Ref: ds_KFF_1008 Ver2.0
Relative Humidity and Temperature Sensor KFTF/AFTF
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Description
Features
The KFF range of humidity sensors is used in refrigeration and
air conditioning in air ducts or greenhouses and halls. They
convert the humidity and temperature measurements into
analogue signals of 0...10Vdc or 4...20mA. A capacitive RH
sensor and NTC thermistor provide accurate measurements and
long term stability.
●● Humidity only or Humidity & Temperature Outputs
●● Optional Direct Thermistor for temperature measurement
●● Choice of outputs
Technical Specification
Commissioning
Power Supply: 24Vac/dc for 0..10Vdc output
15...36Vdc for 4...20mA output max load 500Ω
Sensors:
Capacitive Humidity sensor, NTC temperature
To perform an accurate comparison between a transmitter
output and a portable reference, it is essential that the two
probes are held adjacent for a minimum of 30 minutes in a
stable RH environment. It is not uncommon for test instruments
and transmitters to disagree by 10% RH or more when
sites measurements are taken incorrectly. “Slings” or other
mechanical hygrometer should not be used as reference.
Measuring Range: Humidity - 0...100% RH
Temp - KFTF 0...50°C AFTF –20°C…+80°C
Operating Range: Humidity - 10...90% RH
Temp - KFTF 0...50°C AFTF –20°C…+80°C
Accuracy:
Humidity - ±3% RH 40...60% RH otherwise ±5%
Temperature - ±0.8K at 20°C
Outputs:
0...10Vdc or 4...20mA
Connection:
0.5-1.5 mm cable.
Enclosure:
Glass reinforced polyamide 72 x 64 x 39.4 mm
“Manufactured and supplied to E. C. Products
Limited by S+S Regeltechnik GmBH”
Wiring
KFF-U
Order Codes
KFF-U
Duct RH Sensor 3% 4...20mA
KFF-I
Duct RH Sensor 3% 0...10Vdc
KFTF-U
Duct RH & Temperature Sensor 4...20mA
KFTF-I
Duct RH & Temperature Sensor 0...10Vdc
AFTF-U
Wall RH & Temperature Sensor 4...20mA
AFTF-I
Wall RH & Temperature Sensor 0...10Vdc
KFF-I
KFTF-U/AFTF-U
Installation
1. Select a location in the air duct or on the wall where
contaminants are a minimum.
2. Mark hole on the duct for cutout and insert the probe into the
air ducts by using the bracket provided or mark holes on the
wall and secure. Take care do not contaminate the transmitter
with dust, dirt and static.
3. Connect wiring to the terminal block. Make connections to the
transmitter only after all other electrical installation and test
work has been completed.
KFTF-I/AFTF-I
4. Ensure the supply voltage is within specification.
5. It is recommended that screened cable be used and that the
screen should be earthed at the controller. Control cable
should not be run next to power and other cables which may
produce significant magnetic noises.
6. Allow 3-5 minutes before functional check.
7. Allow 30 minutes before carrying out pre-commissioning
checks.
E.C. Products Limited - Head Office
EC House, Amberley Way, Hounslow
Middlesex, TW4 6BH, United Kingdom
Tel: +44 (0)20 8569 4100 Fax: +44 (0)20 8569 4111
ECP reserves the right to change the information contained in this datasheet as and when required without notice. Users must take care to use the information contained in this leaflet. ECP will not
accept the liability for damages, loss and expenses that may be caused by omissions and errors in the information provided.