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U398_UVATP_B_e_190425
11/17
Lay the shielding of analog signal lines on one side only – preferably on the evaluation unit - and low
resistive. Twist unshielded lines to counteract balanced interference to source terminals.
Lay the shielding of digital signal lines on both sides across a wide area. In the case of potential
differences between these points it is advisable to lay a separate equipotential bonding conductor.
Preferably provide shielded connector for connections to connector cable separation points.
If using terminals, these should be in a HF-shielded housing, in which EMC-compatible cable bushes
should be used. Connect outer shielding of the connector cables to the cable bush.
6.4 Connection cable
For connecting between sensor and separate transducer UVATP LiYCY cable with simple copper braiding
screen can be used if the cable path is short and there is marginal electromagnetic interference. Over
longer distances or with a high rate of electromagnetic interference, a double-screened cable of type
LiYCY-CY should be used.
VA sensor
3 x 0.25 mm
2
Max. permissible conductor resistance per strand is 15 Ohm.
Conductor resistances for finely stranded conductors:
approx. 79 Ohm/km with wire cross section 0.25 mm
2
approx. 39 Ohm/km with wire cross section 0.50 mm
2
approx. 26 Ohm/km with wire cross section 0.75 mm
2
7 Functional Description
UVATP transducers are for mass flow output or standard flow rate output by measuring the actual flow
rate, the operating temperature and the absolute pressure.
The signal frequency coming from the flow sensor and proportional to the actual flow rate signal is
converted into a linear analog output signal 4-20 mA or 0-10 V taking temperature and absolute
pressure into account (see Electrical Data, 5.5).
The analog terminal value is configurable.
4 ... 20 mA
= 0 ... x kg/h (0… x Nm³/h)
alternatively:
0 ... 10 V
= 0 ... x kg/h (0… x Nm³/h)
The relay output (normally open contact) can be configured for 1 of 2 different functions:
1. as limit value for the mass flow (standard flow rate):
mass flow (NV/t) < or = limit value: relay contact in rest position
mass flow (NV/t) > limit value: relay contact in operating position
2. as quantity pulse for the quantity measurement:
max. pulse repetition frequency 1 Hz per mass unit (standard flow rate),
configurable, e. g. 1 pulse per 1, 10 or 100 kg
pulse duration 0.5 s
In the case of measuring systems with a maximum mass flow rate up to 6500 kg/h, the output in the dis-
play and at the analog output follows with a decimal place (e.g. 6489.7 kg/h) and with higher maximum
mass flow rate without a decimal place (e.g. 24585 kg/h).
