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PolyGard® Digital Gas Controller
User Manual - DGC3
3.6.3
Page 16
Measuring Range
The measuring range can be defined arbitrarily between 10 and 10000. The measuring ranges in the table gas
type are only recommendations without obligation.
The measuring range must agree with the range of the attached gas transmitter.
3.6.4
MP Signal
Gas transmitters 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 their measuring principle. This signal
leads to a non-linear output signal of the gas transmitter.
The Gas Controller DGC3 is prepared for both types, for gas transmitters with linear signal as well as for analog
transmitters with semiconductor sensor and non-linear signal. The signal type is defined in this menu.
3.6.5
Symbol
Description
MP 01
Measuring Point
Linear
MP Signal
Setting
Status
Function
Selection of MP No.
Linear
Linear
= Transmitter with linear output signal
Non linear = Transmitter with non-linear output signal
Threshold / Hysteresis
For each measuring point four alarm thresholds are available for free definition. If the gas concentration exceeds
the adjusted alarm threshold, the associated alarm is set. If the gas concentration falls below the alarm threshold
inclusive hysteresis the alarm is reset again.
Unused alarm thresholds have to be defined with full scale value, in order to avoid false alarms.
For O2 measurement: Pay attention to the alarm activation at decreasing or increasing concentration!
Symbol Description
3.6.6
MP 01
Measuring Point
40 ppm
Threshold
Default
Status
40
80
100
120
15
Function
Threshold 1
Threshold 2
Threshold 3
Threshold 4
Hysteresis
Selection MP No.
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 X –Hysteresis)
= Alarm X OFF
Delay of Alarm ON or OFF
Definition of alarm ON and/or alarm OFF delay. The function applies to all alarms of an MP.
Default
Status
Symbol
Description
MP 01
Measuring Point
0s
Delay Time ON
0s
Delay Time OFF 0
0
Function
Selection of MP No.
Gas concentration > Threshold: Alarm is only activated at the end
of the fixed time (sec.). 0 sec. = No Delay
Gas concentration < Threshold: Alarm is only deactivated at the
end of the fixed time (sec.). 0 sec. = No Delay
The delayed activation of an existing gas alarm can cause damage to persons and objects.
The commissioning technician and/or the operator are solely responsible for the activation.
Polygard® is a registered trademark of MSR
Customer Services (858) 578-7887 & (888) GO INTEC
Fax (858) 578-4633 & (888) FX INTEC
www.inteccontrols.com
INTEC Controls, 12700 Stowe Dr., Suite 100, Poway, CA 92064
DGC3
Specification subject to change without notice.
Printed in USA 130917