SENSYCAL FCU400-G | Technical Specifications and Configuration

Description

Product Overview

The ABB SensyCal FCU400-G is a gas flow computer designed to calculate corrected gas volume and support measurement accounting in industrial process installations. Rather than serving as a conventional PLC CPU or a general-purpose DCS input module, it performs dedicated measurement calculations using signals from compatible flowmeters, pressure transmitters, and temperature sensors. These measurements allow the instrument to determine operating volume flow and calculate standardized volume flow under the configured reference conditions. For plants where gas consumption, transfer quantities, or process balances must be tracked, this calculation layer matters as much as the primary flow sensor itself.

Within the SensyCal product family, the FCU400-G is the gas-specific variant, distinct from models intended for steam measurement or other process calculations. Its standard orifice-measurement program supports corrections involving the compressibility factor, flow coefficient, and expansion factor. ABB documentation also describes data logging, billing-date recording, counter retention during power failure, and two pulse outputs. These functions can help preserve measurement records and deliver calculated quantities to downstream equipment. The instrument is configurable through the FCOM200 communication program, so the installed configuration should be checked rather than assumed to match another unit carrying the same base model.

For a DCS system upgrade or legacy gas-measurement replacement, the practical decision is whether the existing sensors, signal ranges, reference conditions, and accounting requirements match the FCU400-G configuration. Verify the supply voltage, installed options, wiring, and communication requirements before connecting a replacement. PROFIBUS integration is documented through a gateway, while the available interfaces depend on the configuration. The FCU400-G is therefore best evaluated as a dedicated gas-measurement instrument within a larger control and monitoring system—not as a drop-in substitute for an unrelated PLC or DCS module.

Product Introduction (Non-Templated)

Incorrect pressure or temperature compensation can make a gas-flow total unreliable even when the primary flowmeter appears to operate normally. The ABB SensyCal FCU400-G calculates corrected gas volume from compatible flow, pressure, and temperature signals, with standard-program support for applicable orifice corrections.

Its documented functions include two pulse outputs and logging of up to 19 operating variables over 200 periods. For a legacy replacement, confirm the original configuration and reference conditions before commissioning.

Key Technical Specifications

Sources: ABB product information and SensyCal documentation. Optional interfaces, power supply, and configured functions should not be inferred from the base model alone.

SENSYCAL FCU400-G

Related Products

The following models belong to the SensyCal measurement family or support the surrounding measurement system. They are not all direct replacements for the .

1. FCU400-S — Steam and saturated-steam measurement computer. Intended for steam flow and heat calculations, rather than the ‘s gas-measurement application.

2. FCU400-P — Process measurement computer for functions such as signal summation, subtraction, and differential-temperature measurement. Consider it when the application centers on combining process signals rather than gas accounting.

3. FCU400-IR — Infrared temperature-monitoring variant for applications such as monitoring electrical switchgear hot spots. Its sensing purpose differs substantially from gas-flow calculation.

4. FCU200-W — Water, cooling-water, brine, and other liquid-related caloric measurement applications. It is relevant to liquid measurement systems, not a like-for-like gas-computer substitute.

5. FCU200-T — Counting and accounting variant with current-to-pulse or pulse-to-current conversion options. Its suitability depends on the required signal-conversion function.

6. BC100 BusCon — PROFIBUS connection accessory documented for FCU200/400 SensyCal equipment. Check the required register mapping and gateway configuration before integrating it into a control network.

7. FCOM200 — Configuration software used to configure the . Access to the correct configuration and parameter set is important when commissioning a replacement.

8. Compatible pressure transmitter — Supplies the pressure measurement required by the configured gas-flow calculation. Verify output type, signal range, scaling, and pressure reference before substitution.

9. Pt100 temperature sensor — Provides temperature measurement for configurations that accept direct Pt100 input. A transmitter-based temperature input requires matching electrical and scaling settings.

10. Compatible gas flowmeter — Supplies the primary flow signal through pulse, frequency, or mA output. The replacement meter must match the input configuration and the site’s measurement method.

Frequently Asked Questions (FAQ)

1. Can I replace an existing with another without changing the wiring?

Not automatically. The base model identifies the gas-measurement variant, but the complete ordering code determines important details such as power supply, input/output options, and configuration.

Before installation:

• Compare both units’ nameplates and terminal assignments.
• Confirm supply voltage and signal types.
• Verify gas reference conditions, engineering units, and correction parameters.
• Test pulse outputs and any connected communication gateway.

A matching base model is a useful starting point, not proof of electrical or functional compatibility.

2. Does the ABB support firmware v3.1?

Firmware compatibility must be verified against the actual hardware revision and applicable documentation. The available product information identifies the and its FCOM200 configuration method, but does not establish a confirmed firmware v3.1 compatibility statement.

Request the installed software or firmware identification, applicable manual revision, and configuration-software requirements before planning an upgrade. Do not assume that a software version used by another SensyCal variant applies to this unit.

3. Can I hot-swap this unit while the gas measurement system is running?

Do not assume that live replacement is permitted. The is a measurement computer, and disconnecting its power or signal wiring can interrupt measurement, pulse outputs, communications, or accounting records.

For a planned replacement, review the process’s measurement continuity requirements, arrange an approved isolation procedure, and preserve the existing configuration and counter records where possible. If continuous gas accounting is mandatory, establish an approved backup measurement method before removing the unit.

4. Will replacing the erase my existing configuration or gas-flow calculation parameters?

The replacement unit should be treated as requiring configuration verification.

The can be configured using FCOM200, and two units with the same base model may have different application settings. Before removing the installed device, document or back up the available configuration, including:

• Flowmeter scaling and input type.
• Pressure and temperature ranges.
• Standard pressure and temperature.
• Gas compressibility and applicable orifice correction parameters.
• Pulse output assignments and counter settings.

After installation, compare the replacement’s settings with the approved baseline and validate the calculated flow against a known reference.

5. How can I verify that an sold as new surplus is authentic?

A new-surplus description is a condition claim, not proof of factory origin or functional status.

Use this inspection sequence:

1. Identity: Compare the model, complete ordering code, serial number, and nameplate with the purchase documentation.
2. Physical condition: Inspect the enclosure, terminals, connectors, and evidence of prior installation.
3. Configuration: Check installed options and available configuration records.
4. Functional testing: Verify power-up, input processing, displayed variables, counter behavior, and pulse outputs using an appropriate test setup.
5. Documentation: Request clear photographs, a test report, and traceable condition records.

Factory packaging alone does not establish that the device works or retains its original configuration.

6. What warranty should I expect when purchasing an replacement?

Warranty coverage depends on the supplier’s written terms and the unit’s actual condition. Do not assume that a new-surplus or unused device carries the same manufacturer warranty as a newly purchased unit supplied through an authorized channel.

Before ordering, obtain written confirmation of the warranty period, coverage for functional failure, return or replacement procedures, and any exclusions for installation errors or application incompatibility. Ask whether the unit has been functionally tested and whether the test results will accompany the shipment.

7. Can the communicate directly with a PLC or DCS over PROFIBUS?

Not every installation supports a direct connection. The product documentation describes PROFIBUS integration through a gateway, including the BC100 BusCon arrangement for the FCU200/400 family.

For a PLC or DCS integration, confirm the gateway hardware, communication settings, register mapping, data types, and update requirements. Test the transmitted flow values, pressure, temperature, and counters against the local display before putting the measurement into service.

Procurement note: The ‘s application and primary functions are documented, but its exact power supply, installed options, current condition, and firmware revision remain unverified. These items should be confirmed before publishing a guaranteed compatibility statement or accepting the unit for a critical gas-accounting application.