SD-1GH
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<Response to Gas Alarm>
A gas concentration value exceeds the alarm setpoint
When a gas alarm is triggered, take actions in accordance with your management rules for a gas alarm.
Normally, take the following actions.
•
Check the reading of the detector.
NOTE
If a gas leak is momentary, the reading may already have dropped by the time you check it. In addition,
when the alarm is triggered by noise or other incidental conditions other than a gas, the reading may have
already dropped.
•
Based on your management rules for a gas alarm, no one can be allowed to access the monitored zone
to ensure safety.
•
If the gas concentration remains, close the main valve of the gas, and then check that the gas
concentration drops.
•
Equipped with protective gear, access the leak point and use a portable gas detector to confirm the
absence of gas.
•
Check that the area is free from dangers and take actions to fix the gas leak.
6-2. Fault Alarm Activation
A fault alarm is triggered when an abnormality is detected. The fault lamp (yellow) lights up and an error
message appears on the display. Determine the cause(s) and take appropriate actions.
After the detector is recovers from the fault, it restarts with the process normally performed right after it is
turned on (initial clear).
If the detector repeatedly malfunctions, contact RKI immediately.
NOTE
For information on malfunctions (error messages), see "9. Troubleshooting".
6-3. External Output Operation
Signal Transmission System
Electric current transmission (non-isolated) 4 – 20 mA
Transmission Path
CVVS
Transmission Distance
CVVS 1.25 sq: Maximum 1 km
Connection Load Resistance
Below 300 Ω
1
Detection Mode (No Alarm)
4 - 20 mA (concentration output)
2
Detection Mode (Gas Alarm)
4 - 20 mA (concentration output)
3
Initial Clear
Depending on the setting of section 4.
2.5 mA setting: 2.5 mA
4 mA, HOLD, 4 - 20 mA setting: 4 mA
4
Maintenance Mode
2.5 mA setting: 2.5 mA
4 mA setting: 4 mA
HOLD setting: The previous value retained
4 - 20 mA setting: 4 - 20 mA (concentration output)
5
Alarm Test
Output ON setting: 4 - 20 mA (concentration output)
Output OFF setting: 4 mA
6
Fault Alarm
0.5 mA (Fixed)
Summary of Contents for SD-1GH
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