Daytrend Ll - GE Hydran 201 i Instruction Manual

Chapter 12 • Troubleshooting
• 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 4.2.2 on page 4-4) and also in the DailyTrend
screen in the Gas;DailyTrend submenu (see Section 4.5.2.3 on page 4-17). 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 4.2.2 on page 4-4) and also in the GasLevel screen in the
Gas;GasLevel submenu (see Section 4.5.2.1 on page 4-16). 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 2-1 on page 2-3) and/or the one of the Hydran 201 sensor (see Figure 2-3 on
page 2-6) 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).
12.1.8

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 4.5.7 on page 4-23
– DayTrAlr LL (alarm set point); Gas;DailyTrend submenu; Section 4.5.2.3 on
page 4-17
– DayTrAlr Delay; Gas;DailyTrend submenu; Section 4.5.2.3 on page 4-17
• Alarm cause(s): Daily trend below the DayTrAlr LL alarm set point. Probably indicates
a gas level reading problem.
12-6 Rev. 6, March 2011 Part 17997