10
IV – Menus
Press the access key . Press
in order to enter in the submenu and choose calculation type (none, psychrometer or WGBT) by
means of arrows keys
and
.
Confirm with
OK
. Select
Esc
to quit this menu.
Wet Temperature (Tw)
is the temperature at which water evaporated into the air brings the air to saturation at the same temperature. It is
expressed in Celsius degree .
Absolute humidity (
ρ
V)
is the ratio between the mass of water vapor present to the mass of dry gas. It is expressed in grams of water
vapor per kiRecrams of dry gas.
Dew-point temperature (Td)
: is the temperature to which the air must be cooled, at constant barometric pressure for water vapor to
condense into water. It is expressed in Celsius degree.
Contact dew-point temperature (Td)
is the dew point temperature measured by a PT100 contact probe. It is expressed in Celsius degree.
Specific enthalpy
(i)
is the total heat contained in 1 kg of wet air. It is expressed in kJ/kg.
•
Psychrometer
●
WBGT index (Wet bulb globe temperature).
For hygrometry probe coupled with black ball thermometer.
If WBGT index is selected, press
then
OK
or
and a list appears. Select
Inside
or
Outside
with arrow
and
.
Confirm with
OK
.
The
WBGT
, described as per
ISO 7243
, allows an evaluation of working climatic conditions.
Outdoors, the following formula is used:
WBGT
outside
= 0.7 Thn + 0.2 Tg + 0.1 Ta
Indoors, It is calculated from the following formula :
WBGT
inside
= 0.7 Thn + 0.3 Tg
where: -
Thn
is the natural wet temperature,
-
Tg
is the temperature measured with a black ball thermometer
- and
Ta
is the ambient temperature.
Calc.
Calculations
Air quality
The following functions are enabled only if at least one probe is connected:
-
Hold
(Hold – Min/Max) – see Temperature
-
Config
(Configuration) - see Air velocity
-
∆
T
(Delta T) – see Temperature
-
Calc.
(Calculation) – see hygrometry
-
Alarms
-
Rec
(Recording) - see Air velocity
-
Params
(Parameters) - see Air velocity
Hygrometry
The following functions are enabled only if at least one probe is connected:
-
Hold
(Hold – Min/Max) – see Temperature
-
Config
(Configuration) - see Air velocity
-
∆
T
(Delta T)
-
Calc.
(Calculation)
-
Alarms
- see Air quality
-
Rec
(Recording) - see Air velocity
-
Params
(Parameters) - see Air velocity
