Humilink Digital Transmitter

The Humilink Series devices are versatile Digital Transmitters designed to provide precise relative humidity and temperature measurements. They offer output signals of 4–20 mA and/or 0–1 V DC, with a 2-wire loop-powered configuration for seamless integration with humidity and temperature indicators.

These transmitters are widely used in various applications, including HVAC systems, food processing, pharmaceutical storage, and stability chambers. An optional LCD display allows for Relative humidity and Temperature data monitoring with refresh rate of 3 seconds. The compact design and snap-fit enclosure ensure quick and easy installation for the intended application.

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Category: Data Loggers

Features

Highly Accurate Humidity & Temperature measurement
Display option available
Resolution of 0.01 for Display & storage
Output options to choose from 4-20 mA ; 0-1 V
Enclosure with vents-allows airflow across the sensor for Improved accuracy
Easy Installation with Snap fit Back cover

Specification

General
Model/Series	HL3x series (4-20 mA) HL4x series (0-1 Volt)
Display	Yes (Optional); LCD Display showing Temperature and Humidity reading with measurement unit
Display Resolution	0.01 °C & %RH
Unit of Measurement	Data in degree centigrade °C
Integrated Sensor	Solid State MEMS Sensor*
	Temperature	Relative Humidity
Operating Range	0 to 60 °C	0 to 100 %RH (Non-condensing)
Accuracy at 25 °C	± 0.5 °C ( 10 to 40 °C) ± 0.7 °C otherwise	± 2 %RH (20 to 80 %RH) ± 3 %RH otherwise
T₆₃Response Time	T90 < 5 -30 Seconds	< 8 seconds
Long-Term Drift	< 0.02 °C per year	< 0.25 %RH per year
Calibration	Each device accompanies NABL (ISO/IEC 17025) traceable certificate
Note: *Prolonged operation outside the recommended temperature operating conditions and/or at >80%RH with temperature in the higher recommended operating range can result in a shift of sensor reading, with slow recovery time. Note care needs to be taken when measuring RH at <0℃ due to potential for frost.
Environmental Specification
Temperature during Transportation and Storage – Device inactivated	5 ˚C to 60 ˚C
Temperature during operation	5 ˚C to 60 ˚C (EN 12830:1999 Table 3, Climatic Type A)
Humidity During Transportation, Storage and usage	5 to 95% RH non-condensing
Input-Output Specifications
Output analogue signal	4-20 mA, 0-1 Volt
Warm-up time	< 10 sec
Power Supply	10 – 28 V DC
Current consumption	2 x 20 mA max
Physical Characteristics
Overall Dimension (L x W x H) mm	86 x 86 x 25.5 mm
Weight	Approximate 100 gms
Mounting Type	Wall Mount
Enclosure Material	ABS Plastic UL94 V-0
Enclosure IP Rating	IP20
Standards
IP Rating	IP 20
RoHS	Compliant (EU directive 2011/65/EU)

Humidity Digital Transmitter
Model No.	Output
HL30 (Without Display)	4-20 mA
HL31 (With Display)	4-20mA
HL40 (Without Display)	0-1 V
HL41 (With Display)	0-1V

# Feature depends on the options selected, please refer to order code; Specifications are subjected to change without notice.