LEM Ruska Laboratory Environment Monitor Fluke 2456 Data Sheet Brochure
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User Manual: Fluke-2456-LEM-Laboratory-Environment-Monitor-Data-Sheet-Brochure
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Technical Data
LEM
Ruska Laboratory
Environment Monitor
Features
• Monitors barometric pressure,
temperature, humidity, and air density
• Communicates via RS-232 or RS-485
• Includes software to display all
parameters in addition to data logging
and calibration
• Precision to 0.1 °C, 0.04 inHg
(1.3 mbar) and 3 % RH
• Ideal for calibration labs, clean rooms,
storage facilities or use with Ruska
piston gauges
• Replaces mechanical strip chart
recorders
The Laboratory Environment
Monitor (LEM) provides the
ability to measure barometric
pressure, ambient temperature,
relative humidity and air den-
sity. The LEM transmits these
measurements via an RS-232 or
RS-485 interface to a PC. The
supplied software can then be
used to monitor and log all the
above parameters for one or up
to eight LEMs, simultaneously.
The supplied software
allows the LEM to be used as
a stand alone instrument and
performs a variety of functions,
including various units selec-
tion, as well as as well as data
logging. The LEM is an ideal
replacement to older data log-
gers, such as mechanical strip
chart recorders. The software
includes options for logging in
intervals of one minute, five
minutes or 15 minutes. The
space delimited text file keeps
file sizes small, while allowing
easy insertion into spreadsheet
applications for data analysis
and graphing. The LEM also
provides air density measure-
ment—a critical factor for mass
calibration labs to correct for
air buoyancy effects.
Annual recalibration of the
LEM is accomplished through
the supplied software. Once
calibrated, the new coefficients
are downloaded to the LEM and
stored in non-volatile memory.
If a barometric pressure
accuracy better than 0.04 inHg
(1.3 mbar) is required, a variety
of digital barometers with an
RS-232 interface can be directly
connected to the LEM. The LEM
will transmit the barometric
pressure reading from the
external barometer to the PC
and LEM software via a single
communication link.
The LEM is compatible with
a Ruska Model 2456 piston
gauge monitor and WinPrompt®
software, which automates
the operation of the extensive
line of Ruska primary pressure
standards. The LEM allows
WinPrompt to automatically
compensate for air buoyancy
effects on the mass set of the
piston gauge. The LEM is also
compatible with the Model 2465
autofloat gas piston gauge.
Fluke Calibration
PO Box 9090, Everett, WA 98206 U.S.A.
Fluke Europe B.V.
PO Box 1186, 5602 BD
Eindhoven, The Netherlands
For more information call:
In the U.S.A. (800) 443-5853 or
Fax (425) 446-5116
In Europe/M-East/Africa +31 (0) 40 2675 200 or
Fax +31 (0) 40 2675 222
In Canada (800)-36-FLUKE or
Fax (905) 890-6866
From other countries +1 (425) 446-5500 or
Fax +1 (425) 446-5116
Web access: http://www.fluke.com
©2010 Fluke Corporation.
Specifications subject to change without notice.
Printed in U.S.A. 9/2010 3890714A D-EN-N
Modification of this document is not permitted
without written permission from Fluke Corporation.
2 Fluke Calibration LEM Ruska Laboratory Environment Monitor
Fluke Calibration.
Precision, performance, confidence.™
Specications
General specifications
Units Temperature: °F or °C
Pressure: mmHg, cmHg, inHg, kPa, mbar, psi, bar, kg/cm2
Humidity: %RH
Air Density: g/cm3, kg/m3, lb/in3
Power 10 to 36 V dc, 250 mA maximum (supplied with 115/230 ac adapter).
Optional power via RS-485.
Temperature Operating: 18 °C to 28 °C (64 °F to 82 °F)
Storage: -20 °C to 70 °C (-4 °F to 158 °F)
Humidity 5% to 95% RH, non-condensing
Weight 0.23 kg (0.5 lb)
Dimensions (H x W x D) 133.35 mm x 82.55 mm x 31.75 mm (5.25 in x 3.25 in x 1.25 in)
Communications RS-232 or RS-485
Warm up time 30 minutes
Data update One second
Range
Temperature 18 °C to 28 °C (64 °F to 82 °F)
Pressure 20 inHg to 34 inHg (700 mbar to 1150 mbar)
Humidity 5 to 95% RH
Performance
Precision Temperature: ± 0.1°C (32.18 °F)
Pressure: ± 0.04 inHg (1.3 mbar)
Humidity: ± 3 % RH
Precision is defined as the combined effects of linearity, repeatability
and hysteresis.
Total uncertainty Temperature: ± 0.5°C (32.9 °F) per year
Pressure: ± 0.08 inHg (2.7 mbar) per year
Humidity: ± 10% RH per year
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%).
Software Requires Microsoft® Windows® 95 or higher, 1.6 MB of available
hard disk space, 32 MB RAM, RS-232 or RS-485, interface includes
extensive help and system manual includes syntax commands.
LEM with Model 2456 and WinPrompt
