Emerson MRLDS-250 Installation And Operation Manual page 24

NOTE: The analog output signal
range is from 100 PPM to the
default value of 3500 PPM, which
is scaled across the actual output
range selected by the analog output
type parameter P.-03. The upper PPM limit is
programmable using analog output scaling
parameter P.-16. This parameter sets the full
scale PPM value creating a PPM range across
which the analog output is scaled. See Figure
5-2 for more details.
Figure 5-2 - Analog Output Scaling Options
18 • MRLDS-250 Infrared Gas Detector I&O Manual
Parameter
Gas Test Mode
Places the gas detector in gas
test mode.
00 Disabled (default)
01 Enabled
When enabled, the display
continuously cycles through the
following:
• CAL is displayed briefly.
• Next, the gas group number or
gas type (based on product code)
is displayed.
• Then four dashes (----) are
displayed.
After gas is applied and the 75
PPM squelch level is exceeded,
the live concentration replaces
the four dashes.
See Section 6.4., Adjustment
Using Calibration Gas if using
Gas Test Mode to initiate the
calibration procedure.
NOTE: To prevent false alarms,
all outputs are suspended while
Test Mode is active. The only
live indication is the 4-digit
display.
Once the gas test mode is
enabled to perform a gas test or
calibration, the unit will
automatically go offline for a
10- minute period after the
parameter list is exited. (This
allows time for the test gas to
clear before the unit becomes
active)
If no activity occurs for ten
minutes, the unit exits the Gas
Test Mode
Table 5-2 - Parameter Numbers, Names, and
Descriptions
Description
026-1315 Rev 4