Riken Keiki SD-1DEC, Operating Manual

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6 Operations and Functions
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6
Operations and Functions
6-1. Gas alarm activation
Gas alarm: Activated when the concentration of detected gas reaches or exceeds the alarm setpoint value.
<<Auto-Reset Operation>>
NOTE
The alarm setpoint is factory-set. Although the alarm delay time (standard: 2 seconds) works in the detector
to prevent a false activation, it can be cancelled if not needed.
<Display Operation>
Gas Concentration Display
In case of over the detection range (Over Scale), " ∩∩∩∩ " is displayed on the LED.
Power Indicator Lamp (POWER: Green)
During operation, this lights up continuously.
Alarm Indicator Lamp (ALM: Red)
This lights up when the alarm setpoint value is reached or exceeded.
<Contact Activation>
The contact is activated when the gas concentration reaches or exceeds the alarm setpoint value (only
when the alarm is used).
The contact activation is reset automatically when the gas concentration drops below the alarm setpoint
value.
Alarm delay time (2 seconds)
Alarm lamp (ALM)
Alarm contact (terminal plate 4, 5)
Alarm setpoint
Conc
entratio
n
0
Time
6-1. Gas alarm activation