The Gefran Model ME1-6-M-B35D-1-4-D 2130X000X00 Melt Pressure Transmitter (Order Code: F007725), engineered and manufactured by Gefran S.p.A. in Provaglio d'Iseo, Italy, is a premier industrial melt pressure sensing instrument designed specifically for high-temperature polymer processing and extrusion applications.

Technical Model Lineage & Direct Replacement Guidance:
The legacy CE1 Series was historically produced at Gefran’s facility in China. The current ME1 Series, produced 100% in Italy, is the direct, premium plug-and-play evolution of the CE1 line. The ME1-6-M-B35D-1-4-D matches the legacy CE1 specifications identically across its 0 - 350 bar pressure span, 4 - 20 mA 2-wire electrical loop, 1/2-20 UNF process mounting thread, and standard 6-pin Bendix connector pinout. Maintenance teams can execute direct drop-in replacements with zero mechanical modification or control system reconfiguration.

Model Code Breakdown & Configuration (ME1-6-M-B35D-1-4-D / F007725):
- ME: Mercury-filled fluid hydraulic transmission system rated for process temperatures up to 400°C (750°F).
- 1: 4 to 20 mA analog current loop output (2-wire loop-powered configuration).
- 6: Standard industrial 6-pin Bendix connector (VPT07A10-6P).
- M: Grade M accuracy rating (±0.5% Full Scale Output).
- B35D: Calibrated pressure measurement range of 0 to 350 bar (0 to 5000 psi).
- 1: Standard 1/2-20 UNF process mounting thread.
- 4: Rigid stem length of 153 mm (6 inches).
- D: Armored flexible capillary stem length of 457 mm (18 inches).
- 2130X000X00: Gefran factory configuration code denoting GTP coated diaphragm and standard 80% internal shunt calibration.

Key Engineering Features & Operational Advantages:
- Hydraulic Capillary Transmission up to 400°C: Utilizes a sealed, low-volume mercury capillary transmission system that isolates the sensitive silicon strain-gauge sensing element in the cooler electronics housing from the intense 400°C process heat at the extruder barrel tip.
- Gefran Tough Protection (GTP) Coated Diaphragm: The wetted diaphragm is machined from high-strength 15-5 PH stainless steel and reinforced with Gefran's proprietary GTP coating. This provides superior resistance to mechanical wear, scratching, and abrasive scouring from mineral fillers, calcium carbonate, and glass-fiber-reinforced resins.
- Noise-Immune 4-20 mA 2-Wire Current Output: The 4-20 mA current loop delivers clean, noise-free telemetry over extended cable runs, unaffected by electromagnetic noise generated by AC motor drives, high-frequency heater bands, or plant equipment.
- On-Board 80% Shunt Calibration (R-Cal): Equipped with an internal 80% calibration circuit. Technicians can short pins E and F on the connector to generate an instantaneous 80% reference signal, allowing rapid transmitter and display verification without applying mechanical pressure.

Target Industrial Sectors & Applications:
- Blown film extrusion for LDPE, LLDPE, HDPE, and multi-layer barrier films.
- Sheet extrusion, twin-wall polycarbonate panel lines, and rigid PVC profile manufacturing.
- Recycling pelletizing extruders and engineering masterbatch compounding lines.
- Synthetic fiber melt spinning (Polyester, Nylon, Polypropylene non-woven fabrics).
- High-pressure plastic injection molding barrels and rubber vulcanization presses.

• Manufacturer: Gefran (Gefran S.p.A.)
• Country of Origin: 100% Italy (Made in Italy)
• Product Line: ME Series Melt Pressure Transmitters
• Full Order Code: ME1-6-M-B35D-1-4-D 2130X000X00
• Factory Part Number / SKU: F007725
• Model Replacement: Direct 100% plug-and-play replacement for legacy model CE1 (Gefran China)
• Sensing Principle: Bonded strain gauge Wheatstone bridge on mercury-filled capillary diaphragm
• Pressure Range: 0 to 350 bar (0 to 5000 psi)
• Output Signal: 4 to 20 mA (2-wire current loop, loop-powered)
• Measurement Accuracy: Class M (±0.5% FSO including non-linearity, hysteresis, and repeatability)
• Internal Calibration: 80% FSO shunt calibration (R-Cal 80%)
• Power Supply Requirements: 10 to 30 VDC
• Maximum Output Load: Rload = (Vsupply - 10) / 0.02 Ohm
• Proof Pressure: 2 x Full Scale (maximum 700 bar)
• Burst Pressure: 6 x Full Scale (maximum 2100 bar)
• Maximum Wetted Diaphragm Temperature: Up to 400°C (750°F)
• Electronics Housing Ambient Temperature: -30°C to +85°C (-22°F to +185°F)
• Thermal Zero Drift at Diaphragm: ≤ 0.02 bar/°C
• Mounting Process Connection: 1/2 - 20 UNF male thread
• Rigid Stem Length: 153 mm (6 inches, code 4)
• Flexible Armor Length: 457 mm (18 inches, code D)
• Diaphragm Metallurgy: 15-5 PH Stainless Steel with wear-resistant GTP (Gefran Tough Protection) coating
• Electrical Connector: 6-pin male bayonet connector (VPT07A10-6P / PC06A-10-6P)
• 6-Pin Wiring Assignment:
  - Pin A: Positive Supply (+Supply)
  - Pin B: Negative Supply / Signal (-Supply / -Signal)
  - Pin C: Not connected
  - Pin D: Not connected
  - Pin E: Calibration signal (CAL)
  - Pin F: Calibration signal (CAL)
• Ingress Protection Rating: IP65 conforming to EN 60529
• International Certifications: CE marked, RoHS compliant, cULus Listed, EMC Directive compliant.