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KJLC® 902 Series Piezo Gauges

Note For a direct replacement, please see the new 902B page. Please contact for further details or technical support.

These piezo transducers combine the pressure measurement technology of a piezo transducer with an integrated electronic control circuit.

  • Our KJLC 902 is an absolute direct reading transducer, enabling the measurement to be gas independent
  • Transducer includes a unique temperature compensator which allows for high accuracy over a wide measurement range <1 to 1,000 Torr (<1 to 1,333 mbar)

An LED readout is available for the 902 which is controlled through the 0–10 VDC linear analog output. The readout is streamlined with the width and depth of the transducer, and adds only 1.4" to the height. The readout attaches to the transducer through the D-sub connector and has a through connector to enable the transducer to connect to the rest of the system for integration.


  • Low-cost transducer alternative
  • Compact system design with integrated electronics and sensor in one unit
  • Reduced process cycle time due to the tranducer's fast, accurate, and repeatable pressure measurements
  • Transducer is suitable for harsh processes due to its clean, robust design and stainless steel construction
  • Ease of operation with both digital communication and user- configurable analog output in one unit
    • Digital: RS-485 or RS-232
    • Digital models also have choice of Analog: 0 to 5 or 0–10 VDC
    • Linear
    • Logarithmic
  • Process control from set-point relay with fast response time
  • CE marked


  • Load locks
  • Vacuum processes
  • Foreline and roughing pressure measurement
  • Warning alarm
  • Backfill and venting monitoring
  • Vacuum system control relay

Specifications Table

Measurement MethodPiezo
Measurement Range1-1,000 Torr (1 to 2,000 mbar): ±<1% of reading
Communications InterfaceDigital RS-485 or RS-232, 9-pin, Sub-D
Power Requirements12-30 VDC, 30mA, 0.5W max
Temperature (operating)0-50° C
Temperature (bakeout)85° C
Max. Pressure2,000 Torr (2,666 mbar)
Materials Exposed to Vacuum304 SS, 316 SS
Repeatability (Typical)±0.03% of F.S.
Set-Point Range1-1,000 Torr (1 to 1,333 mbar)
Relay Response50ms (1 SPST resistive relay rated at 1A @ 30 VAC/DC)
Mounting/Installation OrientationAny
Output Voltage0-10 VDC
Product Downloads
Product Downloads
Below is a list of available file downloads for this product.
Product Cross-Reference Inquiry
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Vacuum Gauge Selection Guide
With a variety of gauges to choose from, the Vacuum Gauge Selection Guide is designed to help you find the right gauge to meet your vacuum requirements.
Gauges FAQ
Click here for answers to some of the most common questions we are asked.
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Contact Us - KJLC® 902 Series Piezo Gauges