Dwyer UFC User Manual download pdf (Page 38)

3: Operating Procedures

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

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