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EL-WIFI-Alert Alarm Indicator

Categories: Unrelated but Interesting Leave a comment

The stand-alone EL-WIFI-Alert alarm indicator is an add-on for EL-WIFI series temperature and humidity data loggers. The EL-WIFI-Alert produces an audible and visual alert when an alarm level on one of your EL-WIFI temperature and humidity data loggers (installed on the same wireless network) is breached.

EL-WIFI-Alert alarm indicator

Multiple EL-WIFI-Alert units can be placed in remote locations, out of sight of the EL-WIFI loggers themselves and your PC, alerting users to alarms that might otherwise get overlooked. With 10 volume settings, 9 alarm sounds and bright, flashing LEDs, the EL-WIFI-Alert is a great compliment to the alerts already visible on your EL-WIFI logger and in the WIFI Sensor Software.


Additional Reading:

Configuring the All-new EL-WIFI-TH Using EasyLog WiFi Software

Cloud-based Device Management for EL-WIFI Data Loggers

4-20 mA Measurement Resolution

Categories: 4-20 mA Current Loop, Data Acquisition, Data Logger, FAQs Leave a comment

Don’t overlook a vital component that affects 4-20 mA measurement success: Measurement resolution.

Measurements from sensors that have a 4-20 mA output are very common. Customers always ask how to connect them to a data logger or data acquisition system, which we describe in detail here. However, they often overlook a vital measurement component that affects their 4-20 mA measurement success: Measurement resolution. This application note presents a table of popular product implementations from DATAQ Instruments and associated resolution values as a quick reference guide.

So, What’s 4-20 mA Measurement Resolution, Anyhow?

Good question! The term “measurement resolution” refers to the smallest change in an applied signal that an instrument can detect. Although this change can be described in terms of applied mA, it is more constructive to describe it in terms of measured units. For example, telling you a given instrument  has a measurement resolution of 80 µA is much less descriptive than saying that your measurement resolution is 0.50 psi. If the smallest measured change is too coarse, you need an instrument with higher resolution.

4-20 mA Measurement Resolution for Seletced Instruments

In the table that follows, just divide the full scale output of your 4-20 mA source by the indicated ADC Counts for a given Instrument to determine resolution in measured units. For example, a DI-145 Starter Kits applied to a 4-20 mA pressure sensor with a 0-1000 psi range provides 4.9 psi of resolution (1000 ÷ 204). A load cell with a full scale range of 100 lbs. applied to a DI-155 yields 0.020 lbs. of resolution (100 ÷ 5320.)

The table makes the following assumptions:

  1. You use either an external shunt resistor with a value of 250 Ohms, or an 8B32 or 8B42 process current amplifier (if the instrument supports them.)
  2. You have selected the optimum instrument voltage range for the measurement. For example, the 5-V range for the DI-155.
  3. Your 4-20 mA output is zero engineering units at 4 mA and full scale EU at 20 mA.
  4. The instrument supports only bipolar inputs.
Instrument ADC Counts Example (psi)* Comments
DI-145 204 4.9 External 250Ω shunt
DI-149 204 4.9 External 250Ω shunt
DI-155 ~5320 0.19 External 250Ω shunt
DI-245 6553 0.15 External 250Ω shunt
DI-710-xHx 6553 0.15 External 250Ω shunt
DI-710-xLx 3276 0.31 External 250Ω shunt
DI-718B 8192 0.12 DI-8B32 or -8B42 amplifier
DI-718Bx 8192 0.12 DI-8B32 or -8B42 amplifier
DI-788 8192 0.12 DI-8B32 or -8B42 amplifier
DI-720** 8192 0.12 DI-8B32 or -8B42 amplifier
DI-730** 8192 0.12 DI-8B32 or -8B42 amplifier

* Assumes a full scale measurement range of 1000 psi.

** With the DI-78B Backpack option.


How To Install Model DI-245 Under Windows XP

Categories: Data Acquisition Leave a comment

Since our new model DI-245 voltage, millivolt, and thermocouple data acquisition system was released after Microsoft very vocally discontinued support for Windows XP, the instrument is the first in a long while that does not natively support that operating system. We’ve since learned to our chagrin that Microsoft continues to provide XP support in some countries, creating a quandary: For the first time Windows operating system support is a function of your location on the planet. Sigh…

Customers who still use XP and who want to deploy the DI-245 on that platform can use this guide to do so. Installation is the same as for a contemporary OS, except that drivers need to be downloaded and installed separately. Here’s the procedure:

  1. Download DI-245 software from
  2. Install the software, which installs everything you need to use the DI-245 except drivers.
  3. When you connect the DI-245, your computer will complain that DI-245 drivers do not exist.
  4. Download a ZIP file containing drivers from this link, and unzip the contents to a folder in a known location on the target XP PC.
  5. Manually install the drivers from the Windows Device Manager. If you aren’t sure how this is done, this guide provides a step-by-step procedure. 
  6. Do not be alarmed by the dialog box stating that a driver may harm your PC. Simply click CONTINUE ANYWAY.
  7. PLEASE NOTE that you need to install two drivers, executing steps 5 & 6 twice, one for the USB port and another for the virtual COM port that the DI-245 hooks to communicate with the PC. The driver file that you downloaded contains both.

Your DI-245 is ready to use.


Introducing the DI-245 Voltage and Thermocouple Data Acquisition System

Categories: Data Acquisition, New Products, WinDaq Data Acquisition Software Leave a comment

DATAQ Instruments is pleased to introduce the all-new DI-245 Voltage and Thermocouple data acquisition system. The DI-245 provides four analog inputs that can be individually configured to measure voltage or thermocouple data.  With 12 programmable measurement ranges from ±50V to ±10mV, the DI-245 provides resolution up to 1.2µV. The DI-245 supports J, K, T, B, R, S, E and N type thermocouples.


Additional Reading:

First Impressions of the DI-149 Data Acquisition Starter-Kit

Lascar’s ‘Files Thru the Air’ Technology

Categories: Data Logger, Temperature and Humidity Data Loggers, Temperature Data Loggers, Thermocouple Data Loggers, Wireless Data Loggers Leave a comment

Users can manage and monitor any number EL-WIFI series instruments remotely…

Lascar’s ‘Files Thru the Air’ technology allows those using EL-WIFI seies instruments to store data to the cloud. Users can manage and monitor any number EL-WIFI series instruments remotely, using a web browser on their PC or mobile device. In addition, email alerts can be sent automatically when humidity and/or temperature rise above or fall below user defined alarm levels. So what are you waiting for? Setting up a cloud account is free!

Check out this video demonstration to learn how Lascar’s ‘Files Thru the Air’ technology works!


Additional Reading:

Cloud-based Device Management for EL-WIFI Data Loggers

Four Easy Steps to Wi-Fi Data Acquisition

The new DATAQ Instruments Forum

Categories: FAQs Leave a comment

About a year ago DATAQ Instruments rolled out a new forum tied into our support ticket system. The ticket system and forum now use the same login. Recently we closed all new posts to the old forum at The old forum can still be browsed, but no new posts will be allowed. The new forum can be found at We realize this is not the traditional bulletin board type forum most people are used to.

The new forum does require registration. If you have previously submitted a support ticket, you can use the same login for the forum. Follow the directions below:

  1. Go to and click on the “Ask a question” link.

    DATAQ Ticket System

    Click on the Ask a Question link.

  2. A popup login screen will open. If you have previously submitted a ticket you can login and post a question immediately using the same login. If you had not, click on the “Register” link.

    Register to post to the Forum.

    Click on “Register”

  3. Enter your email address (please double-check it) and Name.

    Enter your Email address and Name

    Enter your Email Address and Name.

  4. An email with further instructions will be sent to the address provided. Follow the directions contained therein to complete registration (the email will provide a link that will take you to a password setup screen).

    Follow the directions provided in the Email you receive

    Follow the directions provided in the Email you receive

  5. Once your password is set you will be logged in automatically and you will be able to post a question by clicking on the “Ask a question” link.

We will continue to iron out any wrinkles we find in this system. Feel free to comment to this post to tell us what you think or to ask for further instructions.

Discontinued Support for Windows XP

Categories: Data Acquisition, WinDaq Data Acquisition Software 2 Comments

As you may have heard, Microsoft has discontinued support for Windows XP, effective April 8th, 2014. After a 12-year run, Microsoft will no longer release updates or security patches for the widely embraced operating system. Consequently, DATAQ Instruments will also end support for Windows XP. While we will continue to assist those who are using Windows XP with previously known issues relating to the operating system, we will no longer make concessions for future Windows XP issues in forthcoming releases of our drivers or WinDaq data acquisition software.

Discontinued support for Windows XP


If you haven’t done so already, we strongly recommend upgrading to a more contemporary version of Windows, i.e. Windows 7, 8 or 8.1 (32 or 64-bit). An upgrade will not only allow you to continue acquiring data, trouble free, it will give you some piece of mind knowing that Microsoft is continuing to issue upgrades and security patches to protect your data.

Unfortunately, many of the security vulnerabilities present in Windows 7, are also present in Windows XP. As a result, hackers will wait for Microsoft to release security patches for Windows 7 and use those patches as a “road map” to exploit those same vulnerabilities under Windows XP, which will no longer receives security patches.


Additional Reading:

Windows Vista and Windows 7/8 Support Schedule


Error Binding UDP Port 1234

Categories: Data Acquisition, FAQs Leave a comment

It’s come to our attention that some DI-720/730 Ethernet users are having trouble communicating with their instruments. Upon running the DATAQ TCP/IP Manager, users receive an error message stating that there is an “Error Binding UDP Port 1234” and that the IP Manager cannot continue. We are working hard to determine the cause of the problem, which at this point seems unrelated to the DI-720/730s themselves. In the meantime, there is a simple workaround to get customers encountering this error up and running.

The workaround involves disabling and re-enabling the network interface controller (NIC).

To do so (using Windows 7 or 8):

1.)    If the DATAQ IP Manager is running, shut it down.

2.)    Make sure that the DI-7×0-EN is powered up and connected to your PC.

3.)    Navigate to the Windows Control Panel, choose ‘Network and Internet’ and select ‘View network status and tasks’ from the Network and Sharing Center group.

4.)    In the Network and Sharing Center, choose ‘Change adaptor settings’.

5.)    Select the Local Area Connection (the network interface controller NIC that the DI-7×0 is connected to) and click ‘Disable this network device’.


6.)    Once disabled, click ‘Enable this network device’ to re-enable the network card.


With the NIC disabled and re-enabled, you can run the DATAQ IP Manager normally, select you DI-720/730 and choose ‘Start WinDaq’.

Boot Your Graphtec Data Logger in USB Drive Mode

Categories: Data Logger, FAQs Leave a comment

An oft-overlooked feature of Graphtec data loggers is the ability to boot into USB Drive Mode. As the name implies, USB Drive Mode allows you to access, save, copy and delete files from your GL220, GL820, GL900, GL7000 or MT100, just as you would with a USB flash drive.



USB Drive Mode makes it simple to transfer data files from the Graphtec logger to your PC hard drive, and to view them using the included, PC based APS software. USB Drive Mode is also the easiest way to move data acquired in CSV format to your PC. Rather than transferring CSV files from the Graphtec logger to a USB thumb drive, and on to the PC; simply drag data files from Windows Explorer to your desktop!



As with any other USB drive, files of any type can be saved to your Graphtec logger. Save a PDF of the user’s manual, screenshots, or even a PowerPoint presentation; keeping all pertinent information in one place.

How to Boot Your Graphtec Data Logger in USB Drive Mode

To boot in USB Drive Mode:

1.)    Connect the Graphtec data logger to your PC via USB

2.)    While holding down the Start/Stop button, turn the power ON.

3.)    As the Graphtec logger boots, continue holding down the Start/Stop button until the ‘USB Drive Mode’ screen appears, and release.

The Graphtec logger will be recognized by your PC as external drive, visible in Windows Explorer.

To exit USB Drive Mode, turn the power off and back on again without the Start/Stop button held down.


Additional Reading:

Back up GL820 and GL900 Data Using Windows Built-in FTP Server

Sample Up to 14.4 kHz in Stand-alone Mode

Categories: Data Logger, Product Updates Leave a comment

Thanks to single-level cell (SLC) technology, DATAQ Instruments stand-alone data loggers can once again sample at throughput rates up to 14,400 samples per second.

Due to inconsistencies with older SD cards using multi-level cell (MLC) technology, we were forced to reduce the maximum stand-alone sample rate specification for DATAQ Instruments data loggers to 8 kHz, a 44% decrease. While SD cards using MLC technology allow for greater capacity by increasing the amount of data stored in individual memory cells, they require more error correction than a single-level cell SD card. The increased error correction results in slower write times.


With the discovery of single-level cell technology, whereby a single memory cell stores one bit of data, customers can consistently sample up to 14.4 kHz in stand-alone mode. In addition to faster write speeds, single level cell SD cards allow for up to 10 times the number of erase/write cycles as MLC cards. This makes single-level cell SD cards ideal for data acquisition, where information is repeatedly being stored and erased.

The new 2GB SLC SD cards can be purchased in our online store at:


Additional Reading:

Stand-alone Data Logger Features of DI-71X Products

Three Easy Steps for Stand-alone Data Logging Using a DI-71X Data Logger