDs will indicate the relative leak rate.

9. To turn the eL-720 off, press and hold the button for 1 second.

10. To conserve battery power, the eL-720 will automatically turn itself

off after 10 minutes of inactivity.

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eL-720 User’s Guide

PROBE FILTER

The probe filter prevents dust and moisture from contaminating the
optical characteristics of the sensor. It should be replaced periodically.

Occasionally, the filter may become obstructed with dirt, dust, or
moisture. To determine if air is flowing properly into the eL-720 sensor,
gently exhale near the probe tip. The human breath contains enough
CO2 to cause a full alarm in high sensitivity mode. If the unit does not
alarm, replace the filter.

If the filter has become moist due to exposure to water or
condensation follow this procedure to prevent moisture from
contaminating the sensor:

1. Using a paper towel or shop rag, dry any moisture at the probe tip
prior to unscrewing the probe tip cap.

2. Unscrew the probe tip cap to expose the filter.

3. With a paper towel or shop rag, soak up any excess moisture that
may have collected on the filter and filter holder prior to removing the
filter. Also thoroughly dry both inside and outside of the probe cap.

4. Remove and discard the old filter, and replace with a new one.

5. Reassemble the probe tip cap. The unit is now ready for operation.

Failure to dry the filter parts as described above may result in
further contamination of the new filter, and the possibility of
residual moisture being drawn into the optical sensor, causing a
failed sensor alarm. If moisture is suspected of being drawn into the

sensor, clean the probe and sensor as described on page 4.

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eL-720 User’s Guide

SENSOR

An eL-720 sensor is designed for a long, trouble-free life. The
sensor is tested and calibrated automatically each time the unit is
powered on. A failed or failing sensor will be indicated 3

seconds after power-on by a two-tone alarm and all LEDs
flashing.

CLEANING THE SENSOR

If moisture is suspected of contaminating the sensor, the probe
and sensor may be cleaned using this procedure.

1. IMPORTANT: Remove the sensor from the instrument as
directed on page 5.

2. Remove the probe tip cap and filter from the probe tip.

3. Blow compressed air into the probe tip to remove any residual
moisture from the probe.

4. Blow compressed air* into the inlet and outlet ports of the
sensor.

5. Place a few drops of distilled water or isopropyl alcohol into
both the inlet and outlet ports of the sensor.

6. Blow compressed air* into the inlet and outlet ports of the
sensor to remove any remaining liquid and thoroughly dry the
exterior of the sensor.

7. Install the sensor, and insert a new filter into probe tip. The
unit should now operate properly.

* Note: Do not exceed 50 psi pressure. Doing so may result
in the loss of the small o-rings in the inlet and outlet ports of
the sensor.

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eL-720 User’s Guide

SENSOR REPLACEMENT

In the event of a failed sensor (as indicated by the Failed Sensor
Alarm), cleaning or replacement of the sensor is necessary. First,
clean the sensor as directed on page 4. If an alarm is still heard,
the sensor must be replaced. To replace the sensor:

1. Turn the power off.

2. Remove the sensor compartment cover by loosening the
sensor compartment cover screw.

3. Remove the 2 screws holding the sensor in place with a 1.5
mm hex wrench.

4. Grasp the old sensor with your fingers near the screw holes
and firmly lift out of the sensor compartment.

5. Firmly press the new sensor into the compartment, noting
alignment of the sensor connector tab and gas ports of the
sensor with the mating features in the instrument.

6. Firmly tighten sensor in place with 2 screws and 1.5 mm hex
wrench.

7. Replace and fasten sensor compartment cover.

Replacement Sensor Kit
Part Number ELS-7CO2

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eL-720 User’s Guide

BATTERIES

Ÿ The left-most (blinking) LED indicates the battery life, and

dims when the batteries approach end of life. Less than one
hour of battery life remains when the LED is completely dark.

• When the batteries no longer contain enough energy to power
the instrument reliably, a five second tone will be heard, after
which the eL-720 will power itself off.

Ÿ If the unit is left on unattended, it will automatically turn off

after about 10 minutes to conserve batteries.

BATTERY INSTALLATION AND REPLACEMENT

1. Turn the power off.

2. Remove the battery cover from the back of the instrument by
loosening the battery cover screw and lifting the battery cover
off.

3. Insert 4 size ‘AA’ alkaline batteries, observing proper battery
polarity.

4. Replace battery cover and tighten battery cover screw.

MAINTENANCE

The eL-720 should provide years of service with little
maintenance aside from changing batteries, filters, and sensors.
The case may be cleaned with a shop towel moistened with water
and a mild detergent. Do not use solvent of any kind.

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NOTES

eL-720 User’s Guide

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eL-720 User’s Guide

Warranty and Repair

1 Year Limited Warranty

Core Enterprises, Inc. warrants that this AccuTools™ product conforms to Core Enterprises, Inc. published
specifications and will be free from defects in material and workmanship. The duration is for a period of one
year from the date of purchase. Core Enterprises, Inc., at its option, will repair or replace this product or any
component of the product found to be defective during the warranty period. Replacement will be made with a
new or remanufactured product or component. This is your exclusive warranty.

This warranty is valid for the original retail purchaser from the date of initial retail purchase and is not
transferable. Keep the original sales receipt. Proof of purchase is required to obtain warranty performance.
Core Enterprises, Inc. dealers, service centers, or retail stores selling Core Enterprises, Inc. products do not
have the right to alter, modify or any way change the terms and conditions of this warranty.

This warranty does not cover batteries or any other normal wear of parts or damage resulting from any of
the following: negligent use or misuse of the product, damage caused by use of the product for purposes
other than those for which was designed, use contrary to the operating instructions, disassembly, repair or
alteration by anyone other than Core Enterprises, Inc. or an authorized Core Enterprises, Inc. service center.
Further, the warranty does not cover: Acts of God, such as fire, flood, lightning, hurricanes and tornadoes.

THE FOREGOING WARRANTIES ARE IN LIEU OF ALL OTHER WARRANTIES, CONDITIONS OR
REPRESENTATIONS, EXPRESS, IMPLIED, STATUTORY OR OTHERWISE, INCLUDING BUT NOT
LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITTNESS FOR A PARTICULAR
PURPOSE

Core Enterprises, Inc. shall not be liable for any incidental or consequential damages caused by the
breach of any express, implied or statutory warranty or condition.

Except to the extent prohibited by applicable law, any implied warranty or condition of merchantability or
fitness for a particular purpose is limited in duration to the duration of the above warranty.

Core Enterprises, Inc. shall not be liable for any damages of any kind resulting from the purchase, use or
misuse of, or inability to use the product including incidental, special, consequential or similar damages or loss
of profits, or for any breach of contract, fundamental or otherwise, or for any claim brought against purchaser
by any other party.

Some states or jurisdictions do not allow the exclusion or limitation of incidental or consequential damages
or limitations on how long an implied warranty lasts, so the above limitations or exclusion may not apply to
you.

This warranty gives you specific legal rights, and you may also have other rights that vary from state to
state or jurisdiction to jurisdiction.

How to Obtain Warranty and Repair Service

To obtain warranty or repair service, please call [phone] to obtain a RMA number. For warranty
service, a legible copy of the original receipt must be sent along with the RMA Form. Any package received
without this RMA number will be refused. The returned product must be properly packaged and insured
against shipping damage. Any shipping damage resulting from improper packaging shall be the responsibility
of the Purchaser. The repaired or replaced product will be returned to Purchaser, freight prepaid via UPS
ground only. Repaired or replaced units carry an additional 90 days warranty.

© 2007 Core Enterprises, Inc. All rights reserved. AccuTools™ is a trademark of Core Enterprises, Inc.

8

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www.accutools.com

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