13.1.7 DayTrend L
• Alarm type: Fail alarm
• Non-abbreviated description: Daily trend Low
• Priority: Medium
• Parameter(s) involved:
- DayTrend L; SysOK Relay;FaultTrig. submenu; Section 5.5.7.
- DayTrAlr L (alarm set point); Gas;DailyTrend submenu; Section 5.5.2.3.
- DayTrAlr Delay; Gas;DailyTrend submenu; Section 5.5.2.3.
• Alarm cause(s): Daily trend below the DayTrAlr L alarm set point. Probably
indicates a gas level reading problem.
Proceed as follows:
1. Verify the daily trend calculated by the Hydran 201Ti. This value is displayed in
the Main Display mode (see Section 5.2.2) and also in the DailyTrend screen in the
Gas;DailyTrend submenu (see Section 5.5.2.3). If this value seems normal, verify
whether the value of the alarm set point is adequate. This parameter was
probably set to a value that is too high.
2. Verify the gas level measured by the H201Ti. This value is displayed in the Main
Display mode (see Section 5.2.2) and also in the GasLevel screen in the Gas;
GasLevel submenu (see Section 5.5.2.1). If this value seems normal, verify whether
the value of the alarm set point is adequate. This parameter was probably set to
a value that is too high.
3. Verify whether the breathing membrane of the H201Ti’s enclosure (item 4 in
Figure 3-1) and/or the one of the Hydran 201 sensor (see Figure 3-3) are
obstructed by paint, grease or other products.
4. Verify whether the valve on which the H201Ti is installed is open.
5. Execute the ForceSensor Test command in the Service submenu to test the
operation of the H201 sensor. A problem may have occurred since the last
automatic sensor test (which is performed the first and fifteenth days of each
month at midnight).
13.1.8 DayTrend LL
• Alarm type: Fail alarm
• Non-abbreviated description: Daily trend Low-Low
• Priority: Medium
• Parameter(s) involved:
- DayTrend LL; SysOK Relay;FaultTrig. submenu; Section 5.5.7.
- DayTrAlr LL (alarm set point); Gas;DailyTrend submenu; Section 5.5.2.3.
- DayTrAlr Delay; Gas;DailyTrend submenu; Section 5.5.2.3.
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