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   inputs Namur   Pickup   PNP   Pulse sensors   Closing contact accuracy 0.01% full scale input channels 2 sensor supply 24 VDC, max. 150 mA

Display details   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   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   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   2000-RS Serial communications card Serial communications card with RS-232 and RS-485 bus   2000-REL2 Alarm card Alarm card with 2 relays, 260 VAC / 2 A   2000-OUT Output card Output card with voltage and current signals.

Cr. : http://www.nokeval.com