Pressure Sensor - Industrial - Type KH | Gefran

Gefran KHC Pressure Transmitter

The Gefran KHC is a digital pressure transmitter designed for mobile hydraulics and industrial hydraulic circuits where direct measurement transmission over a CAN network is required. It is available with CANopen DS404 or SAE J1939 output, supporting both pressure and device temperature transmission.

Key Technical Data

• Measuring ranges: 4…1000 bar
• Supply voltage: 8…32 Vdc
• Reference temperature accuracy: < ±0.5% FS
• Sampling rate: 1 ms / 1000 Hz
• Wetted parts: AISI 430F and 17-4 PH
• Housing: AISI 304
• Process/storage temperature: -40…+125 °C
• Ambient temperature: -40…+105 °C
• Protection: IP67 / IP69K with suitable female M12 connector

Industrial Applications

KHC is used in hydraulic power units for construction machinery, agricultural equipment, material handling systems, hydraulic valve blocks, pumps, cylinders, and systems requiring pressure diagnostics via CAN bus. Digital communication reduces the need for analog PLC inputs and allows parameterization of address, transmission rate, and message structure.

Protocol Selection

CANopen DS404 is selected for machines with CANopen architecture, NMT states, PDO/SDO, and LSS parameterization.
SAE J1939 is used in mobile applications, ECU networks, and equipment utilizing PGN/SPN communication structure.

Installation

Grounding is typically achieved through the machine body. Shielded cable is used, with the shield connected to the shell of the 5-pin M12 connector. Power cables should be routed separately from signal cables to minimize interference.

Standards and Compliance

KHC declaration of conformity includes CE, EMC Directive 2014/30/EU, RoHS 2011/65/EU, EN 61326-1, and EN 61326-2-3.

FAQ

Suitable media?
For liquids and gases compatible with AISI 430F and 17-4 PH.

Is analog output available?
Not for KHC. This series is digital output only (CANopen or J1939).

What to check for new projects?
Gefran lists KHC as phase-out; KMC series is recommended as replacement.