MSA ALTAIR 4XR, Operating Manual

Page: 34 / 63

ALTAIR
®
4XR
34
Operation
US
3.8 Bump Test
WARNING!
Perform a Bump Test before each day’s use to verify proper device operation. Failure to perform this
test can result in serious personal injury or death.
This test quickly confirms that the gas sensors are functioning. Perform a full calibration periodically to
ensure accuracy and immediately if the device fails the Bump Test. The Bump Test can be performed
using the procedure below or automatically using the GALAXY GX2 Test Stand.
CSA requires (per 22.2 NO. 152) that combustible sensor sensitivity be tested before each day's use
on a known concentration of methane equivalent to 25 to 50 % of full scale concentration. ACCURACY
MUST BE WITHIN 0 to +20 % OF ACTUAL. Correct accuracy by performing the calibration procedure
described in chapter 3.10 "Calibration".
Equipment
See accessory section for ordering information for these components.
• Calibration Check Gas Cylinder
• 0.25 liters/min. Flow Regulator
• 1/8” ID Superthane Ester Tubing
• Calibration Cap
Performing a Bump Test
Bump test frequency is often stipulated by national or corporate regulations; however,
bump testing before each day’s use is generally the accepted best safety practice and
is therefore MSA’s recommendation.
(1) Connect the regulator to the Calibration Check Gas
Cylinder.
(2) From the Normal Operation screen press the  button
to display “
BUMP TEST?
”.
(3) Verify the gas concentrations displayed match the Cali-
bration Check Gas Cylinder. If they do not, adjust the
values through the Calibration Setup menu as
described in chapter 3.4 "Device Setup".
(4) Attach the calibration cap (see chapter 3.10 "Attach the
Calibration Cap")
(5) Press the
q
button to start the Bump Test. If calibration
lockout option is selected, enter password. The hour-
glass will flash and the sensors will respond to the gas.
(6) Open the pressure reducer valve on test gas cylinder.
(7) Close the valve after bump testing.
After the Bump Test completes, the device momentarily
displays “
BUMP PASS
” or “
BUMP ERROR
” along with the label
of any sensor that failed before returning to Normal Operation
mode. If the device fails the Bump Test, perform a calibration
as described in chapter 3.10 "Attach the Calibration Cap".