Operational Check
Power options
20
Operational Check
A verification module, TSI model 053-923, may be used to check the operation of the
QUESTemp° Heat Stress Monitor. Remove the top sensor bar and plug the verification module
into the top of the unit. With the QUESTemp° set to read in degrees Celsius, verify that the
displayed readings match those printed on the module within ±0.5
C.
If the readings are not within the ±0.5
C tolerance, then have the unit serviced and calibrated.
Power options
There are three options for powering the QUESTempº 36: a 9-volt alkaline battery, a NiMH (Nickel
Metal Hydride) rechargeable 6-cell battery pack, and an AC adapter. A door on the back of the unit
allows the user access to the 9-volt battery. The rechargeable battery pack is located inside of the
unit. If the rechargeable battery pack ever needs to be replaced, it can be accessed by removing the
screws from the bottom panel of the unit.
The 2-position switch located in the battery compartment must
be set by the user if the power supply method is changed. The
up position is for the 9-volt battery. The down position allows for
either the AC adapter or the rechargeable batteries. The AC
adapter will trickle charge the rechargeable batteries if they are
in place or it will simply allow for line power operation of the unit.
Figure 1-22: 9-volt battery
9-Volt Alkaline Battery Replacement
WARNING
:
Replace batteries only in a non-hazardous environment.
The 9-volt battery should be replaced or the NiMH battery pack should be recharged when the
voltage drops below 6.4 volts. The battery voltage is displayed when the instrument is turned on.
While turned on, the battery voltage can be displayed at any time by pressing the up or down
arrow keys to move through the display until the battery voltage screen appears. If, while
operating, the battery voltage drops below 6.4 volts, the display will automatically switch to the
display showing the battery voltage along with a low battery message. After a low battery occurs,
the unit will continue to operate for approximately 8 hours. When the battery voltage falls to
6.2 volts or below, the unit will automatically turn off.
Replace only with an approved 9-volt alkaline battery.
Operational
Check
