Product Index :: Industrial Components :: Level/Monitoring Devices :: Heater Burnout Detectors

K8AC-H Digital Heater Element Burnout Detector

A high-precision Heater Element Burnout Detector Compatible with a Wide-range of Heater Control Methods

• Compatible with contactor, SSR, cyclic control, and phase control methods.

• Compatible with a wide range of heater capacities, from 0.200 to 200.0 A AC (range covered by 3 models).

• Voltage fluctuation compensation function enables accurate heater burnout detection, because power supply voltage fluctuations resulting in heater current fluctuation will not cause faulty outputs.

• Detects burnouts for even one heater when using multiple heaters.

• If the gate function is disabled, the gate input can be used as an undercurrent/ overcurrent relay or for motor or lamp loads (2 circuits).

• CE Marking.

• Contributes to preventative maintenance for heater burnout.

Note: Consult with your OMRON representative before using phase and cyclic control under the following conditions.

• Using multiple heaters with different heater capabilities

• Using heaters with varying heater resistance (e.g. halogen heaters)

Features

Compatible with Phase Control and Cyclic Control

The burnout alarm level shifts according to the control output from the Temperature Controller.

• Analog control is performed on the heater power according to the Temperature Controller's gate signal (4 to 20 mA) when phase control or cyclic control is used.

• Burnout detection is stable with the K8AC-H because the heater burnout alarm values shift according to the control output value from the Temperature Controller.

Compatible with Gradient Settings of Power Controllers

• When using a gradient setting with a power controller, set the gate current level that is suitable for the gradient setting.

Digital Measurement Achieves a Highly Precise Heater Burnout Alarm

Heater burnout is detected by digitally processing minor current fluctuations even when multiple heaters are connected in a circuit.

Detection of Heater Overcurrent and SSR Failure

Overcurrent can be detected from layer short circuits in addition to providing heater burnout alarms with overcurrent detection settings.

• SSR short circuit failures and SSR open circuit failures are detected by monitoring the heater current and the control outputs from the Temperature Controller.

• Detecting SSR failures enables promptly discovering that temperature control has failed.

RS-485 Communications

Measurement data, such as the present heater current, maximum/minimum heater current, and power supply voltage, can be read using RS-485 communications. The current when the heater burned out and the total operating time are recorded in memory, and this data can be used for preventative equipment maintenance. (This data can be checked on the main display.)

CE Marking

Compact Unit (35 × 90 × 100 mm (W × H × D))

New K8AC-H2 Functions

Point 1: New Screw-less Clamp Terminals

Work steps are reduced because there is no more need to manage screw torque or retighten screws.

Connect by simply inserting ferrules (sleeve terminals). No tools required.

Point 2: Scaling

Use the scaling function of the K8AC-H2[][][] to display the value of the primary current flowing to the heater by setting the parameters of the CT ratio and the number of CT passes.

Example of burnout detection of a single-phase heater rated at 240 A:
The maximum measurement range for the K8AC-H2[][][] is 200.0 A. Measurement
cannot be performed directly for a heater rated at 240 A, so the measurement signal is read by using an external CT.

Example: If a 300 A:1 A external CT is used, the secondary current value for an external CT will be 1 A, so select the K8AC-H21[][][] Heater Element Burnout Detector (current measurement range: 0.200 to 2.200 A).

Point 3: Global PNP-equivalent Output

The NPN open-collector output of the K8AC-H2[][]N Series uses a photocoupler for isolation from the internal circuits, so either an NPN open-collector output or a PNP-equivalent output can be used.

Point 4: Contributes to Preventive Maintenance

Measure the Run Time
Count the total run time in hours from the time the power supply is turned ON or the processing value is reset until an alarm occurs. Keeping a log of the run time until a burnout occurs helps to diagnose problems and maintain equipment.

Count the Total Number of Alarms Output
Set the upper and lower limits to count the total number of alarms that have been output.

RS-485 communications ability is provided as a standard feature for logging measurement data or analyzing data for preventive maintenance by using a PLC or other external device.

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See Related Products:

Heater Element Burnout Detector     K2CU Accurate detection of heater element burnout regardless of heater capacities.