Product Catalogue

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09
HUMIDITY
The Right Humidity Sensor for Any Measuring Task
For humidity measurements various methods are used that differ from each other mainly with regard to their accuracy and their
suitability for long term measurements and the substance used for the measurement:
Capacitive Air Humidity Measurement,
Psychrometric Air Humidity Measurement,
Hygrometric Air Humidity Measurement,
Dielectric Measurement of Moisture in Materials,
Measurement of the Moisture in Materials According to the Principle of Conductivity,
Dew Point Determination with CCC Dew Point Probes,
Dew Point Determination with Dew Point Mirrors.
Capacitive Air Humidity Measurement
Capacitive sensors contain a glass substrate with a moisture sensitive polymer layer between two metal layers. By absorption of water,
corresponding to the relative humidity, the dielectric constant and, as a result, the capacity of the thin-film capacitor are changing. The
measuring signal is directly proportional to the relative humidity and does not depend on the atmospheric pressure.
Advantage:
maintenance-free measurement over longer periods,
can withstand temperatures below 0°C
atm. pressure-independent, works when pressure is applied
flexible use of the sensor
Disadvantage:
limited long term stability
sensitive to dewing
and certain aggressive substances
Psychrometric Air Humidity Measurement
Psychrometers are precision devices containing a dry and a moistened temperature sensor. As a result of the evaporation the humidity
sensor cools down, with a wind velocity of a minimum of 2m/s being required for the cool down process. The humidity values are
calculated from the temperature difference (psychrometric difference). The calculation formulae for ALMEMO ® devices correspond to
those used by the German Weather Authority related to 1013mbar. Differences regarding to the atmospheric pressure can be corrected
to achieve precise measurements.
Advantage:
Disadvantage:
no ageing of the sensor -
exception: contamination of the wick
high accuracy
high quality regarding the measuring technology
usable without problems up to 100% r.H. in all substances
long term measurement limited by the required water
reserve and wick maintenance
difficult to use with temperatures below 0°C and with low
humidities
depending on the atmospheric pressure
09.02
01/2007 We reserve the right to make technical changes.
Hygrometric Air Humidity Measurement
Hygrometric sensors are equipped with a measuring strip, which lengthens or tightens depending on the humidity. The measuring strip
consists of many single fibers (measuring harp), which are made from organic or synthetic material.
Advantage:
simple and low cost measuring technology,
also usable for contaminated environments
easy to clean
Dielectric Measurement of Moisture in Materials
Disadvantage:
limited accuracy
limited measuring range
slow measurement
The measurement of the moisture in materials is performed indirectly via the determination of the dielectric constant. This is
performed by using a capacity measurement via a high-frequency electrical field, which penetrates the material without disturbances.
Advantage:
simple and fast measuring technology
non-destructive contact measurement
long term use is possible
Disadvantage:
limited accuracy

HUMIDITY
09
Measurement of the Moisture in Materials according to the Principle of Conductivity
The measurement of the moisture in materials is performed indirectly via the determination of the electrical resistance, which depends
on the moisture content of the material.
Advantage:
Disadvantage:
simple and fast measuring technology
limited accuracy
probe insertions
only for short term control measurements
measured values depend on various material parameters
Dew Point Determination with CCC Dew Point Probes
The dew point sensor is equipped with an integrated sensor chip (CCC dew point principle according to Heinze), which is mounted on
a cooling element. The sensor unit is also connected to a control circuit that regulates the operating current of the cooling element so
that a defined condensate is established. The resulting dew point temperature will be directly measured within the sensor and can be
output in a format, which allows for an evaluation.
Advantage:
high accuracy, reliability and reproducibility
wide measuring range
Disadvantage:
high-sophisticated measuring method
not suitable for quick control measurements
cannot be used at temperatures below 0°C
01/2007 We reserve the right to make technical changes.
Dew Point Determination with Dew Point Mirrors
An optically monitored mirror is mounted on a cascaded Peltier element. The sensor unit is also connected to a control circuit that
regulates the operating current of the cooling element so that a defined condensate is established. The dew point temperature will be
directly measured within the sensor and can be output in a format, which allows for an evaluation.
Advantage:
high accuracy, reliability and reproducibility
independent from atmospheric pressure
wide measuring range
suitable for temperatures below 0°C
Disadvantage:
high sophisticated measuring method
high current consumption
risk of contamination
Small Glossary for Humidity/Moisture Measurement Variables
Absolute Humidity
Enthalpy
Mixture Ratio
Relative Humidity
Saturation Vap. Pressure
Dew Point
Water Vap. Partial Press.
The absolute humidity indicates the weight of the water vapour contained in one m 3 of a mixture of air
and water vapour.
The enthalpy indicates how much heat is stored within the humid air. This value is important for
calculating the cooling and heating performance, e.g. when checking heat exchangers.
The absolute humidity related to 1kg dry air.
The relative humidity indicates the percentage of air, which is saturated with water vapour, i.e. how much
percent of the maximum possible amount of water vapour is currently contained in the air. Owing to the
dependence on temperature the relat. humidity can only ever be indicated for one specific temperature.
Air can only ever contain a certain maximum amount of water vapour. This is called the saturation vapour
pressure, specified as g water vapour per kg of humid air. The saturation vapour pressure strongly
depends on the air temperature. At low temperatures it will be low and at high temperatures it will be
high. Therefore, warm air can accept large amounts of vapour pressure and cold air only small amounts.
The dew point is the temperature where the relative humidity equals 100%. If the dew point is not
reached the water vapour will start condensing.
The total pressure in the room determined by the water vapour.
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Measuring Air Humidity and Moisture in Materials à la ALMEMO ®
When using ALMEMO ® sensors, important functions for measured values are automatically activated in ALMEMO ® devices when
humidity measurements are performed. Please ask for our detailed ALMEMO ® Manual. It will provide you with valuable tips and a
detailed description regarding the measurement of humidity and moisture à la ALMEMO ® .
09.03

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09
HUMIDITY
09.04
01/2007 We reserve the right to make technical changes.
Capacitive humidity sensor Typ FHA646-E1 / -E1C / -E2C / -E3C
Technical data :
Handy sensor for test measurements and stationary
applications up to +60 °C.
Sensor tube made of plastic.
Intelligent ALMEMO ® extension cables, up to 100 meters long.
Sturdy sensor for test measurements and stationary
applications up to +80 °C.
Sensor tube made of stainless steel.
Splash-protected cable gland.
Active compensation of humidity measurement by means of
the integrated temperature sensor (new measuring range
for all ALMEMO ® devices with effect from 2003).
Wide range of operating temperatures.
Intelligent ALMEMO ® extension cables, up to 100 meters.
Accessories :
Protective caps see page 09.06
Brackets for wall mounting, distance from wall approx. 40 mm
Movable aluminum screw connection with Teflon sealing ring
Connecting flange for screw connection, hole circle 38 mm Ø
Extension cable, 2 meters long
Extension cable, 4 meters long
Intelligent extension cable, 5 meters long
Intelligent extension cable, 10 meters long
Intelligent extension cable, 20 meters long
Intelligent extension cable, 30 meters long
Intelligent extension cable, 50 meters long
Intelligent extension cable, 100 meters long
Operative range:
FHA646-E1
–20 to +60 °C/ 5...98 % r.H.
FHA646-E1C / -E2C / -E3C –20 to +80 °C/ 5...98 % r.H.
Humidity measuring circuit
Measuring range : 0 to 100 % r.H.
Sensor :
capacitive
Accuracy :
± 2 % r.H. at nominal temperature
Reproducibility :

HUMIDITY
09
Capacitive humidity sensor Type FHA646KxC
Built-in sensor with sturdy ALMEMO ® circular connector.
Sensor tube made of stainless steel.
Active compensation of humidity measurement by means of
the integrated temperature sensor (new measuring range for
all ALMEMO ® devices with effect from 2003).
Wide range of operating temperatures.
Intelligent ALMEMO ® connecting cables, up to 100 meters.
Technical data :
Operative range :
Humidity measuring circuit :
Measuring range :
Sensor :
Accuracy :
Reproducibility :
–20 to +80 °C/ 5 to 98 % r.H.
0 to 100 % r.H.
capacitive
Nominal temperature : +25 ± 3 °C
Sensor operating pressure :
Response time T 90 :
Temperature measuring circuit
Sensor:
Accuracy :
Reproducibility :
Mechanical design
Sensor tube :
Protective cap :
Connection :
± 2 % r.H. at nominal temperature

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09
HUMIDITY
Protective caps for capacitive humidity sensors Type FHA646-E1x/-KxC/-E7C/-5x
SK7 SK6 SK8
Dimensions : length approx. 33 mm, diameter 12 mm
Types :
Designation Pore- Maximum Typical Application Type
size temperature
SK7 Metal-mesh filter in 100 µm 120°C Universal, for medium, Order No. ZB9600SK7
PC-housing
contamination, also high humidity
SK6 PTFE-Sinterfilter 50 µm 180°C High chemical resistance Order No. ZB9600SK6
SK8 Stainless steel 10 µm 180°C For severe mechanical stress, Order No. ZB9600SK8
sinter filter
heavy contamination,
strong air flow
Brackets for wall mounting
Brackets for wall mounting, distance from wall approx. 40 mm
Order No. : ZB9600W
09.06
01/2007 We reserve the right to make technical changes.
Movable screw connection
Movable aluminum screw connection with Teflon sealing ring
Connecting flange for screw connection, hole circle 38 mm Ø
Order No. : ZB9600KV
Order No. : ZB9600F

HUMIDITY
09
Capacitive Humidity Sensor Type FHA6466
Compact sensor integrated into ALMEMO ® connector.
Suitable for control and long term measurements in
climatology.
Technical Data:
Operative range : –20 to +60 °C / 5 to 98 % r.H.
Humidity Measuring Circuit
Measuring range: 0 to 100 % r.H.
Sensor:
capacitive
Accuracy:
±2% r.H. at nominal temperature
Reproducibility:
< 1% r.H. at nominal temperature
Nominal temperature: 25°C ±3°C
Sensor operating pressure: atmospheric pressure
Response time T 90 : approx. 10s (without filter) at 5m/s
Temperature Measuring Circuit
Sensor:
NTC type N
Accuracy:
–20 … 0°C: ±0.4°C
0 … 60°C: ±0.1°C
Reproducibility:
0.1°C
Slotted case
plastic, 30 x 11 x 7.6 (without filter)
01/2007 We reserve the right to make technical changes.
Types (including manufacturer’s test certificate)
Length 85mm
Order No. FHA6466
Pressure Sealed Humidity Sensor Type FHA6467
Compact screwed sensor.
For pressure lines up to 16bar.
Sensor usable in the range –20 … 80°C/5 … 98% r.H.
Accessories:
Adapter for measuring compressed air Order No. ZB96467AP
Protective caps, see 09.06
Extension cable, 2m long
Order No. ZA9060VK2
Extension cable, 4m long
Order No. ZA9060VK4
Intelligent extension cable,
10 meters long Order no. ZA9060VKC10
Types
(including manufacturer’s test certificate and pressure test protocol)
Length 140mm
Order No. FHA646E7C
Technical Data:
Operative range : –20 to +80 °C / 5 to 98 % r.H.
Humidity Measuring Circuit
Measuring range: 0 to 100 % r.H.
Sensor:
capacitive
Accuracy:
±2% r.H. at nominal temperature
Reproducibility:
< 1% r.H. at nominal temperature
Nominal temperature: 25°C ±3°C
Sensor operating pressure: to 16 bar
Response time T 90 : approx. 8s (without filter)
Temperature Measuring Circuit
Sensor:
NTC type N
Accuracy:
–20 … 0°C: ±0.4°C
0 … 70°C: ±0.1°C
70 … 80°C: ±0.6°C
Reproducibility:
0.1°C
Mechanical Construction
Sensor tube:
total length 140mm, 12mm Ø
Installation:
screw thread G1/2”,
insertion depth 47mm
Protective cap:
SK6, PTFE-Sinterfilter
Cable:
1.5m long, ALMEMO ® connector,
longer ALMEMO ® cable (up to 30m),
available on request
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09.07

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09
HUMIDITY
Capacitive Humidity Sensor Type FHA646R
Technical Data:
Compact sensor with extremely small dimensions.
Particularly suitable for measurements between PCBs, within
housings, in walls, ceilings, and insulations used in structural
engineering and protection of historic monuments.
Sensor usable in the range –30 … 100°C/5 … 98% r.H.
Accessories:
Extension cable, 2m long
Extension cable, 4m long
Types:
Length 50mm
Order No. ZA9060VK2
Order No. ZA9060VK4
Order No. FHA646R
Operative range : –30 to +100 °C / 5 to 98 % r.H.
Humidity Measuring Circuit
Measuring range: 0 to 100 % r.H.
Sensor:
capacitive
Accuracy:
±2% r.H. at nominal temperature
Reproducibility:
< 1% r.H. at nominal temperature
Nominal temperature: 25°C ±3°C
Response time T 63 : approx. 10s at 1m/s
Temperature Measuring Circuit
Sensor:
NTC type N
Accuracy:
–20 … 0°C: ±0.4°C
0 … 70°C: ±0.1°C
70 … 100°C: ±0.6°C
Reproducibility:
0.1°C
Mechanical Construction
Sensor tube:
nickel plated, 50mm long, 5mm Ø
Protective cap:
none
Cable:
2m long, ALMEMO ® connector
High-temperature moisture transmitter
Type MT8636HR6
Technical data :
Operative range :
Sensor, including sensor cable : -40 to +180 °C
Electronics housing : -40 to +60 °C
Humidity measuring circuit
Measuring range :
0 to 100 % r.H.
Sensor :
capacitive
Accuracy :
± 2 % r.H. in range 0 to 90 % r.H.
± 3 % r.H. in range 0 to 100 % r.H.
each at nominal temperature
09.08
01/2007 We reserve the right to make technical changes.
High-temperature cable sensor with transmitter, suitable for
fixed installation.
Analog output range, scalable to -40 to +180 °C / 0 to 100 % r.H.
Analog output type, 0 to 10 V standard (0 to 5 V or 0/4 to 20
mA also available from the factory).
Pressure-sealed, up to 15 bar, available on request.
Options:
High-temp. sensor cable, 5 meters Order no. : OT8636HR6L05
High-temp. sensor cable, 10 meters Order no. : OT8636HR6L10
High-temp. sensor cable, 20 meters Order no. : OT8636HR6L20
Types (including manufacturer’s test certificate)
High-temperature moisture transmitter
with sensor cable, 2 meters long Order no. : MT8636HR6
ALMEMO ® connector cable, 2 meters long, PVC
including ALMEMO ® connector and mains adapter
ZB1012NA1, 12 V / 200 mA Order no. : ZA8636HR6AK
Nominal temperature : +23 °C ± 3 K
Response time :

HUMIDITY
09
Capacitive Humidity Sensor Type FHA636HRx
Handy sensor with handle.
Suitable for control measurements at high ambient
temperatures.
☞
Not suitable for stationary installation
(sensor handle max. 60 °C).
Accessories:
Extension cable, 2m long
Extension cable, 4m long
Order No. ZA9060VK2
Order No. ZA9060VK4
Types (including manufacturer’s test certificate)
Length L = 250mm,
Operative range –50 … 150°C Order No. FHA636HR1
Length L = 400mm
Operative range –50 … 200°C Order No. FHA636HR2
Technical Data:
Operative range :
Sensor tip : –50 to +150 °C (200 °C)
Sensor handle : -20 to +60 °C
Humidity Measuring Circuit
Measuring range: 0 … 100% r.H.
Sensor:
capacitive
Accuracy:
±1.5% r.H. at nomin. temperature
±2.5% r.H.< 10% and > 90%
Reproducibility:
0.5% r.H.
Nominal temperature: 23°C ±2°C
Response time T 63 : 15s without filter
at 1m/s air speed
Temperature Measuring Circuit
Sensor:
Pt100, 1/3 Class B
Accuracy:
±0.3K at nominal temperature
Reproducibility: 0.1K
Mechanical construction
Sensor tube:
heat resistant plastic
Ø 15mm
Protective cap:
wire screen
Sensor handle:
180mm long,
Cable:
1.5m long, ALMEMO ® connector
01/2007 We reserve the right to make technical changes.
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09.09

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09
HUMIDITY
Conduit-Mt. Sensor Type MT8xx6KxRx/FHA6465x
Capacitive humidity sensor with or without temperature
sensor, particularly suitable for conduit mounting.
Suitable for stationary measurements in climatology.
Designed for power supply with 15 … 24VDC.
Accessories:
Movable aluminium screw connection
With Teflon sealing ring
Order No. ZB9600KV
Connecting flange for screw connection,
Hole circle 38mm Ø
Order No. ZB9600F
Protective caps see page 09.06
Technical Data:
Operative range :
Sensor :
–30 to +70 °C, 5 to 98 % r.H.
Head :
0 to +60 °C, 0 to 90 % r.H.
(non-condensing)
Humidity Measuring Circuit
Measuring range: 0 … 100 % r.H.
Sensor:
capacitive
Accuracy:
± 2% r.H. at nominal temperature
Reproducibility:
< 1% r.H. at nominal temperature
Nominal temperature: 25°C ±3°C
Response time T 90 : approx. 10s (without filter) 5m/s
Electronics, accuracy ±0.2% of measured value
±0.5% RH, TC 0.04% RH / K
Temperature Measuring Circuit
Sensor:
PT100 or NTC type N
Accuracy: Pt100: IEC 751, Class B
NTC: –20 … 0°C: ±0.4°C
0 … 70°C: ±0.1°C
Electronics, accuracy ±0.2% of measured value
±0.2 K, TC 0.01°C / K
Mechanical Construction
Sensor tube:
aluminium, 12mm Ø
Protective cap:
SK7, metal-mesh filter
Connecting head: made of black PVC
09.10
01/2007 We reserve the right to make technical changes.
Types (including manufacturer’s test certificate)
Transmitters for conduit mounting, connection via screw terminals
Temperature Sensor
without
Signal Output (corresponds to 0…100 % r.H./–30…+70°C)
0 … 10V
Length
L = 122mm Order No. MT8616K1R2
without 0 … 10V L = 262mm Order No. MT8616K2R2
without 0 … 10V L = 522mm Order No. MT8616K3R2
without 0 … 1V L = 122mm Order No. MT8616K1R5
without 0 … 1V L = 262mm Order No. MT8616K2R5
without 0 … 1V L = 522mm Order No. MT8616K3R5
without 0 … 20mA L = 122mm Order No. MT8716K1R3
without 0 … 20mA L = 262mm Order No. MT8716K2R3
without 0 … 20mA L = 522mm Order No. MT8716K3R3
without 4 … 20mA L = 122mm Order No. MT8716K1R4
without 4 … 20mA L = 262mm Order No. MT8716K2R4
without 4 … 20mA L = 522mm Order No. MT8716K3R4
Pt100 2 x 0 … 10V L = 122mm Order No.MT8636K1R2
Pt100 2 x 0 … 10V L = 262mm Order No.MT8636K2R2
Pt100 2 x 0 … 10V L = 522mm Order No.MT8636K3R2
Pt100 2 x 0 … 1V L = 122mm Order No.MT8636K1R5
Pt100 2 x 0 … 1V L = 262mm Order No.MT8636K2R5
Pt100 2 x 0 … 1V L = 522mm Order No.MT8636K3R5
Pt100 2 x 0 … 20mA L = 122mm Order No. MT8736K1R3
Pt100 2 x 0 … 20mA L = 262mm Order No. MT8736K2R3
Pt100 2 x 0 … 20mA L = 522mm Order No. MT8736K3R3
Pt100 2 x 4 … 20mA L = 122mm Order No. MT8736K1R4
Pt100 2 x 4 … 20mA L = 262mm Order No. MT8736K2R4
Pt100 2 x 4 … 20mA L = 522mm Order No. MT8736K3R4
Humidity / temperature sensors for conduit mounting including ALMEMO ® connecting cable, 2 m
Supply voltage via ALMEMO ® device
Temperature Sensor Signal Output Length
NTC for ALMEMO ® devices L = 122mm Order No. FHA64651
NTC
NTC
for ALMEMO ® devices
for ALMEMO ® devices
L = 262mm
L = 522mm
Order No. FHA64652
Order No. FHA64653
For longer ALMEMO ® cable (up to 30m), please specify length.
Order No. ZB9060K

HUMIDITY
09
Wall-housing transmitter MA8646
Transmitter MA8646-0 with mountable sensor FHA646-6C
Twin analog transmitters for capacitive ALMEMO ® humidity
sensors.
Humidity sensors can be connected, exchanged as and when
necessary.
Analog output range can be scaled on the sensor connector.
For stationary measuring operations, housing suitable for
wall-mounting.
Versions available for different supply voltages.
Options :
Analog output, 2 x 0 to 20 mA
Analog output, 2 x 4 to 20 mA
Other analog output range,
PLEASE SPECIFY WHEN ORDERING !
Programming on the
humidity sensor connector
Voltage supply : 13 to 28 V DC
not electrically isolated
Voltage supply : 10 to 30 V DC
electrically isolated
Voltage supply : 110 V AC, 50-60 Hz
Order no. : OA8646R3
Order no. : OA8646R4
Order no. : OA9000PR
Order no. : OA8646U0
Order no. : OA8646U
Order no. : OA8646U5
Humidity sensors (including manufacturer’s test certificate)
Mountable sensor, –20 to +60 °C
Plastic tube,
with 1.5-meter cable, –20 to +60 °C
Stainless steel tube,
with 1.5-meter cable, –20 to +80 °C
Miniature sensor,
with 2-meter cable, -30 to +100 °C
up to 16 bar,
with 1.5-meter cable, –20 to +60 °C
Order no. : FHA6466C
Order no. : FHA646E1
Order no. : FHA646E1C
Order no. : FHA646R
Order no. : FHA646E7C
Technical data :
Operative range : see humidity sensor
Humidity measuring circuit
Measuring range : 0 to 100 % r.H. (%rH, HrH, HcrH)
Sensor :
capacitive
Accuracy :
± 2 % r.H. at nominal temperature
Reproducibility : 1 % at nominal temperature
Nominal temperature : +23 ± 3°C
Transmitter, accuracy : ± 0.5 % r.H.
Temperature measuring circuit :
Measuring range : -50 to +125 °C
Sensor :
NTC type N
Accuracy :
0 to +70 °C : ± 0.1 K
-20 to 0 °C : ± 0.4 K
+70 to +100 °C : ± 0.6 K
Reproducibility : 0.1 K
Transmitter, accuracy : ± 0.1 K
Outputs :
2 x 0 to 10 V (load : >100 kohm)
Resolution :
12 bit (4000 digits)
Temperature drift : ± 0.02 % / K
Nominal temperature : +23 ± 3°C
Option R3 :
2 x 0/4 to 20 mA
(burden :

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09
HUMIDITY
Humidity / temperature transmitter in
all-weather protective housing Type MT8xx6AGx
Capacitive humidity sensor with / without Pt100 temperature
sensor.
Stable all-weather protective housing.
Designed for supply voltage 15 to 24 V DC.
Technical Data:
Operative range :
–30 to +60 °C, 0 to 90 % r.H.
(non-condensing)
Humidity measuring circuit
Sensor:
capacitive thin-film sensor
Measuring range: 0 to 100 % r.H.
Accuracy:
±2% r.H. at nominal temperature
Reproducibility:
±1% r.H. at nominal temperature
Nominal temperature: 25°C ±3°C
Electronics, accuracy ±0.2% of measured value
±0.5% RH, TC 0.04% RH / K
Temperature measuring circuit
Sensor:
Pt100
Accuracy: Pt100: IEC 751, class B
Electronics, accuracy ±0.2% of measured value
±0.2 K, TC 0.01°C / K
Dimensions
All-weather protection
Ø 85 mm, H approx. 100 mm
Electronics box
80 x 80 x 25 mm
09.12
01/2007 We reserve the right to make technical changes.
Types (including manufacturer’s test certificate)
Temperature sensor Signal output (corresponds to 0 to 100 % r.H. / -30 to +70 °C)
Without temperature sensor Output 0 to 10 V Load ≥1 kΩ max. 10 mA Order No. MT8616AG2
Without temperature sensor Output 0 to 1 V Load ≥1 kΩ max. 10 mA Order No. MT8616AG5
Without temperature sensor Output 0 to 20 mA Load RL max. 500 Ω Order No. MT8716AG3
Without temperature sensor Output 4 to 20 mA Load RL max. 500 Ω Order No. MT8716AG4
Pt100 temperature sensor Output 2 x 0 to 10 V Load ≥1 kΩ max. 10 mA Order No. MT8636AG2
Pt100 temperature sensor Output 2 x 0 to 1 V Load ≥1 kΩ max. 10 mA Order No. MT8636AG5
Pt100 temperature sensor Output 2 x 0 to 20 mA load RL max. 500 Ω Order No. MT8736AG3
Pt100 temperature sensor Output 2 x 4 to 20 mA Load RL max. 500 Ω Order No. MT8736AG4

HUMIDITY
09
Humidity / temperature sensor in all-weather
protective housing Typ FHA646AG
Supply voltage via ALMEMO ® device.
Sensor cable connected via screw terminals,
optional up to 30m.
Technical Data:
Operative range :
Humidity measuring circuit
Sensor:
Measuring range:
Accuracy:
Reproducibility:
Nominal temperature:
Temperature measuring circuit
–30 to +60 °C, 0 to 90 % r.H.
(non-condensing)
capacitive thin-film sensor
0 to 100 % r.H.
±2% r.H. at nominal temperature
±1% r.H. at nominal temperature
25°C ±3°C
Sensor:
NTC type N
Accuracy: NTC: –20 to 0°C: ±0.4°C
0 to 60°C: ±0.1°C
Reproducibility:
0.1°C
Dimensions
Electronics box
All-weather protection
Ø 85 mm, H approx. 100 mm
80 x 80 x 25 mm
01/2007 We reserve the right to make technical changes.
Accessories, Options:
Longer ALMEMO ® connecting cable, per meter (max. 30 m)
Order No. ZB9060K
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Typ (including manufacturer’s test certificate)
Humidity / temperature sensor in all-weather protective housing including ALMEMO ® connecting cable, 2 m
Order No. FHA646AG
09.13

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09
HUMIDITY
Hand-held psychrometer type FNA846
Technical Data:
Humidity
Operating range 0 to +60 °C / 10 to 100 % r.H.
Available values :
Dry temperature, relative humidity, dew point, mixture ratio,
humid temperature, partial vapour pressure.
For precision measuring operations the current
atmospheric pressure can be entered in ALMEMO ®
devices and the measured value will then be corrected
automatically.
Accessories:
Measuring module for barometric pressure
Order no. F DA612MA
Connecting cable
for pressure measuring module, 0.2m Order no. ZA9060AK1
Extension pipe, 200 mm long Order no. ZB9846VR
Plastic suction hose, 300 mm long Order no. ZB9846PS
Tripod
Order no. ZB9846AF
Spare wicks (2 pieces)
Order no. ZB9846ED
Measuring range:
Measuring type:
Accuracy:
Reproducibility:
Nominal conditions:
Temperature
Sensor:
Accuracy:
Electrical supply
Operating voltage:
Current consumption :
Mechanical construction
Housing:
Dimensions:
Weight:
Cable :
10 to 100% r.H.
psychrometric
±1% r.H. under nominal conditions
< 1% r.H.
25°C ±3°C , 1013 mbar, 50% r.H.
2 x NTC type N
0 to 60°C: ±0.1K
9 V DC via ALMEMO ® device
approx: 10 mA
plastic
Ø 50 mm, 245 mm long
approx. 300 g
1.5 m long
with ALMEMO ® connector
09.14
01/2007 We reserve the right to make technical changes.
Types:
Hand-held psychrometer, including water bottle, two wicks
As above with turn-off motor for WBGT measurement
Order No. FNA846
Order No. FNA846WB

HUMIDITY
09
Psychrometer type FNA8463 / FPA8363
Optimized version for long-term measuring operations.
Especially suitable for high temperatures.
Operating range 0 to 90 °C / 10 to 100 % r.H.
Available values :
Dry temperature, relative humidity, dew point, mixture ratio,
humid temperature, partial vapour pressure.
Technical Data:
Humidity
Measuring range :
Measuring type :
Accuracy :
Reproducibility :
Nominal conditions :
Temperature FNA8463
Sensor:
10 to 100 % r.H.
psychrometric
±1% r.H. under nominal conditions
< 1% r.H.
25 ± 3 °C , 1013 mbar, 50% r.H.
2 x NTC type N
Accuracy: 0 to 70°C, ± 0.1K
70 to 90°C, ± 0.4K
Temperature FPA8363
Sensor:
Accuracy:
2 x Pt100
IEC 751, IEC 751, class B
ALMEMO ® adjusted
01/2007 We reserve the right to make technical changes.
For precision measuring operations the current
atmospheric pressure can be entered in ALMEMO ®
devices and the measured value will then be corrected
automatically.
Electrical supply
Operating voltage :
Current consumption :
12 V DC via mains supply unit
(cable approx. 2 meters)
approx. 40 mA
Accessories:
Measuring module
for barometric pressure
Connecting cable, 0.2 m
for pressure measuring module
Spare wicks (2 pieces)
Extension cable for mains supply units
with 3-pin bayonet coupling,
length : 5 meters
Order no. FDA612MA
Order no. ZA9060AK1
Order no. ZB98462ED
Order no. : ZB5090VK05
Mechanical construction
Housing :
plastic polycarbonate
Dimensions : L 175 x W 50 x H 75
Weight :
Cable :
approx. 890 g
PVC (up to 90°C),
5 m with ALMEMO ® connector
FNA8463 : 1 cable / 1 connector
FPA8363 : 2 cables / 2 connectors
Types:
(including mains supply unit, water bottle, two wicks)
Psychrometer with 2 x NTC sensors including connecting cable (one ALMEMO ® connector)
Psychrometer with 2 x Pt100 sensors including connecting cable (two ALMEMO ® connectors)
Order No. FNA8463
Order No. FPA8363
www.ahlborn.com
09.15

www.ahlborn.com
09
HUMIDITY
ALMEMO ® dew-point sensor, type FHA646DTC1
Dew-point transmitter
with current output MT8716DTC1
Especially suitable for dew-point measurement with high
level precision and long-term stability.
Automatic calibration.
Digital transfer of measured values to the ALMEMO ® display
section (avoids risk of inaccuracy on the connecting lines or
in the display section itself).
High-level accuracy sustained down to -80 °C.
High-speed reaction time.
Displayed variables : temperature, rel. humidity, dew-point.
Process connection for high pressures (optionally up to 350 bar).
Technical data :
Measuring range -80 to +20°C
dew-point temperature (DT)
Measuring accuracy ± 0.5°C from -10 to +20 °C DT,
typical ± 2°C at -40 °C DT
Measuring channels (FHA646DTC1 only)
Temperature -20.0 to +70.0 °C
Relative humidity 0 to 98.0% RH
Dew point -80.0 to +20.0 °C
dew-point temperature (DT)
Operating temperature -20 to +70 °C
Process connection Screw thread G 1/2”,
stainless steel
Pressure range
-1 to +50 bar standard
Storage temperature +40 to +80 °C
FHA646DTC1
Output
ALMEMO ® digital
Power supply via ALMEMO ® connector,
approx. 5 mA
Connection Cable, 1.5 meters,
with ALMEMO ® connector
MT8716DTC1
Output 4 to 20 mA / -80 to +20 °C
dew-point temperature (DT),
2 wires
Power supply 10 to 30 V DC, load

HUMIDITY
09
Dew Point Detector Type FHA9461
Dew detector for determination of dew conditions.
Consisting of one temperature sensor and an integrated
sensor chip with CCC dew point sensor.
Particularly suitable in building physics for control
measurements and stationary installation.
Technical Data:
Principle of measurement:
Operative range:
Settling time:
Temperature sensor:
Signal output:
Current consumption:
Heat flow plate:
Storage temperature:
CCC sensor
0°C to +70°C
(no ice formation,
no saliferous atmosphere)
final value after 2 to 60 seconds
NTC type N (10k at 25°C),
accuracy: ±0.1°C
(within operative range)
scaled voltage approx. 0 to 1V
approx. 3mA
aluminium, 40 x 40mm
–10°C to +70°C
01/2007 We reserve the right to make technical changes.
The dew point detector does not provide a measuring signal
but a step function: dewed (100%) / no dew (0%).
Types:
Sensor and electronics
integrated in ALMEMO ® connector,
mounted on heat conducting
plate made of aluminium
Order No. FHA9461
www.ahlborn.com
09.17

www.ahlborn.com
09
HUMIDITY
Water Detection Probe Type FHA936WD
Technical Data:
Measuring method:
detection of water
Meas. values:
10% water
Housing:
plastic handle
40mm Ø, 130mm long
Water detection probe for instant detection of uncombined
water.
Particularly suitable for construction applications, especially in
locations that are difficult to check visually, e.g. at sealing
joints, under cement floors etc.
Indirect moisture measurement according to the principle of
conductivity.
Probe with two collets for easy electrode replacements.
Electrodes in three different designs for matching any
required application.
Electrodes:
Electrode types:
Weight:
Nominal temperature:
Operating temperature:
stainless steel
uninsulated with rounded tip:
200mm long, 3mm Ø
uninsulated with sharp-edged tip:
50mm long, 3mm Ø
spring steel strap:
200mm long, 6mm wide, 0.5mm high
260g
23°C ±2°C
0 to +60°C
Storage temperature:
–20 to +80°C
Signal output: ALMEMO ® (approx. 0 to 2V)
Power supply:
7.5 to 15V
Current consumption
max. 10mA
Types:
Water detection probe
Order No. FHA936WD
Moisture Sensor Type FHA696MF
Technical Data:
Measuring method:
capacitive
Resolution: 0.1%
Measuring range (moisture): 0 to 50% moisture
09.18
01/2007 We reserve the right to make technical changes.
Moisture sensor for determination of the moisture content in
mineral construction materials, wood and cardboard.
Indirect measurement of the moisture through the
determination of the dielectric constant.
Capacity measurement through a high frequency
electromagnetic field, which penetrates the material in a nondestructive
way.
Accessories:
Test block for min. construct. materials Order No. ZB9696PE05
Test block for wood, paper, cardboard Order No. ZB9696PE30
Types:
Moisture sensor
Order No. FHA696MF
Measuring range (material): mineral construction materials 0 to
20%, woods 0 to 50%, paper and
cardboard 0 to 20%
Housing:
plastic handle with integrated
electronics
40mm Ø, 130mm long
Terminal block:
aluminium/plastic
20 x 25 x 70mm
Measuring comb: stainless spring steel
0.5mm, 70 x 35mm
Weight:
260g
Nominal temperature: 15 to 25°C
Operative range: 0 to +60°C
Storage temperature: –20 to +80°C
Signal output:
0 to 2V
Power supply: +8 to +12V
Current consumption approx. 7mA

HUMIDITY
09
Moisture Sensor Type FHA636MF
Moisture sensor for determination of the moisture content in
wood.
Indirect moisture measurement according to the principle of
conductivity.
Determination of the moisture content in the material
through the dependence of the electrical resistance on the
moisture.
Accessories:
Teflon-insulated measuring tip - helps avoid measuring errors in
the event of surface moisture, 1 piece
(2 pieces are needed per probe.) Order No. ZB9636MFST
Technical Data:
Measuring method:
principle of conductivity
Measuring range: 7 to 30 % moisture in wood
Housing:
plastic handle
40mm Ø, 130mm long
Measuring tips:
stainless steel, uninsulated
3mm Ø, 50mm long
Weight:
260g
Reproducibility: ± 1%
Nominal temperature: 23°C ±2°C
Operating temperature: 0 to +60°C
Storage temperature: –20 to +80°C
Signal output:
0 to 2V
Power supply: 7.5 to +12V
Current consumption max. 10mA
01/2007 We reserve the right to make technical changes.
Types:
Wood moisture probe
Order No. FHA636MF
www.ahlborn.com
09.19