HIMA F3224A4 is an explosion-proof / intrinsically safe enhanced version (Ex i) of F3224A, featuring 16 SIL3 safety digital input DI, with ATEX certification. It is no longer in production and is only available as spare parts.

1. Basic Information

Model: F3224A4 (Intrinsically safe version of F3224A)

Brand/Series: HIMA (Black Horse) / F3 Series (19" Rack-mounted SIS)

Function: 16 intrinsically safe (Ex i) safety digital input DI

Safety Level: SIL3 (IEC 61508), TÜV certification, ATEX II 2G Ex ib IIC T4

Programming Software: ELOP II

Status:停产 (EOL)， Original factory has no new stock， available for second-hand / inventory / refurbished supply

II. Electrical Specifications (Enhanced explosion-proof based on F3224A)

Channels: 16 DI, each channel is independently diagnosed and isolated safely

Input signals: 24 VDC dry contacts / 8 mA NAMUR sensors (specific for explosion-proof area)

Isolation: 2.5 kVrms high isolation + safe explosion-proof isolation (Ex ib)

Response time: Typical 8 ms

Power supply: Backplane 5 VDC (80 mA) or external 24 VDC (150 mA)

Diagnosis: Open circuit / short circuit / line resistance detection, channel-level fault isolation, explosion-proof circuit monitoring

Environment: 0 ℃～+60 ℃, IP20, ATEX explosion-proof zone 1/2 area available

Size / Weight: 19" rack, 4TE wide; approximately 0.12 kg

III. Meaning of Model Suffix "A4" (Key Differences)

A: Improved version of F3224 (same function, compatible interchange)

4: Explosion-proof (Ex i) + ATEX certification, suitable for flammable and explosive hazardous areas

Compared with F3224A: F3224A4 adds explosion-proof isolation barrier, safe explosion-proof certification, suitable for hazardous areas, and can be directly replaced in non-hazardous areas

IV. Comparison of DI Modules in the Same Series (Including Explosion-proof Version)

F3221/F322116: 16DI, 2 kV isolation, 10 ms, basic diagnosis (normal area)

F3222: 16DI, 2 kV isolation, 10 ms, enhanced diagnosis (normal area)

F3224/F3224A: 16DI, 2.5 kV high isolation, 8 ms, complete diagnosis (normal area)

F3224A4: 16DI, 2.5 kV + safe explosion-proof isolation, 8 ms, explosion-proof diagnosis (hazardous area / Ex i)

V. Replacement Suggestions

Direct replacement in hazardous areas: No exact equivalent model available, use F3224A + external safe explosion-proof isolation barrier

Compatible replacement in normal areas: F3224A (functionally the same, non-explosion-proof)

System upgrade: HIMatrix F35 or HIMax (SILworX, modern I/O, explosion-proof models available)