LF-TD 150 measuring transducer with advanced temperature range for humidity, temperature, dew point and absolute moisture


LF-TD 150
measuring transducer with advanced temperature range


Industrial measuring transducer for humidity and temperature

Moisture transmitter for temperatures of up to a maximum of 150°C for laboratory, climate control and drying technology, wood processing industry, food and animal feed industry, building industry, printing and paper industry, agriculture, biotechnology and pharmaceutical industry.

Article no. 12667 LF-TD 150 Industrial measuring transducer for humidity, temperature, dew point and absolute moisture


In the manufacturing process, further processing, storage and transport, the exact determination of moisture and temperature becomes increasingly important. Only an accurate moisture monitoring can guarantee high product quality.

The LF-TD transmitters of Schaller measurement instrumentation, with its robust and easy to mount aluminium housing, are best suited for all applications in this field. A robust sensor tube of 750 mm length (Ø 12mm) made of stainless steel with screwed sensor cap enlargens the application potential of the LF-TD 150 humidity and temperature transmitter. Diverse sensor caps (steel sinter, bronze sinter, plastic with or without filter, …) are available optionally.

s standard version, the moisture and temperature values are output via analogue 4-20mA power output. Alternatively, for the LF-TD 150 humidity and temperature transmitter also other interfaces like for example RS232, Profinet, Modbus or USB can be used.

The optionally available display showing the current moisture and temperature value is another add-on enlargening the application possibilities of the transmitter.

Two optional relay outputs enable the direct control of an alarm or air conditioning, for example. These switching outputs can be configurated freely directly at the LF-TD 150 humidity transducer (switch-points, hysteresis).

Thanks to the enclosed 1.9 meter connection cable with 5-pole moulded and robust sensor connector (on the sensor side), the sensor can be connected to existing plants without any difficulty. The other end of the cable is equipped with wire end ferrules for the easy connection to the control box or something similar.

The used capacitive moisture sensor ensures long-time stable and accurate measuring values and is resistant to normal pollution and a lot of chemicals. Furthermore, the sensors used in the LF-TD transmitters are characterised by rapid conditioning.

The excellent measuring accuracy of the LF-TD series is guaranteed by a factory-calibration at six humidity points. On request a calibration certificate can be provided.

Technical drawing

LF-TD 150 measuring transducer with advanced temperature range for humidity, temperature, dew point and absolute moisture

Technical data

article no.12667
Measuring range
Relative air humidity0 to 100 %
Temperature-20°C to +150°C
Relative air humidity4 - 20mA
Scaling air humidity 0 to 100 %
Temperature4 - 20mA
Scaling temperature-20°C to +150°C
working resistance< 500 Ohm (UB 24V)
accuracy factory calibration  
Relative air humidity10 to 90%:  ± 2,0 %
Temperature+10 to +60°C:  ± 0,3 °C
Operating temperature
Sensor head-20°C to +150°C
electronics-20°C to +85°C
Power supply
Voltage24 VDC  (12 to 29VDC)
Current consumption approx.approx. 18 mA 1)
Dimensions and others:
Dimensions sensor headØ 12 x 750 mm
Material sensor head:stainless steel
Sensor cap:stainless steel sinter
dimensions electronics housing70 x 32 x 120 mm
Material electronics housinganodised aluminium
protection class
electronics housing
IP 54
Electric connectionsensor plug
displayarticle no. 12662
relay output for moisturearticle no. 12806
RS232 interfacearticle no. 12807
USB interfacearticle no. 12808
Bluetooth (only with USB
interface article no. 12808)
article no. 12627
Profinet interface article no. 12809
Ethernet interfacearticle no. 12810
Modbus interfacearticle no. 12811

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LF-TD 150 measuring transducer with advanced temperature range for humidity, temperature, dew point and absolute moisture

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