Vaisala TMI110 Immersion Temperature Transmitter


  • Accurate temperature measurement of liquids and air
  • Very fast response time
  • 1‑point traceable calibration (certificate included)
  • Analog (4 … 20 mA) and Modbusâ RTU output options
  • Installed in a thermowell for measurement in liquids
  • Optimized for building automation and HVAC process control

Dpstar is a leading supplier of environmental measurement sensors for temperature, relative humidity, pressure, dew point, CO2, and other environmental condition monitoring for industrial process application and research. Since the ’90s, we earned a reputation as a trusted partner to our clients through our commitment and dedication. We are an authorized distributor and supplier of measuring sensors solutions from renowned manufacturers Vaisala. Vaisala is a global leader in environmental and industrial measurement. Building on 80 years of experience, Vaisala provides observations for a better world. Vaisala is a reliable partner for customers around the world, offering a comprehensive range of innovative observation and measurement products and services.

The high-accuracy immersion temperature transmitter TMI110 is designed for measuring cooling/heating water temperatures in HVAC automation systems. TMI110 can also be used for air temperature measurements in air ventilation ducts. The transmitter has a fast response time, enabling precise and reliable control of HVAC systems. The TMI110 transmitter belongs to the Vaisala HUMICAP® Humidity and Temperature Transmitter Series HMDW110, which includes transmitters for duct mounting, IP65-rated wall transmitters, immersion temperature transmitters, and outdoor transmitters with integrated radiation shields.

Highly Accurate

The highly accurate TMI110 measures the temperature of liquid in cooling/heating systems, and the temperature of air in ventilation ducts. When measuring the temperature of liquid, the transmitter is installed in a thermowell. For air temperature measurements, the transmitter can be installed in a duct using a flange. Temperature is measured with a Pt1000 sensor element (class A). The high accuracy and quick response time of the measurement enable precise and reliable control of HVAC systems.

Fast Response Time

Fast response time of measurement is a top priority in the design of TMI110, enabling instant response in the control loop. Speed and reliability are key factors in the measurement of cooling and heating processes, thus the capabilites of TMI110 are a significant advantage. The transmitter is optimal for building automation and HVAC process control.

Traceable Accuracy

All TMI110 transmitters are individually adjusted and delivered with a traceable (ISO 9001) calibration certificate. If required later on, the transmitter can also be field‑calibrated using a Vaisala handheld meter or Vaisala Insight PC software.



Measurement Performance
Measurement range −40 … +130 °C (−40 … +266 °F)
Accuracy at +20 °C (+68 °F) ±0.1 °C (±0.18 °F)
Temperature dependence ±0.01 °C/°C
Response time (T63) at +20 °C
(+68 °F)
< 8 s typical
Temperature sensor Pt1000 RTD Class A, IEC 60751
Factory calibration uncertainty at
+20 °C (+68 °F)
±0.1 °C (±0.18 °F)
Operating Environment
Operating environment, probe −40 … +130 °C (−40 … +266 °F)
Operating environment, electronics −40 … +60 °C (−40 … +140 °F)
Storage temperature −40 … +60 °C (−40 … +140 °F)
IP rating IP65
NEMA rating NEMA 4
EU directives EMC Directive (2014/30/EU)
RoHS Directive (2011/65/EU)
amended by 2015/863
Electrical safety EN 61326‑1, industrial environment
EMC emissions CISPR 22 / EN 55022, Class B
Compliance marks CE, RCM
Inputs And Outputs
Devices Ordered With Analog Output
Outputs 4 … 20 mA, loop powered
Loop resistance 0 … 600 Ω
Supply voltage 20 … 28 V DC at 600 Ω load
10 … 28 V DC at 0 Ω load
Devices Ordered With Modbus Output
Interface RS‑485, not isolated, no line termination
Default serial settings 19200 bps N 8 2
Protocol Modbus RTU
Supply voltage 10 … 28 V DC
Mechanical Specifications
Probe material Stainless steel
Probe diameter 6 mm (0.24 in)
Probe length 100 mm (3.94 in)
Screw terminal wire size Max. 1.5 mm2 (AWG 16)
Standard housing color White (RAL9003)
Housing material PC + 10 %GF (UL‑V0 approved)
Spare Parts And Accessories
Conduit fitting + O‑ring (M16×1.5 / NPT1/2″) 210675SP
Conduit fitting + O‑ring (M16×1.5 / PG9, RE‑MS) 210674SP
Terminal block, blue 236620SP
USB cable for PC connection 219690
Connection cable for HM70 handheld meter 219980SP


Vaisala TMI110 Immersion Temperature Transmitter_DpstarGroup