relative pressure transmitter / absolute / vacuum / membrane
4LD...9LD Series



  • Pressure type:

    relative, absolute, vacuum

  • Technology:

    membrane, piezoresistive

  • Output signal:


  • Mounting:


  • Other characteristics:

    with long-term stability, stainless steel, compact, for liquids and gases, precision, OEM, temperature-compensated, fully-welded, with diaphragm seal, miniature, oil-filled, with temperature sensor, EMC-shielded, rugged, for OEM

  • Process temperature:

    Min.: -40 °C (-40 °F)

    Max.: 110 °C (230 °F)

  • Pressure range:

    Min.: 1 bar (14.5 psi)

    Max.: 1,000 bar (14,503.77 psi)


With the D-line, Keller introduces a unique combination consisting of an exceedingly robust
industrial pressure transducer and the popular I2C microcontroller interface. Pressure transmitters with this interface are commonly available only in consumer market housings made of plastic or ceramic, where merely the parameters for compensation are stored in an integrated memory. The D-line OEM transmitters however have an unprecedented embedded digital signal processing (DSP) core for the compensation and normalization of the output values.

The Series 4 LD...9 LD is based on KELLER’s famous Chip-In-Oil (CIO) technology. The “L” stands for the laser welded stainless steel housing and could equally be representative for low- power (typ. 0,1 μA in idle/sleep mode) and low-voltage (Supply: 1,8...3,6 VDC). The housing is hermetically-sealed, oil-filled and builds a Faraday cage with feed-through capacitors around the entire electronics. The digital interface of the electronics with dual information of pressure and temperature is indicated by the “D”.

Other KELLER products

Pressure Transmitters