MODEL: 18PR

18PR SPECIFICATIONS

ES-1860 Rev.11 Page 1/4

http://www.m-system.co.jp/

Rack-mounted DCS Signal Conditioners 18-RACK

PULSE SCALER

Functions & Features

• Converting pulse rate into convenient engineering unit for

display on a totalizing counter or meter

Typical Applications

• Positive displacement flowmeters and turbine flowmeters

• Magnetic tachometers

MODEL: 18PR–[1][2]–R

ORDERING INFORMATION

• Code number: 18PR-[1][2]-R

Specify a code from below for each of [1] and [2].

(e.g. 18PR-11-R)

• Input frequency range (e.g. 0 – 356.7 Hz)

• Output frequency range (e.g. 0 – 1.00 Hz)

[1] INPUT

1: Dry contact (max. 100 kHz)

2: Voltage pulse (max. 100 kHz)

[2] OUTPUT

1: Open collector (max. frequency 20 kHz)

2: 5 V pulse (max. frequency 20 kHz)

3: Relay contact (max. frequency 2 Hz)

4: 24 V pulse (max. frequency 20 Hz)

POWER INPUT

DC Power

R: 24 V DC

(Operational voltage range 24 V ±10 %, ripple 10 %p-p max.)

CAUTION

1) This unit's output waveform is not uniform due to its

scaling method. The user must be aware that it may be

inconvenient for certain types of application.

2) This unit is designed to accept at the maximum of 100

kHz, which may cause errors due to chattering in the input

pulses.

Use input relays which do not cause chattering (e.g.

mercury relays). Other relays could be used only with a CR

filter, for 10 Hz at maximum.

3) Use M-System’s Model M2PRU instead of this unit in

conjunction with the pulse output from M-System’s power

transducers.

Relay

R

C

PULSE

SCALER

C = 1 µF

R = 10kΩ

GENERAL SPECIFICATIONS

Construction: Rack-mounted; terminal access via screw

terminals on the front and connector on the rear; terminal

cover provided

Connection

Input: M3.5 screw terminals (torque 0.8 N·m)

Output: M3.5 screw terminals (torque 0.8 N·m)

and connector

Power input: Supplied from connector

Screw terminal: Nickel-plated steel

Isolation: Input to output to power

Input pulse sensing: Capacitor coupled; detecting pulse rise

Sensitivity adjustment: Single-turn screwdriver adjustment

(front); 25 mVp-p – 5 Vp-p

Scaling factor adjustment: 10-position rotary switch; 0.9999