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3.3 Parameters
The following is the list of the parameters and system configurations that can be
modified by the user:
• Max Limit= ### - Maximum gas flow Limits. This value is used to set the high
fault alarm and disable the output alarm. This value is also used to trigger the
Peak Flow detector. The Peak flow value is updated and the peak flow time is
incremented when the flow rate is greater then this limit. (Value range 5 – 255)
• MIN Limit= ### - Minimum gas flow rate limits. This limit in conjunction with
the test delay time is used to set the Low Fault alarm and to disable the output
alarm. When the flow is detected the Test delay timer is decremented and
when the user defined delay time is reached the Low limit is tested and the
output relay will be disabled if the flow rate is below this limit. (Value range 5 to
100)
• Test Delay= ##.# - This is the time in seconds that the GFM will wait before
testing for a Low or High limit fault following an initial detection of gas flow.
(Value range 0.5 to 10.0 seconds)
• Enable Alarms? - Allows the user to enable or disable the High Low limit
testing. Setting this option to “No” will disable the alarm relay output. Setting
this option to “Yes” will enable the alarm relay output. (Status Yes or No)
• Enable Peak? – Setting this parameter to yes will enable the Peak Flow
display. When enabled an additional “Peak= ### *.** sec” display will be
active. Where ### is the last peak flow rate measured and “*.**” is the Total
time at peak flow. The time at peak is the total time measured above the High
limit value. The Peak is the peak flow measured above the High Limit. The
peak value and time is reset at the start of the next detected gas flow period.
This peak display will remain on the display until the peak is set to “No”.
• Log Mode? – Setting this parameter to yes will enable the flow volume
accumulator and it will enable the “Tot Volume= ##.#” and the “Total Time=
HR:MN:SS” display. Where ##.# is the total accumulated volume and
HR:MN:SS is the total time of gas flow since the last user reset. When
disabled the volume display will be inactive and the gas flow accumulator will
be disabled.
• Metric Units? – This parameter is used to select the units of measure for the
gas flow rate. When set to “Yes” the units of measure is in Liters per Minute
(LPM). When set to no, the units of measure are standard Cubic Feet per Hour
(CFH).
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