GE DS3800DGRA In Stock | New Surplus Mark IV Data Pack

Description

Product Introduction

The plant’s data recorder was an older analog unit—no serial interface, just voltage inputs. The DS3800DGRA has both serial and analog outputs, so it can talk to legacy data recorders without a converter. Installed the DGRA, connected it to the old recorder, and the data started flowing.

GE’s DS3800DGRA is the data recorder interface module for the Mark IV Speedtronic turbine control system. It formats turbine data for transmission to external data recorders (both serial and analog), providing real-time and historical data capture. The module has serial interfaces (RS-232, RS-422) and analog outputs (0-10 V, 4-20 mA) for compatibility with older recorder types.

Key Technical Specifications

• Function: Data recorder interface
• Output Types: Serial (RS-232, RS-422) and Analog (0-10 V, 4-20 mA)
• Analog Outputs: 8 channels (configurable)
• Communications Ports: 2 x RS-232, 2 x RS-422 (configurable)
• Data Formats: Raw, CSV, proprietary (configurable)
• Data Rate: 9600, 19200, 38400 baud (configurable)
• Data Channels: 32 analog, 64 digital (configurable)
• Analog Output Range: 0-10 V or 4-20 mA (jumper selectable)
• Backplane Connector: 96-pin DIN (VME form factor)
• Connector Type: 37-pin D-sub (field communications)
• LED Indicators: Module status (green), communications activity (flashing)
• Operating Temperature: –30 to +65 °C ambient

Quality Inspection Process (SOP Transparency)

This is what every DS3800DGRA goes through before it ships:

Incoming Verification: The OEM packing slip is matched against the shipping manifest. Visual inspection includes checking the GE holographic label (or classic Speedtronic logo), verifying the 96-pin backplane connector is straight and has no bent pins, and examining the PCB for any signs of rework—flux residue, non-matching solder joints, or missing silkscreen. We also check the 37-pin D-sub connector for bent pins.

Live Functional Test: The module installs in a Mark IV test rack with a backplane simulator and a known-good CPU module (CXCIA). Power-on self-check: the LED should illuminate green.

We test the serial ports by connecting a test data recorder to the DGRA’s RS-232 port and verifying the module sends formatted data. We test the analog outputs by connecting a precision multimeter to each of the 8 analog output channels and verifying the output voltage/current matches the commanded value.

We test the serial ports at 9600, 19200, and 38400 baud. We verify the DGRA formats the data correctly—all 32 analog and 64 digital channels are transmitted.

Electrical Parameters: A Fluke 1587 insulation tester measures isolation between the data recorder interface and the backplane. We look for >20 MΩ at 500 VDC. Power consumption is measured at idle and at full load—must be <3.5 W.

Mechanical Inspection: The VME connector is inspected for bent pins. The D-sub connector is inspected for bent pins. The mounting holes are checked for alignment.

Final QC & Packaging: The QC report lists the communications test, the analog output test, the data formatting test, and the isolation measurements. The module goes into a new anti-static bag with a tamper-evident seal, then into a double-walled carton with foam inserts. A “QC Passed” label with the test date and technician’s ID goes on the outer box. All test data and photos are available on request.

Field Replacement Pitfalls

The DS3800DGRA is the data recorder interface with analog outputs. Here’s the field-tested list:

Baud Rate Mismatch
The DGRA’s serial ports must be configured to match the data recorder’s baud rate. ❗ Photograph the old module’s baud rate switches before removal. Replicate them on the new module.

Analog Output Scaling
The DGRA’s analog outputs (0-10 V, 4-20 mA) must be scaled to match the recorder’s input range. If the scaling is wrong, the recorder will log incorrect values. ❗ The DGRA’s analog outputs must be scaled to match the recorder’s input range. Check the recorder’s input specifications.

Jumper Configuration
The DGRA’s analog outputs are configured by jumpers (voltage or current). If the jumpers are set incorrectly, the output won’t match the recorder’s input. ❗ Photograph the old module’s jumper positions before removal. Replicate them on the new module.

Cable Termination
The DGRA’s RS-422 ports require proper termination. ❗ RS-422 requires termination at both ends. The DGRA has a termination jumper—verify it’s set correctly.

D-Sub Connector Damage
The DGRA uses a 37-pin D-sub connector. ❗ Inspect both the cable’s D-sub connector and the module’s connector for bent pins before you mate them.

Get these five right and you’ll cut rework time by 90%.

New Original vs. Refurbished: Why It Matters

The DS3800DGRA is a legacy data recorder interface module. Refurbishment risk is significant.

New Original (New Surplus) means this unit came from GE’s production line, sealed in an ESD-safe bag. It may have been sitting on a shelf for 10-15 years, but it’s never been installed. The analog output drivers are fresh, the serial ports are unused, and the module has zero operating hours. The serial number traces to GE’s production database.

Refurbished risk: The analog output drivers and serial port drivers are the biggest issues. A refurbished DGRA may have been pulled from a decommissioned turbine with 50,000+ hours on it. I saw a refurbished DGRA in a plant that lost analog output on channel 3 after 4 months—the driver had failed. The refurbished module cost 900; the new surplus unit was 1,200. The data recorder lost one of its inputs.

Real cost: A loss of data recorder input can affect trend analysis and maintenance planning. A new surplus module is cheap insurance.

What we provide: We include a photo of the OEM packing slip. The anti-static bag is sealed with a tamper-evident label. The QC test report lists the serial test, the analog output test, and the isolation measurements. You get a 12-month warranty.

Pricing context: Our price sits 30-50% above refurbished alternatives but 20-40% below GE’s current factory list price.

Performance Benchmarks & Test Results

Measured during our QC test. Conditions: test rack with a Mark IV backplane simulator and a CXCIA CPU module, test data recorder connected via RS-232, 24.0 VDC supply (Fluke 8845A), ambient 24 °C.

• Serial Port Test (RS-232): Successfully communicated at 9600, 19200, and 38400 baud. No bit errors.
• Serial Port Test (RS-422): Successfully communicated at 9600, 19200, and 38400 baud. No bit errors.
• Analog Output Test (0-10 V): All 8 channels output the correct voltage within ±0.1 V. Range: 0-10.0 V verified.
• Analog Output Test (4-20 mA): All 8 channels output the correct current within ±0.1 mA. Range: 4.00-20.00 mA verified.
• Data Formatting Test: All 32 analog and 64 digital channels transmitted correctly.
• Power Draw: 2.5 W at idle. 3.0 W at full load. Within the 3.5 W max spec.
• Isolation Resistance (Data Recorder Interface to Backplane): Measured 40 MΩ at 500 VDC—well above the 10 MΩ minimum.
• MTBF (Published): GE’s datasheet listed 195,000 hours at 40 °C for the DGRA. Based on field data, expect 15-20 years of service under normal conditions.

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