High/Low Alarms Function - Oval ALTI mass CA00A Instructions Manual

9.16 High/Low Alarm Function
The transmitter provides the operator with quick grasp of conditions of the installation － flowrate,
temperature, density and total flow － when high/low alarms are set up. In the event the preset alarm
conditions are met, it tells the operator the event with an alarm message along with a status output signal.
Setup procedure and behavior of alarm functions are described below:
(1) Setup procedure
Ensure positive settings on individual items.
① Status output function assignment (Function) (See 9.2.5 Transition chart (4) [No. 2-4-5-1].)
To use high/low alarm function, it is essential to assign high/low alarms to status output.
Set "H/L Alarm" to status output function assignment.
("H/L Alarm" setting is required even in cases of high alarm only or low alarm only.)
② Output mode of status output (Mode) (See 9.2.5 Transition chart (4) [No. 2-4-5-3].)
Set up the output mode of status output.
・Active output of status output: Off Active or On Active
(For detail of the status output function, see 9.14 Status Output Function.)
③ Assignment of H/L alarm values (Assign) (See 9.2.5 Transition chart (4) [No. 2-6-1].)
From the following options, select the variables against which the transmitter identifies
alarmed conditions.
・Mass Flow: Instant mass flowrate
・Vol Flow:
・Dens:
・Temp:
・Counter 1: Counter 1
・Counter 2: Counter 2
④ Alarm type selection (H/L Alm. Type) (See 9.2.5 Transition chart (4) [No. 2-6-2].)
Select alarm type from the following options.
・To validate only high alarm, select "High Alarm".
・To validate only low alarm, select "Low Alarm".
・To validate both high and low alarms, select t "H/L Alarm".
⑤ High alarm value setting (High Alm. Po.) (See 9.2.5 Transition chart (4) [No. 2-6-3].)
If the input exceeds this setting, the high alarm is activated. Set the high alarm value
desired.
In the case "Low Alarm" is set in ④, setting is not required.
⑥ Low alarm value setting (Low Alm. Po.) (See 9.2.5 Transition chart (4) [No. 2-6-4].)
・Low Alm. Po.: Low alarm value
In the case "High Alarm" is set in ④, setting is not required.
⑦ Hysteresis value setting for high/low alarms (H/L Alm. hys)
(See 9.2.5 Transition chart (4) [No. 2-6-5].)
The setting determines a dead (or immunity) zone following the occurrence of an alarm.
Select a larger value when measurement fluctuates excessively; select a smaller value if
fast recovery from alarmed condition is desired.
Instant volume flowrate
Density
Temperature
NOTE: For this function, the setting change is disabled
in Write Protect mode (refer to section 9.2).
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