User manual

OPERATION MANUAL
Technical changes reserved
0141 0316-224 02.12.2014
Humidity-Temperature probe with
standard Signal FF-GLT-Series
Technical data
Humidity measurement
Measuring range 0...100 % RH,
without condensation
Accuracy ±2% RH (from 30...90% RH)
Response time t
90
Approx. 25 sec. (with protection lter)
Output scaling 0...100% RH
Temperature measurement (only Type TE1)
Measuring range -30...+70 °C
Accuracy ±0.5 °K (from 0...50°C)
Output scaling -30...70 °C
General
CE-Conformance 2004/108/EG
EMV Noise emission EN 61000-6-3:2011
EMV Noise immunity EN 61000-6-1:2007
Probe dimensions See drawing
Probe housing Stainless steel 1.4571
Type -AF: polyamide
Protection lter PE-Sinter lter 25 µm
Electronics housing Plastic
Connection Screw terminals 0.75 mm
2
Connection cable 3000 mm (Type -EXT)
Operating voltage Type –10V: 12 ... 24 V AC/DC
Type –20MA: 12 ... 24 V DC
Over voltage protection Varistor and RC-Filter
Supply
For 4 ... 20 mA model, only DC supply is possible. The 0... 10 V
model can be alternatively fed with either DC or AC voltage and also
with unltered rectied voltage.
In case of AC supply, the neutral point of the transformer must be
connected to signal ground and the connection of further probes
must be absolutely done with phase balance. In case of supply with
rectied unltered voltage, the minus must be connected to reference
ground and plus to be connected to +DC/AC 24 V. Wrong connection
leads to malfunctioning or can cause damage to the electronics!
Calibration
The measuring sensors are calibrated with reproducibility of PTB
National standard. Calibration certicate as per ISO 9000 standard is
also available with some extra charges.
For re-conrming measuring accuracy by the end user, reference
cells are available for specic humidity values. For conformance to
specications, we recommend check-up at regular intervals.
Setting
The sensors are long term stable and are maintenance free in a clean
environment. Hence, a re-calibration is not required as per practice.
For the temperature and humidity channel, always a potentiometer is
provided on the motherboard by which the upward gradient can be
re-adjusted, if required. For the humidity channel, use of our humidity
reference cells is recommended as a calibration standard. The adjust-
ment of temperature channel is done with a reference thermometer.
The calibration work presupposes relevant knowledge and is only
recommended if required experience and equipment are available!
Measurement of signal voltage
In order to avoid measuring error in the 0...10 V model, due to line
resistance and current ow through the grounding wire, a separate
grounding wire is to be employed for the signal voltage. The voltage
measurement should be with a four wire system.
Protection lter
The humidity probe is supplied with a 40 µm PE sinter lter as a
standard package. Other lters, including hydrophobic special lters
are available as special accessories.
Precipitations on the lter or sensor element can deteriorate the
response behaviour. Contaminated lters should be replaced.
Connection
Preferably shielded connection cable should be used for the connec-
tion. First of all, it is to be noted that in EMI disturbed environment,
the shielding should be grounded. Check before connection, whether
the supply voltage is as per operating voltage specication mentioned
in the data sheet.
B+B Thermo-Technik GmbH | Heinrich-Hertz-Straße 4 | D-78166 Donaueschingen
Fon [phone] | Fax [phone] | [e-mail] | bb-sensors.com
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