High-Temperature NaK Measurement Technology

The Gefran K31-6-M-P05M-1-4-D-H 2130X000X00 is a K3-series melt pressure transducer using sodium-potassium alloy, commonly identified as NaK, for hydraulic pressure transmission. The exact Gefran ordering number is F073065.

This model measures pressure from 0 to 5000 psi and provides a 3.33 mV/V output. The K3 platform is intended for higher-temperature engineered-polymer applications where the process temperature can exceed the capability of conventional oil-filled designs.

Verified Specifications

Temperature and Material Verification

The higher published process-temperature capability does not mean every component of the installation may operate at 538°C. Confirm housing temperature, stem heat transfer, capillary routing, diaphragm material, polymer chemistry and machine operating cycle. The H option code should be verified against the applicable Gefran configuration documentation rather than interpreted from appearance.

Installation Requirements

Prepare the mounting hole to the correct depth and thread specification. Prevent the diaphragm from contacting the bottom of the hole or hardened process residue. Route and support the flexible capillary so that vibration, sharp bending and mechanical abrasion are minimized.

Electrical Connection

The K31 supplies a low-level strain-gauge signal. Verify bridge excitation, connector pinout, shielding, controller sensitivity and full-scale calibration. The sensor cannot be connected directly to an input configured exclusively for 4–20 mA without an appropriate signal-conditioning interface.

Differences from M3 and W3

M31-6-M-P05M-1-4-D F008650 has the same nominal pressure range but uses mercury filling and has a lower published maximum process temperature. W31 oil-filled models use FDA-compatible diathermic oil and are intended for a different temperature range. Filling medium and diaphragm option are selection-critical characteristics.

Maintenance and Replacement Notes

Confirm F073065, P05M pressure range, D flexible length, H diaphragm option and the complete 2130X000X00 code. Do not open, cut or attempt to repair the filled stem or capillary. A damaged unit must be handled in accordance with the applicable industrial and material-safety procedure.

Related models are provided for family reference only and are not automatically interchangeable.

Inquiry and Supply Notes

Provide the complete nameplate, process temperature, polymer type and photographs of the sensing tip and capillary. Suggested internal-link anchor text is “Gefran K3 NaK High-Temperature Melt Pressure Transducers." Calibration documentation and product condition require confirmation before supply.