LEX 1: Highly Precise Digital Manometer
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LEX 1: Highly Precise Digital Manometer - 1

Highly Precise Digital Manometer precision**: 0,01 %fs LEX 1 is a micro-processor controlled, accurate and versatile digital pressure measuring instrument for calibration and testing purposes with 0,05 %FS standard accuracy. Option for precision 0,01% available as extra feature. Via the RS485 Bus Interface, communication with up to 128 connected instrument can take place. The pressure is measured twice per second and displayed. The top display indicates the actual pressure, the bottom display shows the Max.- or Min.-pressure. ATEX / IECEx LEX 1 devices which are marked with “LEX 1 Ei” are intrinsically safe for use in hazardous areas (by approval for both ATEX and IECEx standards). Function LEX 1 has two operating keys. The left key is to turn the instrument on, to select the functions and the pressure units. The right key executes the selected function resp. unit or serves to display the Max.- and Min.-value. LEX 1 with piezo­ resistive pressure sensor The instrument has the following functions RESET With the RESET-function, the Max.- and Min.-value is set to the actual pressure ­value. Using the Zero-function will set any prevailing pressure to be the new zero point reference. The instrument turns off 15 min. after the last key function. Activating CONT (Continuous) deactivates this automatic turn-off. All standard instruments are calibrated in bar. The pressure can be indicated in 13 different units. Scope of Delivery Carrying case and 5-point calibration certificate. Optional Accessories Carrying bag, protective rubber covering, interface converter K-114A LEX 1 with capacitive pressure sensor Standard Pressure Ranges 1 LEX 1 (Ei) piezoresistive Ranges Resolution Display PAA/PR -1…2 bar 0,1 mbar 6 bar PAA/PR -1…10 bar 1 mbar 20 bar PAA/PR -1…20 bar 1 mbar 40 bar PA 0…200 bar 10 mbar 400 bar PA 0…400 bar 20 mbar 800 bar PA 0…700 bar 50 mbar 1100 bar PA 0…1000 bar 100 mbar 1100 bar Accuracy, Error Band (0...50 °C) ≤ 0,05 %FS Long Term Stability Reference: 1 mbar or 0,05 %FS Absolute: 0,5 mbar or 0,025 %FS Optional: Precision 0,01 %FS (only for piezoresistive PA or PAA and ranges ≥ 10 bar) Standard Pressure Ranges 1 LEX 1 (Ei) capacitive Ranges Resolution Display Overpressure Neg. Overpressure PR/PD 2 30 mbar 0,01 mbar 300 mbar PR/PD 2 100 mbar 0,01 mbar 1000 mbar 2 PR/PD 300 mbar 0,1 mbar 1500 mbar Accuracy, Error Band (0...50 °C) ≤ 0,2 %FS Long Term Stability FS ≥ 100 mbar: ± 0,1 %FS FS ≤ 100 mbar: ± 0,1 mbar Other pressure ranges as well as instruments with relative pressure measuring cells, on request For the PD version, a tube connection Ø 6 mm for the reference is available PR = Vented Gauge. Zero at atmospheric pressure PA = Absolute. Zero at atmospheric pressure PAA = Absolute. Zero at vacuum PD = Differential. 1 2 30 mbar 100 mbar 300 mbar Intrinsically Safe Version, 94/9/CE and IECEx Classification: II 2 G Ex ia IIC T6 Gb Certifications File: PTB 05 ATEX 2012 X and IECEx PTB 13.0028X In comparision to the standard LEX1 the Ex-proof intrinsically safe version has internally more enhanced protective components mounted and is marked with the EX-logo. Functions, ranges and accuracy are identical to the standard LEX 1 version. The factory setting of the zero for the ranges ≤ 61 bar absolute is at vacuum (0 bar absolute). For relative pressure measurements, activate “ZERO SEt” at ambient pressure. Instruments > 61 bar absolute or instruments with a relative pressure sensor (label marked with: Range: rel) are calibrated with the zero at atmospheric pressure. KELLER Ges. für Druckmesstechnik mbH Companies approved to ISO 9001

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LEX 1: Highly Precise Digital Manometer - 2

KELLER Specifications Number of Digits of the LCD Display Measuring Rate (Display LCD) Measuring Rate via Serial Interface Storage- / Operating Temperature Medium Temperature Pressure Sensor Compensated Temperature Range Battery Battery Life Pressure Connection Bus Interface 3 Electrical Connection 3 External Supply 3 Temperature Measurement Material in Contact with Media 5 digit 2 x per second Pressure up to 15 x per second -10…60 °C / 0…50 °C -20…80 °C, others on request LEX 1 Ei max. 60 °C 0…50 °C 3 V battery, Typ CR 2430 approx. 2’000 hours continuous operation G1/4” (other threads on...

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