DS3800HHTB1D1D | 8-Channel 32-Bit Totalizer Input Board

Description

Product Introduction

The DS3800HHTB1D1D is the totalizer board in the 1D1D configuration—locking spring-cage terminals, 2.5A fusing on both banks, and battery-backed non-volatile memory. This board counts pulses from flow meters and high-frequency sensors with a 32-bit count value that is preserved during power loss. The locking terminals ensure reliable connections in high-vibration environments, and the 2.5A fuses provide headroom for long cable runs. The battery-backed memory ensures that the totalized value is retained for 5+ years, making this board essential for custody transfer and flow totalization applications.

We’ve used the HHTB1D1D in a custody transfer application at a natural gas pipeline station. The battery-backed memory preserved the totalized values through multiple power outages, ensuring accurate billing. The locking terminals prevented intermittent connections caused by pipeline vibration. The 2.5A fuses handled the cable capacitance on the 200-meter runs to the flow meters. The 32-bit count allowed us to accumulate flow over a month-long period without overflow. The board’s performance was flawless.

Key Technical Specifications

Compatible Replacement Models

Frequently Asked Questions (FAQ)

Q: What’s the advantage of the battery-backed memory on the HHTB1D1D?
A: The battery-backed memory preserves the accumulated count value during power loss. This is essential for custody transfer applications where the totalized value must be retained for billing purposes. The battery retains the data for 5+ years under normal conditions. We recommend checking the battery voltage during maintenance intervals and replacing it if it drops below 2.8V.

Q: Why does the HHTB1D1D have 2.5A fuses on both banks?
A: The 2.5A fuses are for applications with long cable runs (over 100 meters) where cable capacitance can cause inrush currents on power-up. The 2.5A rating provides headroom for these inrush currents while still protecting the board from shorts. If you have a mix of short and long cable runs, the 1D1C (mixed 2.5A/1A) might be more appropriate.

Q: What’s the advantage of the locking terminals on the 1D suffix?
A: The locking terminals have a plastic latch that prevents the wire from pulling out under vibration. This is particularly important for totalizer inputs, where intermittent connections can cause missed pulses and totalization errors. The locking mechanism is a simple but effective solution for high-vibration environments.

Q: Can I use the HHTB1D1D for custody transfer flow totalization?
A: Yes, the HHTB1D1D 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 HHTB1D1D?
A: The HHTB1D1D 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 HHTB1D1D?
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 HHTB1D1D have conformal coating?
A: Not by default. The 1D1D suffix indicates locking terminals and 2.5A fusing, not coating. If you need conformal coating for harsh environments, look for a suffix with a “G” (e.g., DS3800HHTB1G1G). The standard HHTB1D1D is suitable for indoor environments. If your plant has high humidity or corrosive conditions, consider a coated variant.

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