Moisture and temperature sensor with polyga element
Moisture and temperature sensor with polyga element

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Manufacturer: Galltec Mela Sensortechnik

Moisture and temperature sensor with polyga element

Humidity Sensors - FG80... and Combined Sensors

Humidity and Temperature Sensors - TFG80... with Polyga® sensing element for measuring relative air humidity and temperature – for rooms and ventilation ducts.

Model Overview

Passive Sensors

FG80H Humidity Sensor
with Resistive Output up to 10 kΩ
TFG80H Humidity and Temperature Sensor
with Resistive Output up to 10 kΩ

Active Sensors

FG80J Sensor Humidity Sensor
0(4)...20mA or 0...10V DC for U=15...30V DC
TFG80J Humidity and Temperature Sensor
both outputs 0(4)...20mA
or 0...10V DC for U=15...30V DC
FG80AC Humidity Sensor
both outputs 0(4)...20mA
or 0...10V DC for U=24V AC
TFG80AC Humidity and Temperature Sensor
both outputs 0(4)...20mA
or 0...10V DC for U=24V AC
Description Sensor:
The "Polyga" measuring element manufactured by Galltec consists of several synthetic ribbons, each woven from 90 fibers with a diameter of 0.003 mm. In its original state, the fibers are not hygroscopic; this property is acquired only after a special process, after which the fibers are able to absorb moisture. The molecular structure of the individual fibers is arranged longitudinally. When water is absorbed, the molecular chain changes, resulting in a change in length. Water loss has the opposite effect on the fiber. If the fibers are in equilibrium with the air humidity, there is no absorption or release of water. In this case, the fiber length is constant and serves as an indicator of relative humidity.
If the measuring element is exposed to air with 100% relative humidity, a thin film of water forms on the element's surface (dew point). The physical effect is similar to immersing the measuring element in water. In this case, the element is saturated. This is an ideal point for calibrating or checking the sensor. The sensing element is waterproof. Once hygroscopic, the Galltec element remains stable until damaged by external influences. Regeneration of the fibers is not required, although such a procedure will not harm the sensor.

Sensor Structure
The expansion of the fibers (primarily longitudinally) is detected by the electronic system and converted by the integrated signal preprocessing system into a standardized 0…20mA or 4…20mA or 0…10V signal. The fan-shaped sensing element, located outside the housing, is protected by a perforated sensor tube. The sensors are designed for non-pressurized systems. The unit should be installed in a location where condensed water vapor cannot enter the housing. The preferred position is "sensor vertically down" or "sensor horizontally." In such positions, a cover with a 0.8mm diameter hole will prevent water from entering.
TFG80 sensors have built-in temperature sensors (mostly Pt100) for simultaneous temperature measurements. Temperature readings are also converted to standardized signals 0…20mA or 4…20mA or 0…10V.

Sensor Response
According to the law of diffusion, there is a time delay before the fibers become saturated during water absorption. This is a decisive factor in determining the response time. Therefore, for a single 3μm diameter fiber, a short saturation time (a few seconds) can be changed. Empirical studies show that the use of bonded or woven fibers, as in the case of Galltec sensors, results in a longer saturation time. This is because individual fibers interact with each other as they absorb and expel water, and the associated moisture content is only detected later. Measurements have shown that at a wind speed of 2 m/s, the half-life is approximately 1.2 minutes. This translates to an actual response time of approximately 30-40 minutes.


Half-Time

POLYGA Humidity and Temperature Sensor - FG80, TFG80 - Half-Time

Thermal Behavior

POLYGA Humidity and Temperature Sensor - FG80, TFG80 - Thermal Behavior

A temperature of 80°C is given as the maximum value. Higher temperatures can occur for short periods. A possible result could be a change in the molecular structure, which causes a permanent error. The maximum temperature of 80°C only applies when no harmful substances (acids, solvents, etc.) are present in the medium.

Technical Data:
Physical Data

Humidity

Measuring Range
0…100%rh
Measurement accuracy
…>40%rh
±2.5%rh
…<40%rh
according to tolerance chart
Working scope
30…100%rh


Temperature

Working scope
-30…+80oC
Measurement accuracy
±0.5oC
Measured medium
air, unpressurized, non-aggressive
Permissible temperature at the housing
-20…+60°C
At the sensor
-40…+80oC
Average temperature coefficient
0.1%/K for 20oC and 50%rh
Regulation
for mean air pressure 430m NN
Permissible air speed
8m/s
Z cover
15m/s
Half-life for v=2m/s
1.2min
Sensor length; material
220mm; High-quality steel
Mounting
Holes in the housing base for duct mounting
(Prod. No. 20.009)
Mounting bracket on the wall
Mounting position
sensor vertically down; or horizontally
Terminal connections
for cables with cross-sections of 0.5mm22
Wire entries
Connector screw M20x1.5
Electromagnetic compatibility
Noise immunity
EN 50 082-2
Noise emissions
EN 50 081-2
Housing
ABS
Protection
IP64
Weight
ok. 0.4 kg


Electrical data for passive sensors

Humidity
Output 1
0-100 Ω linear 2-wire
0-200 Ω linear 2-wire
0-1000 Ω linear 2-wire
100-138.5 Ω linear 2-wire
5-100-5 Ω linear 3-wire
Permissible Load
1W
Maximum voltage
42V
Insulation resistance
10 MΩ


Temperature
Output 2 (TFG80H)
Pt100 ref. DIN EN60751
acceptable load
for air 1m/s i t=0.1K
2mA


Electrical data for active sensors

Humidity
Output 1
0-20mA or 0-10V 4-wire
or 4-20mA 2-wire (DC only)


Temperature
Output 2
0-20mA or 0-10V 4-wire
or 4-20mA 2-wire (DC only)
Supply voltage
15-30V DC or 24V AC ± 10%
Max. load for current output
500Ω
Min. Voltage output impedance
10kΩ
Internal power consumption
5mA, DC version
10mA, AC version
Temperature measurement range
see table
Linearity distortion
temperature output
<0.5%


Model Humidity Temperature Supply Voltage Conduction System Product Number
Measuring Range 1 Output 1 Measuring Range 2 Output 2
Passive Sensors Overview

FG80H

 0-100 %rh 0-100 Ω Max 42V 2-pin

44010100
0-100 %rh 0-200 Ω Max 42V 2-pin

44010200
0-100 %rh 0-1000 Ω Max 42V 2-pin

44010300
0-100 %rh 100-138.5 Ω Max 42V 2-pin

44010400
0-100 %rh 5-100-5 Ω Max 42V 3-pin

44010600

TFG80H

 0-100 %rh 0-100 Ω +5…+80oC Pt100 Max 42V 2-pin

44700150
0-100 %rh 0-200 Ω +5…+80oC Pt100 Max 42V 2-pin

44700250
0-100 %rh 0-1000 Ω +5…+80oC Pt100 Max 42V 2-pin

44700350
0-100 %rh 100-138.5 Ω +5…+80oC Pt100 Max 42V 2-pin

44700450
0-100 %rh 5-100-5 Ω +5…+80oC Pt100 Max 42V 3-pin

44700650
Overview of active sensors U=15…30V DC and/or 24V AC (20…28V AC)

FG80J
FG80AC

 0-100 %rh 0-20 mA 15 – 30V DC 3/4 - wires

44013000
0-100 %rh 0-20 mA 24V AC 3/4 - wires

44014200
0-100 %rh 0-10V DC 15 – 30V DC
24V AC		 3/4 - wires

44014700
0-100 %rh 4-20 mA 15 – 30V DC 2 - wires

44014800

TFG80J
TFG80AC

 0-100 %rh 0-20 mA 0…+40oC 0-20mA 15 – 30V DC 3/4 - wires

44513030
0-100 %rh 0-20 mA -30…+60oC 0-20mA 15 – 30V DC 3/4 - wires

44573030
0-100 %rh 0-20 mA -10…+90oC** 0-20mA 15 – 30V DC 3/4 - wires

44623030
0-100 %rh 0-20 mA 0…+100oC* 0-20mA 15 – 30V DC 3/4 - wires

44543030
0-100 %rh 0-20 mA 0…+40oC 0-20mA 24V AC 4 - wires

44514242
0-100 %rh 0-20 mA -30…+60oC 0-20mA 24V AC 4 – wires

44574242
0-100 %rh 0-20 mA -10…+90oC 0-20mA 24V AC 4 - wires

44624242
0-100 %rh 0-20 mA 0…+100oC* 0-20mA 24V AC 4 - wires

44544242
0-100 %rh 0-10V DC 0…+40oC 0-10V DC 15 – 30V DC
24V AC		 3/4 - wires

44514747
0-100 %rh 0-10V DC -30…+60oC 0-10V DC 15 – 30V DC
24V AC		 3/4 - wires

44574747
0-100 %rh 0-10V DC -10…+90oC 0-10V DC 15 – 30V DC
24V AC		 3/4 - wires

44624747
0-100 %rh 0-10V DC 0…+100oC* 0-10V DC 15 – 30V DC
24V AC		 3/4 - wires

44544747
0-100 %rh 0-20 mA 0…+40oC 0-20mA 15 – 30V DC 2 - wires

44514848
0-100 %rh 0-20 mA -30…+60oC 0-20mA 15 – 30V DC 2 - wires

44574848
0-100 %rh 0-20 mA -10…+90oC 0-20mA 15 – 30V DC 2 - wires

44624848
0-100 %rh 0-20 mA 0…+100oC* 0-20mA 15 – 30V DC 2 - wires

44544848

Special
FG80JPt100

 0-100 %rh 0-20 mA Pt100 resistance 15 – 30V DC 3/4 – wires

44703050
0-100 %rh 0-10V DC Pt100 resistance 15 – 30V DC
24V AC		 3/4 - wires

44704750
0-100 %rh 4-20 mA Pt100 resistance 15 – 30V DC 2 - wires

44704850
* attention to max. Temperature range ** suitable for the EDJ controller

Tolerance and humidity diagram

Tolerance and humidity diagram

Connection diagram for passive sensors with resistive output

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Humidity Sensors - FG80... and Combined Sensors

Humidity and Temperature Sensors - TFG80... with Polyga® sensing element for measuring relative air humidity and temperature – for rooms and ventilation ducts.

Model Overview

Passive Sensors

FG80H Humidity Sensor
with Resistive Output up to 10 kΩ
TFG80H Humidity and Temperature Sensor
with Resistive Output up to 10 kΩ

Active Sensors

FG80J Sensor Humidity Sensor
0(4)...20mA or 0...10V DC for U=15...30V DC
TFG80J Humidity and Temperature Sensor
both outputs 0(4)...20mA
or 0...10V DC for U=15...30V DC
FG80AC Humidity Sensor
both outputs 0(4)...20mA
or 0...10V DC for U=24V AC
TFG80AC Humidity and Temperature Sensor
both outputs 0(4)...20mA
or 0...10V DC for U=24V AC
Description Sensor:
The "Polyga" measuring element manufactured by Galltec consists of several synthetic ribbons, each woven from 90 fibers with a diameter of 0.003 mm. In its original state, the fibers are not hygroscopic; this property is acquired only after a special process, after which the fibers are able to absorb moisture. The molecular structure of the individual fibers is arranged longitudinally. When water is absorbed, the molecular chain changes, resulting in a change in length. Water loss has the opposite effect on the fiber. If the fibers are in equilibrium with the air humidity, there is no absorption or release of water. In this case, the fiber length is constant and serves as an indicator of relative humidity.
If the measuring element is exposed to air with 100% relative humidity, a thin film of water forms on the element's surface (dew point). The physical effect is similar to immersing the measuring element in water. In this case, the element is saturated. This is an ideal point for calibrating or checking the sensor. The sensing element is waterproof. Once hygroscopic, the Galltec element remains stable until damaged by external influences. Regeneration of the fibers is not required, although such a procedure will not harm the sensor.

Sensor Structure
The expansion of the fibers (primarily longitudinally) is detected by the electronic system and converted by the integrated signal preprocessing system into a standardized 0…20mA or 4…20mA or 0…10V signal. The fan-shaped sensing element, located outside the housing, is protected by a perforated sensor tube. The sensors are designed for non-pressurized systems. The unit should be installed in a location where condensed water vapor cannot enter the housing. The preferred position is "sensor vertically down" or "sensor horizontally." In such positions, a cover with a 0.8mm diameter hole will prevent water from entering.
TFG80 sensors have built-in temperature sensors (mostly Pt100) for simultaneous temperature measurements. Temperature readings are also converted to standardized signals 0…20mA or 4…20mA or 0…10V.

Sensor Response
According to the law of diffusion, there is a time delay before the fibers become saturated during water absorption. This is a decisive factor in determining the response time. Therefore, for a single 3μm diameter fiber, a short saturation time (a few seconds) can be changed. Empirical studies show that the use of bonded or woven fibers, as in the case of Galltec sensors, results in a longer saturation time. This is because individual fibers interact with each other as they absorb and expel water, and the associated moisture content is only detected later. Measurements have shown that at a wind speed of 2 m/s, the half-life is approximately 1.2 minutes. This translates to an actual response time of approximately 30-40 minutes.


Half-Time

POLYGA Humidity and Temperature Sensor - FG80, TFG80 - Half-Time

Thermal Behavior

POLYGA Humidity and Temperature Sensor - FG80, TFG80 - Thermal Behavior

A temperature of 80°C is given as the maximum value. Higher temperatures can occur for short periods. A possible result could be a change in the molecular structure, which causes a permanent error. The maximum temperature of 80°C only applies when no harmful substances (acids, solvents, etc.) are present in the medium.

Technical Data:
Physical Data

Humidity

Measuring Range
0…100%rh
Measurement accuracy
…>40%rh
±2.5%rh
…<40%rh
according to tolerance chart
Working scope
30…100%rh


Temperature

Working scope
-30…+80oC
Measurement accuracy
±0.5oC
Measured medium
air, unpressurized, non-aggressive
Permissible temperature at the housing
-20…+60°C
At the sensor
-40…+80oC
Average temperature coefficient
0.1%/K for 20oC and 50%rh
Regulation
for mean air pressure 430m NN
Permissible air speed
8m/s
Z cover
15m/s
Half-life for v=2m/s
1.2min
Sensor length; material
220mm; High-quality steel
Mounting
Holes in the housing base for duct mounting
(Prod. No. 20.009)
Mounting bracket on the wall
Mounting position
sensor vertically down; or horizontally
Terminal connections
for cables with cross-sections of 0.5mm22
Wire entries
Connector screw M20x1.5
Electromagnetic compatibility
Noise immunity
EN 50 082-2
Noise emissions
EN 50 081-2
Housing
ABS
Protection
IP64
Weight
ok. 0.4 kg


Electrical data for passive sensors

Humidity
Output 1
0-100 Ω linear 2-wire
0-200 Ω linear 2-wire
0-1000 Ω linear 2-wire
100-138.5 Ω linear 2-wire
5-100-5 Ω linear 3-wire
Permissible Load
1W
Maximum voltage
42V
Insulation resistance
10 MΩ


Temperature
Output 2 (TFG80H)
Pt100 ref. DIN EN60751
acceptable load
for air 1m/s i t=0.1K
2mA


Electrical data for active sensors

Humidity
Output 1
0-20mA or 0-10V 4-wire
or 4-20mA 2-wire (DC only)


Temperature
Output 2
0-20mA or 0-10V 4-wire
or 4-20mA 2-wire (DC only)
Supply voltage
15-30V DC or 24V AC ± 10%
Max. load for current output
500Ω
Min. Voltage output impedance
10kΩ
Internal power consumption
5mA, DC version
10mA, AC version
Temperature measurement range
see table
Linearity distortion
temperature output
<0.5%


Model Humidity Temperature Supply Voltage Conduction System Product Number
Measuring Range 1 Output 1 Measuring Range 2 Output 2
Passive Sensors Overview

FG80H

 0-100 %rh 0-100 Ω Max 42V 2-pin

44010100
0-100 %rh 0-200 Ω Max 42V 2-pin

44010200
0-100 %rh 0-1000 Ω Max 42V 2-pin

44010300
0-100 %rh 100-138.5 Ω Max 42V 2-pin

44010400
0-100 %rh 5-100-5 Ω Max 42V 3-pin

44010600

TFG80H

 0-100 %rh 0-100 Ω +5…+80oC Pt100 Max 42V 2-pin

44700150
0-100 %rh 0-200 Ω +5…+80oC Pt100 Max 42V 2-pin

44700250
0-100 %rh 0-1000 Ω +5…+80oC Pt100 Max 42V 2-pin

44700350
0-100 %rh 100-138.5 Ω +5…+80oC Pt100 Max 42V 2-pin

44700450
0-100 %rh 5-100-5 Ω +5…+80oC Pt100 Max 42V 3-pin

44700650
Overview of active sensors U=15…30V DC and/or 24V AC (20…28V AC)

FG80J
FG80AC

 0-100 %rh 0-20 mA 15 – 30V DC 3/4 - wires

44013000
0-100 %rh 0-20 mA 24V AC 3/4 - wires

44014200
0-100 %rh 0-10V DC 15 – 30V DC
24V AC		 3/4 - wires

44014700
0-100 %rh 4-20 mA 15 – 30V DC 2 - wires

44014800

TFG80J
TFG80AC

 0-100 %rh 0-20 mA 0…+40oC 0-20mA 15 – 30V DC 3/4 - wires

44513030
0-100 %rh 0-20 mA -30…+60oC 0-20mA 15 – 30V DC 3/4 - wires

44573030
0-100 %rh 0-20 mA -10…+90oC** 0-20mA 15 – 30V DC 3/4 - wires

44623030
0-100 %rh 0-20 mA 0…+100oC* 0-20mA 15 – 30V DC 3/4 - wires

44543030
0-100 %rh 0-20 mA 0…+40oC 0-20mA 24V AC 4 - wires

44514242
0-100 %rh 0-20 mA -30…+60oC 0-20mA 24V AC 4 – wires

44574242
0-100 %rh 0-20 mA -10…+90oC 0-20mA 24V AC 4 - wires

44624242
0-100 %rh 0-20 mA 0…+100oC* 0-20mA 24V AC 4 - wires

44544242
0-100 %rh 0-10V DC 0…+40oC 0-10V DC 15 – 30V DC
24V AC		 3/4 - wires

44514747
0-100 %rh 0-10V DC -30…+60oC 0-10V DC 15 – 30V DC
24V AC		 3/4 - wires

44574747
0-100 %rh 0-10V DC -10…+90oC 0-10V DC 15 – 30V DC
24V AC		 3/4 - wires

44624747
0-100 %rh 0-10V DC 0…+100oC* 0-10V DC 15 – 30V DC
24V AC		 3/4 - wires

44544747
0-100 %rh 0-20 mA 0…+40oC 0-20mA 15 – 30V DC 2 - wires

44514848
0-100 %rh 0-20 mA -30…+60oC 0-20mA 15 – 30V DC 2 - wires

44574848
0-100 %rh 0-20 mA -10…+90oC 0-20mA 15 – 30V DC 2 - wires

44624848
0-100 %rh 0-20 mA 0…+100oC* 0-20mA 15 – 30V DC 2 - wires

44544848

Special
FG80JPt100

 0-100 %rh 0-20 mA Pt100 resistance 15 – 30V DC 3/4 – wires

44703050
0-100 %rh 0-10V DC Pt100 resistance 15 – 30V DC
24V AC		 3/4 - wires

44704750
0-100 %rh 4-20 mA Pt100 resistance 15 – 30V DC 2 - wires

44704850
* attention to max. Temperature range ** suitable for the EDJ controller

Tolerance and humidity diagram

Tolerance and humidity diagram

Connection diagram for passive sensors with resistive output

Less
Read more
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