NMTU/F – AC VOLTAGE AND FREQUENCY TRANSDUCERS

NMTU/F - AC VOLTAGE AND FREQUENCY TRANSDUCERS


The NMTU/F device is an AC voltage and frequency transducer with two independent analogous outputs. The A output measures AC voltage, the B output measures the frequency of input voltage. That´s why one single NMTU/F transducer is able to replace two customary transducers, thus making it possible to achieve significant savings in installation space.

ENGINEERING PARAMETERS

  • power supply voltage 20V to 300V DC or 24V to 260VAC/50 Hz (60Hz)
  • power consumption 3 VA at full load at the outputs
  • frequency of the measured voltage 45 to 65 Hz
  • accuracy of frequency measurement ± 0.025 Hz

± 0.05 Hz for output quantity rated values of I<10mA, U<5V

  • accuracy of voltage measurement ± 0.2 % Un (rated voltage)

± 0.5 % Un for output quantity rated values of I<10mA, U<5V

  • number of voltage measuring inputs 1
  • rated input voltage selectable within 57.7V to 500 V
  • overload capacity of voltage inputs

constant operation 120% of rated Un voltage

short-time 200% Un during 1 s

  • number of analogous outputs 2

current outputs 0...20mA; 4...20 mA, or 0…x mA (x= 5 mA to 20 mA)

voltage outputs 0...10 V or 0…x V (x= 1V to 10 V)

  • rated load at the output

voltage output Run = Uan / 2mA

current output Rin = 5 V/ Ian (Ian = rated output current)

  • permitted output load range

voltage output Ru > than 0.25 Run

current output Ri loop resistance < than 2xRin

  • highest output voltage ±18V DC
  • settling time after connecting the power supply 1 minute
  • dielectric strength (to ČSN EN 61010-1 standard)

between inputs and outputs, between inputs and the power source, between inputs and the auxiliary

power source, terminals against the cover 3700V, 50Hz/1min

between the inputs 1000 V, 50 Hz/min

  • material of the case PC/ABS
  • weight max. 200g
  • dimensions 101x114x35 mm
  • operating temperature range -25° C to +70°C
  • operating position any desired
  • protection degree IP 20
  • electromagnetic compatibility radiation: in accordance with ČSN EN 55011-B standard

immunity: in acc. with ČSN EN 6100-6-2, ed.3 standard

  • safety corresponding to ČSN EN 61010 – 1 standard: equipment of the protection class II, overvoltage category III in the installation (highest voltage of 300Vrms against the earth), pollution degree 2

Order code

The parameters of the input and output are defined by a four-digit code. It is essential to accurately specify the X parameters in the purchase order.

Example of an order code:

NMTU/F 3 2 2 1

3………………….… rated input voltage of 100 V

2 ……………… frequency measuring range 45…50…55Hz

2 ………… output A 4…12…20 mA

1 …… output B 0…10…20 mA

Ordering

NMTU/F

*

*

*

*

Rated input voltage [V]

100/ √3

1

110/ √3

2

100

3

110

4

230

5

400

6

other value

X

Frequency measuring range [Hz]

48…50…52 Hz

1

45…50…55 Hz

2

58…60…62 Hz

3

55…60…65 Hz

4

other value

X

Output A voltage

0…20 mA

1

4…20 mA

2

0…10 V

3

other value

X

Output B voltage frequency

0…20 mA

1

4…20 mA

2

0…10 V

3

other value

X

MANUFACTURED BY:

METRA BLANSKO s.r.o. Company ID No.: 023 56 180

Pražská 2536/7 Tax reg. No.: CZ02356180

67801 Blansko, Czech Republic Web: www.metra.cz