Casella CEL Microtherm WBGT heat stress monitor - Manual (Page 14)

Warning !
DO NOT enable the charger circuit while non-rechargeable
batteries are installed.
The instrument has a built in
fast-charging circuit that uses
power applied via the 12 V DC
socket shown in Figure 6. This
allows rechargeable batteries to be
recharged in-situ.
When rechargeable batteries are to
be charged in situ, set the Charger
Enable DIP switch to ON as shown
in Figure 9.
Charging will terminate automatically once the batteries are fully charged,
which takes approxi- mately 3 hours for fully discharged batteries.
2.1.2 Temperature Sensor Array
The detachable sensor array houses three platinum resistance temperature
detectors to measure three associated ambient temperatures (see Figure 2).
1.
The wet temperature sensor is mounted vertically and has a tubular
cotton wick sheathing its length.
2. The dry temperature sensor has a radiation shield.
3. The globe temperature sensor is mounted at the other end of the
crossbar from the dry sensor.
Connect the sensor array by inserting the cable connector into the socket in
the top end of the instrument case, with the red dot facing the front of the
instrument to ensure correct pin location, then turn the large knurled ring to
tighten the security collet. (Remember to free the collet before attempting to
remove the sensor array.)
In use, the sensor array must be maintained with the crossbar horizontal to
prevent spillage from the water container during the duration of a typical
measurement (which should take at least 20 minutes on each station).
This is best achieved by standing the instrument on its foot on a horizontal
surface as shown in Figure 10, mounting the instrument on a tripod (available
from Casella CEL), or by using an extension cable to allow the sensor array to
be installed on a tripod. Extension cables are available with a standard length
of 10 m. The maximum distance between sensors and instrument is 50 m.
Serial Number Label
Factory
use only.
DO NOT
ADJUST
Charger
Enable
00060
ON 1
2
Figure 9: Location of DIP switches
Page 14 of 44
Operation MICROTHERM Heat Stress WBGT &
WinHSM Application Software - User Manual