Description
Honeywell FC-TSGAS-1624 | 0–20mA Safe Gas Detector FTA
Dynamic Product Introduction
The name can be misleading if you are sourcing this part from a generic automation inventory. FC-TSGAS-1624 is not the detector itself. It is the Safety Manager field termination hardware that takes the current signal from compatible gas/flame detector transmitters and conditions it for the associated SAI-1620m high-density safe analog input module.
Honeywell’s hardware reference places TSGAS-1624 in the Field Termination Assembly section and describes it specifically as a Safe Gas / Flame Detector Input FTA (0–20 mA, 16 channels). The signal path is therefore fundamentally different from a standard 24 VDC digital input FTA.
The important engineering detail is the conversion stage: the FC-TSGAS-1624 accepts 0–25 mA at its field input, presents a 500 Ω ±5% input resistance, and provides a 0–4 VDC output with 0.1% accuracy to the SAI-1620m module. Honeywell therefore designed this assembly around the signal requirements of its associated safety analog-input architecture rather than as a generic 4–20 mA terminal block.
FC-TSGAS-1624
Key Technical Specifications
- Manufacturer: Honeywell
- Model: FC-TSGAS-1624
- Product Type: Safe Gas / Flame Detector Input FTA
- System: Safety Manager
- Input Channels: 16
- Input Reference: Common 0 V
- Input Current Range: 0–25 mA
- Nominal Application: 0–20 mA gas/flame detector signals
- Input Resistance: 500 Ω ±5%
- External Supply: 24 VDC
- External Supply Current: 3 mA without field loads
- Output to SAI-1620m: 0–4 VDC
- Output Accuracy: 0.1%
- Fuse Rating: 500 mA
- Fuse Size: 5 × 20 mm
- Fuse AC Rating: 250 VAC
- Fuse DC Rating: 300 VDC
- Module Dimensions: 225 × 70 × 60 mm
- DIN Rail: TS32 / TS35 × 7.5
- Required Rail Length: 226 mm
- Approvals: CE, TÜV, UL, CSA, FM
- FC Construction: Conformal-coated
The above electrical and mechanical values are taken from Honeywell’s Safety Manager Hardware Reference rather than from generic reseller specifications.
System Architecture and Compatibility
The FC-TSGAS-1624 should be understood as part of this signal chain:
Gas/Flame Detector → FC- → SAI-1620m → Safety Manager
Honeywell specifically identifies the as a gas/flame detector input FTA and specifies its output to the SAI-1620m module.
That relationship is important when evaluating replacements. The FTA does not replace the SAI-1620m. Conversely, a generic 16-channel 4–20 mA FTA should not automatically be considered an equivalent substitute for FC-.
The standard TSAI-1620m is documented separately as a safe 0–20/4–20 mA analog-input FTA, while is specifically dedicated to gas/flame detector input applications. Honeywell maintains these as separate FTA categories.
The FC version also matters. Honeywell lists both and ; the certification record identifies FC- as the conformal-coated version.
Global Sourcing & Live-Test SOP
Inbound Verification
For incoming FC- inventory:
- Verify the exact marking .
- Check the Honeywell identification label and available hardware/revision information.
- Confirm the FC/conformal-coated construction.
- Inspect the 16 field-input terminals for damage or oxidation.
- Inspect the SAI-1620m-side connector for bent, recessed, or contaminated contacts.
- Inspect the fuse holder and verify the specified fuse arrangement.
- Check the long 225 mm enclosure for warping or impact damage.
- Confirm the mounting hardware is suitable for TS32/TS35 × 7.5 DIN rail.
Do not accept a generic listing described merely as “Honeywell 16-channel analog FTA.” The gas/flame detector interface designation is part of the compatibility requirement.
Live Simulation
The correct functional test requires a compatible SAI-1620m module and Safety Manager test environment.
A practical test should establish:
- Correct channel continuity.
- Correct common-0 V reference.
- Correct response to controlled current input.
- Correct 0–4 V conversion at the SAI-1620m interface.
- Correct channel mapping.
- Correct behavior of the fused supply circuit.
- Correct Safety Manager diagnostic response.
Do not test it as though it were a standard 24 VDC digital input card.
Analog Signal Verification
A calibrated current source is appropriate for verifying the analog conversion function.
Test points should include representative values within the documented operating range, with particular attention to the expected relationship between field current and the 0–4 V output presented to the SAI-1620m.
The 500 Ω input resistance is significant here. A current-loop test that ignores the FTA’s input characteristics can produce misleading results.
Final Preparation
Record:
- Exact model:
- Hardware/revision marking
- FC coating status
- SAI-1620m module used for verification
- Current-source test values
- Measured FTA output
- Fuse condition
- Channel continuity results
Protect the long PCB/terminal assembly against bending and connector impact during ESD-safe packaging.
Field Engineer’s Pitfall Guide
❗ Do not mistake FC- for a gas detector.
The part is a Field Termination Assembly. It does not perform gas sensing.
Its job is to interface compatible detector/transmitter current signals with the Safety Manager analog-input architecture. Honeywell’s certification description explicitly calls it a gas/flame detector input FTA.
❗ Do not substitute a generic 4–20 mA FTA without checking the conversion architecture.
The is not simply a row of analog terminals. Honeywell specifies a 500 Ω input resistance and conversion to 0–4 VDC for the SAI-1620m. That makes the connected input module part of the compatibility equation.
❗ Do not confuse FC- with FC-TSGASH-1624.
Honeywell separately lists TSGASH-1624, which adds a HART interface to the gas/flame detector FTA family. The standard should not be represented as a HART-enabled version unless the actual part marking confirms the TSGASH model.
Intent-Driven FAQ
What is Honeywell FC-?
It is a 16-channel Safe Gas / Flame Detector Input Field Termination Assembly for the Honeywell Safety Manager system. It interfaces 0–20 mA detector signals with the SAI-1620m analog input architecture.
Is FC- an analog input module?
No. It is an FTA, not the SAI-1620m input module. The FC- provides the field termination and signal interface; the SAI-1620m is the associated safe high-density analog input module.
How many channels does FC- have?
It has 16 input channels with a common 0 V.
What current signal does FC- accept?
Honeywell specifies an input current range of 0–25 mA, with the intended gas/flame detector application described as 0–20 mA.
What does FC- output to the SAI-1620m?
Honeywell specifies a 0–4 VDC output with 0.1% accuracy to the SAI-1620m module.
What is the input resistance?
The documented input resistance is 500 Ω ±5%.
What is the difference between FC- and FS-?
Both are FTA variants. The FC version is conformal-coated, while Honeywell identifies the FS version separately. The certification list assigns FC- part number 3440748 and revision CC.
Is FC- the same as FC-TSGASH-1624?
No. Honeywell lists TSGASH-1624 separately as the gas/flame detector input FTA with HART interface. Do not assume HART functionality on the standard TSGAS version.
Procurement Verdict
Honeywell FC- is a specialized Safety Manager FTA for 16-channel gas/flame detector current inputs.
The engineering identity is:
16-channel 0–20 mA gas/flame detector FTA → 500 Ω input → 0–4 VDC interface → SAI-1620m.
For replacement procurement, verify the exact designation, FC conformal-coated construction, 16-channel configuration, and compatibility with the installed SAI-1620m architecture.
