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. 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 Type Output relays Input types Setting units (setting range) Model voltage 100 to 240 VAC Temperature 1 relay Thermocouple or platinum Setting unit: 1C or 1F (0 to 999C/F) K8AK-TH11S 100-240VAC input resistance thermometer Thermocouple Setting unit: 10C/F* K8AK-TH12S 100-240VAC 24 VAC/DC Thermocouple or platinum Setting unit: 1C or 1F (0 to 999C/F) K8AK-TH11S 24VAC/DC resistance thermometer Thermocouple Setting unit: 10C/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. 1K8AK-TH Specifications Ratings Item 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 Contact input ON: 1 k max., OFF: 100 k min. (for latch setting) 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 55C (with no condensation or icing) Ambient operating humidity Relative humidity: 25% to 85% Storage temperature 25 to 65C (with no condensation or icing) Characteristics Measurement accuracy K8AK-TH11S: 1% of the setting range or 4C, whichever is larger K8AK-TH12S: 1% of the setting range (1% FS) hysteresis width 2C 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 M (at 500 V) between charged terminals and exposed uncharged parts 20 M (at 500 V) between any charged terminals (i.e., between input, output, and power supply terminals) 20 M (at 500 V) between contacts (open) Dielectric strength 2,300 VAC, 50/60 Hz for 1 min between terminals of different charge 2 Vibration resistance Vibration of 10 to 55 Hz and acceleration of 50 m/s for 5 min with 10 sweeps each in X, Y, and Z directions 2 Shock resistance 100 m/s , 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 Approved standards UL 61010-1 Standards Installation environment (pollution level 2, installation category II) EMC EN 61326-1 Application standards UL 61010-1, Korean Radio Waves Act (Act 10564), CSA: C22.2 No.14, CCC: GB14048.5 Terminal screw tightening torque 0.49 to 0.59 Nm 2 2 Crimp terminals Two solid wires of 2.5 mm or two ferrules of 1.5 mm 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) 2