
TECHNICAL DESCRIPTION
ULTRAFLOW
®
54 DN150-250
5512-876 GB/04-2012/Rev. F1
39
Figure 20
8.13
Test mode
To minimize the time spent on calibration, ULTRAFLOW
®
54 can be switched into test mode. When ULTRAFLOW
®
54
is in test mode (verification mode), the measuring routines only take one fourth of the time they take in normal
mode.
ULTRAFLOW
®
54 is put into test mode by connecting pin 4 of the internal connector to frame (
Figure 20
) and sub-
sequently connect the supply. After approx. 1 sec. the sensor goes into test mode and the connection between pin
4 and frame is disconnected.
Test mode is ended by disconnecting the supply to the sensor.
Please note: An ULTRAFLOW
®
54 in test mode uses approx. 3 times as much power as in normal mode. However,
this does not influence the total battery lifetime of the energy meter.
8.14
Externally controlled start/stop
In connection with calibration by means of serial data, e.g. in connection with NOWA, ULTRAFLOW
®
54 can in
verification mode (see
paragraph 8.13
) be monitored by an external signal. This is done by grounding pin 4 of the
internal connector when starting the test and removing it when the test has been completed. The volume of water
that has been accumulated during the test can be read serially.
The accumulation is based on the same data as those used for calculating the number of pulses to be emitted.
In addition to accumulating water volume during the test, the sensor corrects for the excess quantity in connection
with start, as well as the quantity lacking in connection with stop. These deviations are due to the fact that the
sensor measures flow at fixed intervals as illustrated by
Figure 21
below.
Figure 21
Meter interface
Pin 1 Vcc
Pin 2 Gnd
Pin 3 Pulse out
Pin 4 Access control
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