Honeywell TC-HAI081 Analog Input Module

High-Accuracy Analog Measurement for Critical Process Monitoring

The Honeywell TC-HAI081 analog input module delivers eight isolated channels for field signal acquisition. This module accepts standard 4-20 mA current loops and 1-5 VDC voltage signals. It accurately converts these analog signals into digital values for the controller. You can rely on this module for precise measurement of pressure, temperature, and flow. Its design ensures stable operation in harsh industrial environments.

Input Configurations and Signal Conditioning

Each channel offers independent configuration for current or voltage inputs. The module provides a built-in 24 VDC loop power supply for each channel. This supply eliminates the need for external power sources for transmitters. The module also includes programmable input filtering for noise rejection. This filtering enhances measurement stability in electrically noisy areas. Furthermore, the module features high input impedance for minimal signal loading.

Key Technical Specifications

Parameter	Specification
Manufacturer	Honeywell Process Solutions
Model	TC-HAI081
Product Type	Analog Input Module
Number of Channels	8 (Isolated)
Input Types	4-20 mA, 0-20 mA, 1-5 VDC, 0-10 VDC
Input Impedance	250 Ω (Current Mode); > 1 MΩ (Voltage Mode)
Loop Power Supply	24 VDC @ 25 mA (Per Channel)
Resolution	16-bit
Accuracy	±0.05% of Span (Typical)
Temperature Drift	±0.005% / °C
Common Mode Rejection	> 100 dB at 50/60 Hz
Series Mode Rejection	> 60 dB at 50/60 Hz
Update Rate	25 ms per Channel (Typical)
Isolation Voltage	1500 VAC (Channel to Backplane)
Power Consumption	5 VDC: < 300 mA; 24 VDC: < 150 mA
LED Indicators	Channel Active, Fault Status
Dimensions	28.5 cm x 17.8 cm x 5.5 cm (H x W x D)
Weight	Approximately 0.8 kg
Termination Assembly	Requires separate TA for field wiring
Operating Temperature	0°C to 60°C
Storage Temperature	-40°C to 85°C
Relative Humidity	5% to 95% (Non-condensing)

Data Conversion and Processing Capabilities

The module uses a 16-bit analog-to-digital converter for each input channel. This converter provides excellent resolution for small signal changes. The module also performs continuous self-calibration to maintain accuracy. This calibration compensates for temperature and aging effects automatically. Moreover, the module scales raw counts into engineering units directly. You can read values in psi, °C, or percent of span.

Integrated Loop Power and Energy Management

The TC-HAI081 supplies loop power to all eight connected transmitters simultaneously. This built-in power supply simplifies field wiring and reduces component count. The module limits current to protect against short circuits. It also includes reverse polarity protection for each channel. Additionally, the module consumes minimal power from the backplane. It dissipates less than 5 watts under maximum load.

Physical Dimensions and Interface Connections

This module measures 28.5 cm in height and 17.8 cm in width. Its depth is 5.5 cm for standard rack compatibility. The device weighs approximately 0.8 kilograms. It interfaces with field devices through a dedicated Termination Assembly. This assembly provides screw terminals for secure wiring connections. The front panel includes eight LED status indicators. These LEDs show channel activity and fault conditions clearly.

Installation, Configuration, and Application Suitability

You can install the TC-HAI081 into any TDC 3000 rack slot. Configuration involves selecting input type and range using software. The module then applies the correct scaling and filtering parameters. This module suits pressure monitoring in oil and gas applications. It also provides temperature inputs for chemical reactors. Furthermore, the module handles flow measurement from differential pressure transmitters.