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Key Technical Specifications
| Parameter | Value |
|---|---|
| Manufacturer | Honeywell |
| Model | FC-TSGAS-1624 |
| System | Safety Manager |
| Product Type | Safe Gas / Flame Detector Input FTA |
| Number of Input Channels | 16 |
| Field Signal | 0–20 mA |
| Documented Input Range | 0–25 mA |
| Input Configuration | 16 channels with common 0 V |
| Input Resistance | 500 Ω ±5% |
| External Supply | 24 VDC |
| Module Supply Consumption | 3 mA, excluding field loads |
| Output to SAI-1620m | 0–4 VDC |
| Conversion Accuracy | 0.1% |
| Fuse Rating | 500 mAT, slow-acting |
| Module Dimensions | 225 × 70 × 60 mm |
| Mounting Rail | TS32 / TS35 × 7.5 DIN EN rail |
| Used Rail Length | 226 mm |
| Field Terminal Max. Wire Size | 2.5 mm² / AWG 14 |
| Field Terminal Strip Length | 7 mm |
| Field Terminal Tightening Torque | 0.5 Nm / 0.37 ft-lb |
| Power Terminal Max. Wire Size | 16 mm² / AWG 8 |
| Power Terminal Strip Length | 7 mm |
| Power Terminal Tightening Torque | 1.2 Nm / 0.88 ft-lb |
| Construction | Conformal-coated FC type |
| Approvals Listed | CE, TÜV, UL, CSA, FM |
Honeywell’s hardware reference specifies the TSGAS-1624 electrical, mechanical, fuse, rail, and terminal data above.
Signal Conversion
The FC-TSGAS-1624 accepts the gas/flame detector’s current signal and provides a corresponding 0–4 VDC signal to the SAI-1620m. Honeywell specifies 0.1% accuracy for this conversion.
The 500 Ω input resistance is important when checking the connected detector’s loop compliance and available voltage. It should not be treated as a generic 4–20 mA input terminal block.
Product Introduction
The Honeywell FC-TSGAS-1624 is a 16-channel Safe Gas / Flame Detector Input Field Termination Assembly used in Honeywell Safety Manager systems. Its function is to provide the field interface between approved gas/flame detector circuits and the SAI-1620m safe high-density analog input module. Honeywell’s hardware reference explicitly describes the TSGAS-1624 as the interface between field gas/flame detectors and the SAI-1620m.
Each of the 16 channels accepts a current signal. Honeywell’s technical specification identifies the signal as 0–20 mA, while the electrical input specification is 0–25 mA. The FTA converts the field current signal to a 0–4 VDC signal for the SAI-1620m, with a specified conversion accuracy of 0.1%.
The FC version is the conformal-coated configuration. Honeywell’s Safety Manager certification list distinguishes FC-TSGAS-1624 from the non-conformal-coated FS- and assigns FC- the Honeywell part number 3440748.
FC-TSGAS-1624
FC-TSGAS-1624
Field Power Distribution
The FTA also interfaces with the external 24 VDC field supply. The module itself consumes only 3 mA without field loads, so the connected detector loads must be considered separately when sizing the field supply.
Each channel is associated with fuse protection. The documented fuse specification is 500 mAT slow-acting. This should be checked carefully during maintenance because replacing the specified fuse with an incorrect rating can alter the intended field-circuit protection.
Mechanical Installation
The FC- uses a universal snap-in arrangement for standard DIN EN rails. Honeywell specifies TS32 or TS35 × 7.5 rails and a used rail length of approximately 226 mm. The module dimensions are 225 × 70 × 60 mm.
Field connections use screw terminals. Honeywell specifies a maximum field-wire size of 2.5 mm² (AWG 14), while the power terminals accept up to 16 mm² (AWG 8). Different tightening torques apply to the two terminal groups.
FC- vs. FS-
Honeywell documents both:
- — non-conformal-coated version
- — conformal-coated version
The certification release list identifies FC- with the CC designation and Honeywell part number 3440748.
For replacement work, the FC/FS distinction should be maintained where the installed system specification calls for the conformal-coated construction.
Installation & Configuration Guide
5.1 Verify the Complete Signal Chain
Before replacing an FC-, identify the complete signal path:
Gas/Flame Detector → FC- → SICC-0001/Lx → SAI-1620m
Honeywell states that the uses an SICC-0001/Lx system interconnection cable to transfer its 16 input signals to a redundant pair of SAI-1620m modules.
Do not evaluate the FTA independently from the SAI-1620m and interconnection cable.
5.2 Confirm the Detector Signal
Verify the installed detector’s actual output before wiring:
- Nominal signal range
- Maximum loop current
- Detector power requirement
- Polarity
- Common 0 V arrangement
- Loop resistance
- Alarm-state current
- Fault-state current
The FC- documentation specifies a 0–25 mA electrical input range and 500 Ω ±5% input resistance.
A detector should not be connected solely because its transmitter is described generally as a “4–20 mA gas detector.” The complete detector/FTA/Safety Manager interface must match the approved system design.
5.3 Check the 24 VDC Field Supply
Verify the external 24 VDC supply before commissioning.
The FTA’s own consumption is specified as 3 mA without field loads, but the connected gas/flame detectors consume additional current. Therefore, supply sizing must account for the complete 16-channel field load rather than using the FTA’s 3 mA figure as the total cabinet requirement.
5.4 Fuse Inspection
The specified fuse is:
500 mAT, slow-acting
Check the fuse type and rating during maintenance. If a channel repeatedly opens its fuse, investigate the detector wiring, field device, power distribution, and short-circuit condition instead of simply installing a higher-rated fuse.
5.5 Wiring and Terminal Torque
For field terminals, Honeywell specifies:
- Maximum conductor: 2.5 mm² / AWG 14
- Strip length: 7 mm
- Tightening torque: 0.5 Nm / 0.37 ft-lb
For power terminals:
- Maximum conductor: 16 mm² / AWG 8
- Strip length: 7 mm
- Tightening torque: 1.2 Nm / 0.88 ft-lb
Use the specified terminal torque rather than applying a generic cabinet-terminal torque value.
5.6 Commissioning Checks
After installation, verify the complete channel path:
- FC- physical installation
- 24 VDC supply polarity and voltage
- Ground connection
- Correct detector channel assignment
- Fuse status
- Detector loop current
- FTA output signal
- SICC interconnection
- SAI-1620m input reading
- Safety Manager application value
- Alarm state
- Detector fault state
- Line fault response
For safety-related gas detection, final commissioning should follow the approved site test procedure and applicable Safety Manager documentation.
5.7 Replacement Trap: FTA vs. SAI-1620m
The FC- and SAI-1620m are different components.
field termination, power distribution, current-to-voltage conversion.
SAI-1620m: safe high-density analog input electronics.
Honeywell explicitly defines the as the interface between the field detectors and SAI-1620m.
If a Safety Manager diagnostic identifies an analog-input problem, do not automatically replace the FTA. First determine whether the fault is located in the detector, field wiring, FTA, interconnection cable, or SAI-1620m.
FAQ
What is Honeywell FC-?
It is a 16-channel Safe Gas / Flame Detector Input Field Termination Assembly for Honeywell Safety Manager. It interfaces gas/flame detectors with the SAI-1620m safe high-density analog input module.
Is FC- an analog input module?
No. It is an FTA. The SAI-1620m performs the analog input function, while FC- provides field termination and signal conversion.
How many channels does FC- have?
It has 16 analog input channels, with a common 0 V reference.
What input signal does FC- accept?
Honeywell identifies the FTA as a 0–20 mA gas/flame detector input. The detailed electrical specification gives an input range of 0–25 mA.
What signal does FC- send to the SAI-1620m?
It provides a 0–4 VDC signal to the SAI-1620m, with specified conversion accuracy of 0.1%.
What is the input resistance?
The specified input resistance is 500 Ω ±5%.
What power supply does FC- require?
The FTA uses an external 24 VDC supply. Its own consumption is specified as 3 mA without field loads. Connected detector loads must be added separately when calculating the required field supply capacity.
What is the FC version?
The FC designation identifies the conformal-coated version. Honeywell lists FC- separately from the FS- non-conformal-coated version.
What is the Honeywell part number for FC-?
Honeywell’s Safety Manager certification list associates FC- with part number 3440748.
What are the dimensions of FC-?
Honeywell specifies 225 × 70 × 60 mm (L × W × H). The FTA mounts on TS32 or TS35 × 7.5 DIN EN rails.
What fuse is used?
The documented fuse specification is 500 mAT, slow-acting.
Which module is used with FC-?
The FTA interfaces with Honeywell’s SAI-1620m safe high-density analog input module. Honeywell documents the as the field interface between gas/flame detectors and SAI-1620m.
Is FC- suitable for gas and flame detection systems?
Its documented application is specifically safe gas/flame detector input in Honeywell Safety Manager. The connected detector, field wiring, FTA, interconnection cable, and SAI-1620m configuration must all match the approved system design.
What should be verified before purchasing a replacement?
Verify the exact FC- model, conformal-coated FC construction, hardware revision, Honeywell part number 3440748 where applicable, field detector interface, SAI-1620m compatibility, and physical condition. For a safety-system spare, matching only the base model number is not sufficient.
