Bump Testing - Emerson MRLDS-250 Installation And Operation Manual

correctly.
There are two types of bump tests:
• Quantified: A known concentration of gas is used.
• Non-quantified: A gas of unknown concentration is
used.
Gas Detector Response Adjustment:
Adjusting gas detector response exposes the gas
detector to a calibration gas as well (like a quantified
bump test), but additionally sets the actual gas
detector response level (via parameter P.-17) to
ensure that the gas detector activates at the specified
gas concentration.
Refer to Section 6.3., Bump Testing and Section
6.4., Adjustment Using Calibration Gas for
additional information on bump testing and gas
detector response adjustment.
CAUTION: Before you carry out the test or
adjustment:
• Advise occupants, plant operators, and supervisors.
• Check if the gas detector is connected to external
systems such as sprinkler systems, plant shut down,
external sirens and beacons, ventilation, etc., and
disconnect as instructed by the customer.
• For bump test or calibration, the MRLDS-250
should be powered up and fully stabilized per Section
4, Operation and Stabilization.

6.3. Bump Testing

CAUTION: Notify others that testing is
underway. During bump testing, the alarm
outputs are active and will trigger the intended
response. It is the operator's responsibility to
ensure that such actions are acceptable and can be
performed safely.
CAUTION: Do not pressurize the gas detector.
Limit the flow to one liter per minute
maximum.
Bump Testing
After installation and parameter setup (see Section
5, Configure the Gas Detector), the units should be
bump tested. Expose the gas detector to test gas. The
gas selected should be a high enough concentration to
put the system into alarm and illuminate the LED
display.
With a bump test you can see the functions of the
gas detector:
• The LED display will illuminate and show the
detected PPM concentration once the alarm setpoint
is reached.
• The relay and audible alarm will function as
configured.
• The output (0-10V, for example) will show the gas
level.
Ideally bump tests are conducted on-site in a clean
air atmosphere.
NOTE: To test the audible alarm and/or relay
function, check if the delay is set to zero and
exposed to gas. You can mute the audible
alarm by pressing the Information button. The
alarm will reactivate after the timeout set in parameter
P.-12.
Bump Testing Using Calibration Gas
Step
1 Remove the Splash Guard accessory if one is used.
2 Connect the regulator to the test gas port using 3 mm
or 1/8" inside diameter tubing (see below).
3
Expose the gas detector to gas from the cylinder.
Monitor the LED display reading. Refer to the
Section 1.5., Specifications for acceptance criteria.
Table 6-1 Adjustment Using Calibration Gas Cylinders
Functional Tests and Adjustments • 17
Cylinders