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IN
TEC
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Specification subject to change without notice.
Printed in USA 140225
Polygard® is a registered trademark of MSR
SPC3-11XX US
PolyGard
®
Single-Point Controller
User Manual - SPC3-11XX
Page 16
3.6.3
Measuring Range
The measuring range can be defined arbitrarily between 0 and 10,000. The measuring ranges in the table gas type are
only recommendations without obligation.
The measuring range for SP01 (inside toxic sensor) is factory set, the measuring range for SP02 must agree with the
signal (4 to 20 mA / (0)2 to 10 V) of the attached gas transmitter.
(4 mA / (0)2 V = Display 0 (ppm); 20 mA / 10 V = Display of the ultimate value of the measuring range)
3.6.4
SP Signal
Gas transmitters using electro-chemical or catalytic beat gas sensors normally produce a linear 4 to 20 mA / (0)2 to 10
V signal, proportional to the gas concentration.
Semiconductor gas sensors produce a non-linear (exponential) signal. This signal leads to a non linear 4 to 20 mA /
(0)2 to 10 V signal of the gas transmitter.
The Single Point Gas Controller SPC3 is prepared for both types of gas transmitters. The classification of signals is
defined in this menu.
Symbol Description
Setting
Status Function
SP 01
Measuring Point
Selection of SP No.
Linear
SP Signal
Linear
Linear = Transmitter with linear output signal
Non linear = Transmitter with non-linear output signal (only
AT series from MSR-E)
3.6.5
Stage/Set Point / Hysteresis
For each sensor point four alarm Stage/Set Points are available for free definition. If the gas concentration is higher
than the adjusted alarm Stage/Set Point, the associated alarm is set. If the gas concentration falls below the alarm
Stage/Set Point inclusive hysteresis the alarm is again reset.
Unused alarm Stage/Set Points have to be defined at measuring range end point, in order to avoid false alarms.
At O
2
measurement an alarm is released by a decreasing measuring signal!
Symbol Description
Default
Status
Function
SP 01
Measuring Point
Selection SP No.
50 ppm Stage/Set Point
50
100
100
250
15
Stage/Set Point
1
Stage/Set Point
2
Stage/Set Point
3
Gas concentration > Stage/Set Point 1 = Alarm 1
Gas concentration > Stage/Set Point 2 = Alarm 2
Gas concentration > Stage/Set Point 3 = Alarm 3
Gas concentration > Stage/Set Point 4 = Alarm 4
Gas concentration < (Stage/Set Point X –
Hysteresis)
3.6.6
Delay of Alarm ON or OFF
Definition of alarm ON and/or alarm OFF delay. The function applies to all alarms of an SP.
Symbol Description
Default
Status Function
SP 01
Sensor Point
Selection of SP No.
0 s
Delay Time ON 0
Gas concentration > Stage/Set Point: Alarm is only activated at
the end of the fixed time (sec.). 0 sec. = No Delay
0 s
Delay Time OFF 0
Gas concentration < Stage/Set Point: Alarm is only deactivated at
the end of the fixed time (sec.). 0 sec. = No Delay
