Fault Alarm Activation; Low Flow Rate Abnormalities - Riken Keiki SD-D58-AC Operating Manual

6. Operations and Functions
<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 of gas alarm.
Normally, take the following actions.

Check the reading of the detector head.
NOTE
If a gas leak is momentary, the reading may already have dropped when 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 of gas alarm, no one can be allowed to access the monitored zone
to ensure safety.

If the gas concentration display continues to be displayed, close the main value of the gas, and then
check that the gas concentration reading dropped.

Assuming that gases remain, wear protective equipment to avoid dangers and go to the gas leak point,
and then check if gases remain using a portable gas detector etc.

Check that the point is free from dangers, and take actions to fix the gas leak.

6-2. Fault alarm activation

A fault alarm is triggered when the detector head detects abnormalities. After a fault alarm is triggered, the
fault lamp (yellow) lights up and an error message is displayed on the LCD. Determine the causes and take
appropriate actions.
After the detector head is successfully returned from the fault, it restarts with the process normally
performed right after it is turned on (initial clear).
If the detector head has problems and is repeatedly malfunctioning, contact RIKEN KEIKI immediately.
NOTE
For information on malfunctions (error messages), see "9. Troubleshooting".

6-3. Low flow rate abnormalities

<Contact Activation>
The contact activates if the output of the low flow rate detecting sensor becomes equal to or less than the
alarm setpoint (when the flow sensor function is set to ON).
Contact activation is automatically reset when the flow rate exceeds a certain value.
0
Alarm delay time
(15 seconds)
Alarm setpoint value
Time
FAULT lamp lights up
Fault alarm contact outputs (*1)
*1: Depending on the specifications
- 40 -
6-2. Fault alarm activation
for the alarm contact