HIMA F3238 is a 8-channel SIL3 safety DI module of the HIMatrix series. It supports NAMUR / intrinsically safe sensors. It is on the same platform as F3237, having similar functions but with different electrical characteristics. It is currently in production.

HIMA F3238 is a 8-channel SIL3 safety DI module of the HIMatrix series. It supports NAMUR / intrinsically safe sensors. It is on the same platform as F3237, having similar functions but with different electrical characteristics. It is currently in production.

II. Core Electrical Specifications

Channels: 8 channels, each channel with independent diagnosis (open circuit / short circuit / line resistance)

Input current (NAMUR):

0 signal: 0.4 - 1.1 mA

1 signal: 2.2 - 5.8 mA

Open circuit: ≤ 0.3 mA; Short circuit: ≥ 6.8 mA

Line length / line resistance: ≤ 1000m (0.5mm²); ≤ 50Ω

Isolation: 2 kVrms; Response time: typical 12 ms

Power supply: Backplane 5 VDC (100 mA) + 24 VDC (180 mA)

Environment: -20 ℃ to +60 ℃, IP20; Supports Ex (i) explosion-proof areas

Diagnosis: Fault coverage > 99%, Stores 500 logs

III. F3238 vs F3237 (Same Platform 8-channel DI)

F3238: Intrinsically safe Ex ia certification, slightly wider current threshold, suitable for explosion-proof long-distance sensors

F3237: Standard NAMUR, no intrinsically safe certification, lower cost, preferred for conventional non-explosion-proof scenarios

IV. Selection Suggestions

Conventional non-explosion-proof 8-channel DI: Prefer F3237 (High性价比)

Explosion-proof / Intrinsically safe (Ex ia) scenarios： Choose F3238

16-channel DI： Select the same series F3226A (In production)