Wizard menus for special measuring operations
11.6 Wizard menus for special measuring operations
Special measuring operations, i.e. thermal coefficient or wet bulb globe temper-
ature, require a series of sensors in a particular arrangement and function chan-
nels programmed for calculating the required variables. To ensure that these
two special measuring operations can be performed quickly and easily there is
a special wizard menu for each.
11.6.1 Thermal coefficient
To determine the thermal coefficient the two
temperature sensors are connected as re-
quired (see Manual 3.2) to channels M0 and
M1 and the heat flow plate to M2.
q
/
T1
−
T0
The temperature difference T(M1) - T(M0) is
obtained automatically on channel M9.
For this measuring operation the following pro-
gramming steps are needed :
Averaging mode of M9
CONT
or
CYCL
Averaging mode of M2
CONT
or
CYCL
Range of M12
q/dt
Enter cycle by means of
Cycle timer
To start meas. operation press
<START>
To stop meas. operation press
<STOP>
11.6.2 Wet bulb globe temperature
The stress caused in heat-exposed workplaces
can be evaluated in terms of their wet bulb
globe temperature calculated according to the
following formula :
WBGT = 0.1 DT + 0.7 HT + 0.2 GT (see Man-
ual 3.1.4)
To measure the dry temperature (DT) and the
natural humid temperature (HT) a psychrome-
ter (FN A848-WB) with turn-off motor is con-
nected to socket M0. A PT100 globe ther-
mometer is connected to socket M1. Channel
11 is programmed for WBGT; (for this device
the factor 0.2 must not be programmed).
ALMEMO
®
5690-2M
49
WET BULB GLOBE TEMP.
±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±
ry temperature: Channel:
00
00: 21.67°C Ntc
Humid temp:
Channel: 10
10: 11.42°C HT
Globe temp:
Channel: 01
01: 19.42°C P204
±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±
Wetbulbglobe temp. Channel 11
11: 17.43 °C
1 Range
WBGT
START MANU ESC
Inner temp. T0:
Channel: 00
00: 21.67°C NiCr
Outer temp. T1 :
Channel: 01
01: 11.42°C NiCr
Difference dt: Channel: 05
05: 10.25°C Diff
Averaging mode: CONT
Heat flow q
Channel: 02
02: 103.6 ¤¥
Averaging mode: CONT
±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±
±
Thermal coeff. Channel 12
12: 193. ¤mK
1 Range q/dt
Cycle timer:
00:30:00 Sn
START MANU ESC
Wizard menu for wet bulb
globe temperature
Wizard menu for thermal
coefficient