Model Interpretation

• 3700: 32‑Channel TMR Analog Input Module, 0–5VDC, differential

• 3700A: 3700 with enhanced 0–5V ±6% range compatibility

• P/N: 3700 (base model, TMR integral)

• Compatibility: Tricon v9–v12 chassis (8110/8111/8112/8115/8116); hot‑swappable

• Key Feature: 32 differential channels, 0–5VDC, 12‑bit, high‑impedance, TMR

Technical Parameters

Electrical & Input

• Input Type: Differential, DC‑coupled

• Voltage Range: 0–5VDC (3700A: 0–5V ±6%)

• Channels: 32, differential (non‑isolated channel‑to‑channel)

• Resolution: 12 bits

• Accuracy: <±0.15% FSR (0–60°C)

• Input Impedance: ≥30MΩ (DC)

• Response Time: <55ms (all channels updated)

• Backplane Power: 24VDC, ≤15W (full load)

• Isolation: 1,500VDC field‑to‑backplane galvanic isolation

• Common‑Mode Rejection: ≥−80dB (DC–100Hz)

Redundancy & Safety

• Architecture: Triple Modular Redundancy (TMR), 2oo3 voting

• Safety Certification: IEC 61508 SIL3, TÜV, UL, CE, ATEX, FM

• Diagnostics: Per‑channel continuous diagnostics; fault coverage >99.9%; SOE ≤40ms

• MTBF: >150,000 hours

Mechanical

• Form Factor: 3U, 19” rack, 1 slot

• Dimensions (W×H×D): 114 × 30 × 185 mm

• Weight: ~1.2 kg (2.6 lbs)

• Mounting: Plug‑in backplane, hot‑swappable

• Color Code: Dark Red

Environmental

• Operating Temp: −40°C to +70°C

• Storage Temp: −40°C to +85°C

• Humidity: 5%–95% RH, non‑condensing

Diagnostics & Indicators

• LEDs: PASS, FAULT, ACTIVE, TMR, ALARM

• Fault Detection: Over/under‑range, TMR deviation, channel fault

Core Functions

1. 32‑Channel High‑Precision 0–5VDC Input

   Monitors analog transmitters (pressure, temp, flow, level); 12‑bit resolution and ±0.15% accuracy ensure reliable safety loop measurements.
2. TMR Fault‑Tolerant Analog Monitoring

   Three independent measurement circuits with 2oo3 voting; eliminates single‑point failures for SIL3 ESD/F&G/BMS applications.
3. High Noise Immunity & Isolation

   1,500VDC field‑to‑backplane isolation and −80dB common‑mode rejection suppress ground loops and EMI in harsh industrial environments.
4. Hot‑Swap & Online Maintenance

   Replace module without system shutdown; per‑channel diagnostics and SOE logging support IEC 61511 compliance.
5. Continuous Channel Diagnostics

   Detects over/under‑range, signal drift, and TMR mismatches; up to 2 faulty channels allowed without module replacement.

Applications

• Oil & Gas: ESD/F&G systems; pressure/temperature monitoring on pipelines and platforms

• Chemical/Refining: HIPPS loops; reactor/column analog signal monitoring

• Power Generation: Turbine ESD; boiler BMS with pressure/flow transmitters

• SIS Retrofits: High‑density analog monitoring in existing Tricon chassis