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T8433C

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T8433C
May 15, 2026

T8433C

The T8433C is a conformal coated, 20‑channel TMR isolated analogue input module for the Trusted T8000 Safety Instrumented System (SIS). It is the harsh‑environment coated variant of T8433, offering enhanced protection against moisture, dust, and corrosive gases, with a wider temperature range for safety‑critical applications in oil & gas, petrochemical, power, and process industries.

Description

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1. Introduction

The T8433C is a conformal coated, 20‑channel TMR isolated analogue input module for the Trusted T8000 Safety Instrumented System (SIS). It is the harsh‑environment coated variant of T8433, offering enhanced protection against moisture, dust, and corrosive gases, with a wider temperature range for safety‑critical applications in oil & gas, petrochemical, power, and process industries.
It provides triple‑modular redundant (TMR) current‑loop input acquisition for 4–20 mA field transmitters, with three independent measurement slices and 1oo2D fault voting per channel.

  • Function: 20‑channel isolated analogue input (4–20 mA / 0–20 mA configurable)

  • Architecture: Fully triplicated TMR (3‑2‑0 fault tolerant)

  • Safety: IEC 61508 SIL 3

  • Coating: Conformal coated (moisture / dust / corrosion resistance)

  • Operating Temp: –20 °C to +60 °C (extended harsh range)

  • Resolution: 12‑bit (1 part in 4096)

  • Isolation: 2500 VDC optical/magnetic 2‑stage galvanic isolation

  • SOE: 1 ms time‑stamp resolution

  • Hot‑swap: Supported (Companion Slot / SmartSlot)

  • Diagnostics: Per‑channel open/short/range fault detection

2. Product Overview

The T8433C is a single‑width, 6U TMR analogue input module with conformal coating for harsh industrial environments. It installs in T8100 / T8400 chassis and provides 20 independent, galvanically isolated 4–20 mA input channels, each with three redundant measurement paths and TMR voting logic.
Key features:

  • 20 channels isolated 4–20 mA analogue input (0–20 mA configurable)

  • Conformal coated PCB assembly (improved resistance to humidity, dust, chemical vapors)

  • Extended operating temperature: –20 °C to +60 °C

  • Triple Modular Redundancy (TMR) with HIFT architecture

  • Per‑channel open/short‑circuit and over/under‑range detection

  • 2500 VDC optical/magnetic 2‑stage galvanic isolation

  • 1 ms resolution SOE logging

  • Hot‑swap capable

  • Front‑panel LED status indicators (module + per‑channel)

  • Compatible with T8100 / T8400 chassis

  • Accuracy: 0.2% of span (25 °C)

3. Specifications

3.1 Mechanical

  • Form Factor: T8000 chassis single‑width module, 6U height

  • Dimensions (H × W × D): 241 mm × 30 mm × 300 mm

  • Weight: Approx. 1.13 kg

  • Mounting: T8100 / T8400 chassis slots 1–16

  • Terminals: Front‑panel screw terminals (20 channels)

  • Coating: Conformal coated (PCB and components protected)

3.2 Electrical

  • System Supply: 20–32 VDC (nominal 24 VDC)

  • Power Consumption: ≤ 15 W

  • Input Range: 4–20 mA (configurable for 0–20 mA)

  • Resolution: 12‑bit (1 part in 4096)

  • Accuracy: 0.2% of span (25 °C)

  • Temperature Drift: 50 ppm/°C

  • Isolation: 2500 VDC optical/magnetic 2‑stage galvanic isolation

  • Channel Crosstalk: –40 dB typical

  • Update Time: ≤ 1 ms per channel

  • Field Loop Supply: External (loop‑powered)

3.3 Functional

  • Redundancy: TMR (three independent slices)

  • Voting: 1oo2D per channel

  • Diagnostics:

    • Open‑circuit detection

    • Short‑circuit detection

    • Over‑/under‑range detection

    • On‑board BIST (periodic self‑test)

  • SOE Resolution: 1 ms

  • SOE Accuracy: ±0.5 ms

  • Response Time: ≤ 2 ms

  • Filtering: Configurable 50 Hz / 60 Hz rejection or fast response

3.4 Environmental (Key Difference from T8433)

  • Operating Temperature: –20 °C to +60 °C (T8433: –5 °C to +60 °C)

  • Storage Temperature: –40 °C to +85 °C

  • Humidity: 5–95 % RH, non‑condensing

  • Vibration: 10–57 Hz ±0.075 mm; 57–150 Hz 1.0 g

  • Shock: 15 g, ½ sine wave, 11 ms

  • Protection: Conformal coating against dust, moisture, corrosive gases

3.5 Safety & Certification

  • Safety Standard: IEC 61508 SIL 3

  • Approvals: CE, UL, CSA, ATEX, IECEx

  • Fault Tolerance: TMR (3‑2‑0)

  • PFHd: < 1.0 × 10⁻⁹ / hour (SIL 3)

4. Front Panel Indicators

  • PWR (Green): ON = module power healthy

  • RUN (Green): ON = active; FLASHING = BIST/initialization

  • FAULT (Red): ON = critical fault; FLASHING = minor fault

  • COM (Green): FLASHING = backplane communication active

  • CH1–CH20 LEDs: Reflect input status / fault per channel

5. Installation

  • Chassis: Insert into any vacant slot in T8100 / T8400 chassis

  • Hot‑Swap: Supported (Companion Slot / SmartSlot)

  • Front‑Panel Screws: Torque 0.8–1.0 Nm

  • Environment: Suitable for humid, dusty, or mildly corrosive locations

6. Wiring

  • Signal Type: 4–20 mA / 0–20 mA current loop

  • Field Connection:

    • Transmitter + → channel +

    • Transmitter – → channel –

  • Wire Gauge: 16–22 AWG stranded

  • Terminal Torque: 0.5–0.6 Nm

7. Operation

  • Power‑Up: PWR ON; RUN flashes during BIST (5–10 s)

  • Normal: PWR/RUN steady green; FAULT OFF; COM flashing

  • Faults:

    • FAULT ON: TMR mismatch, short circuit, overrange

    • FAULT FLASHING: Single‑path fault, minor mismatch

  • SOE: All analogue threshold crossings time‑stamped at 1 ms

8. Ordering Information

  • T8433: Standard 20‑ch TMR 4–20 mA input (–5 °C to +60 °C)

  • T8433C: Conformal coated, –20 °C to +60 °C (harsh environment)

  • T8833: Field Termination Assembly (FTA)

  • TC‑T8433: Terminal cable kit

  • T8100 / T8400: Trusted chassis


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