VariTrans P 41000 TRMS0 pages

High-Voltage Isolation Amplifiers / Shunt Isolators

VariTrans P 41000 TRMS
AC/DC high-voltage isolators for true rms measurement
Input signals ranging from Vin = 60 mV AC to Vin = 10 V AC
The Task
In electrical systems, alternating voltages
from 60 mV to 10 V need to be recorded,
galvanically isolated and converted into
standard 0...20 mA, 0...10 V or 4 ... 20 mA
output signals. The DC output signal should
reflect the rms values of the input voltage.

The Housing
A new 22.5 mm wide modular housing is
used for the VariTrans P 41000 TRMS highvoltage isolators. It is snapped onto a standard DIN rail. The front panels of the adjustable models provide a rotary encoder switch
for selecting the ranges.

The Problems
The alternating voltages which are used are
not always sinusoidal, but sometimes distorted. But typical AC/DC transmitters are
only designed for sinusoidal sources. With
input signals which are not sinusoidal, they
exhibit – sometimes considerable – errors in
forming the rms value, which can be severe
enough to render the measurement values
unusable. Therefore true rms measurement
is required for signals which are non-sinusoidal and/or are distorted.

The Advantages
The VariTrans P 41000 TRMS are available for
any input voltages from 60 mV AC to 10 V
AC. Analog DC signals are available at the
output: 0...20 mA, 0...10 V and 4 ... 20 mA.
The true rms conversion is performed with
high precision up to a crest factor of 5. It
operates over a frequency range of 16.7 Hz
to 1000 Hz.
16 input/output signal combinations can
easily be selected with a rotary encoder
switch on the front of the device.
Tedious on-site adjustment using a screwdriver, calibrator or multimeter is no longer
required. Drift problems due to unstable
trimming components – e.g. potentiometers
– are avoided. Thanks to the easy scalability
of the range selection, the devices can easily
be customized to individual customer solutions. Up to 16 customized signal combinations can be implemented in one device and
configured optimally for the respective
application.

In the case of insufficient insulation, high
voltages and harsh ambient conditions may
overload the galvanic isolation. This can
result in false measurement values or even
personal injury or damage to the equipment. These risks have to be eliminated
safely and over the long term by suitably
designed high-voltage isolators.
The Solution
The VariTrans P 41000 TRMS isolation amplifiers have been specially conceived for measurements of bipolar voltages ranging from
millivolts to volts. They reliably isolate high
potentials at the input circuit. Thanks to the
true rms conversion in the transmitter, even
distorted input signals are captured correctly and output as so-called true rms
values.
The isolating distances are designed for
high working voltages up to 3600 V AC/DC
and test voltages up to 15 kV. Protection
against electric shock is achieved through
protective separation up to 1800 V AC/DC
across input and output and power supply
according to EN 61140.
144

The integrated 20 to 253 V AC/DC VariPower
broad-range power supply offers maximum
flexibility. This ensures trouble-free operation with alternating or direct voltages
everywhere in the world and provides for
maximum safety even in unstable power
supply networks. Installation is also easy and
safe: Incorrect connection of the mains
s
­ upply is practically impossible. Expensive
standstill times and repair work during
c
­ ommissioning are a