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K8AK-TH

Temperature Monitoring Relay

K8AK-TH

Compact and Slim Relay Ideal for Temperature Alarms and Monitoring

Ratings

Power supply voltage 100 to 240 VAC 50/60 Hz 24 VAC 50/60 Hz or 24 VDC
Allowable voltage range 85% to 110% of power supply voltage
Power consumption 5 VA max. 2 W max. (24 VDC), 4 VA max. (24 VAC)
Sensor inputs K8AK-TH11S Thermocouple: K, J, T, E; Platinum-resistance thermometer: Pt100, Pt1000
K8AK-TH12S Thermocouple: K, J, T, E, B, R, S, PLII
Output relay One SPDT relay (5 A at 250 VAC, resistive load)
External inputs
(for latch
setting)
Contact input ON: 1 kΩ max., OFF: 100 kΩ min.
Non-contact input ON residual voltage: 1.5 V max., OFF leakage current: 0.1 mA max.
Leakage current: Approx. 10 mA
Setting method Rotary switch setting (set of three switches)
Indicators Power (PWR): Green LED, Relay output (ALM): Red LED
Other functions Alarm Mode (upper limit/lower limit), non-fail safe/fail safe selection, output
latch, setting protection, temperature unit °C/°F
Ambient operating temperature -20 to 55°C (with no condensation or icing)
Ambient operating humidity Relative humidity: 25% to 85%
Storage temperature -25 to 65°C (with no condensation or icing)

Characteristics

Measurement accuracy K8AK-TH11S: ±1% of the setting range or ±4°C, whichever is larger
K8AK-TH12S: ±1% of the setting range (±1% FS)
hysteresis width 2°C
Output relay 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
Sampling cycle 100 ms
Insulation resistance 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)
Dielectric strength 2,300 VAC, 50/60 Hz for 1 min between terminals of different charge
Vibration resistance Frequency: 10 to 55 Hz, 0.35-mm single amplitude
10 sweeps of 5 min each in X,Y, and Z directions
Shock resistance 100 m/s2, 3 times each in 6 directions along 3 axes
Weight Approx. 160 g
Degree of protection IP20
Memory protection Non-volatile memory (number of writes: 1 million)
Safety
Standards
Approved
standards
UL 61010-1
Installation environment (pollution level 2, installation category II)
EMC EN 61326-1 Industrial electromagnetic environment
Application
standards
UL 61010-1 (Recognition), Korean Radio Waves Act (Act 10564), CSA: C22.2 No.14, CCC: GB14048.5
Terminal screw
tightening torque
0.49 to 0.59 N·m
Crimp terminals Two solid wires of 2.5 mm2 or two ferrules of 1.5 mm2 with insulation sleeves can be
tightened together.
Case color N1.5
Case material PC and ABS, UL 94 V-0
Mounting Mounts to DIN Track.
Dimensions 22.5 × 100 × 90 mm (W × D × H)

Setting Ranges

K8AK-TH11S

Centigrade

K8AK-TH Specifications 5

Fahrenheit

K8AK-TH Specifications 6

K8AK-TH12S

Centigrade

K8AK-TH Specifications 8

Fahrenheit

K8AK-TH Specifications 9

Temperature Input Range

TH11S °C °F
Input type Lower limit Upper limit Lower limit Upper limit
K -20 1019 -40 1039
J -20 870 -40 1039
T -20 420 -40 740
E -20 620 -40 1039
Pt100 -20 870 -40 1039
Pt1000 -20 870 -40 1039

TH12S °C °F
Input type Lower limit Upper limit Lower limit Upper limit
K -20 1320 -40 2340
J -20 870 -40 1540
T -20 420 -40 740
E -20 620 -40 1140
B 0 1820 0 3240
R -20 1720 -40 3040
S -20 1720 -40 3040
PLII -20 1320 -40 2340