Description
Core Product Summary (Brand / Model / Key Attributes)
Honeywell FC-TSGAS-1624 is a conformal-coated, 16-channel field termination assembly (FTA) for gas and flame detector input signals in a Honeywell Safety Manager system. It converts 0–20 mA DC field signals into the 0–4 VDC input range required by the SAI-1620M high-density Safety Analog Input module.
Each channel provides a common 0 V reference, a 500 ohm ±5% input resistance, and a 0.1% conversion accuracy. The FTA distributes external 24 VDC power to transmitters through 500 mA fused channels and monitors the external power connected to the module. It uses screw terminals, mounts on a TS32 or TS35 × 7.5 DIN rail, and is documented with CE, TÜV, UL, CSA, and FM approvals.
Key Technical Specifications
| Specification | Value |
|---|---|
| Manufacturer | Honeywell |
| Model | FC-TSGAS-1624 |
| Product type | Safe gas / flame detector input field termination assembly |
| System family | Honeywell Safety Manager |
| Compatible I/O module | SAI-1620M high-density Safety Analog Input module |
| Input channels | 16, with common 0 V |
| Field input range | 0–20 mA DC |
| Input current range | 0–25 mA |
| Input resistance | 500 ohms ±5% |
| Output to SAI-1620M | 0–4 VDC |
| Conversion accuracy | 0.1% |
| External power requirement | 24 VDC, 3 mA without field loads |
| Transmitter power distribution | 500 mA fused per channel |
| Fuse rating | 500 mA, Schurter 0001.2501 |
| Fuse voltage rating | 250 VAC / 300 VDC |
| External-power monitoring | Provided |
| Termination type | Screw terminals |
| Maximum field wire size | 2.5 mm² (AWG 14) |
| Field-wire strip length | 7 mm (0.28 in) |
| Field-wire tightening torque | 0.5 Nm (0.37 ft-lb) |
| Power-terminal wire size | Up to 16 mm² (AWG 8) |
| Power-terminal strip length | 7 mm (0.28 in) |
| Power-terminal tightening torque | 1.2 Nm (0.88 ft-lb) |
| Dimensions | 225 × 70 × 60 mm (L × W × H) |
| DIN-rail compatibility | TS32 or TS35 × 7.5 |
| Rail length used | 226 mm |
| Coating | Conformal coated |
| Approvals | CE, TÜV, UL, CSA, FM |
Detailed Product Overview
The Honeywell FC-TSGAS-1624 is a field termination assembly that interfaces approved gas and flame detectors with the SAI-1620M Safety Analog Input module. It accepts 0–20 mA DC field signals and converts them linearly to the 0–4 VDC signal level required by the SAI-1620M module, allowing the Safety Manager system to process detector current signals through its analog-input architecture.
The FTA provides 16 input channels with a common 0 V reference. Each channel presents a 500 ohm ±5% input resistance and converts the incoming current signal with a documented accuracy of 0.1%. The module accepts input currents up to 25 mA, providing measurement range beyond the nominal 20 mA field-signal span.
Power for field transmitters is distributed from an external 24 VDC supply. Each transmitter channel is protected by a 500 mA fuse, and the FTA monitors the external power connected to the module. The FTA itself requires only 3 mA from the 24 VDC supply when no field loads are connected; the actual supply sizing must include the connected transmitters and their loop requirements.
Field wiring is terminated on screw terminals. Each of the 16 channels uses a group of four screw terminals, and a ground terminal is provided per channel for screening analog input cables. The FTA mounts on a TS32 or TS35 × 7.5 DIN rail and uses 226 mm of rail length. Its conformal-coated construction distinguishes the FC-TSGAS-1624 from the non-coated FS-TSGAS-1624 variant.
Engineering Selection Highlights
- The FC-TSGAS-1624 is selected when 0–20 mA gas or flame detector signals must be interfaced to a Honeywell SAI-1620M Safety Analog Input module.
- Its 500 ohm input resistance converts field current into a 0–4 VDC signal, so loop-voltage calculations must include this resistance and the transmitter’s compliance voltage.
- Each channel is fused at 500 mA, allowing transmitter power distribution while limiting the effect of a faulted channel.
- The FTA monitors external 24 VDC power, supporting detection of a loss or abnormal condition in the transmitter supply.
- Its 16 channels share a common 0 V reference, so grounding, shielding, and channel grouping must preserve signal integrity.
- The 225 × 70 × 60 mm housing requires 226 mm of TS32 or TS35 × 7.5 DIN-rail length.
- The conformal-coated FC version should be selected where the installed Safety Manager specification calls for coated field hardware.
FC-TSGAS-1624
FC-TSGAS-1624
Dimensions, Mounting & Connection Notes
| Item | Verified data |
|---|---|
| Dimensions | 225 mm long × 70 mm wide × 60 mm high |
| DIN-rail compatibility | TS32 or TS35 × 7.5 |
| Rail length used | 226 mm |
| Termination type | Screw terminals |
| Field-wire size | Up to 2.5 mm² (AWG 14) |
| Field-wire strip length | 7 mm (0.28 in) |
| Field-wire tightening torque | 0.5 Nm (0.37 ft-lb) |
| Power-terminal wire size | Up to 16 mm² (AWG 8) |
| Power-terminal strip length | 7 mm (0.28 in) |
| Power-terminal tightening torque | 1.2 Nm (0.88 ft-lb) |
| Channel construction | Sixteen groups of four screw terminals |
| Cable screening | One ground terminal per channel |
| Fuse | 500 mA Schurter 0001.2501 per transmitter channel |
System Compatibility & Integration Requirements
| Item / Dependency | Verified Compatibility or Requirement | Practical Note |
|---|---|---|
| Safety system | Honeywell Safety Manager | The FC-TSGAS-1624 is a Safety Manager field termination assembly. |
| I/O module | SAI-1620M high-density Safety Analog Input module | The FTA converts 0–20 mA field signals to the SAI-1620M input range. |
| Field signal | 0–20 mA DC gas or flame detector signals | Input current up to 25 mA is accepted. |
| Signal conversion | 0–20 mA input converted to 0–4 VDC output | The conversion accuracy is documented as 0.1%. |
| Transmitter power | External 24 VDC supply | Each transmitter channel is fused at 500 mA. |
| System cable | FS-SIC-0001 field cable | Safety Manager documentation identifies this standard cable for connecting FTAs to I/O modules. |
| Mounting rail | TS32 or TS35 × 7.5 DIN rail | The assembly uses 226 mm of rail length. |
| Coating variant | FC-TSGAS-1624 is conformal coated; FS-TSGAS-1624 is non-coated | Confirm the required coating variant during procurement. |
FAQ
What is the Honeywell FC-TSGAS-1624?
It is a Honeywell Safety Manager 16-channel field termination assembly for gas and flame detector input signals.
Which I/O module does the FC-TSGAS-1624 connect to?
It interfaces gas and flame detector signals with the Honeywell SAI-1620M high-density Safety Analog Input module.
What field signal does it accept?
It accepts 0–20 mA DC field signals and can accept input current up to 25 mA.
What signal does it send to the SAI-1620M?
It converts the field current signal to a 0–4 VDC signal for the SAI-1620M module.
Does it provide transmitter power?
Yes. It distributes external 24 VDC power to transmitters, with each channel protected by a 500 mA fuse.
What are its dimensions and mounting requirements?
It measures 225 × 70 × 60 mm, mounts on a TS32 or TS35 × 7.5 DIN rail, and uses 226 mm of rail length.
What approvals are documented?
The FTA is documented with CE, TÜV, UL, CSA, and FM approvals.
Verification & Troubleshooting Notes
- Confirm the complete type designation, FC-TSGAS-1624, before matching the FTA to a Safety Manager I/O configuration or spare-parts record.
- Verify that each gas or flame detector is a 0–20 mA current-loop device and that its compliance voltage is sufficient for the loop, including the FTA’s 500 ohm input resistance.
- For a channel with no signal or an implausible reading, check the channel fuse, transmitter supply, loop continuity, and polarity before replacing the FTA or SAI-1620M module.
- Confirm that the external 24 VDC supply is present and correctly sized for the connected transmitters; the FTA itself draws 3 mA without field loads.
- Check the common 0 V reference, cable shields, and per-channel ground terminals when multiple channels show noise, offset, or unstable readings.
- Verify that screw-terminal torque and conductor sizes match the documented values during installation or maintenance.
- Use Safety Manager diagnostics and SAI-1620M channel readings to distinguish an FTA or field-wiring issue from an analog-input-module issue.
- Do not bypass channel fuses, external-power monitoring, shielding, or safety-related grounding during commissioning or troubleshooting.
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