Key Functions - Delta OHM DO 9861T Bedienungsanleitung

Aktiver und passiver feuchte und temperaturtransmitter

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ACTIVE AND PASSIVE TEMPERATURE AND HUMIDITY TRANSMITTER

DO 9861T humidity and temperature transmitters 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. The R.H. sensor is temperature compensated.

The 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 temperature

(TC), and calculate the wet bulb temperature (WT), the dew point temperature

(DP), the absolute humidity (gr/m3) and the mixing ratio (gr/kg - grams of water

per kg of dry air). The temperatures are expressed 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.

Technical characteristics DO 9861T

Capacity

Transducer energizing

Cable length

Accuracy

Working range of sensor

During use, check that the sensor is compatible with the atmosphere used

2/4 wires Pt100

Transducer energizing

Cable length

Accuracy

4,00...20,00 mA

Accuracy

Load resistance

A and B

Passive

Active

Without filter

With filter

Front panel

External dimensions

Protection class

* time required to reach 63% of the final variation.

Key functions

PRG 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 P13 the instrument returns to normal

function.

300 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%)

Relative humidity: 5...98% @ 23°C

Dew point temperature (DP°C):

- 60..+100 DP°C (-20 DP°C @ 23°C)

Temperature range: -40..+150°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

Relative humidity 0.0...+100.0% RH

Absolute humidity 0.0...+1999 gr/m3

Mixing ratio 0.0...+1999 gr/Kg of air

±2.5% RH

0.5% of reading ±0.02 mA

= Vdc-9

= 636 Ω @ Vdc = 24 Vdc

Lmax

0,022

Bistable exchange contacts 3 A/230 V ac potential

free contact

4÷20 mA, 10...35 V dc, see figure 2

24 or 230 V ac -15/+10%, 1 VA, 48...62 Hz, see

figure 1

6 seconds

3 minutes

122x120 mm

122x120x56 mm

IP64

SET 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.

TD/TW When this key is pressed the dry bulb temperature TD or the wet bulb

temperature TW is shown at the top of the display

UNIT - When this key is pressed the dew point temperature (DP), the relative

humidity (% RH), the absolute humidity (gr/m3 - grams of water per cubic

metre of dry air) or the mixing ratio (gr/kg, grams of water per kg of dry air)

EXAMPLES OF CONNECTION OF THE DO 9861T

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Fig. 1: Connection of the humidity and temperature sensor, screened cable, Pt100 4 wires +

screen, active transmitter with alternating power supply, double analog output 4÷20 mA

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Fig. 2: Connection of the humidity and temperature sensor, screened cable, Pt100 2 wires,

passive transmitter, fed with 3 wires by a regulator/indicator, double analog output 4÷20

mA.

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Key Functions - Delta OHM DO 9861T Bedienungsanleitung

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Key functions

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