DS3800HCVA1H1G | OEM GE Turbine Vibration Input Module

Description

Product Introduction

The DS3800HCVA1H1G is the most ruggedized variant in the HCVA line—it combines the 50-pin military-spec connector (1H) with the heavy-duty 2.5A fusing (1G) and enhanced ESD protection. This board was designed for the harshest vibration monitoring applications: naval propulsion, aerospace test cells, and high-shock industrial turbines. The 50-pin connector provides a secure, locking interface that can withstand shock and vibration far beyond the standard terminal block variants. The 2.5A fuses give you the headroom for high-inrush sensors and long cable runs.

The 1H1G variant typically comes with a conformal-coated PCB and a breakout board (optional) for field wiring. The breakout board uses the same locking spring-cage terminals we’ve seen on the 1F variants, but the main board itself uses only the 50-pin connector. This means you can wire sensors to the breakout board and then plug the cable into the main board—or you can use a custom cable harness with the 50-pin connector directly. The board’s extended temperature range (-20°C to 65°C) and conformal coating make it suitable for outdoor enclosures and un-conditioned spaces. If your plant has a history of vibration sensor failures due to connector issues, the 1H1G is worth considering.

Key Technical Specifications

Compatible Replacement Models

Frequently Asked Questions (FAQ)

Q: What’s the difference between the 1H1G and the 1H1F?
A: The 1H1F uses 1A fuses, while the 1H1G uses 2.5A fuses. The 2.5A fuses are better for high-inrush sensors and long cable runs. The 1H1G also comes with conformal coating as standard, while the 1H1F may not. The connector, bandwidth, and ESD protection are the same. If you need the highest level of protection and fuse headroom, the 1H1G is the better choice.

Q: Does the 1H1G include a breakout board?
A: Not always. Some 1H1G variants ship with a breakout board, others don’t. If the breakout board is included, it will have the same locking spring-cage terminals as the 1F variant. If not, you’ll need to order it separately or build a custom cable harness. Check with your supplier—the breakout board is often sold separately. If you’re buying surplus, verify what’s included. We’ve seen customers receive only the main board and have to scramble to find the breakout board.

Q: Can I use the 1H1G without the breakout board?
A: Yes, but you’ll need to terminate your sensor cables to a 50-pin connector. This requires a custom cable harness with the correct pin assignments. If you’re not set up for that, the breakout board is much easier. The breakout board converts the 50-pin connector to individual terminals, so you can wire sensors with standard tools. If you’re comfortable with crimping and pin insertion, you can build your own harness, but we’ve seen many field failures from poorly made harnesses. We recommend using the breakout board.

Q: The 50-pin connector is military-spec. What does that mean for reliability?
A: The DIN 41612 connector is designed for high-reliability applications, with a rated mating cycle of 500+ connections and resistance to shock and vibration. It’s also keyed, so you can’t insert it incorrectly. This is a major upgrade over standard terminal blocks, which can loosen over time. In high-vibration environments, the 50-pin connector is far more reliable. The only downside is that it’s more expensive and less common in standard industrial cabinets.

Q: I’m installing the 1H1G in a high-humidity environment. Does the connector need special sealing?
A: The connector itself is not sealed—it’s a pin-and-socket design. If you’re in a high-humidity or corrosive environment, you should use a conformal-coated board (which the 1G suffix provides) and consider sealing the connector with a dielectric grease or using a sealed cable gland at the cabinet entry. The connector is robust, but it’s not waterproof. If moisture gets into the connector, you can get signal leakage or corrosion. We’ve seen this in offshore installations—the connector pins tarnish over time. Regular inspection and cleaning are recommended.

Q: How do I test the 1H1G’s sensor power supply?
A: The 1H1G’s 4mA constant current source for IEPE accelerometers is powered from the 24V field supply. You can measure the voltage at the sensor terminals with a multimeter—it should be about 24V (open circuit) and drop to 12-18V when a sensor is connected, depending on the sensor. If the voltage is zero, check the 2.5A fuses. We’ve found that the most common failure point on these boards is the fuse, not the sensor power circuit itself. Always check the fuses before suspecting the board.

Q: Can I mix the 1H1G with other HCVA variants in the same Mark V rack?
A: Yes. The 1H1G is software-compatible with all HCVA variants. The backplane interface and signal protocol are identical. You can have a 1H1G in slot 1 and a 1F1G in slot 2—the Mark V controller will treat them the same. The only difference is the physical wiring interface. No software changes are required. This makes the 1H1G a drop-in replacement for any HCVA slot, as long as you can accommodate the wiring differences.

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