The WIKA TI.ST measures temperature through contact with a metal surface. Its bimetal coil responds to temperature changes and moves the dial pointer to provide a local reading.
Unlike insertion thermometers, the TI.ST has no probe stem or threaded process connection. Two built-in magnets attach the instrument to a ferrous metal surface, allowing convenient installation and repositioning without drilling or modifying the equipment.
Key Features
- Measuring principle: Bimetal coil.
- Mounting method: Dual magnets for attachment to ferrous metal surfaces.
- Dial size: 2 inches.
- Accuracy: ±2% of full-scale value.
- Instrument depth: Approximately 1/2 inch.
- Case material: Steel.
- Dial: Polished aluminum with black markings.
- Pointer: Aluminum with a matte black finish.
- Window: Glass.
- Temperature scales: Fahrenheit or Celsius, depending on the selected model.
- Power supply: Not required.
- Reset function: No reset adjustment.
Suitable Applications
- Ovens and furnaces: Monitoring temperatures on compatible external metal surfaces.
- Boilers: Checking surface temperatures on suitable metal components.
- Process pipelines: Measuring pipe surface temperature without inserting a sensor into the process.
- Electric motors: Monitoring accessible metal surfaces for temperature changes.
- Generators: Local surface-temperature checks during operation.
- Maintenance inspections: Temporary temperature checks on ferrous equipment surfaces.
- Industrial equipment: General-purpose surface temperature monitoring where direct contact and magnetic mounting are suitable.
Technical Highlights & Selection Considerations
The TI.ST is designed for surface temperature measurement, so confirm these points before ordering:
- Temperature range: Choose the scale that covers the expected surface temperature.
- Mounting surface: The magnets require a ferrous metal surface. They will not reliably attach to aluminum, copper, plastic, or other non-ferromagnetic materials.
- Surface contact: Ensure the mounting area is clean, reasonably flat, and suitable for stable contact.
- Measurement expectations: Surface readings can differ from internal process temperature because of insulation, ambient air, thermal contact, and heat loss.
- Dial readability: Confirm that the 2-inch dial is suitable for the viewing distance and installation location.
- Operating conditions: Check whether the selected temperature range and glass-window construction suit the actual environment.
Available range options listed by WIKA:
- 0 to 250 °F — model code ST206MW
- 0 to 500 °F — model code ST228MW
- −20 to 120 °C — model code ST106MW
- −70 to 70 °C — model code ST101MW
FAQ
Q1: What is the WIKA TI.ST used for?
It measures surface temperature on compatible metal equipment, including ovens, boilers, process lines, motors, and generators.
Q2: Does the TI.ST require a process connection or probe insertion?
No. It is mounted directly onto a suitable metal surface using its dual magnets.
Q3: Can the TI.ST attach to stainless steel?
It depends on the stainless steel grade and its magnetic properties. Confirm that the actual mounting surface attracts the magnets securely before relying on the instrument.
Q4: What accuracy does the TI.ST provide?
WIKA specifies an accuracy of ±2% of full scale. It is intended for general surface-temperature indication rather than high-precision measurement.
Q5: Can the TI.ST measure the temperature inside a pipe or vessel?
No. It measures the external surface temperature. If the application requires direct measurement of the internal fluid temperature, consider an insertion thermometer or an appropriate sensor assembly.
