RKI Instruments Digester Gas Monitor User Manual
Page 62
56 • Viewing and Changing Channel Parameters
Digester Gas Monitor Operator’s Manual
Relay-1 Assignment
(ALARM-1)
The alarm condition that activates relay 1. It can be set for
activation by the following alarm conditions:
•
ALARM-1
•
ALARM-2
•
ALARM-3
•
ALARMS 1 or 2
•
ALARMS 1 or 3
•
ALARMS 2 or 3
•
ALARMS 1, 2, or 3
•
Use As Channel FAIL (If you choose this setting, the
relay is normally energized)
Relay-2 Assignment
(ALARM-2)
The alarm condition that activates relay 2. It can be set for
activation by the following alarm conditions:
•
ALARM-1
•
ALARM-2
•
ALARM-3
•
ALARMS 1 or 2
•
ALARMS 1 or 3
•
ALARMS 2 or 3
•
ALARMS 1, 2, or 3
•
Use As Channel FAIL (If you choose this setting, the
relay is normally energized)
NOISE FILTER
(5 seconds)
The noise filter feature helps “smooth out” jumpy or noisy
signals from the detector. The filter setting indicates the
number of seconds over which the displayed reading is
being averaged. You can set the noise filter from 1 second
to 10 seconds.
A setting of 10 seconds produces the greatest amount of
smoothing, but causes the displayed gas reading to
respond more slowly to changes in gas concentrations.
A setting of 1 second gives the fastest gas reading
response to a change in gas concentration, but gives the
least amount of smoothing.
Deadband
(0.5% oxygen for oxygen
channels; 2.0% of Full Scale
in terms of the channel’s
units for all other channel
types.)
The deadband setting defines the first gas concentration
that will be displayed when the gas reading increases or
decreases from the normal fresh air concentration (20.9 for
oxygen and 0 for all other channel types). This feature
helps prevent “jumpy” readings near the normal fresh air
reading.
For example, if the zero suppression setting is 2 %LEL for
a combustible channel whose range is 0 - 100% LEL, the
Digester Gas Monitor will display a reading of 0 %LEL for
gas readings from -1 %LEL to 1 %LEL.
Table 8: Configuration Menu Parameters (Continued)
Channel Parameter
(Factory-Set Value)
Description