Honeywell FC-TSGAS-1624 Safe 0-20 mA Analog Input Field Termination Assembly

The Honeywell FC-TSGAS-1624 is a Field Termination Assembly (FTA) designed to interface gas and flame detector signals with the SAI-1620m analog input module in Honeywell Safety Manager systems. It provides 16 analog input channels, linear signal conversion from field current to a 0-4 VDC module input level, and fused 24 VDC field power distribution. The assembly uses screw terminals and supports DIN rail mounting.

Technical Specifications

Signal Conversion and Field Interface

The FC-TSGAS-1624 accepts current signals from field transmitters and converts them into voltage signals for the SAI-1620m analog input module. The stated 0-4 VDC output range is the interface signal level presented to the receiving module; it should not be confused with the external 24 VDC supply used for field power distribution.

The 16 channels share a common 0 V reference. When planning detector connections, confirm that the field device output type, signal range, and grounding arrangement match the system wiring design.

Field Power Distribution and Protection

The assembly distributes externally supplied 24 VDC power to field transmitters, with a stated 500 mA fuse rating for each channel. The specified Schurter 5 x 20 mm cartridge fuse provides individual branch overcurrent protection. Fuse selection and replacement should follow the applicable assembly documentation, including the stated current derating at elevated temperatures.

The listed quiescent current of 3 mA applies without field loads. It does not represent the total supply current when transmitters are connected; the external supply must also accommodate the connected field devices and their operating current.

Installation and Wiring

The FC-TSGAS-1624 is designed for TS32 or TS35 x 7.5 DIN rail mounting, with a stated rail length requirement of 226 mm. Signal wiring and power wiring have different terminal capacities and tightening torques, so the applicable values should be followed separately during installation.

• Signal terminals: maximum 2.5 mm2 (AWG 14), 7 mm strip length, 0.5 Nm torque.
• Power terminals A and B: maximum 16 mm2 (AWG 8), 7 mm strip length, 1.2 Nm torque.

System Integration

The supplied technical information identifies the SAI-1620m analog input module and SICC-0001/Lx system cables as associated components. Verify the required cable variant, module configuration, and system wiring before ordering or replacing an existing assembly.

The source material also mentions redundant module configurations, but does not specify the redundancy architecture or configuration restrictions for this exact assembly. These details should be confirmed against the applicable Safety Manager system documentation.

Frequently Asked Questions

Q: How many field detector signals can the FC-TSGAS-1624 terminate?

A: It provides 16 analog input channels for field current signals. The number of detectors that can be connected depends on the channel allocation and the approved system configuration.

Q: What is the difference between the field input and the module output signal?

A: The assembly accepts 0(4)-20 mA DC field signals and provides a stated 0-4 VDC signal to the SAI-1620m. The two ranges describe different sides of the signal interface.

Q: What should be checked when replacing an existing FC-TSGAS-1624?

A: Confirm the complete model number, field wiring, fuse specifications, SAI-1620m interface, and required SICC-0001/Lx cable configuration. Also verify the terminal assignments and system configuration against the applicable documentation before energizing the replacement.