Temperature Monitoring Relay
K8AK-TH
Compact and Slim Relay Ideal for
Temperature Alarms and Monitoring
• Excessive temperature increases can be prevented and
abnormal temperatures can be monitored.
• Temperature monitoring in slim design with a width of just
22.5 mm.
• Rotary switches simplifies temperature settings.
• Universal-input support for thermocouple or platinum
resistance thermometer sensor input.
• Change the output relay between normally open and
normally closed operation.
• Alarm status identification with LED indicator.
• Self-holding output.
• Alarm output status can be retained even if the power
supply is turned OFF.
Refer to
Safety Precautions
on page 8.
For the most recent information on models that have been certified for
safety standards, refer to your OMRON website.
Ordering Information
K8AK-TH (Temperature Input Models)
Power supply
voltage
Type
Output relays
Input types
Setting units (setting range)
Model
100 to 240 VAC Temperature 1 relay
input
24 VAC/DC
Thermocouple or platinum Setting unit: 1°C or 1°F (0 to 999°C/°F) K8AK-TH11S 100-240VAC
resistance thermometer
Thermocouple
Setting unit: 10°C/°F*
K8AK-TH12S 100-240VAC
Thermocouple or platinum Setting unit: 1°C or 1°F (0 to 999°C/°F) K8AK-TH11S 24VAC/DC
resistance thermometer
Thermocouple
Setting unit: 10°C/°F*
K8AK-TH12S 24VAC/DC
* Refer to
Setting Ranges
on page 3 for the setting ranges.
Note:
When ordering, designate the power supply specification. Different Relay models are used for 100 to 240 VAC and 24 VAC/VDC.
1
K8AK-TH
Specifications
Ratings
Item
Allowable voltage range
Power consumption
Sensor inputs
Output relay
External inputs
(for latch setting)
Contact input
Non-contact input
K8AK-TH11S
K8AK-TH12S
Power supply voltage
5 VA max.
Thermocouple: K, J, T, E, B, R, S, PLII
One SPDT relay (5 A at 250 VAC, resistive load)
ON: 1 kΩ max., OFF: 100 kΩ min.
ON residual voltage: 1.5 V max., OFF leakage current: 0.1 mA max.
Leakage current: Approx. 10 mA
Setting method
Indicators
Other functions
Ambient operating temperature
Ambient operating humidity
Storage temperature
Rotary switch setting (set of three switches)
Power (PWR): Green LED, Relay output (ALM): Red LED
Alarm Mode (upper limit/lower limit), non-fail safe/fail safe selection, output latch, setting protection, temperature
unit
°C/°F
−20
to 55°C (with no condensation or icing)
Relative humidity: 25% to 85%
−25
to 65°C (with no condensation or icing)
100 to 240 VAC 50/60 Hz
85% to 110% of power supply voltage
2 W max. (24 VDC), 4 VA max. (24 VAC)
Thermocouple: K, J, T, E; Platinum-resistance thermometer: Pt100, Pt1000
24 VAC 50/60 Hz or 24 VDC
Characteristics
Measurement accuracy
hysteresis width
Output relay
K8AK-TH11S:
±1%
of the setting range or
±4°C,
whichever is larger
K8AK-TH12S:
±1%
of the setting range (±1% FS)
2°C
Rated load
Resistive load
5 A at 250 VAC
5 A at 30 VDC
Maximum switching capacity: 1,250 VA, 150 W
Minimum load: 5 VDC, 10 mA (reference values)
Mechanical life: 10 million operations min.
Electrical life: 5 A at 250 VAC or 30 VDC: 50,000 operations
3 A at 250 VAC/30 VDC: 100,000 operations
100 ms
20 MΩ (at 500 V) between charged terminals and exposed uncharged parts
20 MΩ (at 500 V) between any charged terminals (i.e., between input, output, and power supply terminals)
20 MΩ (at 500 V) between contacts (open)
2,300 VAC, 50/60 Hz for 1 min between terminals of different charge
Frequency: 10 to 55 Hz, 0.35-mm single amplitude
10 sweeps of 5 min each in X,Y, and Z directions
100 m/s
2
, 3 times each in 6 directions along 3 axes
Approx. 160 g
IP20
Non-volatile memory (number of writes: 1 million)
UL 61010-1
Installation environment (pollution level 2, installation category II)
EN 61326-1 Industrial electromagnetic environment
UL 61010-1 (Recognition), Korean Radio Waves Act (Act 10564), CSA: C22.2 No.14
0.49 to 0.59 N·m
Two solid wires of 2.5 mm
2
or two ferrules of 1.5 mm
2
with insulation sleeves can be tightened together.
N1.5
PC and ABS, UL 94 V-0
Mounts to DIN Track.
22.5
×
100
×
90 mm (W
×
D
×
H)
Sampling cycle
Insulation resistance
Dielectric strength
Vibration resistance
Shock resistance
Weight
Degree of protection
Memory protection
Safety
Standards
Approved standards
EMC
Application standards
Terminal screw tightening torque
Crimp terminals
Case color
Case material
Mounting
Dimensions
2
K8AK-TH
Setting Ranges
●K8AK-TH11S
Centigrade
Input
Setting tempera-
ture range
1,000
800
600
400
200
0
K
999
J
850
T
400
E
600
Pt100
850
Pt1000
850
0
0
0
0
0
0
Minimum setting increment
1°C
Fahrenheit
Input
Setting temperature
range
1,000
800
600
400
200
0
K
999
J
999
T
700
E
999
Pt100
999
Pt1000
999
Å@
Å@
Å@
Å@
Å@
0
0
0
0
0
0
Minimum setting increment
1°F
●K8AK-TH12S
Centigrade
Input
1,800
1,700
1,600
1,500
1,400
1,300
1,200
1,100
1,000
900
800
700
600
500
400
300
200
100
0
K
J
T
E
B
1,800
R
1,700
S
1,700
PLII
1,300
1,300
Setting temperature
range
850
600
400
100
0
0
0
0
0
0
0
Minimum setting increment
10°C
Fahrenheit
Input
3,200
3,100
3,000
2,900
2,800
2,700
2,600
2,500
2,400
2,300
2,200
2,100
2,000
1,900
1,800
1,700
1,600
1,500
1,400
1,300
1,200
1,100
1,000
900
800
700
600
500
400
300
200
100
0
K
J
T
E
B
3,200
R
3,000
S
3,000
PLII
2,300
2,300
Setting temperature
range
1,500
1,100
700
300
0
0
0
0
0
0
0
Minimum setting increment
10°F
●Temperature
Input Range
TH11S
Input
type
K
J
T
E
Pt100
Pt1000
---
---
°C
Lower
limit
−20
−20
−20
−20
−20
−20
---
---
Upper
limit
1019
870
420
620
870
870
---
---
Lower
limit
−40
−40
−40
−40
−40
−40
---
---
°F
Upper
limit
1039
1039
740
1039
1039
1039
---
---
TH12S
Input
type
K
J
T
E
B
R
S
PLII
°C
Lower
limit
−20
−20
−20
−20
0
−20
−20
−20
Upper
limit
1320
870
420
620
1820
1720
1720
1320
Lower
limit
−40
−40
−40
−40
0
−40
−40
−40
°F
Upper
limit
2340
1540
740
1140
3240
3040
3040
2340
3
K8AK-TH
Connections
Wiring Diagrams
K8AK-TH11S
Power supply
voltage*
1
K8AK-TH12S
Power supply
voltage*
1
Not used.
Power supply
Relay output
Not used.
Power supply
Relay output
A1
A2
A1
A2
14 11 12
14 11 12
*1 The input power supply depends on the
model: 100 to 240 VAC or 24 VAC/VDC (no
polarity)
External input
(LATCH_RST)
*
2
4
1
5
2
6
3
Not used.
External input
(LATCH_RST)
*
2
*2
4
1
+
5
2
−
6
3
Not used.
Not used.
Wiring of the external input terminals is as shown
below.
Sensor input
Sensor input
+
Thermocouple
B
−
B A
Pt resistance thermometer input
Thermocouple
Timing Charts
Temperature Alarm: Hysteresis: 2°C/°F
Temperature setting
Temperature alarm upper limit (11) to (14)
Temperature alarm lower limit (11) to (14)
Changing between Normally Open and Normally Closed
Power supply
Temperature alarm or other error
With relay outputs (11) to (14) normally open
With relay outputs (11) to (14) normally closed
* Other errors: sensor open circuit error, sensor input error, temperature setting
error, and memory error.
2°C (°F)
2°C (°F)
Latched Operation: Relay outputs remain latched even after the alarm
or error is reset.
Power supply
Temperature alarm or other error
LATCH_RST or external inputs (4) to (5)
Relay output (latched) (11) to (14)
0.02 s
* If LATCH_RST is enabled, the alarm status is retained even if the power supply is
cycled.
To clear the alarm status, press the LATCH_RST button or turn ON the external input.
(Default: Latching enabled.)
Operation of Indicators
Power supply
SV Protect Mode
Flashing
PWR indicator
Power supply
Temperature alarm
Other error
ALM indicator
Flashing
4
K8AK-TH
Nomenclature
Front Operations
●Error
(ALM indicator: Flashing)
Power supply
Relay output
R_SW3
Temperature
unit
(Black
out the
unnecessary
label: °C or °F)
PWR Indicator (Green)
R_SW2
ALM indicator (Red)
R_SW1
LATCH_RST
button*
External input
(LATCH_RST)
Sensor input
One of the following items 1 to 3 has occurred.
1. The sensor circuit is disconnected or the
temperature setting is out of the specified range.
2. The temperature setting is out of the specified range.
3. There is a problem in the internal circuits.
Corrections
1. Disable SV Protect Mode.
2. Disable the latch.
3. Check for incorrect wiring, circuit disconnections,
short circuits, and whether the input type and
temperature settings are correct.
4. If the wiring and settings are correct, reset the power
supply.
If the Unit resumes normal operation, the problem
may have been caused by noise.
If the Unit does not resume normal operation, it must
be replaced.
* The non-volatile memory stores the event when a latched output is
disabled, or the SV Protect Mode is enabled or disabled. An error
may occur if the data is updated more than one million times.
* If you press and hold the LATCH_RST button for 5 seconds or
longer, the SV Protect Mode will go into effect.
When SV Protect Mode is enabled, the PWR indicator flashes.
To disable the SV Protect Mode, press and hold the LATCH_RST
Button for at least 5 seconds.
●Alarm
Setting Rotary Switch
Point the arrow to the required number.
Note: 1.
Use solid-core wires of 2.5-mm
2
max. or ferrules with an
insulation sleeve to wire to this terminal.
To ensure the dielectric strength of the connection, do not
expose more than 8 mm of wire for insertion into the
terminal.
For a solid
wire
of 2.5-mm
2
of max.
For ferrules
with
an insulation sleeve.
8
mm max.
8
mm max.
Recommended Ferrules
Phoenix Contact
Al 1.5-8BK (for AWG16)
•Al 1-8RD (for AWG18)
•Al 0,75-8GY (for AWG18)
2.
Screw tightening torque: 0.49 to 0.59 N·m
3.
The terminal screw is a Pozidriv screw.
5
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