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10.9 Multiple range high/low limit alarm function (option)
The procedure to use multiple range high/low limit alarm is shown below.
Range setting
Set the range in accordance with 8.2.9 Span (range) in the following order.
1. Set the range type to “unidirectional flow, multiple ranges selected by
external signal”.
2. Set Range 1 and Range 2 respectively.
DO setting (Note 1)
Set digital output 1 and 2 (DO1, DO2) function to multiple range high limit
alarm output and multiple range low limit alarm output respectively in
accordance with 8.2.18 Digital I/O.
Also set the alarm output state to either of normally open or normally close.
DI setting
Set digital input (DI) function to RANGE SW in accordance with 8.2.19
Digital I/O.
High/Low limit
alarm value setting
Set high limit alarm and low limit alarm to ON and set alarm value to high
and low alarms respectively in accordancewith 8.2.23 Flow Rate High, Low,
High-High and Low-Low limit Alarm Setting.
Set the alarm not to use to OFF.
High High/Low Low limit
alarm value setting
Set high-high alarm and low-low alarm to ON and set alarm value to them
respectively in accordance with 8.2.23 Flow Rate High, Low, High-High
and Low-Low limit Alarm Setting.
Set the alarm not to use to OFF.
(Note 1) When setting DO using HHT AF900 (Ver2.40 or older), set alarm outputs
as below:
Multiple range high limit alarm output SPECIAL-B,
Multiple range low limit alarm output SPECIAL-A