2 channel frequency display : 2251

The panel meter 2251 is designed for two pulse sensors such as NPN-, PNP-, Namur -sensors, closing contact or pickup. The meter calculates the difference between the input frequencies, subtraction A-B, or alternatively, the meter divides the input frequencies, division A/B.
The input frequency range 0,0001Hz..5 kHz is exceptionally wide starting with very low frequencies. The display is scaleable on the whole frequency range, e.g. 0-1,23 Hz can correspond to the range 0-5000 on the display . Output is freely scaleable on the basis of the display, e.g. 4-20 mA. Two different measuring methods are applied: in low frequencies the time interval between two incoming pulses is measured and in higher frequencies the frequency . 


Input details end
inputs Namur
  Pulse sensors
  Closing contact
accuracy 0.01% full scale
input channels 2
sensor supply 24 VDC, max. 150 mA
Display details end
display color red or green
number of digits 6
digit size 14.5 mm
display 7 segment LED
indicator lights Alarm levels 1 and 2
Power supply end
supply voltage 230 VAC: 85-260 V AC/DC
  24 VDC: 12...32 VDC / 24 VAC
current consumption 24 VDC: 70...110 mA depending on the digit count
power consumption 2,5 VA
General information end
dimensions 96 x 48 x115 mm (WHD)
maximum ambient temperature 60°C
minimum ambient temperature -10°C
case material plastic, black
installation Panel
protection class IP65 (front panel with a rubber gasket provided)
weight 240 g
Option cards end
Serial communications card
Serial communications card with RS-232 and RS-485 bus  
Alarm card
Alarm card with 2 relays, 260 VAC / 2 A  
Output card

Output card with voltage and current signals.



Cr. : http://www.nokeval.com