21
OELD Operating Instructions
Note
Upon completing the start-up sequence, the OELD may momentarily report the status of the sensor as fault, inhibit or warning.
This can be as a result of the sensor connected taking more time to complete its initialization and it holding its output at a level
of less than 4 mA. This is normal.
6.1.2 Normal Operation
During normal operation, the LCD backlight provides an indication of the sensor status based on the sensor 4-20 mA output as follows:
Default Detection Ranges
OELD Backlight
Typical Status
Color
Flashing
Less than 1.5 mA
Yellow
Yes
Fault
1.5 to less than 2.5 mA
Yellow
No
Inhibit
2.5 to less than 3.5 mA
G
Y
G
Alternating Yellow
Warning
3.5 mA to less than Alarm Threshold*
Green
No
Normal
Greater than or equal to Alarm
Threshold*
Red
Yes
Hazardous Gas Concentration
3.5 mA to less than Alarm Threshold**
Blue
No
Normal, OELD connected to a mobile device
* Alarm threshold is configurable between 5 and 65 % FSD (4.8 mA to 14.4 mA)
Note
The current detection ranges are configurable by the user using the OELD app.
Note
The visual output of the OELD is derived from the 4-20 mA output of the sensor and/or status of the OELD unit. Use a suitable
mobile device and the OELD app to connect to the OELD using Bluetooth® to access further diagnostic information. When used
in conjunction with a Searchpoint Optima Plus or Searchline Excel, diagnostic and maintenance functions of the sensor can be
accessed also.
6 Operation
