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User Manual - PolyGard
Multi-Gas-Controller MGC2-K Honeywell
8.7.3 Alarm Thresholds / Hysteresis
Symbol Description
C
Evaluation
Threshold 1
Threshold 2
10 %
Threshold 3
LEL
Threshold 4
Hysteresis
For each measuring point four alarm thresholds are available for free definition. If the gas concentration is
higher than the set alarm threshold, the associated alarm is activated. If the gas concentration falls below the
alarm threshold minus the hysteresis the alarm is reset again. In the mode "Alarm at falling" the corresponding
alarm is set in case of falling below the set alarm threshold and reset again when exceeding the threshold plus
hysteresis.
The presentation of the alarm thresholds depends on the set measuring range: See chapter Gas Type and
Measuring Range.
The alarm thresholds are freely selectable in the range from 0 to 100 % of the measuring range.
The alarm threshold is only stored, if the value is ≥ than the lower alarm threshold
Unused alarm thresholds have to be defined with 0, in order to avoid undesired alarms.
Higher-level alarms automatically activate the lower-level alarms.
Lowest hysteresis: 3 % of the lowest alarm threshold
Highest hysteresis: 50 % of the lowest alarm threshold
®
PolyGard
is a registered trademark of MSR
Phone 0049(0)8531/9004-0
Fax: 0049(0)8531/9004-54
MSR-Electronic GmbH, Bgm.-Schoenbauer-Str. 13, D 94060 Pocking www:msr-electronic.de Made in Germany
®
2
Default
Function
C = Alarm evaluation with current value of MP
C
A = Alarm evaluation with average value of MP
XX
Gas concentration > Threshold 1 = Alarm 1
XX
Gas concentration > Threshold 2 = Alarm 2
XX
Gas concentration > Threshold 3 = Alarm 3
XX
Gas concentration > Threshold 4 = Alarm 4
XX
Gas concentration < (Threshold X –Hysteresis) = Alarm X OFF
= Alarm release at increasing concentrations
= Alarm release at falling concentrations
Page
Alarm Threshold 1
C 10.0 % LEL ↗
Alarm Threshold 2
C 20.0 % LEL ↗
Alarm Threshold 3
C
0.0 % LEL ↗
Alarm Threshold 4
C
0.0 % LEL ↗
Hysteresis
1.0 % LEL
Specification subject to change without notice
23
GAMGC2-K_E_0320
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