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Chart Recorder for Temperature & Humidity


Item# ITHX-SD-2

Volume discounts available
Volume Discount Schedule
Quantity Price each
1-4 $706.08
5-9 $670.78
10-24 $635.47
25-49 $600.17
50-99 $564.86
100+ $529.56

In stock

Lead Time (If not in stock): 8 weeks
Chart Recorder for Temperature & Humidity ITHX-SD-2 ITHX-SD-2
  • Charting Web Server Application
  • Alarms by Email or Text Message
  • Record Years of Data on Popular SD Cards
  • Temperature

ITHX-SD-2 Model Options

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Edit these specs to order a different model. Not all combinations are valid. Options compatible with previous selections will be in bold.

*Highlighted options are not compatible. Please select a different combination.

Additional Feature
Measurement Type
Number of Measurements
Input Type
Maximum Samples
Data Interface
Max Sampling Rate

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.

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.

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.
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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 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 1 out of 5 by from Solid devices with absolutely mediocre management These devices run on ancient software, and forget their configured settings every time they lose power. They use 9V batteries for backup, which is not ideal because they can't be charged by the main power source, so if you need to deploy a bunch of these, it will be impossible to keep track of constantly replacing the batteries. The server product is difficult to find information on, and is also garbage with extremely limited features and functionality. They do not support WiFi or PoE for easy deployment options. The only pro to these is that they are accurate, and the device itself is very durable. Everything else stinkss though...look elsewhere.
Date published: 2021-01-11
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 5 out of 5 by from Excellent product Purchased for one of my customers and they love these. Easy to use.
Date published: 2023-02-20
Rated 4 out of 5 by from Our experience with the Chart Recorder These are nice for laboratory environmental monitoring/logging but somewhat cumbersome to set up and retrieve data from. I could not download data via the Ethernet port to my pc but was able to do so via the SD card. Problem with that was that recording start date and time has to be set each time Standby is pressed and the SD card is taken out then put back in. Overall a decent instrument.
Date published: 2021-10-27
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
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Previous Omega Model DPiTH Serial RS-232 let us read Humidity through *X01 and Temperature through *X02 queries. Does Telnet interface on ITHX-SD-5 model support same queries or equivalent to read Temp and/or Hum directly through SCPI queries?

Asked by: svaleal
Thank you for your question. The command queries for the ITHX device are different. Please refer to section 4.91 of manual you can download from our website.
Answered by: TREX
Date published: 2020-06-26

My unit appears to be functioning normally--it displays temp & humidity & I can access these readings over internet. Recording is "ON". The "R" on the displayed "%RH" is flashing. What does that mean?

Asked by: Calguy
That mean recording is in progress.
Answered by: J B E
Date published: 2023-07-07

I would like to know the administrator password for a device THX-SD 18240420

Asked by: Truoc
admin=00000000 user=12345678
Answered by: rlock
Date published: 2021-03-25

Every time this device loses power, it loses its recording schedule. Is it possible to release a firmware update that can a) retain settings after a power loss, or b) read a settings configuration file off the SD card, or c) record on startup by default?

Asked by: J B E
Thank you for your question. We will require more information to help on this question, please email the DAS team at DAS@OMEGA.COM
Answered by: Application Engineer PV
Date published: 2023-07-07

I have iTHX-SD-2, M21210492. With a humidity probe tip of iTHP-2-DB9. the probe is using an RS232 to connect the display reader. Do you sell a probe with a longer cable?

Asked by: CKtoYF
Thank you for your question. Yes it is:
Answered by: Application Engineer PV
Date published: 2022-06-09

The screen is showing HTProbe2 *ErrorR ; what is this error and how can I remove it? I can still see readings from the browser, but I cannot see readings on the ITHX-SD screen because of this error.

Asked by: Just1612
Thank you for your question. We will require more information to help on this question, please email the DAS team at
Answered by: PVENGR
Date published: 2024-01-16

How can I update firmware for our ITHX-SD datalogger? And where can I download the latest firmware?

Asked by: Amador
Thank you for your question. We will require more information to help on this question, please email the DAS team at DAS@OMEGA.COM
Answered by: Application Engineer PV
Date published: 2023-12-05

Where can I get latest firmware for the ithx-sd?

Asked by: JayInLaurel
Thank you for your question. We will require more information to help on this question, please email the DAS team at DAS@OMEGA.COM”
Answered by: Application Engineer PV
Date published: 2023-12-06
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