Kobold AFS-G1 Manual de usuario

Operating Instructions

for

Hygrostat

Model: AFS-G1

AFS-G1

page 2 AFS-G1 K04/1019

1. Contents

1.Contents ........................................................................................................ 2

2.Note .............................................................................................................. 3

3.Instrument Inspection .................................................................................... 3

4.Regulation Use ............................................................................................. 3

5.Operating Principle ........................................................................................ 4

6.Mechanical Connection ................................................................................. 5

7.Electrical Connection .................................................................................... 6

8.Operation ...................................................................................................... 7

8.1.Calibration ............................................................................................ 7

9.Maintenance ................................................................................................. 8

9.1.Cleaning Process ................................................................................. 8

10.Technical Information .................................................................................... 9

11.Dimensions [mm] ........................................................................................ 10

12.EU Declaration of Conformance ................................................................. 11

Manufactured and sold by:

Kobold Messring GmbH

Nordring 22-24

D-65719 Hofheim

Tel.: +49(0)6192-2990

Fax: +49(0)6192-23398

E-Mail: [email protected]

Internet: www.kobold.com

AFS-G1

AFS-G1 K04/1019 page 3

Note

Please read these operating instructions before unpacking and operating the unit,

and follow the instructions precisely as described herein.

The instruction manuals on our website www.kobold.com are always for currently

manufactured version of our products. Due to technical changes, the instruction

manuals available online may not always correspond to the product version you

have purchased. If you need an instruction manual that corresponds to the

purchased product version, you can request it from us free of charge by email

([email protected]) in PDF format, specifying the relevant invoice number and

serial number. If you wish, the operating instructions can also be sent to you by

post in paper form against an applicable postage fee.

The devices are only to be used, maintained and serviced by persons familiar

with these operating instructions and with any applicable regulations concerning

procedural safety and accident prevention.

When installed in machines, the measuring unit should be used only then when

the machines fulfil the EC-machine guide lines.

3. Instrument Inspection

Instruments are inspected before shipping and sent out in perfect condition. In

case of damage, please inform your parcel service/ forwarding agent

immediately, as they are responsible for damage during transit. Should damage

to a device be visible, we recommend a thorough inspection of the delivery

packing

Scope of delivery:

 Hygrostat model: AFS-G1

4. Regulation Use

Any use of the Hygrostat, model: AFS-G1, which exceeds the manufacturer’s

specification, may invalidate its warranty. Therefore, any resulting damage is not

the responsibility of the manufacturer. The user assumes all risk for such usage.

AFS-G1

page 4 AFS-G1 K04/1019

5. Operating Principle

The Hygrostat AFS-G1 serves as a two-position controller to regulate relative

humidity indoors or in air ducts.

The humidity sensing element in the sensor comprises several strips of plastic

fabric, each with 90 fibres of 3 µm diameter. These plastic fibres undergo a

special process to acquire hygroscopic properties, meaning that they will absorb

and release humidity. The molecular structure of the fibres changes when they

absorb water, giving rise to a measurable change in length. The length of the

plastic fibres is thus a measure of the relative humidity.

The swelling effect, acting primarily in longitudinal direction, is transferred over a

suitable lever system to a microswitch with an extremely small changeover

movement.

The measuring element reacts quickly and accurately to the change in air

humidity. The setpoint is set with the setpoint button so that the microswitch is

actuated by the lever system when the humidity setpoint is reached.

The special treatment of the measuring element ensures that its hygroscopic

properties remain stable, and that is sensitivity is maintained until destroyed by

external influence. Regeneration found in conventional instruments is not

required, but is also not damaging.

The harp-shaped measuring element is protected by a perforated probe tube and

is open to the housing. The Hygrostat is designed for use in unpressurised

systems.

The humidity measuring equipment is designed with a perforated sensor tube.

The humidity and temperature measuring elements are located in the interior of

the sensor tube. The humidity measuring element is arranged axially and the

temperature measuring element is seated sideways at the top or bottom between

the perforation holes.

The measurement accuracy depends on the degree of pollution of the element.

The humidity measuring element, in particular, loses its hygroscopic properties if

the surface is covered with grease, soot, smoke deposits, paint, resinous

substances, etc. By cleaning the elements, their function can be reproduced, but

only if no damage is caused by acids, alkaline solutions or other aggressive

substances (see Maintenance).

AFS-G1

AFS-G1 K04/1019 page 5

6. Mechanical Connection

 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 as much as

possible.

 The Hygrostat should be exposed to the flow of air.

 The installation position should be chosen to prevent condensed water from

entering the housing. The preferred installation position is "sensor vertically

pointing downwards" or "sensor horizontal". A blanking plate in the probe with

a 0,8 mm diameter hole prevents penetration of water in the installation

positions described above.

Installation position

AFS-G1

page 6 AFS-G1 K04/1019

7. Electrical Connection

When installing, ensure that there is sufficient over-current protection (e. g. fuse)

for the device. In addition, a separation device (e. g. plug or switch) must be

installed.

Fx Relative humidity of the air (process value)

Fw Adjusted humidity at the set value generator (set value)

If the relative humidity Fx falls below the adjusted set value Fw,

then contact 1/2 opens and contact 1/4 closes.

AFS-G1

AFS-G1 K04/1019 page 7

8. Operation

Attention! With restrictions in the upper range of operation, the

possible tolerances (measurement accuracy, switching difference

and temperature coefficient) should be observed when adjusting the

switch point.

8.1. Calibration

The Hygrostats are factory set at a room temperature of 23 °C and 50% relative

humidity, relative to the average air pressure of 430m NN.

If however, subsequent adjustment should be necessary, the following procedure

should be observed:

 Ensure that the ambient humidity and the ambient temperature are constant.

 If possible, use a psychrometer for checking (do not use equipment with

capacitive sensors).

 Leave the equipment to be checked for at least 1 hour in a constant checking

climate.

 The adjuster screw is at the end of the sensor - fixed with screw securing

lacquer. After removing the lacquer, the adjuster screw can be moved. A right-

hand rotation means that the measured value goes down, and with a left-hand

rotation the measured value goes up. After calibration, the adjuster screw

should again be secured.

Attention! Moving the adjuster screw nullifies the guarantee.

Important: The water absorption capacity of the air is influenced, amongst other

things, by the temperature. This is a physical law (which can be seen from the hx

diagram of Mollier). The higher the air temperature, the greater the volume of

water vapour that can absorbed up to saturation point (100 % RH). If a Hygrostat

is calibrated at a fluctuating air temperature, there will be an irregular, non-

homogeneous measured medium, resulting in calibration errors. The table below

shows the influence of the air temperature on air humidity. If, for example,

calibration occurs at an air temperature of 20 °C and 50 % RH, and at a

temperature fluctuation of just ±1 °K, then there will be a humidity fluctuation in

the measured medium (air) of ±3.2 % RH.

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

AFS-G1

page 8 AFS-G1 K04/1019

9. Maintenance

The measuring element is normally 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 that eventually form a water-repellent film over the sensor are

harmful. Such substances are resin aerosols, lacquer aerosols, smoke deposits,

etc. The water-resistant property of the measuring elements allows cleaning to be

carried out in water. Solvents cannot be used for this purpose. A light-duty

detergent is recommended, but any residue should always be washed out

thoroughly. A special process ensures that sensors have good long-term stability.

Regeneration is not necessary, but is also not harmful.

9.1. Cleaning Process

1. Dip the sensor tube into a receptacle containing clean water (20 °C) and, with

a gentle rotating motion, disperse the dirt deposits. If the dirt contains grease

deposits, it is recommended that a mild detergent be added to the water.

Attention! Do not brush or treat with any other cleaning utensils.

Only the sensor tube should be immersed - not the housing.

The sensor tube is open to the housing interior (0.8 mm hole)

2. As mild detergents are known to contain chemical substances, rinse carefully

after cleaning. Cleaning residue will impair the measured result.

3. Air drying. Where a measuring element is moistened with water, the device

indicates 100 % relative humidity. If necessary, it is possible to carry out

sensitive recalibration at the adjusting spindle at the end of the sensor. This

should only be done where there are large deviations. Slight movement of the

adjusting spindle of a wet element will cause the measured value in the dry

area to be change greatly. Here, there is an intensifying effect of the

linearisation (factor 6). Indications of 98 – 100 % relative humidity at the wet

element are adequate. The accuracy in the dry area must be determined

under normal climatic conditions.

Attention! The measuring element must not be dried using warm or

hot air (hair dryer).

Cleaning should be carried out for no longer than 10 minutes.

AFS-G1

AFS-G1 K04/1019 page 9

10. Technical Information

Physical details:

Measuring range

(scale range): 30...100 % RH

Measuring accuracy: >50 % RH: ±3.5 % RH

<50 % RH: ±4.0 % RH

Adjustment range

(range of operation): 35...100 % RH

measuring medium: air, non-pressurized, non-aggressive

Switch contact

Switching difference

(microswitch): approx. 3...6 % RH

Max. voltage: 250 VAC

(Caution! 250 V only on condition that there is

no build-up of condensate in the measuring

head – otherwise voltage arcing may result)

Switching capacity

of the changeover contact

Ohmic load (cos = 1): 15 A, 230 VAC

Inductive load (cos = 0,7): 2 A, 230 VAC

At low voltage: 100mA, 125 VAC

Contact material: silver

General

Allowable

ambient temperature: -30...+60 °C

Allowable

working temperature: 0...60 °C

Medium temp. Coefficient: -0,2% RH/K

(Relative to 20 °C and 50 % RH)

Allowable air speed: 8m/sec

with gauze protection (optional) 15 m/sec

Time constant

T63 at v=2 m/sec: 120 sec

Sensor length: 220 mm

Sensor material: high-grade steel

Mounting: Slots in the housing base for duct mounting

console for wall mounting (optional)

Mounting position: sensor vertically downwards or horizontally

Connecting terminals: for conductor cross sections 1.5 mm

Cable connection: via twist nipple M 20x1,5

Housing: ABS (Acrylnitril-Butadien-Styrol)

Type of protection: IP 54

Weight: approx. 0,7 kg

AFS-G1

page 10 AFS-G1 K04/1019

11. Dimensions [mm]

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