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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. 

More details

 

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

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