Key Functions - Delta OHM DO 9761T Bedienungsanleitung

DO 9761T and DO 9861T humidity and temperature transmit-
ters convert the humidity and temperature measured by two
sensors into a 4÷20 mA signal.
An LCD indicator allows the value of the process signal and the various
parameters to be displayed.
The accurate design and choice of components make the instruments
precise and reliable for a long working life.
Both instruments have two sensors, a capacitive sensor for measuring
relative humidity and a Platinum resistive sensor (Pt100, 100 Ω at 100°C)
for measuring temperature.
The transmitters measure the relative humidity (% RH), the sensor tem-
perature (TC), and calculate the wet bulb temperature (WT), the dew
point temperature (DP), the absolute humidity (gr/m
(gr/kg - grams of water per kg of dry air). The temperatures are expres-
sed in degrees Celsius.
The measurements refer to an atmospheric pressure of 1013.25 mBar.
Once the physical quantity to be checked has been selected, the output
current will be proportional and the status of the relays will depend on
that variable.
Characteristics
Technical characteristics DO 9761T
Capacity 390...570 pF
Transducer energizing 10 kHz
Cable length <10 m multiple screen (about 2 nF)
additional error about 0.003 pF/pF
Accuracy Instrument: 0.1% of reading ±1 digit ±0.01%/°C
Sensor: ±2.5% (5...90%), +3/-2.5% (90...98%)
Sensor work range -30...+130°C
During use, check that the sensor is compatible with the atmosphere used
-50...+199.9°C
2/4 wires Pt100
Transducer energizing 0.5 mA DC
Cable length <10 m not screened
<50 m screened (about 5 nF)
Accuracy 0.2°C ±0.1% of reading ±0.01°C/°C
4.00...20.00 mA Dry bulb temperature -199.9...+199.9°C
Wet bulb temperature -199.9...+199.9°C
Dew point temperature -199.9...+199.9°C
Relative humidity -199.9...+199.9% RH
Absolute humidity -1999...+1999 gr/m
Mixing ratio -1999...+1999 gr/Kg of air
Accuracy ±2.5% RH
0.5% of reading ±0.02 mA
A and B Bistable exchange contacts 3 A/230 V ac potential
free contact
Passive 4÷20 mA, 10...35 V dc, see figure 2
Active 24 or 230 V ac -15/+10%, 1 VA, 48...62 Hz, see figure 1
Front panel 122x120 mm
External dimensions 122x120x56 mm
Protection class IP64
Safety EN61010-1 level 3
Electrostatic discharges EN61000-4-2 level 3
Fast electric transient EN61000-4-4 level 3
High energy transient EN61000-4-5 level 3
Voltage variation EN61000-4-11
Sucseptibility to IEC1000-4-3 10 V/m
electromagnetic interference
Emission of EN55020 class B
electromagnetic interference
DO 9761T
Technical characteristics DO 9861T
Capacity
Transducer energizing
Cable length
Accuracy
Sensor work range
During use, check that the sensor is compatible with the atmosphere used
2/4 wires Pt100
Transducer energizing
3 ) and the mixing ratio
Cable length
Accuracy
4.00...20.00 mA
Accuracy
A and B
Passive
Active
Front panel
External dimensions
Protection class
Safety
Electrostatic discharges
Fast electric transient
High energy transient
Voltage variation
Sucseptibility to
electromagnetic interference
Emission of
electromagnetic interference
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Key functions

PRG
SET
TD/TW When this key is pressed the dry bulb temperature TD or the wet
UNIT
OK
CAL
s
t
6
390...570 pF
10 kHz
<10 m multiple screen (about 2 nF)
additional error about 0.003 pF/pF
Instrument: 0.1% of reading ±1 digit ±0.01%/°C
Sensor: ±2.5% (5...90%), +3/-2.5% (90...98%)
-30...+130°C
-50...+199.9°C
0.5 mA DC
<10 m not screened
<50 m screened (about 5 nF)
0.2°C ±0.1% of reading ±0.01°C/°C
Dry bulb temperature -50.0...+199.9°C
Wet bulb temperature -50.0...+199.9°C
Dew point temperature -50.0...+199.9°C
Relative humidity 0.0...+100.0% RH
Absolute humidity 0.0...+1999 gr/m
Mixing ratio 0.0...+1999 gr/Kg of air
±2.5% RH
0.5% of reading ±0.02 mA
Bistable exchange contacts 3 A/230 V ac potential
free contact
4÷20 mA, 10...35 V dc, see figure 4
24 or 230 V ac -15/+10%, 1 VA, 48...62 Hz, see figure 3
122x120 mm
122x120x56 mm
IP64
EN61010-1 level 3
EN61000-4-2 level 3
EN61000-4-4 level 3
EN61000-4-5 level 3
EN61000-4-11
IEC1000-4-3 10 V/m
EN55020 class B
Programming of the parameters is activated by pressing the
PRG key along with the and keys. The message P1 appears on
the display to indicate that parameter P1 is being programmed.
When the PRG key is pressed in sequence the messages P2,
P3, etc. appear as well as the corresponding parameters. After
P7 (P13 for the DO 9861T the instrument returns to normal func-
tion.
Key for setting the relay intervention threshold. The ON or OFF
symbol appears on the display to indicate that the instrument is
showing the switching on or the switching off threshold of relay A
or relay B.
bulb temperature TW is shown at the top of the display.
- When this key is pressed the dew point temperature (DP), the
relative humidity (% RH), the absolute humidity (gr/m
of water per cubic metre of dry air) or the mixing ratio (gr/kg,
grams of water per kg of dry air) is shown at the bottom of the
display.
- When pressed along with the CAL key it activates the humidity
sensor calibration function.
Confirms the programming parameters, or the relay SET values,
and stores them.
- When pressed along with the UNIT key it activates the humidity
sensor calibration function.
- Key used to confirm the calibration of the humidity sensor.
- Key used to increase the value displayed during programming
of the parameters.
- During programming of the relay SET points.
- During calibration.
- Key used to decrease the value displayed during programming
of the parameters.
- During programming of the relay SET points.
- During calibration.
3
3 - grams