System Bump Test - Emerson MRLDS-450 Installation And Operation Manual

a. MRLDS-400 App: Press the Start Span button.
b. Manual: Tap MAG#2 within 30 seconds or the instrument will time-out and return to normal
operation.
4. Complete zero adjustment:
a. MRLDS-400 App: App will countdown to completion. If calibration is successful, proceed to
Step 5. If calibration is unsuccessful, return to the Home screen and press the Acknowledge 
button to clear the zero calibration fault.
b. Manual: The LED will blink GREEN-ORANGE, GREEN-ORANGE-ORANGE, GREEN-
ORANGE-ORANGE-ORANGE, etc. until calibration is complete. To abort, hold MAG#2 for
>5-seconds, turn off gas flow and remove the calibration adapter. If calibration is successful
(LED blinks green-orange-red), proceed to Step 5. If calibration is unsuccessful (LED blinks 
orange @ 2 Hz), tap MAG#2 to discard the calibration attempt.
5. Turn off gas flow from calibration gas and remove the calibration adapter.
6. Allow sensor to recover/stabilize before the instrument returns to normal operation
(green LED).

5.2.5. System Bump Test

A bump test is a live test of the system to verify that the detector responds to gas and
all connected alarm devices, BMS, etc. are operating accordingly. It is
recommended that all involved persons are informed about the test and certain
alarms might have to be inhibited (For example, shutdown valves, notification of
authorities, etc.).
IMPORTANT: The manufacturer of this product requires that a bump test or calibration
be performed following installation to verify instrument functionality.
1. Connect adapter and gas cylinder according to the instructions in the General 
Calibration Procedure.
2. If desired, disable/silence external annunciators (For example, shutdown valves, 
notification of authorities, etc.):
a. MRLDS-400 App: On the Home tab select Calibrate then Bump. Toggle TAKE OFFLINE
to disable communications to external devices.
b. Manual: Inform building personnel of test so that external devices can be disabled/silenced.
3. Apply a sufficiently high concentration of the target gas to trigger alarms, but NOT
pure refrigerant or hydrocarbons (For example, do not use a butane lighter).
4. Once thresholds have been exceeded, relays should activate, digital outputs should
transmit the gas concentration and:
a. MRLDS-400 App: Gas concentration should be displayed, the instrument status should be
LOW ALARM or HIGH ALARM and alarms states should be ON.
b. Manual: LED status should display LOW ALARM or HIGH ALARM.
5. Turn off gas flow and remove the calibration adapter.
30 • MRLDS-450 Refrigerant Gas Detection I&O Manual 026-1316 Rev 0