LEFOO · DIFFERENTIAL PRESSURE TRANSMITTERS

LEFOO LFM77 Explosion-Proof Differential Pressure Transmitter

LEFOO LFM77 — manufacturer product photograph — LEFOO LFM77 · Official manufacturer image and specifications

Official LEFOO LFM77 dimension drawing — Official manufacturer dimensional drawing for LFM77. This is a technical drawing, not a photographic product image.

Differential-pressure transmitter for HVAC and industrial hazardous environments; approximately ±100 Pa to ±10,000 Pa orderable options; analog or RS485 outputs.

Manufacturer: LEFOO

EX-PROOF / HAZARDOUS AREA — MANUFACTURER-DECLARED

Ex d IIC T6 Gb (manufacturer page); verify valid certificate.

Verify current original certificate, exact Ex marking, ambient limits, entity parameters, hazardous-area zone and order code before specifying a device. AirAlign does not certify equipment.

Document-type verification — not an ATEX certificate: The maker-hosted TÜV SÜD LFM76 / LFM77 / LFS71 / LFS72 certificate E8A 108521 0018 Rev. 00 is explicitly a voluntary 2014/30/EU electromagnetic-compatibility attestation against EN IEC 61000-6-1/-6-3. It is not an ATEX / IECEx approval, and the maker file itself says it does not replace the EU declaration of conformity. Although LEFOO markets this product as explosion-proof and shows Ex d IIC T6 Gb, an original, current Ex certificate with exact model/range/output, notified body and annex has not been verified. Confirm the actual delivered marking and approval before hazardous-location deployment.

LFM77 — differential pressure in classified areas

LFM77’s stated ±100 to ±10,000 Pa options can serve duct or process differential measurements, but selecting the correct low differential range does not establish safe operation at high process static pressure. LEFOO’s published EMC certificate cannot substitute for Ex d IIC T6 approval documentation. Check the exact model nameplate, approved electronics, probe connections and current relevant certificate, then commission high/low tube routing and controller output scaling.

LFM77 — low DP and classified-area evidence

LFM77 is a differential pressure instrument for air/process reference points, with manufacturer options roughly ±100 to ±10,000 Pa. Check the actual measuring cell, high/low ports and allowable static pressure separately. The available common LEFOO LFM76/LFM77 EMC document is not an ATEX or IECEx approval. Before Ex installation, require the model-specific certificate, nameplate, gas group, T-class and approved wiring accessories.

Official Documentation

Open manufacturer technical source →

The official material may cover several option codes. Confirm live availability, output configuration, safety marking and exact variant with the manufacturer.

Manufacturer technical specifications — LFM77

Medium and span	Air or neutral gases; selectable approximately ±100 to ±10,000 Pa
Accuracy	±1.0% FS
Output	Single-output version: 4–20 mA, 0–10 VDC or RS-485 depending on selected unit
Supply	12–30 VDC or 24 VAC ±20% for applicable versions
Enclosure	IP65; host operating temperature −20 to +80 °C
Manufacturer Ex marking	Ex d IIC T6 Gb; independently verify actual certificate and order-code scope

These are model-family values published by LEFOO and are not independent test or safety-certification results. Confirm the precise order code, output, materials and any Ex certificate for the actual supplied variant. Manufacturer model documentation.