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User Manual

Therm-On18

Getting started 

    

In the Box:

Therm-On18 sensor

2pcs of AA batteries in the sensor

The User Manual

The Therm-On18 is a wireless Thermo Hygrometer 

for your Smartphone. It is built for indoor and 

outdoor use. The built-in Bluetooth low energy 

chipset insures long battery life. 

 

Simply download the free IROX-T App from the 

APP STORE or GOOGLE PLAY and you will be 

able to display your sensor’s current temperature 

and humidity.

Important:

Use only new batteries and never combine old 

batteries with new batteries. Observe polarity when 

inserting batteries!

Please also remember that used batteries do not 

belong in domestic trash, they should be disposed 

of at designated collection points. Our environment 

will appreciate it!

2. Connecting

Go to settings on your Smartphone and ensure 

Bluetooth is enabled.

This means that the batteries in the remote sensor 

need to be replaced 

Therm-On18 instruction

1. Batteries

Open the battery cover (backside of the sensor, 4 

screws) and remove the small plastic strip from the 

batteries.

NOTE: After a short while the LED in front of the 

Therm-On18 sensor will start flashing indicating 

that the sensor is transmitting. 

Important note on batteries   

• The Therm-On18 is delivered with batteries so 

that you can immediately put it into operation. 

These batteries may not last as long as store 

bought batteries. As soon as you have to replace 

the batteries in the remote sensor we recommend 

using alkaline batteries. Especially when outdoor 

temperatures drop to 0°C (32°F) or below these 

batteries will ensure a more reliable transmittal. If 

possible even use lithium batteries.

• Never use rechargeable batteries. The output of 

rechargeable batteries is often not sufficient for 

our devices.  

Battery Change  

The batteries last for about 8-12 months. 

Depending on the batteries used, this time frame 

may be a bit shorter or longer. To prevent an 

undesired and unexpected interruption of 

operation, a battery icon will appear in the channel 

display on your smartphone:

7. Care of the device

- Do not expose the device to extreme 

temperatures or direct sunlight over longer 

periods. 

- Avoid blows and shocks of any kind to the device.

- For cleaning use a dry soft cloth that you have 

moistened with water and a very mild cleaning 

agent. Never use volatile substances such as 

benzene, thinner, cleansing agents in spray cans 

etc.

- When the device is not being used store it in a dry 

area and out of the reach of small children. In 

such cases it is important to remove the batteries! 

- Please keep the Instruction Manual and other 

documents delivered with the device stored 

carefully so that you can reference them at a later 

point if necessary.

- Important: All disposal fees in Switzerland (vRG) 

as well as in the EU (WEEE) for all Irox devices 

are covered.

8. Support

This device is a new development of Irox 

Development Technology. All information was 

made and checked by means of a functioning 

device. It may occur that adjustments and 

improvements of the device will take place that due 

to typographical procedures were not able to be 

listed in this manual. Should you notice deviations 

which make it difficult for you to operate and use of 

the device you may at any time download the latest 

manual onto your PC free of charge at 

www.irox.com. 

Next simply start the IROX-T App on your 

smartphone and wait until the sensor automatically 

connects. Connecting takes from 1 to 30 seconds.

After the sensor is connected, the current time, 

temperature and humidity will be displayed on the 

HOME page along with the minimum and maximum 

values and, in the humidity window, a text 

describing the humidity level:

Low     <25%

Normal 25-50%

High     >50%

4. View 24-hour sensor history

To view the 24-hour sensor history simply tap the 

red temperature window or the blue humidity 

window on the HOME page.

On the 24-hour sensor history page, you can see:

a- Temperature: current temperature, dew point 

and heat index (only for temperatures above 26°C) 

and the minimum, maximum and average 

temperature for the last 24 hours and a 24-hour 

bar graph.  

b- Humidity: current relative humidity, minimum 

and maximum for the last 24 hours and a 24-hour 

bar graph.

Tap “HOME” to return to the HOME page and 

there you may change from Temperature to 

Humidity or vice versa. The channel you may 

change on all screens by taping on the channel 

number at the bottom (1, 2 or 3). This is naturally 

only so for the sensors actually present and shown 

on the display (see Chapter 5).

Example when channel 1 and 3 are connected

5. Connecting multiple Therm-On18 sensors

The IROX-T App allows you to connect up to three 

Therm-On18 sensors simultaneously.  

To connect multiple sensors open the battery cover 

on the Therm-On18 sensor and ensure that all the 

sensors have a different channel. Set the first 

sensor to channel 1 and the second to channel 2 

and the third to channel 3.

Channel change 

- Please select a channel with the sliding switch 

- Press RESET to activate the change (e.g. with a 

paper clip) 

6. Specifications:

Power supply

2 Type LR6 (AA) 1.5 V Batteries

Measuring range outdoor sensor

Temperature: -35C to +70C 

Relative air humidity: 30% to 80% RH

Transmission

Transmission Frequency: Bluetooth low energy

Transmission range: up to approx. 50 meter in 

open terrain

Works on

 Bluetooth 4.0 Smart ready devices: 

(iPhone 4s or newer, Samsung S4 and HTC One 

with 4.2.2 or newer, Nexus 5, iPad 3 or newer, 

iPad air, iPad air mini)

3. Link your Therm-On18 to the App

Download the App IROX-T to your device. You will 

find this in the APP STORE (for Apple products) or 

GOOGLE PLAY (for Samsung and HTC Android 

products).

OS Technology AG/SA

CH-3073 Gümligen/Bern

www.ostechnology.ch

© Irox Development Technology 

KSPO:0142-14 (OST)

iROX NGE76 MANUAL 1(Eng)

Size: W60 x H105(mm)

Material: 80LBS WF-PAP

Printing color: Black(

双面印刷)

BY Lai H Z  1/04/14

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