Keller LEX1 (400bar) Digital Precision Manometer

  • Highly accurate and precise industrial pressure gauge with range up to 400bar
  • Suitable for specialist applications in laboratories and calibration facilities
  • Digital calibration function helps ensure ongoing accuracy
More Info
inc VAT £780.00 ex VAT £650.00
Typically ships in 5-7 working days

Product Details

Keller LEX1 Digital Precision Manometer (400bar)

The Keller LEX1 Digital Precision Manometer is a highly accurate pressure gauge that can be used in calibration facilities, laboratories and specialist industrial applications. It has a measurement range of 0 to 400bar with accuracy of ±0.05% FS and a maximum resolution of 20mbar. It has oil-filled metal housing and a piezoresistive pressure transducer. Pressure measurements are taken via the G ¼” male connector.

Pressure measurements are shown in a number of different units on the Keller LEX1’s clear digital display. It has a min/max recording function and also benefits from a zero function for relative measurement in addition to digital self-calibration with a set zero- and end-point.

Thanks to its RS485 Fischer data connection, the Keller LEX1 can be synchronised with up to 127 other instruments as part of a Keller-Bus protocol monitoring system. Free CCS30 coordination software is available from Keller, but connection to a PC does require a Keller K114A USB Cable Adaptor as an optional extra.

With operation conducted using just two buttons, the Keller LEX1 is easy to use and it is well-suited to tricky conditions, as certified by its IP65 ingress protection rating. The battery lasts for 2000 hours.

Keller part number: 303030.0034

Key Features

  • Pressure transducer in oil-filled casing
  • Absolute pressure: 0 to 400bar
  • Accuracy: ±0.05% FS
  • Resolution: 20mbar
  • G1/4” male pressure connector
  • Suitable for labs and calibration centres
  • Range of pressure units
  • Digital calibration function
  • Min/max and relative measurements
  • Works as part of Keller-Bus monitoring system
-1 to 3bar
-1 to 30bar
0 to 100bar
0 to 300bar
0 to 400bar
0 to 700bar
0 to 1000bar
Accuracy ±0.5% FS ±0.1% FS ±0.1% FS ±0.1% FS ±0.05% FS ±0.1% ±0.05% FS
(at smallest range)
10mbar 1mbar 1mbar 1mbar 1mbar 1mbar 0.1mbar
Temperature range 0˚C to 50˚C
Temperature accuracy ±1˚C
Intrinsically safe
Peak mode
Pressure connector 7/16" UNF G 1/4" 7/16" UNF G 1/4" G 1/4" G 1/4" G 1/4"
Analogue output
Internal memory
Data port RS485 Binder USB RS485 Fischer RS485 Fischer
Compatible with
Keller-Bus protocol
More Information


  • Absolute pressure range: 0 to 400bar
  • Overpressure: 800bar
  • Resolution: 20mbar
  • Accuracy @ RT (20˚C to 25˚C): ≤±0.05% FS. Nonlinearity (BFSL), pressure hysteresis, non-repeatability, zero point, amplification.
  • Total error band (0˚C to 50˚C): ≤±0.05% FS. Max. deviation within the specified pressure and temperature range.
  • Long-term stability: ±0.1% FS. > 1 bar, per year under reference conditions, yearly recalibration recommended.
  • Long-term stability: ±0.1mbar. ≤ 1 bar, per year under reference conditions, yearly recalibration recommended.
  • Degree of dependency on location: <±1.5mbar. Calibrated in vertical installation position with pressure connection facing downwards.
  • Accuracy of temperature measurement: ±1˚C typ.
  • Pressure range reserve: ±10%

Electrical Data

  • Battery: 3 V, type CR2430. LEX1 Ei only permitted for use in haz- ardous atmospheres when used with the Renata CR2430
  • Battery life: Approx. 2000 hours when used continuously
  • External power supply: 8...28 VDC
  • Overvoltage protection and reverse polarity of external power supply: ± 32 VDC
  • RS485 voltage insulation: -7...+12 VDC
  • GND case insulation: > 10 MΩ @ 50 VDC
  • External interface: RS485 half-duplex
  • Interface measuring rate: 30 measurements per second
  • Electrical connection: Fischer D 103 A054-130
  • CE conformity as per 2014/30/EU (EMC): EN 61000-6-1 to -6-4; EN 61326-1 / EN 61326-2-3

Temperature Range

  • Compensated temperature range: 0...50 °C
  • Media temperature: 0...50 °C
  • Ambient temperature: 0...50 °C
  • Storage temperature: -20...70 °C


  • Dimensions/appearance: See Dimensions & options
  • Number of digits on LC display: 2 rows with 5 digits each
  • Display mode: Pressure + min/max or pressure + temperature
  • Measuring rate: 2 measurements per second
  • Configurable units of pressure: [bar], [mbar], [hPa], [kPa], [MPa], [PSI], [mH2O], [cmH2O], [inH2O], [ftH2O], [mmHg], [inHg], [kp/cm2]
  • Additional units of pressure: 5 user-defined units can be configured

Mechanical data

  • Pressure connection: Stainless steel AISI 316L
  • Pressure transducer separating diaphragm: Stainless steel AISI 316L
  • Pressure transducer seal (internal): FKM (Viton® type A)
  • Pressure connection seal (external): FKM (Viton® type A)
  • Display housing: Faradex AS-1003
  • Oil filling sensor: Silicone oil
  • Pressure connection: G1/4, see Dimensions & options
  • Diameter x height x depth (approx.): 76 x 118 x 55 mm
  • Weight (approx.): 300 g
  • Protection: IP65
Icon Label Type Size Download
pdf Keller LEX1 Datasheet pdf 1.7 MB Download
  1. Keller Pressure Gauge Case
    Keller Pressure Gauge Case SKU: KELLCASE
    inc VAT £54.00 ex VAT £45.00
  2. Keller G1/4&quot; female to 1/2&quot; male adaptor - SS316L
    Keller G1/4" female to 1/2" male adaptor - SS316L SKU: KELLSS316L
    inc VAT £52.80 ex VAT £44.00
  3. Keller G1/4&quot; female to M20 x 1.5mm male adaptor - SS316L
    Keller G1/4" female to M20 x 1.5mm male adaptor - SS316L SKU: KELLM20SS316L
    inc VAT £52.80 ex VAT £44.00
  4. Keller Low Pressure Calibrator Base
    Keller Low Pressure Calibrator Base SKU: KELLBASE
    inc VAT £348.00 ex VAT £290.00
  5. Keller Pressure Gauge Soft Case
    Keller Pressure Gauge Soft Case SKU: KELLSOFTCASE
    inc VAT £18.00 ex VAT £15.00
  6. Keller K114A USB Adaptor with Fischer connector + Software
    Keller K114A USB Adaptor with Fischer connector + Software SKU: KELLK114A
    inc VAT £168.00 ex VAT £140.00