Dwyer DPW - Manual (Page 12)

4.5.2 - Low Temperature Alarm Numerical Entry
The limit of required Low Temperature Alarm value can be entered in increments of
0.1°C from -9.9 °C to 99.9°C.
A typical display with flow meter Low Temperature Alarm is shown below.
Note: The value of the Low Temperature Alarm must be less than the value of the
High Temperature Alarm. The value of the temperature can be entered only in °C
units.
A typical display with flow meter Low Temperature Alarm is shown below.
If a Low Temperature Alarm occurs, and one of the two optical outputs is assigned
to the Low Alarm Event (see Section 4.8) the optically isolated output will be
activated when the temperature is less than the Low Temperature Alarm value.
The Temperature Alarm condition is also indicated on the display Process
Information Screen by displaying L character. A typical display with flow meter
process information screen and activated Low Temperature Alarm is shown below.
4.5.3 - High Temperature Alarm Numerical Entry
The limit of required High Temperature Alarm value can be entered in increments
of 0.1°C from -9.9 °C to 99.9 °C.
Note: The value of the High Temperature Alarm must be more than the value of the
Low Temperature Alarm.
A typical display with flow meter High Temperature Alarm settings is shown below
Note: The value of the Low Temperature Alarm must be less than the value of the
High Temperature Alarm. The value of the temperature can be entered only in °C
units.
If a High Temperature Alarm occurs, and one of the two optical outputs is assigned
to the High Alarm Event (see Section 4.8) the optically isolated output will be
activated when the flow is more than the High Temperature Alarm value.
The Temperature Alarm condition is also indicated on the display Process
Information Screen by displaying H character. A typical display with flow meter
Process Information Screen and activated High Temperature Alarm settings is
shown below.
4.5.4 - Temperature Alarm Action Delay Numerical Entry
The Temperature Alarm Action Delay is a time in seconds that the Temperature
value must remain above the high limit or below the low limit before an alarm
condition is indicated. Valid settings are in the range of 0 to 3600 seconds. A typical
display with flow meter Temperature Alarm Delay settings is shown below.
4.5.5 - Temperature Alarm Action Latch Tabular Entry
The Temperature Alarm Action Latch settings controls Latch feature when optically
isolated outputs are assigned to Temperature Alarm event. Following settings are
available: Disable or Enabled.
By default, flow alarm is non-latching. That means the alarm is indicated only while
the monitored Temperature value exceeds the specified set conditions. If optically
isolated output is assigned to the Temperature Alarm event, in some cases, the
Temperature Alarm Latch feature may be desirable.
The listed above Temperature Alarm Action Latch selections can be set with the Up
and Dn buttons and are accepted by pressing ENT button.
4.6 - Submenu Main Totalizer
The total volume of the liquid is calculated by integrating the actual liquid flow rate
with respect to time. The Main Totalizer value is stored in the EEPROM and saved
every 1 second. In case of power interruption the last saved Totalizer value will be
loaded on the next power on cycle, so Main Totalizer reading will not be lost. The
optional LCD/keypad and digital communication interface commands are provided
to:
- reset the totalizer to ZERO
- start the totalizer at a preset flow rate
- assign action at a preset total volume
- start/stop totalizing the flow
Note: Before enabling the Main Totalizer, ensure that all totalizer settings are
configured properly. Totalizer Start values have to be entered in % FS engineering
unit. The Totalizer will not totalize until the flow rate becomes equal to or more than
the Totalizer Start value. Totalizer Stop values must be entered in currently active
volume / mass based engineering units. If the Totalizer Stop at preset total volume
feature is not required, then set Totalizer Stop value to zero (default settings).
4.6.1 - Main Totalizer Mode Tabular entry
This function determines whether Main Totalizer is Enabled or Disabled. The
following selections are available: Enabled or Disabled. The default entry is
Disabled.
The listed above Main totalizer Mode selections can be set with the Up and Dn
buttons and are accepted by pressing ENT button.
4.6.2 - Main Totalizer Flow Start Numerical Entry
The Main Totalizer Start Flow value can be entered in increments of 0.1% from 0.0
– 100.0% FS. A typical display with flow meter Main totalizer Start Flow settings is
shown below.
4.6.3 - Main Totalizer Event Volume Numerical Entry
Main Totalizer Event Volume value must be entered in currently active volume /
mass based engineering units. Totalizer action event become true when the
totalizer reading and preset "Event Volume" values are equal.
If the Totalizer Event at preset total volume feature is not required, then set Totalizer
Event Volume value to zero (default settings).
A typical display with flow meter Main Totalizer Event Volume settings is shown
below.
Low Temp Alarm
0.0 C
5.001 Gl/min AD
-0.5 C TA: L
High Temp Alarm
50.0 C
5.001 Gl/min AD
51.4 C TA: H
Temp Alarm Delay
1 Second
Temp Alarm Latch
Disabled
Main Total Mode
Disabled
MT Flow Start
5.0% FS
MT Event Volume
0.0 Gal
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