RKI Instruments RM-5000 Series Indicator/Alarm Unit - Manual (Page 49)

6 Operations and Functions 6-3. External output operation
- 49 - RM-5000
NOTE
NC-5001W offers two reading ranges (low and high ranges).
If the displayed combustible gas concentration rises above the full scale of the low range, the display is
automatically switched to the high range.
On the other hand, if the gas concentration drops below the full scale of the low range, the display is
automatically switched back to the low range.
The low range is indicated by lighting of the WL display, and the high range by lighting of the WH display,
informing the present reading range (low or high range).
Example
Target gas
: Isobutane
Reading range : 0-2000 ppm / 0 - 100%LEL
Status display : WL (low range) / WH (high range)
2.5 mA
4 mA
20 mA
22 mA
Full scale
Gas concentration
External output
0
Zero
suppression
Detection mode
Maintenance mode
16 mA
High range Low
range