DEIF DLQW72-PC-PY – 72×72 panel-mounted power meter for reliable switchboard and genset measurements

The DEIF DLQW72-PC-PY is a compact 72×72 mm panel meter designed for electrical panels where space is tight but dependable power readings matter. From my experience with DEIF’s panel instrumentation, the DLQW72 series typically handles key electrical quantities on single or three-phase systems and fits neatly into marine, power generation, and industrial switchboards. One thing I appreciate is the straightforward, no-nonsense form factor—most technicians can drop it into a 68×68 mm cut-out and be up and running quickly.

Company’s Order Placement Process and Guarantees

• Warranty period: 365 days
• Delivery time: 1 week when in stock; no more than one month at the latest
• Payment: 50% advance payment; full payment before delivery
• Express delivery: FedEx, UPS, DHL

Key Features

• 72×72 mm panel footprint – Fits standard switchboard cut-outs (approx. 68×68 mm), saving space in dense panels.
• Multi-parameter power measurement – Typically monitors voltage, current, power (W), and related quantities in single or three-phase systems.
• CT/VT adaptable – Works with standard 5 A CTs and common PT/VT ratios for low- and medium-voltage applications.
• Clear digital display – Fast reading of key values; technicians usually get what they need at a glance.
• Alarm or pulse outputs (variant-dependent) – Practical for energy pulses or basic limit alarms in many cases.
• RS-485 Modbus RTU (where fitted) – The “PC” suffix typically indicates a communication/pulse-capable variant, making SCADA tie-in straightforward.
• Panel robustness – Designed for industrial switchboards; seems to be well-suited to genset, marine, and utility panels.

Technical Specifications

Application Fields

You might notice that the DLQW72-PC-PY slots naturally into:

• Genset control panels and auxiliary boards for prime/standby power
• Marine switchboards where 72 mm instruments are standard practice
• Industrial MCCs and OEM machinery panels needing basic power readouts
• Commercial building distribution boards for energy and load snapshots
• Retrofit projects replacing legacy 72×72 analog meters with digital units

Advantages & Value

• Drop-in form factor – Minimizes panel rework; saves installation time and cost.
• Compatibility – Works with common CT/VT ratios, easing integration with existing switchgear.
• Procurement-friendly lead times – Typically quick to source with predictable delivery.
• SCADA-ready – RS-485 Modbus (when present) simplifies data collection without extra gateways.
• Support & continuity – DEIF instrumentation is widely used, which helps with spares and long-term serviceability.

Installation & Maintenance

• Panel conditions – Install in a clean, dry switchboard with adequate ventilation; avoid high vibration and direct heat sources.
• Wiring – Use appropriately rated conductors; maintain CT polarity (P1/P2) and short CT secondaries during commissioning when required.
• RS-485 practices – Twisted, shielded pair; daisy-chain topology; termination at the ends; consistent baud/format across devices.
• Protection – Fit a small auxiliary supply fuse; ensure proper grounding to reduce noise.
• Routine checks – Verify readings against a reference annually; clean the bezel/display; update firmware if applicable to your variant.

From my experience, most issues come from CT ratio mismatch or wiring polarity. A quick validation during startup usually prevents nuisance alarms and misreadings.

Quality & Certifications

• CE conformity and RoHS compliance are typical for this product category
• Manufactured under ISO 9001 quality systems
• UL/cUL availability may depend on the exact variant and region
• Manufacturer’s warranty: 12 months (365 days)

Recommended Supporting Components

To speed up integration, these commonly paired items tend to help:

• 5 A ring-type CTs (e.g., 200/5 A, 400/5 A) – Choose ratios matching feeder currents; accuracy class 0.5 or 1.0 is usually sufficient.
• RS-485 to USB converter (industrial grade) – Useful for laptop commissioning and SCADA diagnostics.
• 72×72 panel sealing gasket – Improves front sealing when panels face dust or humidity.
• Auxiliary supply miniature fuse – 0.5–1 A quick-blow to protect the device’s aux power circuit.
• Shielded twisted pair cable – Ensures stable Modbus communication over longer runs.