12700 Stowe Drive, Suite 100, Poway, CA 92064 | Ph: (858) 578.7887 & (888) GO.IN
TEC
| relevantsolutions.com/inteccontrols
Specifications subject to change without notice. | USA 160811 | Page 18 of 34
MGC2 – UserManual
PolyGard
®
is a registered trademark of MSR-Electronic GmbH
Direction of the alarm release
In the gas measuring technique, most of the gases are monitored for their increasing concentration. For example
oxygen, however, is monitored for its falling concentration. In this menu there is the definition how many of the 5 alarm
thresholds monitor a falling concentration.
4.6.4 Measuring Range Definition
The measuring range can be adjusted to the working range of the connected gas transmitter within 10 to 10000.
4.6.5 SP Signal Definition
Gas transmitter using electro-chemical or catalytic beat gas sensors normally produce a linear signal, proportional to
the gas concentration.
Semiconductor gas sensors produce a non-linear (exponential) signal due to the measuring function. This signal leads
again to a non-linear 4 to 20 mA signal of the gas transmitter.
The Gas Controller GC-05 is prepared for both types of gas transmitters. The classification of signals is defined in this
menu.
Symbol
Description
Setting Status
Function
SP01
Sensor Point
Selection SP No. / analog transmitter
Linear
SP Signal
Linear
Linear
= Transmitter with linear output signal
Non-linear = Transmitter with non-linear output signal
(semiconductor)
4.6.6 Threshold/Hysteresis
For each sensor point five 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 inclusive
hysteresis the alarm is again reset. In the mode “Alarm at falling” the corresponding alarm is set in case of falling
below the set alarm threshold.
Unused alarm thresholds have to be defined at measuring range end point, in order to avoid false alarms.
Symbol
Description
Default
Status
Function
SP01
Sensor Point
Selection SP No. / analog transmitter
80 ppm
Threshold
80
100
120
120
300
15
Threshold 1
Threshold 2
Threshold 3
Threshold 4
Threshold 5
Hysteresis
Gas concentration > Threshold 1 = Alarm 1
Gas concentration > Threshold 2 = Alarm 2
Gas concentration > Threshold 3 = Alarm 3
Gas concentration > Threshold 4 = Alarm 4
Gas concentration > Threshold 5 = Alarm 5
Gas concentration < (Threshold X - Hysteresis)
= Alarm X OFF
4.6.7 Delay for Alarm ON and/or OFF
Definition of delay time for alarm ON and/or alarm OFF. The function applies to all alarms of an SP.
Symbol
Description
Default
Status
Function
SP01
Sensor Point
Selection SP No. / analog transmitter
0 s
Delay Time
ON
0
Gas concentration > Threshold: Alarm is only activated at the
end of the fixed time (sec.). 0 sec. = No Delay
0 s
Delay Time
OFF
0
Gas concentration < Threshold: Alarm is only deactivated at the
end of the fixed time (sec.). 0 sec. = No Delay
