® L E M Laboratory Environment Monitor n Monitors barometric pressure, temperature, humidity and air density n Communicates via RS-232 or RS-485 n Includes software to display all parameters in addition to data logging and calibration o n Precision to 0.1 C, 0.04 inHg and 3% RH n Ideal for calibration labs, clean rooms, storage facilities or use with Ruska piston gauges n Replaces mechanical strip chart recorders A Druck Company L E M ® L E M Specifications DESCRIPTION RANGE o The Laboratory Environment Monitor (LEM) provides the ability Temperature: 18 – 28 C to measure barometric pressure, ambient temperature, relative Pressure: 20 – 34 inHg humidity and air density. The LEM transmits these measurements Humidity: 5 – 95% RH via an RS-232 or RS-485 interface to a PC. The supplied software PERFORMANCE can then be used to monitor and log all the above parameters for 1 Precision one, or up to eight LEM’s, simultaneously. o Temperature: ± 0.1 C The supplied software allows the LEM to be used as a stand alone Pressure: ± 0.04 inHg instrument and performs a variety of functions, including various units Humidity: ± 3% RH selection, as well as data logging. The LEM is an ideal replacement 2 Total Uncertainty to older data loggers such as mechanical strip chart recorders. The o Temperature: ± 0.5 C per year software includes options for logging in intervals of 1 minute, 5 Pressure: ± 0.08 inHg per year minutes or 15 minutes. The space delimited text file keeps file sizes Humidity: ± 10% RH per year small, while allowing easy insertion into spreadsheet applications for data analysis and graphing. The LEM also provides air density Warm up time measurement - a critical factor for mass calibration labs to correct 30 minutes for air buoyancy effects. Data update Annual recalibration of the LEM is accomplished through the supplied 1 second software. Once calibrated, the new coefficients are downloaded to SOFTWARE the LEM and stored in non-volatile memory. ® ® Requires Microsoft Windows 95 or higher If a barometric pressure accuracy better than 0.04 inHg is required, a 1.6MB of available hard-disk space, 32MB RAM RS-232 or RS-485 interface variety of digital barometers with an RS-232 interface can be directly Includes extensive help system connected to the LEM. The LEM will transmit the barometric Manual includes syntax commands pressure reading from the external barometer to the PC and LEM software via a single communication link. GENERAL Units o o Temperature: C or F 2 Pressure: mmHg, cmHg, inHg, kPa, mbar, psi, kg/cm Humidity: %RH 3 3 3 Air Density: g/cm , kg/m , lb/in Power 10-36 VDC, 250 mA max. (supplied with 115/230 AC adapter) Optional power via RS-485 Communication RS-232 or RS-485 Temperature o Operating : 18 to 28 C o Storage : -20 to 70 C Humidity The LEM is compatible with Ruska’s Model 2456 Piston Gauge 5% to 95% relative humidity, non-condensing ® Monitor (PGM) and WinPrompt software which automates the Physical operation of Ruska’s extensive line of primary pressure standards. 5.25”h x 3.25”w x 1.25”d, 0.5 lbs ® The LEM allows WinPrompt to automatically compensate for air buoyancy effects on the mass set of the piston gauge. The LEM is 1 Precision is defined as the combined effects of linearity, repeatability also compatible with the Model 2465 Autofloat Gas Piston Gauge. and hysteresis. 2 Expression of accuracy (uncertainty) conforms with the recommendations of the ISO Guide to the Expression of Uncertainty in Measurement and includes RSS of precision, stability, temperature effects, and the calibration standard to 2 sigma (95%). Ruska Instrument Corporation Representative: P.O. Box 630009, Houston, TX 77063-0009 (713) 975-0547 n Fax (713) 975-6338 E-mail: sales@ruska.com n www.ruska.com A Druck Company n www.pressure.com ® Calibration. Automation. Innovation. Due to Ruska Instrument’s process of continuous improvements, © 2002 Ruska Instrument Corporation. Ruska is a trademark and the Ruska logo is a registered Document 0206-lema printed specifications are subject to change without notice. trademark of Ruska Instrument Corporation. All rights reserved.