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.
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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. |
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 Calibration.
NOTE: The Automated Test Stands cannot test the following sensors:
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GALAXY |
GALAXY GX2 |
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Chlorine Dioxide |
Chlorine Dioxide |
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% Vol Butane |
% Vol Butane |
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% Vol Propane |
% Vol Propane |
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% Vol Methane |
For these sensors, use this Bump Test procedure.
Equipment
See Accessories for ordering information for these components.
| • | Calibration Check Gas Cylinder(s) |
See Calibration Specifications for calibration gas target values and appropriate MSA calibration gas cylinders.
| • | Demand Flow Regulator(s) |
| • | Tubing appropriate for the gases to be tested |
| • | Kits containing tubing and regulators suitable for reactive and non-reactive gases are available from MSA. |
Performing a Bump Test
For ALTAIR 5X IR devices with combustible % Vol IR sensors, the following gas levels should not be exceeded when used for daily Bump Tests:
| • | IR Butane 25 % Vol - 8 % Vol Butane Cal Check gas |
| • | IR Propane 100 % Vol - 50 % Propane Cal Check gas |
| • | IR Methane 100 % Vol - 20 % Methane Cal Check gas. |
| • | IR Propane 100% LEL |
| 1. | While the device is turned ON in a clean, fresh air environment, verify that readings indicate no gas is present. |
| 2. | From the normal measure screen press the q button to display “BUMP TEST?”. |
| 3. | Verify the gas concentrations displayed match the Calibration Check Gas Cylinder. If they do not, adjust the values through the Calibration Setup menu. |
NOTE: Depending on the sensors installed, there could be one to five separate Bump Tests performed, each with a different cylinder, regulator, and tubing used.
| 4. | Attach the demand regulator (supplied in the calibration kit) to the cylinder providing the indicated gases. |
| 5. | Connect tubing (supplied in the calibration kit) to the regulator. |
| 6. | Attach the other end of tubing to the device pump inlet. |
| 7. | Press the ■ button to start the bump test: |
| ○ | the progress bar advances |
| ○ | the sensors respond to the gas. |
The message BUMP TEST PASS indicates a successful Bump Test of the sensors.
If any sensor fails the Bump Test the:
| • | Message BUMP TEST FAIL appears |
| • | Failed sensor is indicated. |
If there are more sensors to be Bump Tested, the next sensor displays and the process repeats from Step 4.
If there are no more sensors to be Bump Tested, the tubing can be removed from the device pump inlet.
In the ALTAIR 5X IR, Bump Testing of a combustible IR sensor causes the catalytic combustible sensor to enter the LockAlarm condition. While a device with a % Vol methane IR sensor automatically recovers from LockAlarm, propane or butane IR devices do not. For these devices, clear the LockAlarm state by turning the device OFF, then ON while in a fresh air environment. See Monitoring Combustible Gases for additional details.
After the Bump Test
After all installed sensors pass the Bump Test, the Ö symbol displays on the -MEASURE page. This Ö symbol appears on the:
| • | color display in the upper feature bar |
| • | monochrome display in the lower-right corner. |
If any sensor was not bump tested, or fails the Bump Test, the Ö symbol does not display.
The color display:
| • | temporarily shows the Ö symbol at each gas reading for successfully bump tested sensors |
| • | Ö symbol is then replaced by the present gas reading. |
| ○ | The monochrome display does not show Ö symbols for individual gas readings. |
| ○ | The Ö symbol shows for 24 hours after the Bump Test. |
| ○ | If a sensor fails the Bump Test, calibrate the device as described in Calibration. |