Overview of Normal Operation
Operation • 15
4.1.4. Status Indication
The MRLDS-450 gas detections provide external indication of its current
operational state via audible and visual feedback. Visual indication of the instrument
status is provided by a single tri-color LED (Green/Red/Orange). MRLDS-450 gas
detection instruments also provide relays outputs. Instrument states and
corresponding outputs are shown in
.
Table 4-4
- Status Indicators
State
LED
Buzzer
Relay 1
(LOW)
Relay 2
(HIGH)
Relay 3
(Fault)
Warm-up
OFF
OFF
OFF
Normal
OFF
OFF
OFF
Low Alarm
ON
OFF
OFF
High Alarm
ON
ON
OFF
Offline
OFF
OFF
OFF
Fault
OFF
OFF
ON
Negative Gas Fault
OFF
OFF
ON
Zero Cal. Fault
OFF
OFF
OFF
Span Cal. Fault
OFF
OFF
OFF
4.1.5. Switch Functions
User interaction with the MRLDS-450 gas detector is accomplished through the use
of two magnetic switches located on the bottom of each unit. To actuate a magnetic
switch, apply the supplied magnetic wand
to the relevant switch location as shown
in
.
