Troubleshooting; Warranty; For More Information - 3M 740 Serie Instrucciones De Uso

TROUBLESHOOTING

Use the following table to help identify possible causes and corrective actions for problems you may experience. If you need further assistance, contact your M Service
Center or call M Technical Service in U.S.A., 1-800--60. In Canada, call Technical Service at 1-800-67-1.
Problem
Unit will not turn on
Display reads fault 67 or fault  after
changing sensor pack.
Zero Failure indicated by "UNR" on
display next to a specific sensor
Sensor test failure
Non-zero reading on start-up
Li-ion battery will not recharge
LCD message "TST" in main display area Sensor pack requires sensor test to be performed.
LCD message
"REPLACE SENSOR PACK"
IMPORTANT NOTICE

WARRANTY

M warrants its Portable Gas Detectors and Monitors 110, 50, 70 and 950 Series instruments, to be free from defects in material and workmanship in normal service
and under normal conditions for the following periods:
Electronics
110 Series Battery
70 and 950 Series Rechargeable Batteries
OX, EX, HS and CO sensors
70 Series Sensor Packs
All other sensors
This warranty is void if the M Portable Gas Detector or Monitor has been damaged by accident, misuse, neglect, improper service, or other causes not arising out of
defects in material or workmanship. This warranty does not include replaceable items, such as filter elements, alkaline and 50 series batteries, which are considered
part of a regular maintenance program. Any implied warranties arising out of the sale of M's Portable Gas Detectors or Monitors including but not limited to the implied
warranties of merchantability and fitness for a particular purpose, are limited in duration to the periods stated above. M shall not be liable for loss of use of any of its
products or incidental or consequential costs, expenses, or damages incurred by the purchaser or any other user.
REMEDY
Should the M Portable Gas Detector or Monitor fail in normal service under normal conditions through no fault of the purchaser or any other user during the warranty
period, return the detector or monitor to a M authorized warranty repair service center. For the location of M authorized repair service centers, call M in U.S.A., 1-800-
-60. In Canada, call Technical Service at 1-800-67-1. No charges will be made for repair or replacement. Each repaired unit is warranted for sixty (60) days or
the remaining portion of the original equipment's warranty, whichever is longer.
EXCLUSIONS TO WARRANTY: THE FOREGOING WARRANTY IS EXCLUSIVE AND IS IN LIEU OF ALL OTHER WARRANTIES EXPRESS, IMPLIED, OR STATUTORY, INCLUDING
WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR OTHER WARRANTY OF QUALITY.
LIMITATION OF LIABILITY: THE FOREGOING CONSTITUTES THE SOLE AND EXCLUSIVE REMEDY AND IS LIEU OF ANY AND ALL OTHER REMEDIES WHICH MAY BE
AVAILABLE. This warranty becomes void immediately should any repair of or alterations to the warranted equipment be made without authorization by M.

FOR MORE INFORMATION

In United States, contact:
Internet: www.M.com/OccSafety
Technical Assistance: 1-800--60
For other 3M products:
1-800-M-HELPS or 1-651-77-6501
Possible Solution
· Check that the battery pack connection pads are clean and in good condition or ensure that the  AAA batteries are oriented correctly.
· If equipped with a Li-ion battery pack, ensure that you are in a non-hazardous environment and plug the detector into the
battery charger. If equipped with alkaline batteries, ensure that these batteries have full charge or replace with new batteries.
· Ensure the zebra strip is in place.
· Clean zebra strip with pencil eraser
· Ensure that you are in a non-contaminated environment and repeat the sensor test process.
· The unit will allow only a certain range of zero values during the test process. Should a sensor pack be outside of the allowed
range then the sensor pack may need replacement.
· The detector may sense that the test gas being used is outside of the expected range or that the flow is not sufficient for test.
Confirm that the correct test gas is being used and that sufficient gas flow is available (0. to 0.5 liters per minute).
· Confirm that the gas hose is properly connected to both the test gas cylinder and the test hood, and that the test hood is
securely fastened to the unit.
· Ensure that the combustible gas in the test gas cylinder matches that defined for the detector. The default combustible gas is
methane (0.5% v/v, 10% LEL).
· It is possible that the combustible sensor has been contaminated by the presence of contaminants such as Hydrogen Sulfide
or Silicone compounds. This contamination may be temporary or permanent, depending on the particular contaminant and the
length of exposure.
· It is also possible that the sensor(s) have simply reached their end of life and the sensor pack needs to be replaced.
· Ensure that you are in a clean air environment.
· Perform a zeroing operation through the sensor test procedure (see Testing the Sensors section).
· Attempting to charge at too low a temperature (less than  °F, 0 °C) may cause this fault.
· Attempting to charge the battery when too warm will cause a safety shutdown of the charger. Normal maximum charging
temperature is 95 °F, 5 °C.
· Battery is already fully charged – check battery symbol on LCD.
· Ability of the battery to be recharged has been exceeded; replace with a new 70 series detector Li-ion battery pack. The
number of recharge-discharge cycles is expected to exceed 1000 or more.
Sensor pack requires replacement. See the PRODUCTS, ACCESSORIES AND PARTS section to select replacement pack. See the
MAINTENANCE section for replacement instructions.
 years from date of manufacture
 years from date of manufacture
 years from date of manufacture
 years from date of manufacture
 years from date of manufacture
1 year from date of manufacture
In Canada, contact :
Internet : www.M.com/CA/OccSafety
Technical Assistance : 1-800-67-1
For other 3M products :
1-800-6-577
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