GE IS200DTAIH1ACC | Digital Thermocouple Analog Input Board

IS200DTAIH1ACC is a DTAI (Digital‑Thermocouple‑Analog‑Input) hardware‑revision control PCB for GE Mark VI Speedtronic control platform. Optimized for multi‑channel thermocouple signal acquisition and high‑precision temperature conversion, it acquires thermal sensor readings from gas‑turbine exhaust, bearing and hot‑gas‑path measurement points, converts raw thermocouple millivolt signals into calibrated digital temperature data for turbine protection, condition monitoring and performance‑calculation logic within power‑generation control systems。

This board receives multi‑channel low‑level millivolt thermocouple signals from field temperature sensors. It executes cold‑junction compensation, signal filtering and high‑resolution analog‑to‑digital conversion, then transmits calibrated temperature values to main controller via Mark VI VME backplane bus. Comprehensive on‑board hardware diagnostics detect open‑circuit sensor breaks, signal out‑of‑range, channel short‑circuit and internal hardware anomalies, storing timestamped fault events in onboard flash memory for post‑failure analysis via GE Mark VI turbine control software toolkit. The PCB adopts conformal‑coating treatment for anti‑humidity and anti‑corrosion performance to adapt harsh cabinet operating environments of power‑plant sites. Front‑mounted faceplate provides status LED indicators for power, channel activity and fault alarm for on‑site troubleshooting。

Hardware specifications: Full part identifier: IS200DTAIH1ACC Form factor: Standard VME rack‑mount PCB with integrated front faceplate Compatible platform: GE Mark VI Speedtronic control system, supports simplex and TMR triple‑modular‑redundant architecture Measurement type: Multi‑channel thermocouple input with built‑in cold‑junction compensation Signal processing: Low‑noise instrumentation amplifiers, digital filtering for thermal‑signal noise suppression On‑board resources: High‑resolution A/D converter, flash memory for fault‑event logging, front‑panel LED status indicators Backplane interface: VME backplane connector for data bus, address bus and control signal exchange Backplane power supply: 24 VDC backplane power supply, typical power consumption approx 9 W Operating temperature: ‑40°C ~ +70°C; storage temperature: ‑40°C ~ +85°C Humidity: 5%‑95% non‑condensing environment Conformal‑coated printed circuit board for harsh power‑plant cabinet conditions Weight: approx 0.75 kg

Typical applications: gas‑turbine exhaust‑gas temperature monitoring, turbine bearing temperature surveillance, hot‑gas‑path thermal measurement, steam‑turbine auxiliary‑equipment temperature acquisition, turbine over‑temperature protection interlock logic, spare‑part replacement and retrofitting of existing legacy Mark VI installations。

Product status: Original OEM unit, fully discontinued by GE Vernova. We supply surplus new stock and fully‑tested used‑refurbished spare units. Warranty is available for all delivered goods. Items are ready for international shipment.

Frequently Asked Questions Q1: What does suffix ACC stand for IS200DTAIH1ACC? A: ACC represents the specific hardware revision code of this DTAI thermocouple input board. Different suffix variants correspond to cold‑junction compensation circuit and channel‑filter component revisions. Full part number including suffix must be confirmed before replacement to avoid temperature‑reading deviation.

Q2: Can IS200DTAIH1ACC be deployed on Mark VIe platform? A: IS200DTAIH1ACC is designed for legacy Mark VI VME‑bus architecture. It is not natively compatible with Mark VIe / Mark VIe‑S without hardware modification and full firmware migration. Cross‑platform direct installation is not permitted.

Q3: What is the difference between DTAI IS200DTAIH1ACC and VRTD RTD input boards? A: IS200DTAIH1ACC is dedicated for thermocouple millivolt‑type temperature sensors with cold‑junction compensation function. VRTD series boards are for resistance‑type RTD temperature sensors. Hardware front‑end circuits and signal‑processing algorithms are not interchangeable.

Q5: What software is required for configuration and fault diagnosis? A: Parameter configuration, commissioning and fault‑log reading are completed through GE dedicated Mark VI turbine control software toolkit. On‑board flash memory saves timestamped fault‑event records for troubleshooting. The hardware itself does not store user application project files.

Q6: Is IS200DTAIH1ACC still in production? A: This board is completely discontinued by GE Vernova. We provide original surplus new stock and fully‑tested refurbished spare parts for legacy power‑plant and turbine‑monitoring‑system maintenance.

Q7: Why abnormal temperature readings or sensor‑open faults occur after board replacement? A: Common root causes: mismatched hardware revision suffix, incorrect thermocouple type configuration settings, defective field sensor wiring or cold‑junction loop faults, shielding‑grounding defects, incomplete parameter download. Always verify full part‑number before installation and validate all channel temperature readings after hardware swap.

Q8: Does IS200DTAIH1ACC come with conformal coating? A: Yes, original unit is conformal‑coated on PCB surface to resist moisture and corrosive gas inside power‑plant control cabinets.