User manual

Smart Interface User Manual
IM-SIP-B 13
Write Zero Cut Off Value
Zero Cut Off Value selects the setting where output values are forced
or “cut off” to indicate a zero value. Set the cut off value to 0% for
no effect to a maximum setting of 10%. This setting is valid for both
Range 1 and Range 2.
To enter a new zero cut off value:
1. Choose the Function Selector and select Write Zero Cut Off
Value.
2. In the Value to Write selector type in a number between 0 and
10. (The program will automatically correct any out-of-range
settings.)
3. After entering the new value, click the Go button. Check the
Zero Cut Off indicator and confirm that the new value is correct.
Write High Alarm Set Point Value
The High Alarm Set Point Value selects the setting where the high
alarm will trip. The valid input range is from 0% to 100% of the
user full scale setting multiplied by the K-factor (set in flow units).
The alarms should have a minimum deadband of 3% to avoid
"chattering." When setting a window alarm, the alarm set points
must be at least twice the deadband value apart. We suggest at least a
10% separation between window alarm set points.
If you choose not to use the high alarm for a specific alarm function,
Sierra recommends that you set the high alarm at 100% of the user
full scale setting which creates an “over-range” indicator. Your flow
meter will continue to indicate flow and generate a signal if the flow
is over the maximum range, but will not operate within the specified
accuracy.
To enter a high alarm set point value:
1. Verify the desired range is selected. Choose the Function Se-
lector and select Write High Alarm Set Point Value.
2. In the Value to Write selector type in the desired set point di-
rectly in flow units. (The program will automatically correct any
out-of-range settings.)
3. After entering the new value, click the Go button. Check the
High Alarm indicator and confirm that the new value is correct.
Caution!
The flow meter must
not be reporting or
measuring gas flow
during adjustments.