MODEL: 18PR
Rack-mounted DCS Signal Conditioners 18-RACK
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.
PULSE SCALER
Functions & Features
• Converting pulse rate into convenient engineering unit for
display on a totalizing counter or meter
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.
Typical Applications
• Positive displacement flowmeters and turbine flowmeters
• Magnetic tachometers
3) Use M-System’s Model M2PRU instead of this unit in
conjunction with the pulse output from M-System’s power
transducers.
R
C = 1 µF
R = 10kΩ
PULSE
SCALER
Relay
C
MODEL: 18PR–[1][2]–R
GENERAL SPECIFICATIONS
Construction: Rack-mounted; terminal access via screw
terminals on the front and connector on the rear; terminal
cover provided
ORDERING INFORMATION
• Code number: 18PR-[1][2]-R
Connection
Specify a code from below for each of [1] and [2].
(e.g. 18PR-11-R)
Input: M3.5 screw terminals (torque 0.8 N·m)
Output: M3.5 screw terminals (torque 0.8 N·m)
and connector
• Input frequency range (e.g. 0 – 356.7 Hz)
• Output frequency range (e.g. 0 – 1.00 Hz)
Power input: Supplied from connector
Screw terminal: Nickel-plated steel
[1] INPUT
Isolation: Input to output to power
1: Dry contact (max. 100 kHz)
Input pulse sensing: Capacitor coupled; detecting pulse rise
Sensitivity adjustment: Single-turn screwdriver adjustment
(front); 25 mVp-p – 5 Vp-p
2: Voltage pulse (max. 100 kHz)
Scaling factor adjustment: 10-position rotary switch; 0.9999
[2] OUTPUT
× 10 – 0.0001 × 10–6
0
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.)
18PR SPECIFICATIONS
ES-1860 Rev.11 Page 1/4
http://www.m-system.co.jp/