Analog Sensor Controller

RD series

This model has been discontinued.
Compliance with the certification standard is ensured as of the time of shipment from our company.

Main Unit, RS-232C Type RD-50RK

RD-50RK - Main Unit, RS-232C Type




Measurement function

DC voltage measurement, DC current measurement

A/D converting system

Successive comparison

Measurement range

±5 VDC, ±10 VDC, 4 to 20 mA DC (switchable)

Display range

-19,999 to +39,999

Measurement accuracy

±0.03 % of F.S. (±5 V range), ±0.03 % of F.S. (±10 V range), ±0.05 % of F.S. (4 to 20 mA range) * F.S. is 20 mA.



1 MΩ (for voltage input), 350 Ω (for current input)



Number of inputs


Sampling rate

2,000 times/second

Display speed

20 times/second

Display power

7-segment 3-color LED (character height: 15.24 mm 0.60")

Over-range alarm

FFFF is displayed

Control input

NPN open-collector or non-voltage contact signal

Control input

Timing input

Hold reset input

Auto-zero input

External setting input

Control output

Setting method

4 steps x 8 programmable setups (selectable)


5 x NPN (HH, HI, GO, LO, LL): 100 mA max. (40 V max.)

Response time

1 ms (at the highest speed)*1

OFF-delay time

60 ms (ON/OFF selectable)

Analog output voltage

Output voltage

±10 VDC


100 Ω

Response time

1 ms (at the highest speed)*1


Data output and control input through RS-232C

Major functions

MDL, digital filter, auto-zero, offset, input, data processing (10 modes),
tolerance limit storage (up to 8 sets), decimal point shift, error message display, etc.


Power voltage

24 VDC ±10 %, Ripple (P-P) 10 % or less

Current consumption

270 mA or less

Environmental resistance

Ambient temperature

0 to +50 °C 32 to 122 °F

Relative humidity

35 to 85 % RH (No condensation)

Vibration resistance

10 to 55 Hz, Double amplitude 1.5 mm 0.06", 2 hours in each of the X, Y, and Z directions


Approx. 700 g (excluding fi ttings)

*1 Calibration is performed once per second, and when it is, this becomes 1.5 ms.

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