Testo 115i Smartphone Clamp Thermometer
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A. Product Overview
The Testo 115i is a compact smartphone-operated clamp thermometer from the Testo Smart Probes series. It is designed for installation, servicing and troubleshooting work on refrigeration, air-conditioning and heating systems.
The spring-loaded clamp attaches directly to a pipe and measures its surface temperature using an integrated NTC sensor. Measurement values are sent wirelessly to a compatible smartphone or tablet through Bluetooth.
The Testo Smart App acts as the display and operating interface. Technicians can view live temperature readings, monitor temperature changes graphically, save measurement data and prepare reports in PDF or Excel format.
Key Features
- Measures pipe surface temperature
- Suitable for pipes from 6 to 35 millimetres in diameter
- Temperature measuring range from minus 40 °C to 150 °C
- Bluetooth communication range of up to 100 metres
- Real-time readings through the Testo Smart App
- Graphical display for identifying temperature changes
- Suitable for flow and return temperature measurement
- Supports superheating and subcooling calculations with Testo 549i
- Measurement reports can include photographs and comments
- Reports can be shared by email
- Compatible with A2L and A3 refrigerant applications
- Supplied with batteries and a calibration protocol
Main Technical Specifications
Product name: Testo 115i Smartphone Clamp Thermometer
Order number: 0560 2115 02
Sensor type: NTC
Measuring range: Minus 40 °C to 150 °C
Accuracy: Plus or minus 1.3 °C between minus 20 °C and 85 °C
Resolution: 0.1 °C
Pipe diameter compatibility: 6 to 35 millimetres
Bluetooth range: Up to 100 metres
Operating temperature: Minus 20 °C to 50 °C
Storage temperature: Minus 20 °C to 60 °C
Battery type: Three AAA batteries
Battery life: Approximately 150 hours
Dimensions: 183 by 90 by 30 millimetres
Mobile compatibility: iOS 11 or newer and Android 6 or newer with Bluetooth 4.0
B. Working Principle
The Testo 115i measures temperature through direct contact with the external surface of a pipe.
The clamp is attached firmly around the pipeline so that the sensor maintains consistent contact with the pipe surface. The integrated NTC sensor changes its electrical resistance according to the measured temperature. The instrument processes this resistance change and converts it into a digital temperature reading.
The measured value is transmitted through Bluetooth to the Testo Smart App installed on a smartphone or tablet. The app displays the reading in real time and can present temperature progression as a graph or table.
When two Testo 115i clamp thermometers are used, technicians can measure temperatures at two different points, such as the flow and return lines of a heating system.
For refrigeration applications, the Testo 115i can be used with the Testo 549i pressure measuring instrument. The app combines the pipe temperature and refrigerant pressure readings to calculate refrigeration parameters such as superheating and subcooling.
C. Why Is the Testo 115i Used?
The Testo 115i is used because pipe temperature is an important diagnostic parameter in heating, refrigeration and air-conditioning systems.
Flow and Return Temperature Measurement
Technicians can measure the temperatures of flow and return pipes in heating systems. Comparing these readings helps assess heat transfer and overall system performance.
Refrigeration System Servicing
The instrument is suitable for checking pipe surface temperatures during the installation, commissioning and maintenance of refrigeration equipment.
Superheating Calculation
When used with the Testo 549i, the Testo Smart App can calculate superheating. This helps technicians evaluate whether the refrigerant is fully evaporated before entering the compressor.
Subcooling Calculation
The combined temperature and pressure measurements can also be used to calculate subcooling. This helps assess refrigerant condition at the condenser outlet.
Air-Conditioning Troubleshooting
Abnormal pipe temperatures can indicate problems such as incorrect refrigerant charge, restricted flow, poor heat transfer or improper system operation.
Temperature Difference Analysis
The Testo 115i allows technicians to compare temperatures at different measuring points and identify system imbalances or performance losses.
Remote Measurement
The Bluetooth range of up to 100 metres allows readings to be viewed from a convenient location, reducing the need to remain directly beside the measuring point.
Measurement Documentation
The Testo Smart App can store readings and create reports containing customer details, photographs and comments. This is useful for service records, commissioning reports and maintenance documentation.
D. Suitable Buyers
The Testo 115i Smartphone Clamp Thermometer is suitable for:
- HVAC service technicians
- Refrigeration engineers
- Air-conditioning installation contractors
- Heating system technicians
- Chiller maintenance professionals
- Cold storage maintenance teams
- Heat pump service engineers
- Facility management companies
- Building maintenance contractors
- Refrigeration equipment manufacturers
- Commercial kitchen equipment technicians
- Supermarket refrigeration service companies
- Industrial maintenance departments
- Energy auditors
- Technical training institutes
- Test and measurement instrument suppliers
Frequently Asked Questions
1. What does the Testo 115i measure?
The Testo 115i measures the surface temperature of pipes and pipelines using an integrated NTC temperature sensor.
2. What is the temperature range of the Testo 115i?
The measuring range is from minus 40 °C to 150 °C.
3. What pipe sizes can be measured?
The clamp is suitable for pipelines with diameters from 6 to 35 millimetres.
4. Does the Testo 115i have a built-in display?
No. A compatible smartphone or tablet running the Testo Smart App is used as the display and operating interface.
5. How does the instrument connect to a smartphone?
It connects through Bluetooth and transmits measurement data to the Testo Smart App.
6. What is the Bluetooth range?
The Bluetooth range is up to 100 metres under suitable operating conditions.
7. Can the Testo 115i measure flow and return temperatures?
Yes. It can measure pipe surface temperatures on the flow and return lines of heating systems. Two instruments may be used for simultaneous measurement.
8. Can it calculate superheating and subcooling?
The Testo 115i supports superheating and subcooling calculations when used together with a Testo 549i pressure measuring instrument and the Testo Smart App.
9. Can the Testo 115i be used for refrigeration servicing?
Yes. It is designed for installation, servicing and troubleshooting work on refrigeration and air-conditioning systems.
10. Is it suitable for heating systems?
Yes. It can be used to measure flow and return temperatures in heating circuits.
11. Can temperature changes be viewed graphically?
Yes. The Testo Smart App can display temperature progression as a graph, allowing technicians to identify changes quickly.
12. Can measurement reports be generated?
Yes. Measurement values can be displayed as graphs or tables and exported in PDF or Excel format. Users can also add photographs and comments.
13. Which mobile devices are compatible?
The datasheet specifies compatibility with iOS 11 or newer and Android 6 or newer. The mobile device must support Bluetooth 4.0.
14. What batteries does the Testo 115i use?
It operates using three AAA batteries.
15. What is the expected battery life?
The stated battery life is approximately 150 hours, depending on operating conditions and usage.
16. Is the Testo 115i suitable for A2L and A3 refrigerants?
Yes. The technical data identifies the instrument as compatible with A2L and A3 refrigerant applications.
17. What is included with the instrument?
The Testo 115i is supplied with batteries and a calibration protocol.
18. Is the Testo 115i suitable for non-contact temperature measurement?
No. It is a contact-type clamp thermometer. The clamp must be attached directly to the pipe surface to measure temperature accurately.