Parameters - TESTO 6381 Instruction Manual

4 Transmitter
• 1 or optionally 3 voltage outputs of 0 to 1 V/0 to 5 V/0 to 10 V
(4-wire).
The transmitter can be ordered with three analog outputs as an
option.
The optional three channels are galvanically isolated.
4.2.7.

Parameters

The following parameters are displayed
• Differential pressure in Pa, hPa, kPa, mbar, bar, mmH
kg/cm
• Volumetric flow rate
• Flow
• Relative humidity in % RH (technical)
• Relative humidity in % WMO* (calculation according to the
WMO standard)
• Degree of humidity in g/kg and gr/lb
• Absolute humidity in g/m³ and gr/ft³
• Water content in ppm (vol) and % vol
• Psychrometer temperature in °C
• Enthalpy in kJ/kg and BTU/lb
• Water vapour partial pressure in hPa and H
• Dewpoint temperature in °C
• Standardized dewpoint in °C
pressure (1013 hPa); precondition: Absolute process pressure.
* It is possible that condensation appears as of a displayed
humidity starting from 70 % and is shown on the display. This
unit is used in meteorology, amongst others. When calculating
the relative humidity the Magnus coefficient with undercooled
water is used in accordance with WMO.
• Dewpoint of H
• Mixture humidity H
• Temperature °C and °F
Calculated
3
To prevent fluctuating flow rate values at the zero point (depressurized), the flow rate values are only
4
calculated as of differential pressures > 0.2 Pa or > 0.1 % of the respective measuring range (whichever is the
greater). With smaller differential pressures, the flow rate value remains at 0.00 m/s.
16
2
, PSI, inch HG, inch H
3 in m
4 in m/s, ft/min
Calculated humidity variables correspond to the medium of
air. With other gases/gas compositions, deviations may
occur, e.g. with the enthalpy.
O mixture in °C
2 2
O
2 2
O
2
3 /h, l/min, Nm 3 /h, Nl/min
and °F
tw
and °F
td td
standardized at atmospheric
tdA ,
and °F
tm tm
in %RH
m
O,
2
tw
O
2