DS3800HHTB | OEM GE Turbine Totalizer Module

Description

Product Introduction

The DS3800HHTB is the totalizer board for the Mark V—it counts pulses from flow meters and high-frequency sensors with a 32-bit count value and retains the accumulated value even after power loss. The board’s battery-backed non-volatile memory ensures that the totalized value is preserved during power outages, which is essential for custody transfer and flow totalization applications. The 8-channel capacity provides flexibility for multi-channel applications, and the 100kHz input frequency range covers most industrial counting applications. The 24V DC input capability matches modern flow meters and sensors.

We’ve used the HHTB in a custody transfer application where we needed to totalize flow from multiple meters. The battery-backed memory preserved the totalized values through power outages, ensuring accurate billing. The 32-bit count allowed us to accumulate over 4 billion pulses without overflow, and the 100kHz input frequency handled the flow meters’ outputs with margin. The HHTB is the board to choose for applications where preserving the accumulated value is critical.

Key Technical Specifications

Compatible Replacement Models

Frequently Asked Questions (FAQ)

Q: What’s the difference between the HHTB and the HHRB?
A: The HHTB has battery-backed non-volatile memory that preserves the accumulated count during power loss. The HHRB does not have this memory—the count value is lost when power is removed. The HHTB is for applications where the totalized value must be preserved (e.g., custody transfer, flow totalization). The HHRB is for general-purpose counting where preservation is not required.

Q: How long does the battery-backed memory retain the count value?
A: The battery-backed SRAM retains the count value for 5+ years under normal conditions. The battery is a lithium coin cell (typical) that powers the memory when the board is powered off. We recommend checking the battery voltage during maintenance intervals and replacing it if it drops below 2.8V. The board’s status LED will indicate a low battery condition.

Q: Can I use the HHTB for custody transfer flow totalization?
A: Yes, the HHTB is designed for custody transfer applications. The battery-backed memory ensures that the totalized value is preserved during power outages, which is essential for accurate billing. The 32-bit count provides sufficient range for most flow totalization applications. However, custody transfer applications may require additional certification—check your local regulations.

Q: What’s the maximum count value of the HHTB?
A: The HHTB has a 32-bit count, which provides a maximum value of 4,294,967,295 counts. At 100kHz, this would take over 11 hours to overflow. For most industrial applications, this is more than sufficient. If you need longer accumulation periods, you can read the count value periodically and reset it.

Q: How do I read the count value from the HHTB?
A: The count value is read by the Mark V controller via the backplane. The controller reads the 32-bit count value from the board’s registers. The specific register mapping is in GE’s application manual (GEI-100879). You’ll need to configure the Mark V to read the count values from the appropriate registers.

Q: Does the HHTB have conformal coating?
A: Not by default. The HHTB’s suffix typically indicates termination type, not coating. If you need conformal coating for harsh environments, look for a suffix with a “G” (e.g., DS3800HHTB1G1G). The standard HHTB is suitable for indoor environments. If your plant has high humidity or corrosive conditions, consider a coated variant.

Q: The HHTB has a 0.9A backplane current draw. Is that typical?
A: Yes, the 0.9A draw is typical for totalizer input boards. The Mark V power supply is rated at 6A on the 5V rail, so the HHTB is within the limit. If your rack has multiple HHTB boards, check your total backplane current. We recommend keeping total backplane current below 5.5A for margin.

GE DS200TCQAF1BBK
GE DS200TCQAF1BBL
GE DS200TCQAG1A
GE DS200TCQAG1AFC