GE DS3826SSHN

Description

Parameters

Advantages & Features

• Universal I/O Flexibility – Each input channel on the GE DS3826SSHN can be independently configured for voltage, current, or thermocouple via software, eliminating the need for multiple dedicated cards and reducing spare parts inventory.

• High Noise Immunity – Differential inputs with common-mode rejection >100 dB at 50/60 Hz, plus integrated EMI/RFI filtering, ensure stable readings in variable-frequency drive (VFD) environments.

• Hot-Swappable Design – The GE DS3826SSHN supports live insertion and removal without powering down the rack, minimizing downtime during maintenance or channel expansion.

• Built-In Self-Test (BIST) – Power-on and continuous background diagnostics verify ADC/DAC integrity, reference voltage stability, and output drive capability; fault conditions are reported via the backplane status word and front-panel LED indicators.

• Redundant Power Input – Dual diode-ORed 24 VDC terminals allow connection to two independent power supplies for high-availability systems.

• Firmware Upgradeable – Onboard Flash memory enables field updates via the Mark VIe toolset, ensuring the GE DS3826SSHN can support future signal protocols without hardware revision.

Application Cases

• Steam Turbine Speed & Load Control – Used in combined-cycle power plants to acquire LVDT feedback from valve positioners (4–20 mA) and output control signals to electro-hydraulic converters, with the GE DS3826SSHN providing <2 ms response time for governor loops.

• Generator Excitation Systems – Monitors field voltage/current and stator temperature via thermocouples, while generating reference signals for the digital automatic voltage regulator (AVR). A single GE DS3826SSHN replaces up to three conventional analog cards in legacy GE EX2100 upgrades.

• Oil & Gas Pipeline SCADA – Deployed at remote compressor stations to read pressure transmitters and flowmeters, and output 4–20 mA to variable speed drives for surge control, operating continuously at -30 °C ambient with documented MTBF >1.2 million hours.

• Water/Wastewater Treatment – Interfaces with pH sensors, dissolved oxygen probes, and level transmitters, while controlling chemical dosing pumps. The GE DS3826SSHN’s open-wire detection alerts operators to broken sensor cables before process deviation occurs.

Competitor Comparison

The GE DS3826SSHN offers a unique combination of high channel density (16 in + 8 out) and wide temperature range, outperforming Siemens and Rockwell in extreme environments. While ABB provides higher isolation, it requires separate input and output modules, increasing rack space and wiring complexity. For SIL 2 applications with limited cabinet footprint, the GE DS3826SSHN is clearly superior.

Selection Suggestions

• Choose the GE DS3826SSHN if your application requires both analog input and output in a single slot, especially for turbine/excitation systems where space is constrained and mixed signal types (TC + mA + V) are present.

• For new Mark VIe systems, always pair the GE DS3826SSHN with the appropriate terminal block (e.g., TB300B) to match your field wiring type (screw clamp or DB37). Verify that your controller firmware is at least Mark VIe v7.2 to support all thermocouple linearization tables.

• If your process has >8 analog outputs, consider using two GE DS3826SSHN modules instead of adding separate output cards to maintain synchronization via the backplane timestamp feature.

• For SIL 2 safety loops, order the GE DS3826SSHN with the optional factory calibration certificate (option -C) and perform a loop test with a certified 6-decade resistor box during commissioning.

• When retrofitting from legacy Mark IV or V, note that the GE DS3826SSHN uses 24 VDC logic levels, not the older 125 VDC; a dedicated power conversion stage is required.

Precautions

• Grounding – Strictly follow the single-point grounding scheme in GEH-6721. The GE DS3826SSHN’s differential inputs can tolerate common-mode voltage up to ±12 V, but exceeding this will saturate the input amplifier and produce false readings.

• Loop Power – Output channels configured for 4–20 mA require an external 24 VDC supply with at least 500 mA per channel if driving passive loads; do not rely on the module’s internal bus power for >2 outputs simultaneously.

• ESD Protection – The front-panel D-sub connector is ESD-sensitive. Always wear a grounded wrist strap when handling the GE DS3826SSHN outside the rack. Damaged input channels are not field-repairable.

A-B 1747-BA
HONEYWELL ˿
A-B 1756-BA1