testo 174 Bluetooth® data loggers
0572 1742 01
0572 1743 01
User manual 
About this document
- The instruction manual is an integral part of the instrument.
- Keep this documentation to hand so that you can refer to it when necessary.
- Always use the complete original instruction manual.
- Please read this instruction manual through carefully and familiarize yourself with the product before putting it to use.
- Hand this instruction manual on to any subsequent users of the product.
- Pay particular attention to the safety instructions and warning advice in order to prevent injury and damage to the product.
Safety and disposal
2.1 Security
General safety instructions
- Only operate the product properly, for its intended purpose, and within the parameters specified in the technical data.
- Do not apply any force.
- Do not operate the instrument if there are signs of damage to the housing or connected cables.
- Dangers may also arise from objects to be measured or the measuring environment. Always comply with the locally valid safety regulations when carrying out measurements.
- Do not store the product together with solvents.
- Do not use any desiccants.
- Only perform maintenance and repair work on this instrument that is described in this documentation. Follow the prescribed steps exactly when doing the work.
- Use only original spare parts from Testo.
Batteries
- Improper use of batteries may cause the batteries to be destroyed, or lead to injury due to current surges, fire or escaping chemicals.
- Only use the batteries supplied in accordance with the instructions in the instruction manual.
- Do not short-circuit the batteries.
- Do not take the batteries apart and do not modify them.
- Do not expose the batteries to heavy impacts, water, fire or temperatures in excess of 70 °C.
- Do not store the batteries in the proximity of metal objects.
- In the event of contact with battery acid: rinse affected areas thoroughly with water, and if necessary consult a doctor.
- Do not use any leaky or damaged batteries.
Warnings
Always pay attention to any information denoted by the following warnings.
Implement the precautionary measures specified!
DANGER
Risk of death!
WARNING
Indicates possible serious injury.
CAUTION
Indicates possible minor injury.
ATTENTION
Indicates possible damage to equipment.
2.2 Disposal
- Dispose of faulty rechargeable batteries and spent batteries in accordance with the valid legal specifications.
- The button cell used in the instrument contains 1,2-Dimethoxyethane (CAS 110-71-4). See EC Regulation No. 1907/2006 (REACH) Art. 33.
- At the end of its useful life, deliver the product to the separate collection point for electric and electronic devices (observe local regulations) or return the product to Testo for disposal.
WEEE Reg. No. DE 75334352
Intended use
The testo 174 BT data loggers are used for storing and reading out individual readings and series of measurements.
Readings are measured and stored with testo 174 BT and transmitted via Bluetooth® connection to the testo Smart App where they can be evaluated using. The data logger can also be programmed individually via the testo Smart App.
Examples of applications
- testo 174T BT is ideally suited for temperature measurement in in refrigerators, freezers, cold rooms and cold shelves.
- testo 174H BT monitors the climatic conditions, e.g. in warehouses, offices and in the manufacturing sector.
The testo 174 BT data loggers must not come into contact with unpackaged food.
The humidity sensor testo 174H BT may not be used in dust environment as the sensor could be polluted.
Product description
4.1 Device overview 
| 1 | LCD display | 2 | Operating button |
| 3 | Only testo 174H BT: Opening for humidity sensor | 4 | Battery compartment with battery protection strip |
| 5 | Only testo 174H BT: Cover of maintenance opening of humidity sensor – may only be opened by the service department | ||
Symbol explanation
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Observe instruction manual |
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Do not dispose of old appliances with household waste. |
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Chinese RoHS (Restriction of Hazardous Substances) symbol |
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polarity of the button cells |
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Symbol of the Bluetooth Special Interest Group (SIG) |
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Declaration of conformity: Products marked with this symbol comply with all applicable Community regulations of the European Economic Area. |
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Test symbol of the FCC in the USA |
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Declaration of conformity: Products marked with this symbol comply with all applicable Community regulations of the United Kingdom. |
4.2 Display
Depending on the operating status, various information may be shown in the display. A detailed depiction of the information that can be called up can be found in the chapter “Operation”.
| 1 | Measurement program running | 2 | Measurement program ended |
| 3 | Wait for start of measurement program | 4 | Highest saved reading |
| 5 | Lowest saved reading | 6 | Reading |
| 7 | Units | 8 | Bluetooth |
| 9 | Start criterion Date/time programmed | 10 | Battery capacity |
| – Battery icon off: Battery empty (measurement program was stopped). Read out data and change battery. | |||
| 11 | Lower alarm value: – Flashes: programmed alarm value is shown – Lights up: programmed alarm value was undershot |
12 | Upper alarm value – Flashes: programmed alarm value is shown – Lights up: programmed alarm value was exceeded |
The display speed of liquid crystal displays slows down at temperatures below 0 °C (approx. 2 seconds at -10 °C, approx. 6 seconds at -20 °C) for technical reasons. This does not influence the measuring accuracy.
4.3 Button functions
Operating status Wait and start criterion Button start programmed:
1 Press and hold GO button approx. 3 seconds to start the measurement program.
The measurement program starts and Rec appears in the display.
Operating status Wait:
1 Press GO button in order to change between displays of the upper alarm value, lower alarm value, battery life and last reading.
These are shown in the specified sequence in the display.
Operating status Rec or End:
1 Press GO button in order to change between displays of the highest saved reading, lowest saved reading, upper alarm value, lower alarm value, battery life and last reading.
These are shown in the specified sequence in the display.
First steps
5.1 Releasing/securing data logger
The data logger is delivered secured.
Releasing data logger
- Push both locks on the bottom of the wall bracket outwards.
- 6Slide data logger out of the wall bracket.
Securing data logger
- Slide data logger into the wall bracket.
- Push both locks on the bottom of the wall bracket inwards.
5.2 Activating batteries
The data logger is supplied with batteries inserted.
1 To make the data logger ready for operation, pull the battery protection strip out.
Symbol explanation
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Do not allow children under 6 years of age to play with batteries. |
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Do not throw batteries in the trash. |
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Do not charge batteries. |
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Do not place batteries near fire. |
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Batteries are recyclable. |
5.3 Establishing a Bluetooth® connection
The data logger can be connected to the testo Smart App via Bluetooth® connection.
The data logger is switched on.
5.3.1 Establishing a Bluetooth® connection to the testo Smart App
To establish a connection via Bluetooth® , you need a tablet or smartphone with the Testo Smart App already installed on it.
You can get the App for iOS instruments in the App Store or for Android instruments in the Play Store. Compatibility:
Requires iOS 13.0 or later/Android 8.0 or later, requires Bluetooth® 4.2 or higher.
- Open the testo Smart App.
The app automatically searches for Bluetooth® devices in the vicinity. - If several devices are found, select the desired device and select Connect.
If applicable confirm the pairing request of the operating system (Android / iOS).
If the connection is successful, the device is visible on the app in the device list menu item.
Using the product
6.1 Programming data logger
In order to adapt the programming of your data logger to your individual requirements, you require the testo Smart App.
You can get the testo Smart App for iOS instruments in the App Store or for Android instruments in the Play Store.
Compatibility:
Requires iOS 13.0 or later/Android 8.0 or later, requires Bluetooth® 4.2 or higher.
The Testo Smart App is kept updated via the Play Store for Android devices and the App Store for iOS devices. Please update the App as soon as a new update is available. We therefore recommend that you do not disable automatic notifications when new updates are available.
6.2 Mounting wall bracket
Mounting materials (e.g. screws, anchor plugs) are not included in the delivery.
✓ Data logger is removed from the wall bracket (see Releasing/securing data logger).
- Position wall bracket at the desired location.
- Using a pen or similar, mark the location for the fastening screw.
- Prepare the fastening location for the attachment in accordance with the material (e.g. drill hole, insert anchor plug).
- Fasten wall bracket using an appropriate screw.
6.3 Reading out data
The data logger is read out and the read-out data are processed further by the testo Smart App.
Maintaining the product
7.1 Changing batteries
The running measurement program is stopped when the battery is changed. The stored data are preserved, however.
- Remove the data logger from the wall bracket.
- Read out stored data via testo Smart App.
If it is no longer possible to read out the stored data because the battery capacity is too low:
Change batteries and then read out the stored data. - Place the data logger on its front.
- Open battery compartment cover on the rear of the data logger by turning to the left and remove it.
Use a coin for this.
- Remove empty batteries and dispose of them in accordance with the valid legal specifications.
If LCD display is still active after removing the old batteries, press the operating button to reset the battery display of the logger. - Insert two new batteries (3 V button cell of manufacturer EVE, CR 2032 lithium) so that the + pole is always visible.
Only use new branded batteries. If a partially used battery is inserted, the calculation of the battery capacity is not performed correctly.
- Place battery compartment cover on the data logger and close it by turning it to the right.
Use a coin for this.
The current reading is shown on the display screen.
The data logger must be reconfigured via testo Smart App. - Start testo Smart App and create a connection to the data logger.
- Reconfigure data logger or install the old stored configuration.
The data logger is again ready for use.
7.2 Cleaning the instrument
If the housing of the instrument is dirty, clean it with a damp cloth.
Do not use any aggressive cleaning agents or solvents! Mild household cleaning agents and soap suds may be used.
Technical data
| Characteristic | Values |
| Operating temperature | testo 174T: -30 … +70 °C / -22 … +158 °F testo 174H: -20 … +70 °C / -4 … +158 °F |
| Storage temperature | -40 … +70 °C / -40 … +158 °F |
| Operating humidity | 0 … 100 %RH |
| Max. operating altitude | ≤ 2000 m / 6561 ft above sea level |
| Level of contamination | PD2 |
| EMC environment | Basic electromagnetic environment |
| Dimensions | 60 x 38 x 19 mm / 2.4 x 1.5 x 0.7 in |
| Wight | 35 g / 1.2 oz |
8.1 testo 174T BT
| Characteristic | Values |
| Probe type | Internal digital temperature sensor |
| Measuring range | -30 to +70 °C |
| Accuracy | ± 0.5 °C (-30 to +70 °C)1 |
| Resolution | 0.1 °C |
| Adjustment time | t90: 16,5 min t99: 40 min |
| Battery type | 2 x 3 V button cell (2 x CR 2032 lithium) |
| Battery life time | 500 days (15 min measuring cycle, +25 °C) |
| Protection class | IP65 |
| Meas. cycle | 1 min – 24 h (can be selected) |
| Memory | 16,000 readings |
| Declaration of conformity | see www.testo.com/eu-conformity |
| Acc. EN 12830-S, -T, 0.5 -30 … +70°C Ia2 |
1 Valid for t99. When measuring with t90, measurement value may be out of tolerance.
2 Please note that with this instrument in accordance with EN 12830 a regular inspection and calibration as per EN 13486 must be performed (recommendation: annually). Contact us for more information.
8.2 testo 174H BT
| Characteristic | Values |
| Probe type | NTC temperature sensor and internal capacitive humidity sensor |
| Measuring range | 0 to 100 % RH (not for condensing atmosphere3), – 20 to +70 °C |
| Humidity accuracy | Basic accuracy at 25 °C4: ± 3 % RH (measuring range 2 % RH to 98 % RH)4 Temperature impact ± 0.03 % RH/K ± 1 digit |
| Temperature accuracy | ± 0.5 °C (-20 to +70 °C)4 |
| Resolution | 0.1 % RH, 0.1 °C |
| Adjustment time temperature | t90: 15,8 min t99: 35 min |
| Adjustment time humidity | t90: 3 min t99: 30 min |
| Battery type | 2 x 3 V button cell (2 x CR 2032 lithium) |
| Battery life time | 1 year (15 min measuring cycle, +25 °C) |
| Protection class | IP20 |
| Meas. cycle | 1 min – 24 h (can be selected) |
| Memory | 2 x 16,000 readings |
| Declaration of conformity | see www.testo.com/eu-conformity |
3 For continuous applications in high humidity (> 80% RH at ≤ 30°C for > 12 h, > 60% RH at > 30°C for > 12 h), please contact us via www.testo.com/servicecontact.
4 Valid for t99. When measuring with t90, measurement value may be out of tolerance.
Tips and assistance
9.1 Questions and answers
| Question | Possible causes | Possible solution |
| – – – – lights up in the display * | The sensor of the data logger is defective. | Contact your dealer or Testo Customer Service. |
* This is also shown in the display if a new measurement program is transferred from the testo Smart App to the data logger. It changes back again after approx.
8 seconds. In this case, there is no error!
If you have any questions, please contact your dealer or Testo Customer Service. The contact details can be found on the back of this document or on the Internet at www.testo.com/service-contact.
9.2 Accessories and spare parts
| Description | Order no. |
| testo 174H BT mini data logger, 2-channel, incl. wall bracket, battery (2 x CR 2032 lithium) and calibration protocol | 0572 1743 01 |
| testo 174T BT mini data logger, 1-channel, incl. wall bracket, battery (2 x CR 2032 lithium) and calibration protocol | 0572 1742 01 |
| Battery, 3 V button cell (CR 2032 lithium), please order 2 batteries per logger | 0515 5174 |
| ISO calibration certificate humidity, calibration points 11.3 % RH; 50.0 % RH; 75.3 % RH at +25 °C/+77 °F; per channel/instrument | 0520 0176 |
| ISO calibration certificate temperature, calibration points -18 °C; 0 °C; +60 °C; per channel/instrument | 0520 0151 |
For a complete list of all accessories and spare parts, please refer to the product catalogues and brochures or visit our website www.testo.com.
Testo SE & Co. KGaA
Celsiusstraße 2
79822 Titisee-Neustadt
Germany
Telefon: +49 7653 681-0
E-Mail: info@testo.de
Internet: www.testo.com
0972 1740 en 01 – 11.2024
Documents / Resources
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testo 174 Bluetooth Data Loggers [pdf] User Manual 0572 1742 01, 0572 1743 01, 174 Bluetooth Data Loggers, 174, Bluetooth Data Loggers, Data Loggers, Loggers |
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testo 174 Bluetooth Data Loggers [pdf] User Manual 0572 1742 02, 0572 1743 02, 174 Bluetooth Data Loggers, Bluetooth Data Loggers, Data Loggers, Loggers |
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testo 174 Bluetooth Data Loggers [pdf] User Manual 174, 174 Bluetooth Data Loggers, Bluetooth Data Loggers, Data Loggers |