Honeywell FS-TSAI-1620 Analog Input FTA

Precision Signal Conditioning for Safety Systems

The FS-TSAI-1620 serves as a high-density field termination assembly for the Honeywell Safety Manager platform. This module creates a robust physical interface between field sensors and the SAI-1620 analog input module. It supports both 0-20 mA and 4-20 mA current loop signals from critical process transducers. Therefore, it handles measurements like temperature, pressure, and flow for safety-related applications .

Technical Architecture and Channel Configuration

This assembly features sixteen individual analog input channels organized into two isolated groups of eight. Each group shares a common 0 V reference to simplify field wiring . The input circuit uses a high-precision 250 Ω resistor to convert the incoming current into a voltage signal. Consequently, the module delivers a 0-4 V DC output to the connected SAI-1620m module with an accuracy of ±0.1% . A 315 mA slow-acting fuse protects each group, ensuring reliable fault isolation without compromising the entire system .

Power Distribution and Hazardous Area Compliance

The FS-TSAI-1620 distributes limited power to passive transmitters through an external 30 V DC supply. Each channel provides an igniting current below 120 mA at 30 V DC with an output resistance of 270 Ω . This current-limiting design complies with Class I, Division 2 hazardous location standards. Moreover, the module supports redundant power inputs to ensure continuous operation during a supply failure . The assembly holds approvals from CE, TUV, UL, CSA, and FM, confirming its suitability for demanding industrial environments .

Physical Specifications and Installation

Parameter	Specification
Model	FS-TSAI-1620
Category	Analog Input Field Termination Assembly
Channels	16 (2 groups of 8)
Input Current	0-25 mA
Input Resistance	250 Ω (±1%)
Output Voltage	0-4 V DC
Accuracy	0.10%
External Power	30 V DC, 3 mA
Fuse Rating	315 mAT (5×20 mm)
Dimensions	210 x 70 x 60 mm
Weight	Approx. 0.43 kg
Mounting	DIN EN Rail (TS32 / TS35)
Terminals	Screw terminals, 2.5 mm² (AWG 14)
Compliance	CE, TUV, UL, CSA, FM

The module mounts easily on standard TS32 or TS35 DIN EN rails and occupies only 211 mm of rail space . Its compact form factor makes it ideal for space-constrained control cabinets. The screw terminals accept field conductors up to 2.5 mm² (AWG 14) with a strip length of 7 mm and a tightening torque of 0.5 Nm . This straightforward wiring scheme reduces installation time and minimizes potential connection errors.