Dwyer UFC - Manual (Page 38)

3: Operating Procedures
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3.6 Display of totalizers
Note: This menu selection only affects the Display of the totalizer. Unless the totalizers are stalled, the recorded
volume will still be incremented and the totals will be logged irrespective of the display setting.
3.7 Operation with an Energy Meter
The UFC can be operated with an energy meter which allows accumulated energy measurements to be made. In
this configuration, one temperature sensor is fitted to the output pipe (hot side) and another to the return pipe
(cold side). The temperature difference ( = Thot - Tcold), measured by the energy meter, together with the
pulse input from the UFC, allows the energy meter to calculate and display the accumulated energy absorbed by
the heating system.
3.7.1 Pulse output
When working with an energy meter, the UFC normal pulse output is not used. Instead, a pulse whose frequency
is proportional to the flow rate is independently generated and output on ALARM1 or ALARM2 outputs. This gives
a more stable reading than the pulse ‘packets’ that would normally be produced.
3.7.2 Configuring the UFC
Configure the UFC frequency pulse output using the following procedure:
1. From the FLOW READING screen, press the
Options key to select the FLOW READING
OPTIONS menu, shown here.
Note: You may need to enter the password first.
2. Scroll down to Alarm Settings and press
ENTER to select the ALARM SETTINGS menu.
1. To change the display of the totalizers,
select the
Select Totals menu item from
the FLOW READING OPTION menu.
2. The display of the totals on the FLOW
READING screen is controlled by this menu.
3. Select one, both or no totals to be displayed.
The default is the display of
the +Total.
4. Press the ENTER key.
FLOW READING OPTION DD-MM-YY HH:MM:SS
Off
Both
+Total
-Total
ΔT
FLOW READING OPTION DD-MM-YY HH:MM:SS
Data review
Zero Cutoff (m/s) : 0.010
Set zero flow (m/s) : 0.000
Damping (secs) : 10
Totalizer : Run
Reset +Total
Reset –Total
Calibration factor : 1.000
Roughness factor : 0.010
Alarm Settings :
Max Pulse Freq (Hz) : 10.00
Flow at Max Frequency : 200.00
Calculated Pulse Value: 2.00
Diagnostics
Exit