Core Configuration

Channels: 8 channels of common return, DC coupling, 4–20mA analog output

Output Range: 4–20mA, supports +6% overrange (up to 21.2mA)

Resolution: 12 bits

Accuracy: <0.25% FS (full scale)

Architecture: TMR triple redundancy, 2oo3 voting, safety-critical

Isolation: No channel-to-channel isolation, common circuit; Backplane - channel-to-channel 1500V isolation

Diagnosis: Open circuit, short circuit, overload, inconsistent voting, load failure

Maintenance: Hot-swappable, online replacement without stopping

Status Indicators: PASS/Fault/ACTIVE and channel LEDs Electrical parameters

Output current: 4–20mA (overrange 21.2mA)

Load resistance: Maximum 750Ω (24VDC power supply)

Backplane power supply: 5VDC / 24VDC

Power consumption: ≤10W

Operating temperature: -40°C ~ +70°C

Humidity: 5–95% RH (no condensation)

Certifications: SIL3, CE, UL, CSA, ATEX Zone 2, TÜV

Size / Weight: 175×100×50mm / Approximately 2.5kg

Key features

TMR triple redundancy: Three-channel independent output + voting, no single-point failure, SIL3 safety level

High-precision output: 12 bits + <0.25% accuracy, meeting the precise control requirements of regulating valves / positioners

Wide load compatibility: Maximum 750Ω, suitable for various 4–20mA regulating valves, valve positioners

Complete diagnostics: Real-time detection of open circuit / short circuit / overload, precise fault location

Wide temperature + hot-swappable: -40°C ~ +70°C, online maintenance does not affect interlocks

Fault-safe design: System power loss / fault, output in safe state (configurable as 4mA or 20mA)

Typical applications

SIS/ESD regulating control: SIL3 level regulating valves, emergency shut-off valve positioning control

BMS combustion management: Fuel valve, air volume regulating valve, proportional valve precise control

Key unit control: Compressor / turbine anti-surge valve, speed control loop

Process parameter regulation: Temperature, pressure, flow closed-loop control (safety-level loop)

Safety regulating circuits requiring high reliability and high-precision 4–20mA output

Overview of AO modules in the same series

3805H: 8 channels, 4–20mA, TMR, SIL3 (commonly used)

3806E: 8 channels, 4–20mA, isolated, TMR, SIL3

3801E: 4 channels, 4–20mA/0–10V selectable, TMR, SIL3