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Higrostat
Description of the hygrostat
The humidity measuring element, produced 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 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 | |
| Type Survey | ||
|---|---|---|
| Type | Order no. | Type of contact |
| HG |
420420171 | changeover contact: 1 x max. 5 A |
| HG-i | 420420181 | changeover contact: 1 x max. 5 A with internal scale |
Fx: actual value of the relative humidity
Fw: setpoint value of the rel. humidiy set at the adjusting knob
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.).
| 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.
