Product Description
Overview: The Isolated Interface for Intrinsic Safety
The ABB HAC807B102 is a specialized analog input termination unit designed for use with intrinsically safe (IS) field devices in hazardous areas. This module acts as the critical interface between sensitive measurement instruments in explosive atmospheres and the safe-area control system. It provides both signal conditioning and the essential energy limitation required by IS standards. Therefore, it enables the safe and reliable integration of temperature transmitters, pressure sensors, and other IS equipment into the Advant or 800xA DCS.
Functional Highlights: Channel Isolation and Precision Limiting
A defining feature of this unit is its channel-wise electrical isolation, which prevents fault propagation and ensures signal integrity in noisy industrial environments. Moreover, it incorporates precise electronic current limiting (≤ 28.5 mA) to guarantee the connected field circuit cannot generate a spark with enough energy to cause ignition. In addition, the module offers a fast measurement update time of less than 40ms, providing the control system with near-real-time data for responsive process control. Consequently, you achieve a combination of safety, accuracy, and speed that is mandatory for critical process measurements in plants.
Technical Data & Specifications
Here are the core technical specifications for this intrinsic safety barrier:
Manufacturer & Model: ABB HAC807B102
Ordering Number: 3BHE039221R0102
Module Type: Analog Input Termination Unit (Intrinsically Safe)
Application System: ABB Advant OCS / 800xA DCS
Update Time: < 40 milliseconds
Isolation: Channel-to-channel and channel-to-system
Output Voltage (Ui): 250 V eff (per EN 50020)
Maximum Output Current (Ii): Limited to ≤ 28.5 mA
Output Power (Pi): 600 mW maximum
No-Load Voltage: Limited to 21 V
Dimensions (H x W x D): 23 x 80 x 90 mm
Weight: 0.06 kg
Origin: Sweden
Condition: Brand New, Active Product
Typical Applications & System Integration
This unit is essential in industries like oil & gas, chemical processing, pharmaceuticals, and paint manufacturing where hazardous (flammable) atmospheres exist. For instance, it is used to connect thermocouples in a refinery distillation column or pressure transmitters in a solvent storage area. Furthermore, it mounts on a DIN rail within the safe-area control cabinet, connecting on one side to the DCS I/O card and on the other to the field wiring going into the hazardous zone. Installation and certification must comply with local and international explosion protection standards (e.g., ATEX, IECEx).
FAQ
What does "intrinsically safe" mean for this module?
Intrinsic safety is a protection technique that ensures the electrical energy (voltage and current) available in the field wiring is limited to a level below what is needed to ignite a specific hazardous atmosphere. This module provides that limitation.
Can I use this module with any analog sensor?
No, you must use it with field devices (sensors, transmitters) that are themselves certified as intrinsically safe for the same hazardous area classification. The combination of the IS barrier (HAC807B102) and the IS field device forms the approved loop.
Does this module provide power to the field instrument?
It can provide the limited power required by two-wire (loop-powered) 4-20mA transmitters operating in an IS loop. The key point is that it restricts the maximum available power to a safe level.
What is the purpose of the channel-to-channel isolation?
This isolation prevents a fault (like a short to power) on one channel from affecting the signal on adjacent channels. It also helps eliminate ground loops and common-mode noise, improving overall measurement accuracy.
Is special engineering approval needed to install this unit?
Yes, the design and installation of intrinsically safe loops typically require documentation and approval by a competent person (e.g., an Ex Engineer) to ensure the entire loop—sensor, cable, barrier, and DCS—is compliant with the safety standards.
