Description
- Model: FET3251COP1B4COH2
- Part Number: D674A906U01
- Brand: ABB (Germany/UK)
- Series: WaterMaster FET325 Series
- Core Function: Electromagnetic Flowmeter Transmitter (Signal Converter)
- Condition: New Surplus (Original factory stock, zero field usage, non-refurbished)
- Type: Remote or Integral Mount Electronic Module
- Key Specs: 100-230V AC | HART Communication | Dual Pulse/Alarm Outputs
- Power Supply: 100 to 230 V AC, 50/60 Hz
- Communication: HART Protocol (Standard)
- Outputs:
- 4 to 20 mA Current Output
- Dual Configurable Pulse/Logic Outputs (Frequency/Alarm/Limit)
- Housing: Aluminum alloy with corrosion-resistant coating
- Display: Integral backlit LCD with “Through-the-Glass” (TTG) capacitive touch control
- Enclosure Rating: IP67 (NEMA 4X)
- Accuracy: 0.4% of rate (when paired with calibrated sensor)
- Data Storage: Infrared (IR) interface and Sensor Memory (SensorMemory technology)
- Diagnostics: Advanced sensor condition monitoring (Empty pipe, electrode fouling, coil integrity)
ABB D674A906U01 FET3251COP1B4COH2
ABB D674A906U01 FET3251COP1B4COH2
ABB D674A906U01 FET3251COP1B4COH2
Installation & Configuration Guide
Phase 1: Pre-Installation (15 Minutes)
⚠️ Safety Protocol:
- Isolate the main power line (100-230V AC) before opening the transmitter housing.
- Ensure the remote sensor (if applicable) is properly grounded. Electromagnetic flowmeters are highly sensitive to “stray” pipe currents.
- Verify the FET3251 model suffix (COP1B4…) matches your specific output and hazardous area requirements.
Phase 2: Mounting & Wiring (20 Minutes)
- Mounting: Secure the transmitter to the wall bracket or integral sensor mount. Ensure the display is oriented for easy viewing.
- Power Wiring: Connect Line (L), Neutral (N), and Earth (PE) to the designated terminals.
- Signal Wiring: – Connect the 4-20mA loop to Terminals 31 (+) and 32 (-).
- Connect the sensor cable (if remote) ensuring the shields are correctly landed to prevent signal noise.
Phase 3: Configuration (TTG Interface) (15 Minutes)
- Wake-Up: Tap the glass near the optical sensors to activate the menu.
- Easy Setup: Use the “Easy Setup” menu to quickly define:
- Language: English
- Units: m³/h, USGPM, etc.
- Qmax: Full-scale flow value.
- Damping: Adjust for turbulent flow (usually 3-5 seconds).
- Calibration: If this is a replacement module, you must enter the Sensor Span and Zero values found on the sensor’s physical nameplate.
Phase 4: Validation (15 Minutes)
- Simulation Mode: Use the internal diagnostics to simulate a 50% flow rate. Verify that the PLC/DCS receives the correct 12mA signal.
- Zero Check: Perform a “Low Flow Cut-off” check to ensure the meter reads 0.00 when the pipe is full but stationary.
- Status Check: Confirm the “Checkmark” icon is visible, indicating no active hardware or sensor faults.
Customer Cases & Industry Applications
Case 1: Municipal Water Treatment Emergency A municipal water plant in the UK suffered a lightning strike that fried the electronics of a critical effluent flowmeter. Without accurate flow data, they were in violation of environmental discharge permits. We provided a New Surplus FET3251COP1B4COH2 via next-day air. In my experience, the WaterMaster series is incredibly robust, and by simply swapping the transmitter and entering the existing sensor data, the plant was back in compliance within 24 hours.
Case 2: Industrial Cooling Tower Optimization A large data center used WaterMaster meters to manage their cooling water makeup. They needed to add HART communication to their legacy meters for remote monitoring. By upgrading to our FET3251 modules, they gained 0.4% accuracy and full diagnostic visibility into their cooling loops, allowing them to predict electrode fouling before it caused a system shutdown.
Frequently Asked Questions (FAQ)
Q: Can I use this 100-230V AC module to replace a 24V DC unit? A: No. You must match the power supply of your existing installation. If your wiring is 24V DC, this AC module will not work and may damage your power supply. Check the label on your old unit carefully.
Q: What is “Through-the-Glass” (TTG) control? A: It is a patented ABB feature that allows you to operate the menu without opening the housing. This is a huge advantage in humid or rainy environments because it keeps the electronics sealed and dry while you adjust settings.
Q: Does this module require a separate “Sensor Memory” chip? A: The WaterMaster system stores calibration data in a small chip located in the sensor terminal box. When you plug in this new FET3251, it should automatically upload the sensor’s calibration data. If it doesn’t, you can manually enter the values from the sensor tag.
Q: Is “New Surplus” as good as “New from Factory”? A: For flow electronics, yes. These units are often “project leftovers”—parts bought for a site that were never installed. They are original ABB factory builds. We bench-test every D674A906U01 using an ABB simulator to ensure the 4-20mA and pulse outputs are perfectly calibrated before we ship.
Q: How do I handle a “Empty Pipe” alarm after installation? A: First, ensure the pipe is actually full. If it is, this alarm usually indicates a grounding issue. Ensure the grounding rings (if used) are making good contact with the fluid. You can also adjust the “Empty Pipe Detection” threshold in the Advanced Diagnostics menu.
