Transducer U1a for flow sensors v-transmitters FA Transducer U2a ...

Transducer U1a, U2a
Transducer U1a
for flow sensors
v-transmitters FA
for measuring flow velocity v or
flow rate of air/gases and water /
liquids.
The transducers U1a are designed
for connection with Höntzsch vane
wheel measuring probes FA which
do not sense the direction of flow.
They convert the v-proportional
signal frequency of a v-ransmitter
FA into a load independent
current or into impressed voltage.
The required analog output signal
- current or voltage - is, in the
case of these instruments,
standardized by the manufacturer
and measurement range, sensor
type and medium must, therefore,
be specified when ordering.
Transducer U2a
for flow sensors
v-transmitters VA
v-transmitters FAR
v-transmitters FA
for measuring flow velocity v or
flow rate of air/gases and water /
liquids.
The transducers U2a are designed,
on the one hand, for connection
with Höntzsch vortex measuring
probes VA which do not sense the
direction of flow and, on the other
hand, for connection with
Höntzsch vane wheel measuring
probes FAR which sense the
direction of flow. Höntzsch vane
wheel measuring probes FA which
do not sense the direction of flow
can also be connected, for
example, if the analog output
signal should be a 0-20 mA signal.
The transducers U2a are microprocessor-controlled.
They
convert the v-proportional signal
frequency of a v-transmitter into
a load independent current or into
impressed voltage.
Transducers for transmitters FAR
sensing the direction of flow
additionally indicate the direction
of flow: a potential-free relay output
indicates the +/-direction independent
of analog output signal
specification.
The analog output signal can be
so specified that the zero flow
corresponds to the mid-value or
also to the initial value of the
analog signal range. The required
analog output signal - current or
voltage - is, in the case of these
instruments, standardized as
follows by the manufacturer:
• in the case of v-transmitters
VA, measurement range and
calibration code
• in the case of v-transmitters
FAR measurement range, zero
flow according to the initial or
mid-value of the analog signal
range, type of sensor and and
medium
• in the case of v-transmitters FA,
measurement range, type of
sensor and medium
The desired setting of the transducer
must therefore be specified
when ordering.
U133_U1aU2a_D_e_050829 http://www.hoentzsch.com
1/4

Transducer U1a, U2a
Electrical Construction
Transducer U1a
Input v/FA
for vane wheel measuring probes
FA (v-transmitters) with 2
conductors, which do not sense
the direction of flow: cylinder
probes, vane wheel measuring
probes with measuring tube ...
The input is protected in the best
possible way against interference.
Nevertheless, we recommend that
the connection cable should be
laid separately from the motor,
magnet and valve wires.
Output
for one analog signal of choice:
4-20 mA, 0-4 V, 0-10 V
Current output
for a burden of max. 500 Ohm
with 230 VAC, 110 VAC or 24 VAC
power supply, in all cases with a
DC power supply for a burden of
max. 300 Ohm. Burden with
2-wire configuration 4-20 mA:
max. 200 Ohm at 12 V
max. 800 Ohm at 24 V.
In all cases of external power supply (except Transducer U1a in the
handle) the supply lines are electrically separated from the input
and output lines of the transducer.
In the case of transducers U1a and U2a in the AS102 housing, the
external shield of the wires is to be connected to the cable lead-ins.
Transducer U1a in the handle
of the cylinder probe
The integration of the transducer
in the sensor presupposes that to
the temperatures of the medium
to be measured lie between
-25 °C and +80 °C. In the case of
cylinder probes the handle must
have a diameter of at least
25 mm. The length of a transducer
handle may deviate slightly
from the standard specified length
(see FA data sheet). Probe
extensions are possible with the
customary Höntzsch extension
pieces or probe tubes.
PVC connection cable: length 5 m
Protective system: IP 67
Voltage output
0-4 V or 0-10 V depending on
transducer type. The reference
potential for the voltage ouput is
separate from the reference
potential for the power supply.
For this reason, the voltage output
can also be used for the transfer
of measured signals over greater
distances.
Power supply
Transducers with an analog output
of 0-4 V or 0-10 V require an
external power supply.
Transducers with an analog output
of 4-20 mA are models requiring
external power supply or 2-wire
configuration, i.e. available for
power supply by receiver of
analog signals 4-20 mA.
Attention: no electrical separation!
External power supply
by choice:
230 V +6/-10% 50/60 Hz
110 V +6/-10% 50/60 Hz
24V +6/-10% 50/60 Hz
4.5...6 VDC
10...15 VDC
20...30 VDC approx. 30 mA
2/4 http://www.hoentzsch.com U133_U1aU2a_D_e_050829

Transducer U1a, U2a
Transducer U2a
Input v/VA
for vortex measuring probes VA
(v-transmitters) with 3 conductors
which do not sense the direction
of flow.
Input v/FAR
for vane wheel measuring probes
FAR (v-transmitters) with 3 conductors
which sense the direction
of flow: cylinder probes, vane
wheel measuring probes with
measuring tube ...
Input v/FA
for vane wheel measuring probes
FA (v-transmitters) with 2 or 3
conductors which do not sense
the direction of flow: cylinder
probes, vane wheel measuring
probes with measuring tube ...
All inputs are protected in the best
possible way against interference.
Nevertheless, we recommend that
the connection cable should be
laid separately from the motor,
magnet and valve wires.
Analog output
for one analog signal of choice:
0-20 mA, 4-20 mA, 0-4 V, 0-10 V
5 s-mean values every second.
Current ouput
for a burden of max. 500 Ohm
with 230 VAC, 110 VAC or 24 VAC
power supply, in all other cases
for a burden of max. 350 Ohm.
Voltage output
The reference potential for the
voltage output is separate from
the reference potential for the
power supply. For this reason,
the voltage output can also be
used for the transfer of measured
signals over greater distances.
Relay output, potential-free with
1 change-over contact
Voltage up to 32 VDC
Strength of current up to 100 mA
Stray power up to 3 W
Contact position at:
- zero flow: mean/non-operation
- insufficient power supply:
mean/non-operation
Delivery Program
Transducer U1a U2a
Housing miniature LDG16
IP65 AS102
Handle
Input
v/VA
v/FAR
2 conductors v/FA
3 conductors v/FA
2-wire configuration 4-20 mA •
Power supply
230 VAC
110 VAC
24 VAC
5 VDC
12 VDC
24 VDC
Analog output 0-20 mA
4-20 mA
0-4 V
0-10 V
• • • •
• • • •
• •
• • • •
• •
• •
• •
•
• •
• •
•
• • •
• • • •
• • •
• • • • •
• • • • •
• •
• •
• •
• •
• •
• •
• •
• • •
• • •
• • •
• • • • •
• • • • •
• • • • •
• • • • •
Relay output • •
Working temperature 0/+50 °C
range -25/+80 °C
•
• • • •
Power supply
by choice:
230 V +6/-10% 50/60 Hz
110 V +6/-10% 50/60 Hz
24 V +6/-10% 50/60 Hz
4.5...6 VDC
10...15 VDC
20...30 VDC approx. 30 mA
In all cases the supply lines are
electrically separated from the
input and output lines of the
transducer.
• • •
• •
U133_U1aU2a_D_e_050829
http://www.hoentzsch.com
3/4

Transducer U1a, U2a
The transducer U1a is availabe for
assembly in
• an aluminium housing/
protective system IP 65
• a miniature housing
• the handle of a cylinder probe.
The transducer U2a is available
for assembly in
• an aluminium housing/
protective system IP 65
• a miniature housing.
Aluminium housing AS 102
Protective system: housing IP 65
DIN 40 050
Materials:
Housing: aluminium
Screw caps: stainless steel,
captive
Gasket: groove and tongue
neoprene string
gasket
Fastening:
single-channel
fastening system
Line entrances:by max.3 screwed
cable glands
Connections: by terminal screws
Overall size: L/W/H =
150/100/80 mm
Screwed cable glands
Model:
HSK-M-EMV
Protective system:IP68/DIN40 040
Material:
nickled brass
Clamp:
polyamide
Screw thread: PG 11
Cable diameter: 5...10 mm
Miniature housing LDG 16
This housing is for mounting by
snap fastener onto 35 mm standard
assembly rails according to
DIN 46 277 and DIN EN 50 022
or screw fitting. The housing is an
insulating case corresponding to
the specifications of the machine
and automobile industry with a
max. of 16 protected terminals as
per VDE 0100 and VGB 4.
Protective system: housing IP 40
terminals IP 20
Material: Macrolon
Connections: screwed terminals
Overall size: H/W/D =
75/55/110 mm
CE Conformity
Transducers U1a and U2a with
the corresponding sensors do not
cause electromagnetic interference
outside the permissible
limiting values.
Höntzsch GmbH
Gottlieb-Daimler-Straße 37
D-71334 Waiblingen (Hegnach)
Telefon +49 7151 / 17 16-0
Telefax +49 7151 / 5 84 02
E-Mail info@hoentzsch.com
Internet www.hoentzsch.com
Transducers U1a and U2a in LDG
16 housing are resistant to
interference when
• they are accommodated in a
conductive housing, e.g. service
cabinet
• the cable entries are CE-correct
• the appertaining installation
instructions are adhered to.
On request transducers can be
supplied in an LDG housing which
is already in conformity with CE.
U133_U1aU2a_D_e_050829 http://www.hoentzsch.com
4/4