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*Specifications are subject to change without prior notice.

The RR900N series is a scaling conversion display unit for pulse signal input.
It is ideal for pulse output type sensors such as wheel flowmeter sensors.
In addition to an alarm function and digital signal processing functions such as linearization, it is equipped with pulse/analog output and a serial communication function to output converted values.


  • · Pulse input handles both contact signals (open collector) and voltage signals (selectable).
  • · Scaling conversion through multipoint linearization
  • · High and low alarm function
  • · Pulse or analog output function (Analog output can be switched between current and voltage.)
  • · Two-wire RS-485 serial communication and multidrop connection enable two or more units to communicate with each other
  • · CE-mark, RoHS-compliant

Main Specification

Input signal Open collector pulse / voltage pulse (selectable)
Indication 5-digit red LED
Frequency: 0.0 to 1500.0 (fixed point)
Conversion value: 0.000 to 12000
Indication accuracy Accuracy: 0.05 % of reading ±0.1 Hz
Resolution: 0.01 Hz
Output function 【RR930N】
Re-pulsed output
Pulse frequency signal proportional to the converted value
Output range: 1 Hz to 1.5 kHz, Duty: 1:1
Output circuit: Open collector
Output rating: 30 V DC / 10 mA

Analog output
Current output: DC 4-20 mA (load: up to 400Ω)
Voltage output: DC 0-5 V / 0-10 V (load: 500 kΩ or higher)
Accuracy: ±0.2 % of the reading at 23 °C ±5 °C
Operation key MODE, SHIFT, UP, and ENT
(Operation with tact switches on the front panel)
Main setting functions · Full scale frequency, converted value
· Low-cut off
· Updating cycle of indication
· Setup value for high / low alarm
· Alarm operation setup
Communication type RS-485 2-wire asynchronous serial communication
Power supply for the sensor 12 V DC±10 %, up to 25 mA
Power source 10 to 27 V DC Approx. 2 VA (max.)
Dimension W48 × H24 × D80 mm Panel cut: Based on DIN24 × 48