MRC 8758, 8778 Operation Manual

OPERATION MANUAL

HEAT INDEX WBGT METER

Model:

8758
8778

8758

8778

INTRODUCTION

WBGT(wet-bulb globe temperature) was
developed as a monitoring basis at US
military training camps and became
widespread for the use in workplaces
and sports situations. It is suggested in
an international standard ISO 7243 and
many governments such as OSHA (US
Occupational Safety & Health Adminis­tration), SMA(Sports Medicine Australia),
and Japan Society for Occupational
Health in establishing the permissible
heat exposure limits in occupational
health, sports or other physical activities.

The applications of the heat index can be
in construction, iron and steel foundries,
bricks-firing plants, glass facilities, boiler
rooms, mining sites, army training,
marathon, beach activities and so on.

Features:

Direct measurement of the radiation
effect with a brass black ball.
Adjustable WBGT alarm threshold
Audible beeper for heat stress
monitoring
Sensor protecting mechanism
Easy self calibration for humidity
PC connect for data analysis

1

Thank you for purchasing the Heat Index
WBGT meter. The handy meter measures
air temperature, globe temperature, and
humidity to give heat stress index for
using in control of physical activity in hot
environment to limit the danger of heat­related injuries

(See appendix)

2

CONTROLS AND INDICATORS

LCD display

Function Keys

Turn on and off the meter
Enter alarm setting mode

Select digit in setting mode

Exit from setting mode
Select display mode
Shift IN/OUT mode
Increase value in setting
+ Set as non-sleep

o

+ Select C or F
+ + Enter RH calibration

o

Symbol indication

WBGT Wet Bulb Globe Temperature
TG Black Globe Temperature
TA Air Temperature
% Relative Humidity
C/F Celsius/Fahrenheit
IN Indoor (no sun)
OUT Outdoor (full sun)
Low battery indicator
DP/REC Vain icons in these
models.

NEX TNEX T

MOD EMOD E

MOD EMOD E

MOD EMOD E

NEX TNEX T

NEX TNEX T

MOD EMOD E

IN/OUT switch
To measure WBGT without or with
direct sun exposure under IN/OUT
modes, hold down for more
than 1 second to switch.

Select Unit
Press and simultaneously in

o

measuring mode to select C or

o

F.

3

OPERATING INSTRUCTIONS

MOD EMOD E

MOD EMOD E

NEX TNEX T

MOD EMOD E

1. POWER ON/OFF

Press to turn on and turn off the
meter. All indicators are shown on

the LCD when power on, and then
enter measuring mode.

2. MEASUREMENT

Slide down the protecting sheath
of sensor before measurements.

Pull up to
protect sensor
Design patent
pending

Select display mode

The meter measures TA(Air Temp),
TG (Globe Temp.), RH (Relative
Humidity), and calculates WBGT.
Press to select modes. An icon
shows on the top to indicate the
current operation mode. (Fig. A)

Fig. A