Analogue 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-50R

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

*Please note that accessories depicted in the image are for illustrative purposes only and may not be included with the product.

Data Sheet (PDF)


CAD Data

360°view (3D PDF)




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 (selectable)

Display range

-19999 to +39999

Measurement accuracy

±0.03 % of F.S. (at ±5 VDC range), ±0.03 % of F.S. (at ±10 VDC range)
±0.05 % of F.S. (at 4 to 20 mA DC range)



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-colour LED (character height: 15.24 mm)

Over-range alarm

FFFF is displayed

Control input

Synchronous, Hold-reset, Auto-zero, External setting,
NPN or non-voltage contact signal

Control input

Timing input

Hold reset input

Auto-zero input

External setting input


Setting method

4 steps x 8 programmable setups (selectable)*1


5 x NPN (HH, HI, GO, LO, LL): 100 mA max. (40 V max.)*1

Response time

1 ms (when average number 1)*1

OFF-delay time

60 ms (ON/OFF selectable)*1

Analogue output voltage

Output voltage

±10 VDC


100 Ω

Response time

1 ms (when average number 1)*2


Data output and control input through RS-232C

Major functions

MDL, digital fi lter, 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

Relative humidity

35 to 85 % RH (No condensation)

Vibration resistance

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


Approx. 700 g (excluding fi ttings)

*1 NPN output can easily be converted to PNP output by connecting the optional OP-5148 PNP output converter.
*2 Requires 1.5 ms every second during self-compensation sequence to prevent temperature fl uctuations.

Data Sheet (PDF) Other Models