GE DS3826SSHN | Mark V Analog Input Module | In Stock

Description

Product Introduction

The GE DS3826SSHN is a high-accuracy analog input module for the Speedtronic Mark V turbine control system, providing eight isolated channels for monitoring a wide range of process variables. This board mounts directly into the Mark V rack and interfaces with the backplane, converting analog field signals into digital readings for the CPU.

The “SSHN” designation indicates a module with eight channels supporting 4-20 mA and ±10V inputs, with high-accuracy signal conditioning and high common-mode rejection. This board is designed for monitoring critical process variables in turbine control systems, including pressure transmitters, position transducers, flow meters, and other industrial sensors. It is commonly used in steam and gas turbine applications for monitoring main steam pressure, reheat pressure, extraction pressure, control valve position, and other critical process signals.

Key Technical Specifications

Key Selling Points & Differentiators

• 8 isolated channels. High channel density in a single slot with full isolation per channel, eliminating ground loops and protecting the CPU from field wiring faults.
• Dual input support. Both 4-20 mA and ±10V inputs are supported, with per-channel software configuration.
• Internal 4-20 mA loop power. No external power supply needed for loop-powered transmitters, simplifying wiring and reducing cabinet complexity.
• 130 dB common-mode rejection. Superior rejection of ground-loop noise and common-mode interference in large industrial installations with distributed sensors.
• 16-bit resolution. High-resolution readings for precision process monitoring and control.
• Per-channel configurability. Each of the 8 channels can be independently configured for 4-20 mA or ±10V through the Mark V software—no hardware jumpers required.
• 48-hour burn-in with accuracy verification. Every unit is tested with precision current sources and voltage sources across the full operating range.
• 18-month warranty covering accuracy and channel integrity. If any channel fails to meet accuracy spec, we replace the board.

Frequently Asked Questions (FAQ)

Q: What is the difference between the DS3826SSHN and the DS3826AS1D06AA?

A: The DS3826SSHN has 8 channels versus 6 channels on the AS1D06AA. The SSHN supports only 4-20 mA and ±10V inputs, while the AS1D06AA also supports thermocouple inputs (J, K, T). The SSHN has slightly higher CMRR (130 dB versus 120 dB). If you need thermocouple support, use the AS1D06AA or a dedicated thermocouple module. If you need high-density analog inputs with excellent noise rejection, the SSHN is the better choice.

Q: What input types does the DS3826SSHN support?

A: The board supports 4-20 mA (current loops) and ±10V (voltage signals). Each of the 8 channels can be independently configured for either input type through the Mark V software.

Q: Can I use this board with 4-20 mA pressure transmitters?

A: Yes—the board supports 4-20 mA inputs with internal 24V loop power. Connect the two-wire transmitter directly to the input terminals—no external power supply needed. The board’s 250Ω burden resistor converts the current to a voltage for measurement.

Q: Can I use this board with ±10V position transducers?

A: Yes—the board supports ±10V voltage inputs with >10 MΩ input impedance. Connect the transducer’s signal output directly to the input terminals. The board measures the voltage with 16-bit resolution and scales it to engineering units in the CPU.

Q: Does the board have individual channel isolation?

A: Yes—each of the 8 channels has 2500V isolation from the backplane and from other channels. This allows the board to handle field wiring faults, ground loops, and signal noise without affecting the CPU or other channels.

Q: What is the 4-20 mA loop power voltage?

A: The internal loop power provides 24V DC nominal. The actual voltage may be slightly higher or lower depending on loop resistance, but it is regulated to maintain at least 18V at the transmitter under full load (20 mA, 250Ω burden, plus cable resistance).

Q: What is the update rate of the board?

A: The board scans all 8 channels at 10 Hz (100ms per full scan). Each channel is sampled and converted every 100ms. This update rate is sufficient for most process monitoring and control applications.

Q: Does the DS3826SSHN have conformal coating?

A: Not in the standard version. If you need conformal coating, a gold-plated terminal block, or extended temperature range, you would need a variant such as DS3826SSHN1A1A or DS3826SSHN1C1A. These variants are rare—contact us for availability.

Q: Is the DS3826SSHN a direct replacement for the DS3826SSHA?

A: The DS3826SSHN is a newer revision. The board is mechanically and electrically compatible with the earlier DS3826SSHA—same form factor, same DIN connector, same pinout, same field wiring. The newer revision includes updated components and improved noise rejection. Check your system’s configuration to ensure compatibility.

Q: What is the warranty on this board?

A: 18 months from shipment, covering accuracy, channel integrity, and loop power functionality. If the board fails to meet accuracy spec or the loop power supply fails, we replace it. The warranty does not cover physical damage or miswiring.

Q: Do you have many of these boards in stock?

A: We typically have 5-8 units of the DS3826SSHN in stock. If you need larger quantities, contact us directly to confirm availability. This board is popular for retrofit and maintenance applications in both steam and gas turbine systems.

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