ES-1817 Rev.3

18MK

Rack-mounted DCS Signal Conditioners 18-RACK

POTENTIOMETER CONVERTER

(fast response)
Functions & Features
• Providing two DC outputs proportional to a
potentiometer or slidewire position input
• Constant voltage excitation allows use with pots with total resistances from 100 Ω – 10 kΩ without affecting accuracy
• 50 % zero/span adjustments with minimal interaction
• Second channel output available at the front terminals and at the Standard Rack connector
• Fast response type
Typical Applications
• Tank levels
• Positions
 

MODEL: 18MK–66–R

ORDERING INFORMATION

• Code number: 18MK-66-R

INPUT POTENTIOMETER

Total resistance 100 Ω – 10 kΩ

OUTPUT 1

Voltage
6: 1 – 5 V DC (Load resistance 2000 Ω min.)

OUTPUT 2

Voltage
6: 1 – 5 V DC (Load resistance 2000 Ω min.)

POWER INPUT

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

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 1: Connector
  Output 2: 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 1 to output 2 to power
Overrange output: Approx. -10 to +120 % at 1 – 5 V
Zero adjustment: 0 – 50 % of total resistance (front)
Span adjustment: 50 – 100 % of total resistance (front)

INPUT SPECIFICATIONS

Minimum span: 50 % of total resistance
Excitation: Approx. 0.2 V DC

INSTALLATION

Current consumption: Approx. 35 mA
Operating temperature: -5 to +55°C (23 to 131°F)
Operating humidity: 30 to 90 %RH (non-condensing)
Mounting: Standard Rack 18BXx or 18KBXx
Weight: 150 g (0.33 lb)

PERFORMANCE in percentage of span

Accuracy: ±0.1 %
Temp. coefficient: ±0.015 %/°C (±0.008 %/°F)
Response time: Approx. 25 msec. (0 – 90 %)
Line voltage effect: ±0.1 % over voltage range
Insulation resistance: ≥ 100 MΩ with 500 V DC
Dielectric strength: 1500 V AC @ 1 minute
(input to output 1 or output 2 or power)
500 V AC @ 1 minute
(output 1 to output 2 to power)
1500 V AC @ 1 minute
(input or output or power to ground)

EXTERNAL DIMENSIONS unit: mm [inch]

TERMINAL ASSIGNMENTS

SCHEMATIC CIRCUITRY & CONNECTION DIAGRAM