General Tools & Instruments 8758, 8778 Instruction Manual

OPERATION MANUAL

HEAT INDEX WBGT METER

8758

Model:

8778

8758
8778

INTRODUCTION

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

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 Occup ational
Health in establishing the permissible
heat exposure limits in occupational
health, sports or other physical activities.
(See appendix)

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

Featu res:

Direct measu remen t of the ra diati on
effec t with a br ass bla ck ball .
Adjustable W BGT ala rm thre shold
Audible beeper for he at stre ss
monit oring
Sensor prote cting m echan ism
Easy se lf cali brati on for hu midit y
PC connect for d ata ana lysis

1

CONTROLS AND INDICATORS

LCD dis play

Symbo l indic ation

WBGT Wet Bul b Globe Temper ature
TG Blac k Globe Tem perat ure
TA Air Tem perat ure
% Relat ive Hum idity
C/F Cel sius/ Fahre nheit
IN Indo or (no su n)
OUT Out door (full sun)
Low bat tery in dicat or
DP/RE C Vain ico ns in the se
model s.

Funct ion Key s

Turn on an d off the m eter
Enter a larm se tting m ode

NEXTNEXT

Selec t digit i n setti ng mode

Exit fr om sett ing mod e

MODEMODE

Selec t displ ay mode
Shift I N/OUT mode
Incre ase val ue in set ting

MODEMODE

+ Set as no n-sle ep

MODEMODE

NEXTNEXT

+ Selec t C or F
+ + Enter R H calib ratio n

MODEMODE

NEXTNEXT

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OPERATING INSTRUCTIONS

Pul l up to
pro tect se nsor
Des ign pat ent
pen ding

1. POWER ON/O FF

Press t o turn on a nd turn o ff the
meter. Al l indic ators a re show n on

the LCD w hen pow er on, an d then
enter m easur ing mod e.

2. MEASUREM ENT

Slide d own the p rotec ting sh eath
of sens or befo re meas ureme nts.

Selec t displ ay mode

The met er meas ures TA(A ir Temp),
TG (Glo be Temp .), RH (R elati ve
Humid ity), a nd calc ulate s WBGT.
Press t o selec t modes . An icon
shows o n the top t o indic ate the
curre nt oper ation m ode. (F ig. A)

MODEMODE

Fig. A

IN/OU T switc h
To measur e WBGT witho ut or wit h
direc t sun exp osure u nder IN /OUT
modes , hold do wn for mo re

MODEMODE

than 1 se cond to s witch .

Selec t Unit
Press a nd simu ltane ously i n
measu ring mo de to sel ect C or

MODEMODE

NEXTNEXT

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F.