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LPN-H - Relative Humidity & Temperature Transmitter





The Intech LPN-H is a complete relative humidity and temperature sensing module, with two loop powered 4~20mA output signals, representing 0~100%RH and 0~100ºC.

Two versions are available:

  1. Wall mount.
  2. Duct mount.

Both versions come complete in an industry standard aluminium connection head.

The digital relative humidity sensor and temperature compensating sensor protrude from the head inside a protective cap. This cap allows air to circulate to the sensors.


LPN-H Features
SHT25 Sensor
LPN-H Ordering Info
LPN-H Calibration System

  • NEW Sensirion SHT25 Digital Humidity Sensor.
  • Long Term Stability.
  • Fast response: 4 seconds from 0 to 100%RH under ideal conditions.
  • Dual 4~20mA Outputs.
  • %RH Temperature Compensated Linear Output.
  • Pt100 RTD Sensor.
  • Temperature Output 0~100ºC (0~200ºF optional).
  • Temperature Output Linearised.
  • Very Compact Design.
  • High Accuracy.
  • Low Cost.
  • Easy to Install.
  • Reverse Polarity Protection.
  • Wide Power Supply Range.
  • Rugged and reliable.


 SHT25 sensor

SHT25 - Digital Humidity Sensor [RH&T] 

High-precision version of the world's smallest digital humidity sensor.

The new SHT25 is the high-end model of Sensirion's new generation of digital humidity and temperature sensors. Compared to the standard version, an even higher level of precision (1.8% RH and 0.2°C typical values) can be guaranteed. The fully calibrated and reflow solderable SHT25 is characterized by the same unique features than the humidity sensor SHT21. It does contain the same newly designed sensor chip that is encapsulated in a DFN 3-0 package of 3 x 3 x 1.1 mm. The complete overmolding - with the exception of the humidity sensor area - protects the capacitive humidity sensor against external impact and facilitates excellent long-term stability.

Output  I2C digital 
Energy consumption  3.2uW [at 8 bit, 1 measurement/s] 
RH operating range 0 - 100% RH
T operating range -40 - +125°c 
RH response time 8 sec [tau 63%]


Maximal accuracy limits for relative humidity and temperature

Sensirion Humidity SHT25 diagram RH 

 Sensirion Humidity SHT25 diagram T



Order Number   Description
 LPN-H-W [rev 1]  Wall Mount, 0~100%RH Transmitter, 0~100ºC Transmitter.
 LPN-H-D [rev 1]  220mm Duct Mount, 0~100%RH Transmitter, 0~100ºC Transmitter.
 LPN-H-F  100mm Flange for LPN-H-D.


Order Number   Description  
LPN-H-75  Calibration canister with 75% RH salt solution. LPN H Calibration Canister
LPN-H-43  Calibration canister with 43% RH salt solution.
LPN-H-33  Calibration canister with 33% RH salt solution.

Manufacturer: Intech

Aegis Sales & Service is Australia's leading supplier of Portable and Fixed Gas Detection, Lone Worker, Height Safety, Confined Space Equipment and process Instrumentation. We also specialise in the sale of breathalysers, drug testing kits and general safety equipment including fire safety, first aid, rescue equipment plus plenty more. Our versatile service team can carry out calibrations, inspection and maintenance of portable and fixed gas detectors, height and roof safety equipment, confined spaces rescue equipment, breathalysers, temperature/process control equipment and many other items in either our workshop or onsite by arrangement. If you're in need for something temporary we hire out a range of equipment for short and long term use. Need something built? We create and design custom fabrications in our workshop to help with all your safety needs.


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