S+S Regeltechnik HYGRASGARD AFTF Series Operating Instructions, Mounting & Installation Download Page 10

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Calibratable outdoor humidity

⁄

temperature sensor

HYGRASGARD

AFF ⁄ AFTF

(± 2.0 % )

AFF - SD ⁄ AFTF - SD

(± 2.0 % ) and

AFF - 20 ⁄ AFTF - 20

(± 1.8 %) with

plastic sinter filter (optional metal sinter filter) or

AFF - 25 ⁄ AFTF - 25

(± 1.8 %)

with pluggable metal sinter filter;

terminal-box enclosure made of impact-resistant plastic,

with ⁄ without optional display

It measures the relative humidity and  ⁄ or temperature of the air and converts the measurand into a standard signal of 0  - 10 V or 4...20 mA. They
have four switchable temperature ranges and are applied in non-aggressive, dust-free atmospheres in refrigeration, air conditioning, ventilation and
clean room technology. Relative humidity (in % r. H.) is the quotient of water vapour partial pressure divided by the saturation vapour pressure at the
respective gas  temperature. These measuring transducers are designed for exact detection of humidity. A digital long-term stable sensor is used as
measuring element for humidity measurement. Fine adjustment by the user is possible.

TECHNICAL DATA

Power supply:

24 V AC (± 20 %); 15...36 V DC for U variant
15...36 V DC for I variant, depending on working resistance, residual ripple stabilised ± 0.3 V

Working resistance:

(ohm) = (U

-14 V) ⁄ 0.02 A for I variant

Load resistance:

> 5 kOhm for U variant

Power consumption:

< 1.1 VA ⁄ 24 V DC ; < 2.2 VA ⁄ 24 V AC

Sensors:

digital humidity sensor with integrated temperature sensor,

low hysteresis, high long-term stability

Sensor protection:

AFF ⁄ AFTF, AFF - 20 ⁄ AFTF - 20, AFF - SD ⁄ AFTF - SD:
plastic

sinter filter, Ø 16 mm, L = 35 mm, exchangeable

(optional metal

sinter filter, Ø 16 mm, L = 32 mm)

AFF - 25 ⁄ AFTF - 25:

pluggable

measuring head

(probe) with

metal

sinter filter, Ø 16 mm, L = 88.5 mm, exchangeable

HUMIDITY

Measuring range, humidity:

0...100 % r. H. (output corresponding to 0 -10 V or 4...20 mA)

Operating range, humidity:

0...95 % r. H. (without dew formation)

Permissible air humidity:

< 95 % r. H., non-precipitating air

Deviation, humidity:

AFF ⁄ AFTF, AFF - SD ⁄ AFTF - SD:

typically

± 2.0 %

(20...80 % r. H.) at +25 °C, otherwise ± 3.0 %

AFF - 20 ⁄ AFTF - 20, AFF - 25 ⁄ AFTF - 25:

typically

± 1.8 %

(10...90 % r. H.) at +25 °C, otherwise ± 2.0 %

Output, humidity:

0 -10 V for U variant
4...20 mA for I variant, see load resistance diagram

TEMPERATURE

Measuring range, temperature:

multi-range switching

(see table)

–35...+35 °C; –35...+75 °C; 0...+50 °C; 0...+80 °C

(output corresponding to 0 -10 V or 4...20 mA)

Ambient temperature:

AFF ⁄ AFTF, AFF - 20 ⁄ AFTF - 20, AFF - 25 ⁄ AFTF - 25:

storage –35...+85 °C; operation – 30...+80 °C, non-precipitating

AFF - SD ⁄ AFTF - SD:

storage –35...+85 °C, operation – 30...+70 °C, non-precipitating

Deviation, temperature:

± 0.2 K at +25 °C

Output, temperature:

0 -10 V or 4...20 mA or Ohm value

Electrical connection:

2-, 3-, or 4-wire connection (see connecting diagram), 0.14 - 1.5 mm², via terminal screws on circuit board

Enclosure:

plastic, UV-stabilised, material polyamide, 30 % glass-globe reinforced,
with quick-locking screws (slotted ⁄ Phillips head combination),
colour traffic white (similar to RAL 9016), enclosure cover for display is transparent!

Enclosure dimensions:

AFF ⁄ AFTF, AFF - 20 ⁄ AFTF - 20, AFF - 25 ⁄ AFTF - 25:

126 x 90 x 50 mm (Tyr 2)

AFF - SD ⁄ AFTF - SD:

72 x 64 x 37,8 mm (Tyr 1

without

display)

72 x 64 x 43,3 mm (Tyr 1

with

display)

Cable gland:

M 16 x 1.5, including strain relief, exchangeable, max. inner diameter 10.4 mm