MODEL: MEX-B

MEX-B SPECIFICATIONS

ES-4614 Rev.10 Page 1/3

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

Final Control Elements

VALVE POSITIONER

(potentiometert feedback; built-in SSR)

Functions & Features

• Controlling an electric actuator powered with 100 V AC

• Feedback potentiometer 100 Ω – 10 kΩ

• Built-in SSR directly drives an AC motor

• Timer for motor's overheat protection

• Re-transmitted output

Typical Applications

• Single phase AC motor

• Loop powered isolator can be used for isolating between

setpoint input signal and transmitter output signal

50

(1.97)

136

(5.35)

80

(3.15)

mm (inch)

MODEL: MEX–B–[1][2]

ORDERING INFORMATION

• Code number: MEX-B-[1][2]

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

(e.g. MEX-B-B/Q)

• Specify the specification for option code /Q

(e.g. /C01/BD/S01)

[1] 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

[2] 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

Optional Process

/BD: Bonding

TERMINAL SCREW MATERIAL

/S01: Stainless steel

GENERAL SPECIFICATIONS

Construction: Plug-in

Connection: M3.5 screw terminals

Screw terminal: Chromated steel (standard) or stainless

steel

Housing material: Flame-resistant resin (black)

Deadband adjustment: 2 – 20 % (front)

Timer adjustment: 1 – 30 sec. (front)

Isolation: Input or xmtr output to output to power

Zero adjustment: 0 – 25 % (front)

Span adjustment: 75 – 100 % (front)

INPUT SPECIFICATIONS

■ Setpont Signal: 4 – 20 mA DC; input resistor incorporated

Input resistance: 100 Ω

■ Feedback Potentiometer: 100 Ω – 10 kΩ

Minimum span: 50 % of total resistance

Excitation: 0.5 V DC

OUTPUT SPECIFICATIONS

■ Re-Transmitted Output: 4 – 20 mA DC

Load resistance: 750 Ω max.

■ Control Output: SSR (zero-crossing);

60 – 280 V AC @ 0.1 – 1 A

Note 1: The incorporated SSR is not capable for driving 200

V AC motor.

Note 2: When driving relays with this control output, relays

may operate erratically due to the leakage current at OFF of

SSR. To avoid the problem, install a resistor (R) in parallel

with the relay coil.

R < [Release Voltage] ÷ [[Leakage Current at OFF] –

[Release Current]]

Leakage current at OFF: Approx. 10 mA @ 240 V

(2-3)ON to min.

(1-3)ON to max.

Deviation

(Setpoint) – (Feedback)

+

–

0

Deadband

• Output Operation (terminal No. in parentheses)