Honeywell FC-TSGAS-1624 Field Termination Assembly

The Honeywell FC-TSGAS-1624 is a field termination assembly (FTA) for gas and flame detector signal connections in the Honeywell Safety Manager system. It provides 16 analog input channels for 0-20 mA signals and interfaces field detector wiring with the SAI-1620m high-density analog input module. Its termination circuitry supports signal conditioning and field power distribution.

Function and Signal Interface

The FC-TSGAS-1624 provides the connection point between field-mounted gas or flame detectors and the Safety Manager analog input system. Each input channel receives a detector current signal and converts it into a voltage signal for acquisition by the SAI-1620m module.

The 16 channels share a common 0 V reference. The assembly also provides fused power distribution to the connected transmitters, with individual channel protection specified in the hardware documentation.

Analog Input Conversion

Each channel uses a precision 500 ohm resistor to convert the detector current into a voltage signal for the SAI-1620m. The conversion range at the FTA output is 0-4 V DC, with a specified accuracy of 0.1%.

The assembly supports both active and passive transmitter wiring arrangements. Individual field cable shield terminals provide separate termination points for analog input cable screening.

Power Distribution and Protection

The FC-TSGAS-1624 uses an external 24 V DC supply connected through screw terminals A and B. It distributes power to the field transmitters through individual 500 mAT fused circuits. The external supply voltage can also be monitored by the Safety Manager through the SAI-1620m.

Parameter Specifications

Wiring and Installation Requirements

The assembly provides 16 groups of four screw terminals, numbered 1 to 64. Each channel has a dedicated field cable shield connection.

The manufacturer's hardware reference specifies the following termination requirements:

• Standard signal terminals: maximum wire size 2.5 mm2 (AWG 14).
• Signal terminal strip length: 7 mm.
• Signal terminal tightening torque: 0.5 Nm.
• Power terminals A and B: maximum wire size 16 mm2 (AWG 8).
• Power terminal strip length: 7 mm.
• Power terminal tightening torque: 1.2 Nm.

The external supply's 0 V connection is directly connected to the common 0 V reference of all 16 analog inputs. This relationship should be considered when checking field wiring and grounding arrangements.

Frequently Asked Questions

Q: Which analog input module is compatible with the FC-TSGAS-1624?

A: The specified companion module is the Honeywell SAI-1620m safe high-density analog input module. The FTA transfers its 16 input signals through the SICC-0001/Lx system interconnection cable.

Q: Does the FC-TSGAS-1624 support both active and passive gas detector connections?

A: Yes. The manufacturer's connection diagrams document both three-wire gas/flame detectors and two-wire 0(4)-20 mA transmitters. The appropriate wiring arrangement must match the field transmitter configuration.

Q: Does the FC-TSGAS-1624 provide individual channel protection?

A: Yes. Each transmitter power supply circuit has a 500 mAT fuse. The fuse rating is subject to temperature derating, reaching 0.35 A at a module ambient temperature of 70 deg C according to the manufacturer's specification.