Omron K8AB-TH11S, K8AB-TH12S Installation Manual

Advanced Industria l Automation

K8 A B-TH

Protect your heating application

Temperature monitoring relay.

The K8AB-TH is a temperature-monitoring relay that embodies both

temperature-alarm functionality and simple ON/OFF temperature

control. The unit is designed specifically for monitoring abnormal

temperatures to prevent excessive temperature increases and

to protect equipment. It comes in a slim housing with a width

of just 22.5 mm suitable for DIN-rail or direct panel mounting.

Settings are selected by DIP switches, making the K8AB-TH easy

to configure. The alarm threshold is set using rotary switches

on the front, allowing the alarm point to be easily checked at

a later time. The unit features multiple inputs with support for

both thermocouples and Pt100 sensors. For the alarm output,

a change-over relay is provided and, in contrast to many other,

comparable, monitoring relays, the K8AB-TH also embodies an

output latch function with (front button) latch reset, SV protection

and the choice of fail-safe/non-fail-safe relay operation.

Power indicator

Output latch reset button
(hold for SV protection)

Latch Reset (remote input)

Alarm Threshold (SV) setting switches

Alarm indicator

Alarm Output (change over relay)

Power supply

Sensor input

°C/°F marker

SW4 Temperature Unit (°C/°F)

SW5-SW8 Input type selector

SW3 Operation (Fail-safe/Non Fail-safe)

SW2 Output latch (On/Off)

SW1 Alarm mode (High/Low)

Easy to set up, field-configurable DIP switch
for multi-input and unit selection.

DIP switches

If a temperature sensor is damaged or the SSR

is short circuited in a furnace, the controller has

no means of stopping rises in temperature.

An internal alarm can help, but there is still some

risk if the controller fails. This risk is eliminated

by the built-in redundancy of the K8AB-TH alarm

unit which can automatically switch off the power

to the furnace.

Temperature rises due to heat dissipation from

SSRs within a cabinet can be too high for efficient

operation. Simple ON/OFF control with the

K8AB-TH can protect against overheating without

the necessity and expense of running the fans

continuously.

LEA_K8AB-TH_01_EN_INT

Although we strive for perfection, Omron Europe

BV and/or its subsidiary and affiliated companies do

not warrant or make any representations regarding

the correctness or completeness of the information

described in this document. We reserve the right to

make any changes at any time without prior notice.

Power supply

Alarm setting

Input (current temperature)

Alarm (red) indicator

Non-fail safe,
Alarm (relay) output

Fail safe,
Alarm (relay) output

Power supply

Alarm setting

Input (current temperature)

Alarm (red) indicator
Latch reset (see note)
Non-fail safe,

Alarm (relay) output
Fail safe,

Alarm (relay) output

Note: The output latch is reset using the reset button on the front or the external input terminal.

Hysteresis 2°C

Hysteresis 2°C

Output Latch Enabled

Output Latch Disabled

Output latch function with (front button) latch reset,
SV protection and the choice of fail-safe/non-fail-safe relay operation.

Benefits of K8AB-TH
temperature-monitoring relay:

• Flexibility: simple and intelligent

features for temperature alarm.

• Easy to set up, field-configurable DIP

switch for multi-input and unit selection.

• Space-saving design, compact and slim

(22.5 mm wide) DIN-rail & direct panel

mounting.

• Only 4 application-specific models,

high- and low-temperature range,

24 V or 100-240 V.

• Change-over type output relay, with or

without latching and front button reset.

• Self protecting against power or unit

failure thanks to selectable relay

fail-safe mode.

• Clear status indication;

one LED for power and SV protection,

one LED for alarm and unit condition.

For control

Temperature guard non latching

Temperature ‘policeman’ latching

K8AB-TH models

Model Supply voltage Setting accuracy Temperature setting range Input type

K8AB-TH11S 100 to 240 VAC

1°C/°F 0 to 399°C/°F Thermocouple (K, J, T, E) / PT100

K8AB-TH11S 24 VAC/VDC

K8AB-TH12S 100 to 240 VAC

10°C/°F 0 to 1700°C/0 to 3200°F Thermocouple (K, J, T, E, B, R, S, PLII)

K8AB-TH12S 24 VAC/VDC

OMRON EUROPE B.V.

Wegalaan 67-69, NL-2132 JD, Hoofddorp, The Netherlands. Tel: [phone] Fax: [phone] www.omron-industrial.com

Austria

Tel: [phone]
www.omron.at

Belgium

Tel: [phone]
www.omron.be

Czech Republic

Tel: [phone]
www.omron.cz

Denmark

Tel: [phone]
www.omron.dk

Finland

Tel: [phone]
www.omron.fi

France

Tel: [phone]

www.omron.fr

Germany

Tel: [phone]
www.omron.de

Hungary

Tel: [phone]
www.omron.hu

Italy

Tel: [phone]
www.omron.it

Middle East & Africa

Tel: [phone]
www.omron-industrial.com

Netherlands

Tel: [phone]
www.omron.nl

Norway

Tel: [phone]
www.omron.no

Poland

Tel: [phone]
www.omron.pl

Portugal

Tel: [phone]
www.omron.pt

Russia

Tel: [phone]
www.omron.ru

Spain

Tel: [phone]
www.omron.es

Sweden

Tel: [phone]
www.omron.se

Switzerland

Tel: [phone]
www.omron.ch

Turkey

Tel: [phone]

www.omron.com.tr

United Kingdom

Tel: [phone]
www.omron.co.uk