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Chart Recorder for Temperature & Humidity


Item# iTHX-SD

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Quantity Price each
1-4 $487.62
5-9 $463.24
10-24 $438.86
25-49 $414.48
50-99 $390.10
100+ $365.72

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Lead Time ( If not in Stock): 5 weeks

Chart Recorder for Temperature & Humidity iTHX-SD iTHX-SD
Chart Recorder for Temperature & Humidity is rated 4.2 out of 5 by 5.
  • y_2020, m_10, d_30, h_17
  • bvseo_bulk, prod_bvrr, vn_bulk_3.0.12
  • cp_1, bvpage1
  • co_hasreviews, tv_0, tr_5
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  • clientName_omega
  • bvseo_sdk, java_sdk, bvseo-4.0.0
  • LOCAL, getAggregateRating, 2ms
  • Charting Web Server Application
  • Alarms by Email or Text Message
  • Record Years of Data on Popular SD Cards
  • Temperature
  • Humidity
  • Dewpoint
  • No Special Software Required
  • NEW Feature Added: Units with Dual Temperature and Humidity Probes
  • Compatible with Omega Enterprise Gateway
  • Download iServer Software
  • Log data with Omega Enterprise Gateway(OEG)
5 Year Warranty

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Input Type
Input Ranges
Output Type
Display Type
Supply Voltage Type
Additional Feature

Product Specs

View Temperature + Humidity With A Web Browser
The OMEGA™ iTHX-SD transmitter lets you monitor and record Temperature, Relative Humidity and Dew Point over an Ethernet network or the Internet with no special software except a Web Browser.

The iTHX-SD serves Active Web Pages to display real-time readings, display charts of temperature and humidity, or log data in standard data formats for use in a spreadsheet or data acquisition program such as Excel or Visual Basic. The virtual chart viewed on the web page is a JAVA™ Applet that records a chart over the LAN or Internet in real-time. With the iTHX-SD, there is no need to invest time and money learning a proprietary software program to log or chart the data.

Live Readings
Click to see the live readings
from Santa Ana, CA

using the iTHX-SD Temperature & Humidity Ethernet Transmitter

SD Flash Memory Card
The iTHX-SD comes complete with a removable SD Flash Memory card that can store up to years of readings taken at ten second intervals.

Records on SD Flash Cards
The data is recorded on widely available SD (Secure Digital) flash cards. The format is a simple text file that is easily imported to spread sheets and other programs. It can be read on a PC or MAC with a USB card reader. You can also download the data remotely over an Ethernet network or the Internet.

Alarm Relays
The iTHX-SD features two 1.5 Amp relays. With the easy Web-based setup page, the two relays can be programmed for any combination of temperature or humidity, and high or low set points. The relays can also be programmed to remain latched and require a manual reset if a limit is exceeded.

Battery Backup
The iTHX-SD comes with a universal 100 to 240 Vac power adapter. A standard 9 Volt Alkaline battery (also included) allows the device to log data for up to 2 days without external ac power. A failure on the Ethernet network will not interrupt data recording.

Adjustable Charts
Chart scales are fully adjustable on the fly. For example, the chart can display one minute, one hour, one day, one week, one month or one year. Temperature and humidity can be charted across the full span (-40 to 124°C, and 0 to 100% RH) or within any narrow range such as (20 to 30°C). When a second sensor is added, users can select a chart that records channel 1, channel 2, or the difference of the two channels.

Award-Winning Technology
The iTHX-SD is simple to install and use, and features OMEGA's award-winning iServer technology that requires no special software except a Web Browser. The iTHX-SD connects to an Ethernet Network with a standard RJ45 connector and sends data in standard TCP/IP packets. It is easily configured with a simple menu using a Web Browser and can be password protected. From within an Ethernet LAN or over the Internet, the user simply types its IP address or an easy to remember name such as "Cleanroom5" or "ServerRoom" in any Web Browser, and the iTHX-SD serves a Web Page with the current readings.

Email Alarms
All iTHX-SD models that are on a LAN that is connected to the Internet can trigger an alarm that can be sent by email to a user or a distribution list anywhere in the world, including text messages to cell phones and PDA's.

Link to Web CAM or IP Camera
The Web page includes a link to a “Web Cam” or “IP camera” (not included). If you get a message about an alarm condition, you can quickly click on the link to view the actual scene over the Internet.

Display and Chart Two Channels
The iTHX-SD transmitters come complete with a temperature and humidity probe for measurement of a single location. With the addition of a second probe, the iTHX-SD transmitter can measure and display temperature, humidity and dew point in a second location up to ten feet away. The transmitter can display and chart absolute measurements in both locations, or a differential measurement between the two locations. The second probe requires no change to the basic iTHX-SD transmitter hardware, it can be added at the time of purchase or in the future. Omega offers a choice of industrial probes in 2" and 5" lengths, and a wand style for ambient indoor applications. A simple DB-9 "Y" connector is available for adding a second probe.

Sensor and Calibration
It is not necessary to take the iTHX-SD out of service for routine calibration. The temperature / humidity sensors are interchangeable and can be replaced for about the same cost as a typical calibration. Omega offers replacement sensors with optional 3-point NIST traceable calibration certificates.

Typical Applications
The iTHX-SD is great for monitoring temperature + humidity in applications such as: clean rooms, computer rooms, HVAC systems, pharmaceutical and food processing and storage, hospitals, laboratories, semiconductor fabs, electronic assembly, warehousing, museums, manufacturing, greenhouses, farm animal shelters, and many more.


Accuracy/Range at 25°C- Non-Condensing:
±2.75% for 10 to 90%
±3% for 5 to 10% and 90 to 95%
±4% for 0 to 5% and 95 to 100%
Non-linearity: ±3%
Hysteresis: ±1% RH
Response Time: 8 seconds, tau 63%
Repeatability: ±0.1%
Resolution: 0.1%, 12 bit

DEWPOINT -90 to 125°C (-130 to 257°F)

Wand Probe iTHP-W-6:
19.1mm Diameter x 198mm Long (0.75" x 7.8")
Cable with DB9 connector: 152mm Long (6")
Cable operating temperature: 0 to 80°C (32 to 176°F)
Wand Probe:
±0.5°C for 5 to 45°C (±1°F for 41° to 113°F);
up to ±1°C for 0 to 5°C and 45 to 60°C
(up to ±2°F for 32 to 41°F and 113 to 140°F)
Industrial Probe:
±0.5°C for 5 to 45°C (±1°F for 41 to 113°F);
up to ±1.5°C for -40 to 5°C and 45 to 124°C
(up to ±2.7°F for -40 to 41°F and 113 to 255°F)
(see chart)
*Note: extended temperature range is for Industrial Probe only, the iServer's operating temp. is 0 to 60 °C.
Response Time: 5 to 30 seconds, tau 63%
Repeatability: ±0.1°C
Resolution: 0.1°C, 14 bit
Industrial Probe iTHP-2, iTHP-5:
16mm Diameter x 51mm Long (0.63" x 2") or
16mm Diameter x 137mm Long (0.63" x 5")
Cable with DB9 connector: 0.9m Long (3') or
Cable with DB9 connector: 3m Long (10')
Cable operating temperature: -40 to 125°C
(-40 to 257°F)
Optional and Standard Caps for Probes
One porous polyethylene cap IP-PCI or IP-PCW (depending on your probe type) is included with each probe. An optional stainless steel cap IP-SC is available for industrial probes.
Instruction sheet for IP-PCI industrial probe cap.
Instruction sheet for IP-PCW wand probe cap.

Ethernet (RJ45): Fixed or autonegotiating 10/100BASE-T, Auto MDI/MDIX
Sensor: Digital 4-wire (DB-9)
Supported Protocols
LCD Display
16 Digits 6mm (0.23")
SD Flash Memory Card
2GB card: 8 months of data storage at 1 second recording intervals or 7 years at 10 second intervals
Relay Outputs
Two Relays 1.5A @ 30 Vdc
Device configuration and monitoring through embedded WEB server
Embedded WEB Server
Serves WEB pages containing real-time data and live updated charts within definable time intervals.

Operating Temperature:
iServer Unit: 0 to 60°C (32 to 140°F)
ac Power Adapter: 0° to 40°C (32° to 104°F)
Back-up Battery: -18 to 55°C (-0.4 to 131°F)
Storage Temperature: -40 to 85°C (-40 to 185 °F)

Material: Steel metal case with wall mount bracket
Dimensions: Refer to iTHX-SD Mechanical Section
Weight: 0.389 kg (0.86 lbs.)

Power Input: 9 to 12 Vdc
Consumption: 3.5 W
Safety Qualified ac Power Adapter (included)
Nominal Output: 9 Vdc @ 0.5 A
Input: 100 to 240 Vac, 50/60 Hz
Back-up Battery: 9Vdc, Alkaline
Universal ac Power Adapter
Universal ac Power Adapter

No need to take your unit out of service to get re-calibrated, order a calibrated probe instead.
Protective Caps

Optional Probe Caps shown,
fits industrial or wand probe
NIST Certificate

Get a NIST Traceable Calibration Certificate
with your Calibrated Replacement Probe.

Rated 5 out of 5 by from Great Features We have incorporated this device in a Environmental Monitoring Unit for an Antenna Radome to provide us with historical data on the Environmental conditions within the Radome. We have storage data from one system for over 3 years recorded which allows feedback to the OEM of the Antenna and Radome.
Date published: 2017-01-31
Rated 5 out of 5 by from Works as expected Been installed in a proper machine shop with oil vapor and the likes. Sensor element is trash in my opinion (5% change over 2 years) but designed to be replaced yearly if maintaining certification is your requirement. The iTHX device, although showing it's age, still trucks along just fine. Gathering data is easy and there is no software crippling (why I stay with Omega, it does what it says it does today and 10 years from now). Their documentation allows for anything from a highly engineered system's dev team to a script writer to easily integrate this sensor. Exactly what was advertised, and has never had issues. Also, the last two sensors were of a higher caliber than previously. It's nice to be able to call someone at this price point as well.
Date published: 2016-09-27
Rated 1 out of 5 by from Device Does Not Connect and Bad Service Ordered this device for alarms but it has difficulty connecting to network and randomly decides not to connect when hardwired to the computer for configuration. Omega has terrible customer service. Even with the warranty they did not help me fix my problem (took a year of me emailing and calling them before they responded). They sent me back the device saying there was no problem. It still does not work.
Date published: 2020-10-08
Rated 5 out of 5 by from Always performs to my expectations I have been using these for years now and they keep on working.
Date published: 2018-02-15
Rated 5 out of 5 by from Great service and products. I bought this item and when I received it we found that it had a cracked probe. I called Omega and talked to an engineer about this and he immediately sent out a replacement with hardly no questions asked. It was also sent overnight at no charge to me. GREAT service and products.
Date published: 2017-06-01
  • y_2020, m_10, d_30, h_17
  • bvseo_bulk, prod_bvrr, vn_bulk_3.0.12
  • cp_1, bvpage1
  • co_hasreviews, tv_0, tr_5
  • loc_en_US, sid_ITHX-SD, prod, sort_[SortEntry(order=HELPFULNESS, direction=DESCENDING), SortEntry(order=POSITIVE_FEEDBACK, direction=DESCENDING), SortEntry(order=SUBMISSION_TIME, direction=DESCENDING)]
  • clientName_omega
  • bvseo_sdk, java_sdk, bvseo-4.0.0
  • LOCAL, getReviews, 12ms

So, we have been using these devices without fail in multiple locations. As of today (08FEB20), whenever we log into the web app, and attempt to do a download of data at the 1 month block it says Failed - No File.

Asked by: MarkGPI
Please e-mail the software you are using and version to DAS@OMEGA.com and we will try to resolve with Engineering.
Answered by: PVDAS
Date published: 2020-02-12

Hello I am unable to view the chart in win 10 pro or use the java selection. Ca you help

Asked by: Gogoal
Due to security issues Java is no longer supported by web browsers there please click on the following link down load and install our Omega Enterprise Gateway software which you can use to monitor and log the data: ftp://ftp.omega.com/public/DASGroup/products/OEG/Omega_Enterprise_Gateway_64bit.zip
Answered by: cw3engineer
Date published: 2020-02-12

Received ours today Dec 23, 2019. Also am getting the HTProbe2 Error. Can an OMEGA engineer clear this up please?

Asked by: Chris0219
Once you get the units connected on the network, you can change the setup on the IP page and the error will clear.
Answered by: Chris0219
Date published: 2020-01-07

Can the iTHX-SD be used as a handheld device to quickly take readings at multiple locations? Ultimately we plan to position the device in a permanent location and connect it to our network but I'm wondering if the device can also be used as a handheld.

Asked by: Matt524
Hello I am sorry it is not designed as a hand held device you cannot start and stop the device except using a PC through the network to send commands.
Answered by: cwengineer3
Date published: 2019-11-21

The iTHX-D3 used a separate End Character for Temp, Hum and Dew Point. We knew which one was being transmitted to the PLC based on that end character. Now the D3 has been replaced by the SD and it does not allow us to do this. What options do we have now?

Asked by: MikeS
The SD version does not have the option for the end character that is correct. However management has reinstated the D3 unit so you can contact customer service and return the SD model and order a D3 to fit your needs.
Answered by: cwengineer3
Date published: 2019-08-24

According to the Product Spec sheet for Omega iTHX-SD Chart Recorders, regarding "Sensor and Calibration" it states "It is not necessary to take the iTHX-SD out of service for routine calibration." Does this mean that routine calibration is not required?

Asked by: MichaelVale
We sell the pre-calibrated probes, you could order them three or four weeks before the ones you have expire (that is typical lead time for you), that way you do not have to put your devices out of service. Thank you.
Answered by: Application Engineer
Date published: 2019-07-18
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  • bvseo_sdk, java_sdk, bvseo-4.0.0
  • LOCAL, getContent, 39ms
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