
4 Transmitter
16
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4.2.3.
Display and keypad
The display option allows operation of the testo 6781 transmitter via
the display and four keys.
The LCD display consists of one 7-segment line for displaying
readings and units and of an information line (for status messages,
for example).
The brightness and contrast of the display and the background
lighting (permanent or off) can be changed via the user menu or the
P2A software.
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4.2.4.
Service interface
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The parameterizing socket (mini-DIN) is located behind the service
flap as an interface to the P2A software.
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4.2.5.
Analog outputs
As analog outputs, the testo 6781 has either
•
1 current output of 0 to 20 mA (4-wire)/4 to 20 mA (4-wire) or
•
1 voltage output of 0 to 1 V/0 to 5 V/0 to 10 V (4-wire)
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4.2.6.
Parameters
The following parameters are displayed:
•
Relative humidity in % RH (technical)
•
Degree of humidity in g/kg and gr/lb
•
Absolute humidity in g/m³ and gr/ft³
•
Water content in ppm (vol)
•
Dewpoint temperature in °C
td
and °F
td
•
Standardized dewpoint (at atmospheric pressure 1013 hPa) in
°C
tdA
and °F
tdA
•
Temperature °C and °F
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Содержание 6781
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