Status Indication; Switch Functions - Emerson DIXELL MRLDS-450 Installing And Operating Instructions

4.1.4 Status Indication

The MRLDS-400 gas detectors provide external indication of their current operational state via
audible and visual feedback. (MRLDS-450 gas detectors also provide relays outputs.) Visual
indication of the instrument status is provided by a single tri-color LED (Green / Red / Orange) as
indicated below:
State
Warm-up
Normal
Low Alarm
High Alarm
Offline
Fault
Negative Gas Fault
Zero Cal. Fault
Span Cal. Fault

4.1.5 Switch Functions

User interaction with the MRLDS-400 gas detector is accomplished through the use of two
magnetic switches located on the bottom of each unit. To actuate a magnetic switch (referred to
as MAG#1 or MAG#2), apply the supplied magnetic wand to the relevant switch location as
indicated below:
1592018550 MRLDS-450 GB r.1.2 29.05.2020
LED Buzzer
MRLDS-450
Relay 1 Relay 2
(LOW) (HIGH)
OFF OFF
OFF OFF
ON OFF
ON ON
OFF OFF
OFF OFF
OFF OFF
OFF OFF
OFF OFF
Relay 3
(Fault)
OFF
OFF
OFF
OFF
OFF
ON
ON
OFF
OFF
21/39