Martel Electronics EL-USB-2 User Manual

EL-USB-2

Humidity, Temperature and Dew Point USB Data Logger

This data logger measures and stores up to 16,382 relative humidity and 16,382 temperature readings over 0 to
100%RH and -35 to +80°C(-31 to +176°F) measurement ranges. The user can easily set up the logging rate and start­time, and download the stored data by plugging the module straight into a PC's USB port and running the purpose
designed software under Windows 98, 2000 or XP. Relative humidity, temperature and dew point (the temperature at
which water vapor present in the air begins to condense) data can then be graphed, printed and exported to other
applications. The data logger is supplied complete with a long-life lithium battery, which can typically allow logging for
a year. Status indication is via flashing red and green LEDs. The logger is protected against ingress from water and dust
to IP67 standard when the plastic cap and seal are fitted.

FEATURES

• 0 to +100%RH Measurement Range

• -35 to +80°C (-31 to +176°F) Measurement Range

• Dew point indication via Windows Control Software

• USB Interface for Set-up and Data Download

• User-Programmable Alarm Thresholds for %RH & T

• Status Indication via Red and Green LEDs

• Supplied with Replaceable Internal Lithium Battery
and Windows Control Software

• Environmental Protection to IP67

°C/°F

%RH

WINDOWS CONTROL SOFTWARE

Easy to install and use, the control software runs under Windows 98, 2000 and XP (Home and Professional Editions). It
allows the user to set up and download any EL-USB-2. The latest version of the control software may be downloaded
from .www.lascarelectronics.com

DATA LOGGER SET-UPS

• Logger Name

• °C, °F

• Logging Rate (10s, 1m, 5m, 30m, 1hr, 6hr, 12hr)

• High and Low Alarms for Humidity and Temperature

• Start Date and Start Time

ORDERING INFORMATION

Stock Number

Standard Data Logger EL-USB-2

(Data Logger, Software on CD
and Battery)

Replacement Battery BAT 3V6

SPECIFICATIONS

Specification Min. Typ. Max. Unit

Relative Measurement range 0 100 %RH
Humidity Repeatability (short term) 0.2 %RH

Accuracy (overall error) (20-80%RH) 3.5** %RH
Response time 5 sec
Long term stability 1

Temperature Measurement range -35 (-31) +80 (176) °C (°F)

Repeatability
Accuracy (overall error)

Response time
Dew Point Accuracy (overall error) (25°C, 40-100%RH) 2 ( 4)*** °C (°F)
Logging rate every 10s every 12hr ­Operating temperature range -35 (-31) +80 (176) °C (°F)
1/2AA 3.6V Lithium Battery Life* 1 Year

* Depending on sample rate, ambient temperature and use of alarm LEDs
** This specifies the overall error in the logged readings, for relative humidity measurements between 20 and 80%RH.
*** This specifies the overall error in the calculated dew point, for relative humidity measurements between 40 and 100%RH at 25°C.
See page 4 of this datasheet for accuracy graphs.

+

+

%RH/Yr

0.2 ( 0.4) °C (°F)

++

1 ( 2) 2.5 ( 5) °C (°F)

++ + +

20 sec

++

Martel Electronics Corporation Tel: [phone]
PO Box 770 Email: [e-mail]
Londonderry, NH 03053 USA Web: www.martelcorp.com

© Copyright 2005 Martel Eectronics Corporation All trademarks are the property of their respective owners. P/N 000000000 Rev. x

EL-USB-2

Humidity, Temperature and Dewpoint USB Data Logger

LED FLASHING MODES

EL-USB-2 features 2 bi-colour LEDs, one LED represents temperature measurement, the other represents RH. Each is clearly
marked on the logger. To save power, the status indication alternates between the two channels every 10 seconds. So first you
will see the status of the temperature logging and 10 seconds later you will see the status of the RH logging and so on.

1.

TRH

10 seconds later

TRH

2. The number of flashes and colours indicate :

(Single flash) The channel is logging, no alarm

(Double flash) Delayed start

(Triple flash) Logger full, no alarm

(Single flash) The channel is logging, low alarm

(Double flash) The channel is logging, high alarm

(Triple flash) Logger full, alarm

2 Martel Electronics Corporation DT-EL-USB2