Hygrostat HG MINI
  • Hygrostat HG MINI

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Manufacturer: Galltec Mela Sensortechnik

Hygrostat HG MINI

Description of the hygrostat
The humidity measuring element, produced by Galltec under the name Polyga®, consists of several synthetic
fabric bands each with 90 individual fibres with a diameter of 3μm. A special process gives the fibre
hygros-copic properties. The measuring element absorbs and desorbs humidity. The swelling effect, which
is predominantly in a lengthways direction, is carried via a suitable lever system to a microswitch with an
extremely small switching path. The measuring element reacts quickly and precisely to the change in air
humidity. By adjusting the setpoint value control knob, the lever system is engaged so that when the set air
humidity is reached the microswitch is activated. The fan-shaped measuring element is accomodated
inside the housing and must be protected against coarse dust, dirt and water. The sensors are designed
for pressureless systems. The mounting position should be chosen such that condensed water cannot
get into the interior of the housing. Any mounting position is possible, preferably with ventilation slots across
the direction of wind.

Application

The hygrostat type HG Mini is used as an on-off controller to control the relative air humidity. It can be used to control air humidifiers and dehumidifiers in offices and computer rooms. Other areas of use are storage of foodstuffs and luxury foods, cooling rooms for fruit and vegetables, greenhouses for gardening use, the textile industry, the paper and printing industry, the film industry and hospitals. The hygrostats can be used almost
anywhere that air humidity has to be regulated or monitored. The room hygrostat HG Mini-i is designed so that the adjusting knob and the scale are inside the housing. This makes unauthorized manipulation by third parties more difficult.

Technical Data:
- scale range 30...100 % rh
- measuring accuracy ±3%
- nge of operationy 35...100% rh
- switching difference (microswitch) ref. to 50%rh ok. 4% rh
max 250 VAC
 
- Max load
  Resistive load 5A 230VAC
  Max load for humidifying 2A
  Max load for dehumidifying 5A
  Inductive load* cosφ=0,8 0,2A 230VAC
  Inductive load* L/R=3ms 1A 50VDC
    0,5A 75VDC
- Min load 100mA, 20VDC/AC
- allowable ambient temperature 0...60°C
- medium temp. coefficient -0.2%/K rel.to 20°C and 50%rh
- allowable air speed 15 m/s
- half-life period at v=2m/sec 1,2min
- fixing slots in housing base
- mounting position optional, preferably ventilation slots at
right-angles to wind direction
     
- contacting connecting terminal in the case
- electromagnetic compatibility  
  Resistance zg. EN 50 082-2
  Emission zg. EN 50 081-2
- housing szary plastik
- dimensions 85x55x36mm
- protective system IP20
- weight ok. 0,06 kg

Dimenions[mm]
Type Survey
Type Order no. Type of contact
HG Mini 42042017 changeover contact: 1 x max. 5 A
HG Mini-i 42042018 changeover contact: 1 x max. 5 A
with internal scale
 
Scheme

Fx: actual value of the relative humidity
Fw: setpoint value of the rel. humidiy set at the adjusting knob

 
If the rel. humidity Fx (actual value) falls below the setpoint value Fw, contact 1/4 opens and contact 1/2 closes..
Mounting

Mounting
The hygrostat must not come into direct contact with water, e.g. splashed water when cleaning the climatic
chamber etc. The mounting location should be chosen so that a representative measurement of the air humidity can be guaranteed, i.e. the humidity readings at the mounting location should correspond to those in the room.
The hygrostat should be exposed to the flow of air.


Maintenance
The measuring element is maintenance-free in pure ambient air. Aggressive media containing solvent can cause
measuring errors and failure, depending on the type and concentration. As with almost all humidity measuring elements, deposits which eventually form a water-repellent fi lm over the measuring element are harmful (such as resin aerosols, lacquer aerosols, smoke deposits etc.).
 
Physical influence of temperature on the relative air humidity

 

  10[°c] 20[°c] 30[°c] 50[°c]
10%rh ±0,7%rh ±0,6%rh ±0,6%rh ±0,5%rh
50%rh ±3,5%rh ±3,2%rh ±3,0%rh ±2,6%rh
90%rh ±6,3%rh ±5,7%rh ±5,4%rh ±4,6%rh

It is thus of extreme importance that the temperature is constant for measurements of the relative air humidity. The air must be homogenous.

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Description of the hygrostat
The humidity measuring element, produced by Galltec under the name Polyga®, consists of several synthetic
fabric bands each with 90 individual fibres with a diameter of 3μm. A special process gives the fibre
hygros-copic properties. The measuring element absorbs and desorbs humidity. The swelling effect, which
is predominantly in a lengthways direction, is carried via a suitable lever system to a microswitch with an
extremely small switching path. The measuring element reacts quickly and precisely to the change in air
humidity. By adjusting the setpoint value control knob, the lever system is engaged so that when the set air
humidity is reached the microswitch is activated. The fan-shaped measuring element is accomodated
inside the housing and must be protected against coarse dust, dirt and water. The sensors are designed
for pressureless systems. The mounting position should be chosen such that condensed water cannot
get into the interior of the housing. Any mounting position is possible, preferably with ventilation slots across
the direction of wind.

Application

The hygrostat type HG Mini is used as an on-off controller to control the relative air humidity. It can be used to control air humidifiers and dehumidifiers in offices and computer rooms. Other areas of use are storage of foodstuffs and luxury foods, cooling rooms for fruit and vegetables, greenhouses for gardening use, the textile industry, the paper and printing industry, the film industry and hospitals. The hygrostats can be used almost
anywhere that air humidity has to be regulated or monitored. The room hygrostat HG Mini-i is designed so that the adjusting knob and the scale are inside the housing. This makes unauthorized manipulation by third parties more difficult.

Technical Data:
- scale range 30...100 % rh
- measuring accuracy ±3%
- nge of operationy 35...100% rh
- switching difference (microswitch) ref. to 50%rh ok. 4% rh
max 250 VAC
 
- Max load
  Resistive load 5A 230VAC
  Max load for humidifying 2A
  Max load for dehumidifying 5A
  Inductive load* cosφ=0,8 0,2A 230VAC
  Inductive load* L/R=3ms 1A 50VDC
    0,5A 75VDC
- Min load 100mA, 20VDC/AC
- allowable ambient temperature 0...60°C
- medium temp. coefficient -0.2%/K rel.to 20°C and 50%rh
- allowable air speed 15 m/s
- half-life period at v=2m/sec 1,2min
- fixing slots in housing base
- mounting position optional, preferably ventilation slots at
right-angles to wind direction
     
- contacting connecting terminal in the case
- electromagnetic compatibility  
  Resistance zg. EN 50 082-2
  Emission zg. EN 50 081-2
- housing szary plastik
- dimensions 85x55x36mm
- protective system IP20
- weight ok. 0,06 kg

Dimenions[mm]
Type Survey
Type Order no. Type of contact
HG Mini 42042017 changeover contact: 1 x max. 5 A
HG Mini-i 42042018 changeover contact: 1 x max. 5 A
with internal scale
 
Scheme

Fx: actual value of the relative humidity
Fw: setpoint value of the rel. humidiy set at the adjusting knob

 
If the rel. humidity Fx (actual value) falls below the setpoint value Fw, contact 1/4 opens and contact 1/2 closes..
Mounting

Mounting
The hygrostat must not come into direct contact with water, e.g. splashed water when cleaning the climatic
chamber etc. The mounting location should be chosen so that a representative measurement of the air humidity can be guaranteed, i.e. the humidity readings at the mounting location should correspond to those in the room.
The hygrostat should be exposed to the flow of air.


Maintenance
The measuring element is maintenance-free in pure ambient air. Aggressive media containing solvent can cause
measuring errors and failure, depending on the type and concentration. As with almost all humidity measuring elements, deposits which eventually form a water-repellent fi lm over the measuring element are harmful (such as resin aerosols, lacquer aerosols, smoke deposits etc.).
 
Physical influence of temperature on the relative air humidity

 

  10[°c] 20[°c] 30[°c] 50[°c]
10%rh ±0,7%rh ±0,6%rh ±0,6%rh ±0,5%rh
50%rh ±3,5%rh ±3,2%rh ±3,0%rh ±2,6%rh
90%rh ±6,3%rh ±5,7%rh ±5,4%rh ±4,6%rh

It is thus of extreme importance that the temperature is constant for measurements of the relative air humidity. The air must be homogenous.

Less
Read more
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