MODEL: PRU

PRU SPECIFICATIONS

ES-1375 Rev.15 Page 1/4

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

Plug-in Signal Conditioners M-UNIT

PULSE SCALER

(field-configurable)

Functions & Features

• Converting pulse rate into convenient engineering unit for

display on a totalizing counter or meter

• Excitation

• Digital scaling accuracy

• High-density mounting

Typical Applications

• Positive displacement flowmeters and turbine flowmeters

• Magnetic tachometers

50

(1.97)

127

(5)

80

(3.15)

mm (inch)

MODEL: PRU–[1][2]–[3][4]

ORDERING INFORMATION

• Code number: PRU-[1][2]-[3][4]

Specify a code from below for each of [1] through [4].

(e.g. PRU-11-B/Q)

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

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

• Specify the specification for option code /Q

(e.g. /C01/S01)

[1] INPUT

1: Dry contact (Excitation 12 V @30 mA)

2: DISCONTINUED, replaced with code 8

Voltage pulse; square wave (Exitation 12 V @30 mA)

7: Sine wave (Excitation 12 V @30 mA)

8: Voltage pulse; square wave (Excitation 12 V @30 mA)

[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)

[3] POWER INPUT

AC Power

B: 100 V AC

C: 110 V AC

D: 115 V AC

F: 120 V AC

G: 200 V AC

H: 220 V AC

J: 240 V AC

DC Power

S: 12 V DC

R: 24 V DC

V: 48 V DC

[4] OPTIONS

blank: none

/Q: With options (specify the specification)

SPECIFICATIONS OF OPTION: Q (multiple selections)

COATING (For the detail, refer to M-System's web site.)

/C01: Silicone coating

/C02: Polyurethane coating

/C03: Rubber coating

TERMINAL SCREW MATERIAL

/S01: Stainless steel

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: Plug-in

Connection: M3.5 screw terminals

Screw terminal: Chromated steel (standard) or stainless

steel