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AS4T

P. 1 / 4

EM-1608 Rev.9

THERMOCOUPLE ALARM

(dual or quad alarm trip; field-configurable)

MODEL

AS4T

INSTRUCTION MANUAL

BEFORE USE ....

Thank you for choosing M-System.  Before use, please check 
contents of the package you received as outlined below.
If you have any problems or questions with the product, 
please contact M-System’s Sales Office or representatives.

 PACKAGE INCLUDES:

  Signal conditioner (body + base CJC sensor) ........ (1)

 MODEL NO.

Confirm Model No. marking on the product to be exactly 
what you ordered.

 INSTRUCTION MANUAL

This manual describes necessary points of caution when 
you use this product, including installation, connection and 
basic maintenance procedures.

POINTS OF CAUTION

 INSULATION CLASS

• This  unit  is  provided  with  the  class  of  basic  insulation.  

Prior to installation, check that the insulation class of this 
unit satisfies the system requirements.

 CONFORMITY WITH LOW VOLTAGE DIRECTIVE OR UL

• This equipment is suitable for use in a Pollution Degree 

2 environment and in Installation Category II, with the 
maximum operating voltage of 300V.

  Basic insulation is maintained between signal input, out-

put and power input.  Prior to installation, check that the 
insulation class of this unit satisfies the system require-
ments.

• Altitude up to 2000 meters
• The equipment must be mounted inside a panel.
• The  equipment  must  be  installed  such  that  appropriate 

clearance and creepage distances are maintained to con-
form to CE/UL requirements.  Failure to observe these re-
quirements may invalidate the CE/UL conformance.

 CONFORMITY WITH EMC DIRECTIVE

• Insert a noise filter for the power source connected to the 

unit.  Densei-Lambda Noise Filter Model MZS-1206-33 or 

equivalent is recommended.

• 

The actual installation environments such as panel con-
figurations, connected devices, connected wires, may affect 
the protection level of this unit when it is integrated in 
a panel system.  The user may have to review the CE re-
quirements in regard to the whole system and employ ad-
ditional protective measures to ensure the CE conformity.

 POWER INPUT RATING & OPERATIONAL RANGE

• Locate the power input rating marked on the product and 

confirm its operational range as indicated below:

  100 – 240V AC rating: 85 – 264V, 47 – 66 Hz, approx. 6VA 

(100 – 240V ±10% for UL)

  24V DC rating: 24V ±10%, approx. 3.5W

 

110V DC rating: 85 – 150V, approx. 3.5W (110V ±10% for UL)

 GENERAL PRECAUTIONS

• Before you remove the unit from its base socket or mount 

it, turn off the power supply and input signal for safety.

 ENVIRONMENT

• Indoor use
• When heavy dust or metal particles are present in the air, 

install the unit inside proper housing with sufficient ven-
tilation.

• Do not install the unit where it is subjected to continuous 

vibration.  Do not subject the unit to physical impact.

• Environmental temperature must be within -5 to +55°C     

(23 to 131°F) with relative humidity within 30 to 90% RH 

in order to ensure adequate life span and operation.

 WIRING

• Do  not  install  cables  (power  supply,  input  and  output) 

close to noise sources (relay drive cable, high frequency 
line, etc.).

• Do  not  bind  these  cables  together  with  those  in  which 

noises are present.  Do not install them in the same duct.

 AND ....

• The unit is designed to function as soon as power is sup

-

plied, however, a warm up for 10 minutes is required for 
satisfying complete performance described in the data 
sheet.

COMPONENT IDENTIFICATION

INSTALLATION

Detach the yellow clamps located at the top and bottom of 

the unit to separate the body from the base socket.

 DIN RAIL MOUNTING

Set the base socket so that its 

DIN rail adaptor is at the bot

-

tom.  Position the upper hook 
at the rear side of base socket 

on the DIN rail and push in 
the  lower.    When  removing 

the socket, push down the 

DIN  rail  adaptor  utilizing  a 

minus screwdriver and pull.

 WALL MOUNTING

Refer  to  “EXTERNAL  DI

-

MENSIONS.”

Body

Specifications

Base Socket

Connection Diagram

Clamp

(top & bottom)

DIN Rail

35mm wide

Spring Loaded

DIN Rail Adaptor

Shape and size of the base socket 
are slightly different with various 
socket types.

CJC

Sensor

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