Omron K3HB-HTA-DRT1 Temperature Panel Meter: Digital Indicator with DeviceNet Communication

Product Overview

The Omron K3HB-HTA-DRT1 is a compact 1/32 DIN digital temperature indicator designed for accurate measurement and display of temperature values in industrial automation applications. This panel meter accepts both thermocouple and platinum resistance thermometer inputs, making it suitable for a wide range of temperature monitoring tasks across manufacturing processes. The device features a 5-digit negative LCD display with backlit LED illumination, offering excellent visibility even in low-light industrial environments. The display characters are 14.2 mm high for the process value and 4.9 mm for the set value, with the ability to switch between green and red color modes for enhanced operator awareness. The K3HB-HTA-DRT1 integrates DeviceNet communication capabilities, enabling direct connection to PLC systems for remote monitoring and data collection.

Key Features of Omron K3HB-HTA-DRT1

This temperature indicator supports both platinum resistance thermometer inputs and thermocouple inputs across multiple types including K, T, N, B, R, S, U, L, and W. The measurement accuracy for platinum resistance thermometers is ±0.2% of the process value or ±0.8 °C, whichever is larger, while thermocouple accuracy is ±0.3% of the process value or ±1 °C, whichever is larger. The device provides a sampling period of 50 times per second, equivalent to 20 milliseconds, ensuring timely updates of displayed temperature values. Comparative output response time is 120 milliseconds maximum for platinum resistance thermometer inputs and 180 milliseconds maximum for thermocouple inputs, allowing for rapid alarm and control actions based on temperature deviations.

The K3HB-HTA-DRT1 includes five event inputs that accept no-voltage contact or NPN open collector signals, providing flexible integration with external sensors and control switches. The DeviceNet output interface supports transfer output of temperature measurements directly to the PLC network, eliminating the need for additional analog conversion hardware. The meter features built-in memory protection using EEPROM non-volatile memory with a rating of 100,000 rewrites, ensuring that configuration parameters and settings are retained during power interruptions.

Technical Specifications

• Manufacturer: Omron Corporation

• Part Number: K3HB-HTA-DRT1

• Product Type: Temperature Panel Meter / Digital Indicator

• Input Types: Thermocouple, Platinum Resistance Thermometer

• Display: Negative LCD with backlit LED, 5-digit, 14.2 mm PV character height

• Sampling Period: 50 times / second (20 ms)

• Comparative Output Response: 120 ms max (RTD), 180 ms max (thermocouple)

• Event Inputs: 5 points, no-voltage contact / NPN open collector

• Output Type: DeviceNet communication

• Power Supply: 24 VDC / 24 VAC 50/60 Hz

• Power Consumption: 7 W max (DC) / 11 VA max (AC)

• Dielectric Strength: 2,300 VAC for 1 minute

• Protection Rating: NEMA4X for indoor use (front panel)

• Operating Temperature: -10 to +55 °C

• Degree of Protection: Front: IP66, Case rear: IP20

Functional Description

The K3HB-HTA-DRT1 continuously samples the connected temperature sensor, converts the analog signal to a digital value, and displays the result on the front panel display. The device supports multiple thermocouple types and RTD ranges, configurable through either front panel buttons or DeviceNet communication. The five event inputs can be used for functions such as hold, reset, peak memory, valley memory, or as external triggers for comparative output evaluation. When the measured temperature exceeds or falls below user-defined thresholds, the DeviceNet output transmits the appropriate status flags to the PLC, allowing the control system to initiate corrective actions such as turning on heaters, activating cooling fans, or generating operator alarms.

Applications

The Omron K3HB-HTA-DRT1 temperature panel meter is deployed in industrial processes where accurate temperature monitoring and PLC integration are required. Typical applications include plastic injection molding machines, heat treatment furnaces, food processing equipment, HVAC systems, and laboratory test stands. The compact 1/32 DIN size allows the meter to be mounted in dense control panels where space is limited, while the DeviceNet connectivity enables central monitoring of multiple temperature points from a single PLC station.