MODEL: 18AR

18AR SPECIFICATIONS

ES-1764 Rev.5 Page 1/4

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

Rack-mounted DCS Signal Conditioners 18-RACK

RTD ALARM

Functions & Features

• Providing relay contact closures at preset input levels

• Direct input from an RTD

• Burnout protection

• Single or dual (Hi/Lo) trip

• Front-accessed screwdriver setpoint adjustments

• Enclosed relays

Typical Applications

• Annunciator

• Various alarm applications

MODEL: 18AR–[1][2]–R[3]

ORDERING INFORMATION

• Code number: 18AR-[1][2]-R[3]

Specify a code from below for each of [1] through [3].

(e.g. 18AR-45-R/BL)

• Temperature range (e.g. 0 – 250°C)

Use Ordering Information Sheet (No. ESU-1033) to specify

alarm output code 0 specifications.

[1] INPUT RTD (2- or 3-wire)

1: JPt 100 (JIS'89)

(Usable range: -200 to +500°C, -328 to +932°F; min.span: 30°C, 54°F)

3: Pt 100 (JIS'89)

(Usable range: -200 to +650°C, -328 to +1202°F; min.span: 30°C, 54°F)

4: Pt 100 (JIS'97, IEC)

(Usable range: -200 to +650°C, -328 to +1202°F; min.span: 30°C, 54°F)

5: Pt 50 Ω (JIS'81)

(Usable range: -200 to +500°C, -328 to +932°F; min.span: 60°C, 108°F)

6: Ni 508.4 Ω

(Usable range: -50 to +200°C, -58 to +392°F; min.span: 20°C, 36°F)

0: Specify

Note: Consult M-System for 2-wire RTD

[2] ALARM OUTPUT

1: Hi (coil energized at alarm)

2: Hi (coil de-energized at alarm)

3: Lo (coil energized at alarm)

4: Lo (coil de-energized at alarm)

5: Hi/Lo; N.O., OFF in power failure

(connector output not available)

6: Hi/Lo; N.C., OFF in power failure

(connector output not available)

0: Specify

POWER INPUT

DC Power

R: 24 V DC

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

[3] OPTIONS

Burnout

blank: Upscale burnout

/BL: Downscale burnout

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)

Alarm 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

Relay: Enclosed

Setpoint adjustments: Multi-turn screwdriver adjustments

(front); -5 – +105 % independently

Hysteresis (deadband): Approx. 1 %

Front LEDs: Red LED turns on when the coil is energized.

INPUT SPECIFICATIONS

Maximum leadwire resistance: 20 Ω per wire (3-wire)

Sensing current: 2 mA (Pt)