_________________________________________________________________________________________________
________________________________________________________________________________________
10/15
U326_UVAintAS102_B_e_210316
8
Funktionsbeschreibung
UVA transducers are designed for connection of vortex probes VA40 and vortex measuring tubes VA Di for
measuring flow velocity or flow rate of air/gases.
The signal frequency generated from the flow sensor is converted to a linear analog output signal
4-20 mA or 0-10 V. The analog terminal value is parameterisable.
Current output
: 4 ... 20 mA =
0 ... x m/s (or m³/h)
alternatively:
Voltage output
: 0 ... 10 V
= 0 ... x m/s (or m³/h)
The actual velocity or actual flow rate can converted to standard velocity or standard volume flow by en-
tering the parameter 'temperature' and 'pressure' .
A relay output (normally open contact) can be parameterised for 1 of 2 functions:
1. as limit value for the flow velocity or the flow rate:
flow velocity < or = limit value
: relay contact idle
flow velocity > limit value
: relay contact in working position
2. as quantity pulse for quantity measurement:
max. pulse repetition frequency 1 Hz per unit of volume, pulse duration 0.5 s,
e.g. 1 pulse per 1, 10 or 100 m³ or 1, 10 or 100 litre respectively
Self diagnosis according to NAMUR NE43:
For analog output 4 … 20 mA:
No error
: analog output
= 4 mA (flow velocity = 0)
or
analog output
> 4 mA (flow velocity > 0)
Error
: analog output
< 3.6 mA
For analog output 0 … 10 V:
No error
: analog output
= 0 V (flow velocity = 0)
or
analog output
> 0 V (flow velocity > 0)
Error
: analog output
< -0.2 V
Monitoring of power supply, data logging, sensor interface, parameter settings (see under 16
Troubleshooting)
PC serial port RS232
for changing calibration data and setting parameters.
Remove cover.
Plug PC connector cable (optional) with RJ22 into the socket in the UVA (see Fig. 1, under 7.2.5 RS232
Interface).
Connect other end of cable to RS232 PC socket.
If a USB connection is required, then an optional USB / RS232 interface converter must be inserted.
Changes to the setting can now take place after starting the PC programme UCOM (optional)
(see under Fehler! Verweisquelle konnte nicht gefunden werden. Settings).
