The OMYL-RH25 is a temperature/humidity data logger that also accepts two external temperature or temperature/humidity inputs. This data logger is available with standard memory of 100,000 readings (OMYL-RH25) or expanded memory of 4 million readings (OMYL-RH25-4M). The following inputs can be configured:
• Internal temperature and humidity sensors • External temperature (Pt100/Pt1000 RTD, Type U thermistor) • External temperature/humidity (for combined external temperature/humidity probes)
The storage medium is non-volatile flash memory so no data is lost if the battery becomes discharged. Data logger setup as well as data retrieval is accomplished using the included standard OMYL-SOFT software. Downloaded data is stored in the OMYL-SOFT software as a text file for viewing in third party software packages or Microsoft Excel. The OMYL-SOFT standard software does not include any graphing functionality. Graphing and analyzing downloaded data files requires the OMYL-SOFT-PLUS version of the software (sold separately).
SPECIFICATIONS Internal Temperature Temperature Range: -30 to 70°C (-22 to 158°F) with standard lithium battery; -40 to 90°C (-40 to 194°F) with optional high temperature lithium battery Temperature Resolution: 0.01°C (0.02°F) Accuracy: See chart on PDF External Temperature Input Sensor: Pt100 or Pt1000 RTD, U thermistor (2000Ω @ 25°C) Range: -70 to 250°C (-94 to 482°F) Resolution: 0.01°C (0.02°F) Accuracy: See chart on PDF Internal/External Humidity Humidity Range: 0 to 100% RH Humidity Resolution: 0.01% RH Accuracy: See chart on PDF Reading Rate: 1 second to 24 hours; 2 Hz, 4 Hz in fast mode Start Modes: Immediate start, delayed start Memory Capacity OMYL-RH25: 100,000 readings OMYL-RH25-4M: 4 million readings Memory Wrap Around: Yes (software configurable) Battery: 3V lithium battery [standard temperature range battery (included), optional high temperature range battery]; user replaceable Battery Life (Standard Temperature Range Battery): 4 years at 1 minute reading rate, 230 days at 10 second reading rate, 25 days at 1 second reading rate LED Functionality: Integrated status LED indicates data logging status, low battery or alarm condition Alarms: Software programmable high/low thresholds Computer Interface: USB (interface cable included) Software: XP SP3/Vista/7 and 8 (32- and 64-bit) Operating Environment: -30 to 70°C (-22 to 158°F) with standard lithium battery; -40 to 90°C (-40 to 194°F) with optional high temperature lithium battery Dimensions: 30 H x 50 mm dia (1.18 x 1.97') Weight: 70 g (2.5 oz) Enclosure: Robust, shock-proof POM, IP65
Rated 4 out of
Does the jobBought this to remotely monitor temperature in a residence. Does essentially what I need it to. Would really like to see an API so I can integrate it into my network more fully. Don't really like to have this information in the cloud.
Date published: 2016-02-12
Rated 1 out of
Flustrated WiFi from
Excellent Device for Loggin Data, bad connectionI bought this data logger to record the temperatures of the freezer and refrigerator at my company. The set up is easy and the logger pages are great but the device does not stay synced with the PC and would never set up on the cloud. The customer support was great, which attempted to assist me with the issues through a couple of weeks of trouble shooting. Unfortunately I could not resolve these issues. The set up on the PC go through the setup great and the device connects to the network as well as sets up the computer but after a few data downloads by the device it looses connection and cannot reestablish the connection to the network. I get the blinking antenna of death. As for the cloud, I do get through the connection to the Newark but the device continues to fail in the final setup so I never did get the device linked to the cloud.
Bottom line, the logging portion of the device is great but the connection side needs work. I will set my calendar reminder to download the data by way of USB every month to retain for records. So do not purchase this device if you would like a wireless data logger because it flat out does not operate properly, which I'm sure there are cheaper data loggers out there that just record with no WiFi or just network wired connection.
Date published: 2016-04-06
Rated 4 out of
Veggie Trail from
Troublesome but GreatWe had to purchase a new, used computer as our existing ones operated on windows 10, and this product is only compatible with windows 7. This caused quite a bit of frustration, but after spending more money on a computer we did get your monitor working and it is doing the job we wanted it to do.
So, having said all that, please let us know when you have a windows 10 version of the product,
Date published: 2016-04-01
Rated 2 out of
Troublesome, Not Trustworthy, Fails CalibrationI've had two of these units, the OM-EL-WIFI-TH and the TH+. They're easy to use and have a nice display. You have to pay $8/mo to monitor them, but the software is nice and has great features.
However, if you need a unit that's calibrated this isn't for you. Initial calibration was great. Year 2: failed calibration until they charged it all the way and then it passed. Year 3: failed calibration regardless if it was fully charged or not.
Don't buy this if calibration accuracy is important to you.
Date published: 2018-10-19
Rated 2 out of
Wi-Fi Functionality misleadingThis unit is supposedly designed for use on a Wi-Fi network, but it doesn't work with the most up to date WiFi encryption (WPA2). Omega happily handled the return, but this is obviously a significant design limitation of this device that should be stated upfront.
Date published: 2018-06-11
Rated 4 out of
Good hardware, latest software has issuesThis is my 2nd OM-EL-WIFI unit and I love the accuracy and wifi capabilities of the unit. I updated to the latest software release and could not get either unit (one's a Plus) to save the data. I called tech support and they sent me a document outlining specifics steps to take, but still no go. I went back to the previous software release (1.30.xxx) and they work fine now.
Date published: 2018-04-11
Rated 3 out of
Work okBought 4 units to keep track of humidity in an older school building. Units drop the wifi connection frequently even though the signal strength is a 6 (out of 10) or better. Frequent interruption of the data collection.
Date published: 2016-08-15
Rated 5 out of
Great InstrumentI've purchased several of these over the last couple years for our lab. They work great, the WIFI is convenient, and having the real time data tracked 24/7 has been valuable.
A previous question asked about the amount of time needed to acclimate or get to full accuracy. After these sensors have "acclimated", will they be sensitive enough to monitor small changes(0-2%) over a period of seconds/minutes?
Asked by: Zach 2
The unit runs via a WiFi connection, it is limited to the speed of the network. Reading intervals are as fast as one every ten minutes, as slow as one every ten hours, the resolution for humidity is 1% and for temperature is 0.1
Answered by: JA Engineer
Date published: 2020-01-09
Which thermometer would respond more quickly, the OM-EL-WiFi-TP or the OM-EL-WiFi-TC, and how long would it take to get a stable reading?
Asked by: Allan
Hello Allan, response time is at least 60 minutes before your readings are at full accuracy.
Answered by: PVDAS
Date published: 2019-11-16
Are there temp/humidity sensor options that allow for a real-time export of the data or a configurable XML output to a local port?
Asked by: JoeS
The logged data from the OM-EL-WIFI unit can be imported to EXCEL after it is displayed on PC. You cannot import real-time.
Answered by: Application Engineer
Date published: 2019-07-11
How to switch units from °F to °C
Asked by: glenn A
Hi, to advise on your question, please see section 7.4 of the manual at the following link to change the units on your logger: https://assets.omega.com/manuals/M5381.pdf
Answered by: Jane
Date published: 2019-06-25
is there a calibration certificate coming with instrument, and If so, is it traceable to ILAC-MRA standards?
Asked by: paulo
Hi, thanks for connecting with us. The calibration certificate is an additional purchase. If you order this at the time of purchase, it would come with the logger. Yes, our certificates are NIST traceable as well as traceable to ILAC-MRA standards. MDQ Calibration Laboratory is accredited to ISO 17025:2005 by PJLA which is an MRA Signatory of ILAC. The insignia for both ILAC-MRA and PJLA are included on our calibration certificates. Please contact us if you have any further questions.