GHM specializes in measurement and control technology - air humidity sensors

GHM Messtechnik is a new group of four companies, Greisinger, Honsberg, Martens and Imtron, integrated as a research, design and manufacturing company for electronic equipment with thousands of products in five main categories. ghm group, offers a wide range of measurement technology for the most diverse fields of application from sensors and electronics for industrial use to environmental measurement technology, as well as laboratory and handheld measurement equipment, even extending to data acquisition, equipment of the highest precision, first-class quality and excellent price-performance ratio. They use their technology centre to create tailor-made solutions for their customers. Their more than 40 experts combine their expertise in a multidisciplinary team to quickly and flexibly develop customised solutions to meet customer requirements, joint innovations that are unique in the measurement technology industry! High quality workmanship, the best materials and consistently high measuring accuracy are as much a part of the advantages of their measuring devices as their durability and resistance even in harsh environments.

Air humidity sensors
This device measures the relative humidity and temperature of air or non-corrosive/non-ionising gases. From this value other values can be derived and displayed than the relative humidity.

Product parameters
Display range humidity
Relative air humidity: 0.0 - 100.0% relative humidity
Wet bulb temperature: -27.0 - 60.0°C (or -16.6 - 140.0°F)
Dew point temperature: -40.0-60.0°C (or -40.0-140.0°F)
Enthalpy: -25.0,999.9kJ/kg
Mixing ratio (atmospheric humidity): 0.0-640.0 g/kg
Absolute humidity: 0.0-200.0 g/m3
Recommended humidity measurement range
Standard: 20.0 - 80.0% relative humidity
Humidity sensor operating range: option "high humidity": 5.0 - 95.0% RH
Range temperature: -40.0 to 120.0°C or -40.0 to 248.0°F
Accuracy display
Output signal: (at a nominal temperature of 25°C) Relative air humidity: ±2.5% RH (within the recommended measurement range)
Temperature: ±0.4%, ±0.2°C, ±0.2% FS of measured value
Medium: non-corrosive gas
Sensor: capacitive polymer humidity sensor and Pt1000
Temperature compensation: automatic
Frequency: per second
Adjustment: digital offset and scale adjustment for humidity and temperature
Min/max memory: storage of min and max measured values
Housing: ABS (IP65, except sensor head)
Dimensions: 82x80x55mm (without elbow-type plug and sensor tube)
For option "Kabel": Sensor head diameter 14mm*68mm, 1m Teflon cable, high humidity sensor
Mounting: Hole for wall mounting (in the housing - accessible after removal of the cover)
Mounting distance: max. 50x70 mm. Shaft diameter of mounting screws 4mm
Electrical connection: Elbow type plug in accordance with DIN 43650 (IP65)
Maximum value wire cross section: 1.5mm², wire/cable diameter 4.5 to 7mm
Battery compatibility: The device complies with the basic level of protection specified in the regulations of the approximation committee of the Member States' legislation on electromagnetic compatibility (2004/108/EG).
Additional error according to EN 61326-1:2006: <1% FS. When connected, the long leads must be protected against voltage surges by adequate measures.
Scaling: display value via input 4mA (0V respectively) and 20mA (1V/10V respectively) output, both freely scalable
Connection: 4-20 mA (2-wire) voltage (3/4-wire)
Auxiliary energy: 4-20 mA: Uv=12-30V DC
0-1V: Uv=12-30 volts DC max. 10mA
0-10V: Uv=18-30V DC max. 10mA
Impedance: 4-20 mA: RA (ohms) < (UV-12V)/0,02A)
Example: For Uv=18V, RA<(18V-12V)/0.02A => RA<300 ohms
Allowable load: 0-1 (10) V: RL (Ohm) > 3000Ohm

Applications
Indoor climate monitoring
Storage room monitoring