Vaisala TMI110 Immersion Temperature Transmitter
The Vaisala TMI110 is a high-accuracy immersion temperature transmitter designed for measuring cooling-water and heating-water temperatures in HVAC and building-automation systems.
With temperature accuracy of ±0.1 °C at +20 °C and a typical response time of less than eight seconds, the TMI110 supports precise and responsive control of chilled-water systems, cooling plants, air-handling units and data-centre cooling infrastructure.
The stainless-steel probe can be installed in a thermowell for liquid-temperature measurement or mounted in a ventilation duct using a suitable installation flange for air-temperature measurement.
Why Choose the Vaisala TMI110?
- High Measurement Accuracy: Provides temperature accuracy of ±0.1 °C at +20 °C for dependable HVAC and cooling-system control.
- Fast Response: A typical T63 response time of less than eight seconds allows the control system to react quickly to temperature changes.
- Liquid and Air Measurement: Suitable for chilled water, heating water and air-temperature measurements in ventilation ducts.
- Pt1000 Sensor: Uses a Pt1000 RTD Class A temperature sensor manufactured according to IEC 60751.
- Flexible Outputs: Available with loop-powered 4–20 mA output or digital Modbus RTU communication.
- Industrial Protection: The IP65 and NEMA Type 4 enclosure is suitable for demanding mechanical and plant-room environments.
- Traceable Calibration: Each transmitter is individually adjusted and supplied with a traceable one-point calibration certificate.
- Multiple Probe Lengths: Stainless-steel probes are available in several lengths to accommodate different pipe and duct dimensions.
TMI110 for Data-Centre Cooling Systems
Cooling is a major contributor to data-centre energy consumption. Accurate measurement of chilled-water supply and return temperatures helps operators maintain reliable server-room conditions while improving cooling efficiency.
The TMI110 can be installed at important points throughout the chilled-water and HVAC system to provide accurate measurements to the building management system, data-centre infrastructure management system or cooling controller.
Data-Centre Measurement Locations
| Measurement Location | Purpose |
|---|
| Chilled-Water Supply |
Confirms the water temperature delivered to the data-centre cooling equipment |
| Chilled-Water Return |
Measures the temperature of water returning from the cooling load |
| Cooling Distribution Unit |
Supports precise control of cooling delivered to data halls or liquid-cooled racks |
| Computer Room Air Handler |
Monitors cooling-coil water temperature for responsive air-temperature control |
| Computer Room Air Conditioner |
Provides chilled-water temperature feedback for cooling regulation |
| Chiller Plant |
Supports cooling-production monitoring and plant-efficiency analysis |
| Heat Exchanger |
Monitors temperature on the primary and secondary sides of the cooling circuit |
| Ventilation Duct |
Measures supply-air or return-air temperature using an appropriate mounting flange |
Improving Cooling Efficiency
- Supply and Return Temperature Difference: Installing TMI110 transmitters on both sides of the cooling circuit helps monitor the chilled-water temperature differential.
- Cooling-System Optimization: Accurate temperature measurements allow operators to reduce unnecessary overcooling while maintaining safe server conditions.
- Control-Loop Performance: The fast sensor response helps valves, pumps and cooling controllers react promptly to changing loads.
- Energy Performance Analysis: Temperature measurements can be combined with flow data to evaluate thermal load and cooling-system performance.
- Fault Detection: Unexpected supply or return temperatures can indicate valve, pump, heat-exchanger or cooling-coil problems.
TMI110 Measurement Performance
| Measurement Specification | Performance |
|---|
| Measured Parameter |
Temperature |
| Measurement Range |
-40 °C to +120 °C |
| Accuracy at +20 °C |
±0.1 °C |
| Temperature Dependence |
±0.01 °C per °C |
| Typical Response Time |
Less than 8 seconds, T63 at +20 °C |
| Temperature Sensor |
Pt1000 RTD Class A according to IEC 60751 |
| Factory Calibration Uncertainty |
±0.1 °C at +20 °C |
| Calibration |
Individual one-point traceable calibration with certificate supplied |
Available Output Options
| Output Version | Technical Details | Recommended Use |
|---|
| 4–20 mA |
Two-wire, loop-powered analog output |
Conventional building-management systems, PLCs and HVAC controllers |
| Modbus RTU |
Non-isolated RS-485 digital communication |
Modern building-automation systems and multi-device RS-485 networks |
4–20 mA Electrical Specifications
| Feature | Specification |
|---|
| Analog Output |
4–20 mA, loop powered |
| Loop Resistance |
0–600 Ω |
| Supply Voltage at 0 Ω Load |
10–28 V DC |
| Supply Voltage at 600 Ω Load |
20–28 V DC |
Modbus RTU Electrical Specifications
| Feature | Specification |
|---|
| Digital Interface |
RS-485, non-isolated |
| Communication Protocol |
Modbus RTU |
| Default Baud Rate |
19,200 bps |
| Default Serial Format |
No parity, 8 data bits and 2 stop bits |
| Line Termination |
No internal line termination |
| Supply Voltage |
10–28 V DC |
Operating Environment
| Environmental Specification | Operating Range |
|---|
| Probe Operating Temperature |
-40 °C to +120 °C |
| Electronics Operating Temperature without Display |
-40 °C to +60 °C |
| Electronics Operating Temperature with Display |
-5 °C to +60 °C |
| Storage Temperature without Display |
-40 °C to +60 °C |
| Storage Temperature with Display |
-5 °C to +60 °C |
| Protection Rating |
IP65 |
| NEMA Rating |
NEMA Type 4 |
Mechanical Specifications
| Feature | Specification |
|---|
| Probe Material |
Stainless steel |
| Probe Diameter |
6 mm |
| Available Probe Lengths |
50, 100, 150 or 200 mm |
| Maximum Terminal Wire Size |
1.5 mm² or AWG 16 |
| Housing Material |
Polycarbonate with 10% glass-fibre reinforcement |
| Housing Flammability Classification |
UL-V0 approved material |
| Standard Housing Colour |
White, RAL 9003 |
| Compliance |
CE and RCM |
Installation in a Water Pipeline
For chilled-water or heating-water measurement, the TMI110 probe should be installed in a compatible thermowell. The thermowell allows the transmitter to be removed for inspection or calibration without draining the complete pipeline.
- Correct Insertion Depth: Select a probe length and thermowell that place the sensing section sufficiently inside the water flow.
- Avoid Dead Zones: Do not position the thermowell in an area with stagnant water or poor circulation.
- Maintain Thermal Contact: Ensure that the probe is correctly seated inside the thermowell.
- Allow Service Access: Leave sufficient clearance to remove the probe and open the transmitter enclosure.
- Protect the Electronics: Position the enclosure away from direct heat sources and within its specified operating range.
Installation in a Ventilation Duct
The TMI110 can also measure supply-air or return-air temperature when installed in a ventilation duct using a suitable mounting flange.
- Install the probe where the air is properly mixed.
- Avoid locations directly after heating or cooling elements unless that temperature is the intended measurement.
- Select a probe length that places the sensing section within the main airflow.
- Seal the duct opening to prevent air leakage around the probe.
Applications Beyond Data Centres
- Commercial HVAC Systems: Chilled-water and heating-water temperature measurement.
- District Cooling: Supply and return temperature monitoring at heat exchangers and energy-transfer stations.
- Industrial Cooling: Cooling-water measurement for machines, processes and production equipment.
- Air-Handling Units: Cooling-coil and heating-coil water-temperature measurement.
- Ventilation Systems: Supply-air and return-air temperature monitoring.
- Energy Management: Temperature measurement used together with flow instruments for thermal-energy calculations.
- Building Automation: Accurate input for HVAC control, optimization and fault detection.
Related Data-Centre Measurement Products
For a complete overview of data-centre temperature, humidity, pressure and environmental monitoring, see our Vaisala Data Centre Environmental Monitoring Guide.
Selecting the Correct TMI110 Configuration
| Selection Item | Available Choice |
|---|
| Measurement Medium |
Liquid in a thermowell or air in a ventilation duct |
| Output |
Loop-powered 4–20 mA or Modbus RTU over RS-485 |
| Local Display |
Display or non-display model |
| Probe Length |
50, 100, 150 or 200 mm |
| Liquid Installation |
Select a compatible thermowell according to the pipe and process requirements |
| Duct Installation |
Select a compatible installation flange |
Vaisala TMI110 Supplier in Malaysia
Seacom Process Instruments supplies the Vaisala TMI110 immersion temperature transmitter in Malaysia for data centres, district-cooling systems, HVAC installations and building-automation projects.
Our team can assist with selecting the output type, display option, probe length, thermowell and installation accessories required for your chilled-water or air-temperature application.
Contact Seacom for a TMI110 configuration suitable for data-centre cooling, chilled-water supply and return monitoring, air-handling units and other high-accuracy HVAC applications.
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TMI110 Catalogue
- Immersion Temperature Transmitter TMI110
(288.52k)
