DEIF TAC-311DG | Single-Function AC Current Transducer

Description

3. Key Technical Specifications

The TAC-311DG is a single-function AC current transducer. It measures sinusoidal AC current and converts the measured value into a proportional DC signal that can be used by PLCs, PCs, indicators, alarms, and other control equipment. DEIF specifies Class 0.5 accuracy and a 45–65 Hz operating frequency range.

A key procurement detail is the configuration. TAC-311DG units can differ by measuring current, output range, and auxiliary supply. The standard output can be 4–20 mA DC, while other configured output ranges are available. Do not order based on TAC-311DG alone when the original unit’s rating label is available.

4. Product Introduction (Anti-Template)

When an AC measurement has to be transferred reliably into a control system, the DEIF TAC-311DG provides the conversion stage between the electrical measurement circuit and the low-level analog input. It is designed for sinusoidal AC current measurement and produces a proportional DC output suitable for PLCs, monitoring instruments, indicators, and alarm systems.

The small housing can make this device look straightforward, but configuration matters more than appearance. Measuring range, output signal, auxiliary supply, and wiring arrangement must match the existing installation. Honestly, a TAC-311DG with the wrong input range can look perfectly healthy while sending the wrong value to the control system.

5. QC, Procurement & Logistics SOP

1. Inbound Verification
   Verify the complete TAC-311DG model and inspect the nameplate for measuring current, output range, auxiliary supply, order number, and serial information. DEIF documentation shows multiple ordering configurations, so the suffix and electrical rating should be confirmed before shipment.
2. Live Rig Testing
   Where suitable test equipment is available, verify the auxiliary supply, AC current input, output signal, zero point, span response, and indicator behavior. For a 4–20 mA version, test the output across representative points of the configured measuring range.
3. QA & Anti-Static Packaging
   Protect the transducer from mechanical impact and moisture during packing. Terminal areas should be protected against bending or crushing. The unit should be immobilized inside the carton rather than allowed to move freely during transportation.
4. Global Logistics & Export Compliance
   Export documentation should identify the product as a DEIF TAC-311DG AC Current Transducer and include the actual configured electrical specification. HS classification should be checked against the declared function and destination customs requirements. For urgent control-system replacement, air freight is normally the practical choice; sea freight can be used for planned consolidated cargo.

6. Technical Pitfalls & Integration Warnings

1. Input Range Mismatch
   TAC-311DG supports different measuring-current configurations. For example, a unit configured around a 1 A circuit should not be substituted blindly for a 5 A measurement circuit. Verify the original input rating before connecting the replacement.
2. Output Signal Mismatch
   A 4–20 mA output and a 0–10 V output are not interchangeable without checking the receiving instrument. If the PLC analog input expects voltage while the replacement transducer provides current, the measured value will be incorrect even though the transducer itself is functioning normally.
3. Auxiliary Supply Error
   TAC-311DG versions use specified auxiliary supplies, including 110/230/440 V AC configurations and DC supply variants. Applying the wrong auxiliary voltage can damage the transducer. Check the nameplate before energizing.
4. ESD / Wiring During Installation
   Although this is a compact DIN-rail transducer rather than a large control PCB, incorrect wiring can still damage the unit or the connected analog input. Isolate the circuit before installation and verify terminal assignments against the applicable wiring diagram.

7. Frequently Asked Questions (FAQ)

Q1: “What does the DEIF TAC-311DG actually measure?”

It measures sinusoidal AC current and converts that measurement into a proportional DC current or voltage output for monitoring and control equipment.

Q2: What is the standard measuring range?

The TAC-311DG family covers measuring-current configurations from approximately 1.0 to 7.25 A AC, depending on the specific configuration. The exact original unit should be checked before replacement.

Q3: “Does TAC-311DG always output 4–20 mA?”

No. The TAC-311DG can be configured with several output ranges, including 4–20 mA DC, 0–5 mA, 0–10 mA, 0–20 mA, and 0–10 V DC, depending on the ordered version.

Q4: Can I replace TAC-311DG with TAC-321DG?

Not as a blind substitution. The two models have different auxiliary-supply arrangements and measurement configurations. The TAC-321DG is designed without an auxiliary supply, while the TAC-311DG requires an auxiliary supply.

Q5: “Can I hot-swap the TAC-311DG?”

Do not assume it is safe to remove the transducer while the measurement circuit or auxiliary supply is energized. Isolate the relevant AC measurement circuit and auxiliary power before replacement, then verify the wiring before restoring power.

Q6: What is the approximate weight for shipping?

The published product information gives an approximate weight of 0.4 kg for TAC-311DG. The actual gross shipping weight will be higher after protective packaging and the export carton are added.

Q7: What information should I provide when ordering a replacement?

Please provide:

• Existing TAC-311DG nameplate photo
• DEIF order number
• Measuring current/range
• Output signal
• Auxiliary supply voltage
• Wiring or terminal photo
• Quantity required
• Destination country
• Required delivery date

For this model, the order number on the original label is particularly important. The TAC-311DG designation identifies the product family, but the actual electrical configuration determines whether the replacement is suitable.

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