MRC 8758 Manuel utilisateur

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 Adminis-

tration), 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

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 heat-

related injuries

(See appendix)

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

+ Select C or F

+ + Enter RH calibration

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.

NEXTNEXT

MODEMODE

NEXTNEXT

MODEMODE

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

measuring mode to select C or

oF.

OPERATING INSTRUCTIONS

MODEMODE

NEXTNEXT

MODEMODE

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

3. ALARM SETTING

The meter features audible alarm

to give warning for possible heat

stress in the environment. When

WBGT value reaches the alarm

threshold, the value starts to blink

with continuous beep(about 70 dB).

The alarm stops when measured

value falls below the threshold or

the meter is turned off.

The alarm threshold is adjustable

for different applications. Hold

down for 2 seconds to turn on

the meter and enter alarm setting.

The current setting displays with a

blinking digit. Press to increment

the value and to select digit.

After new alarm threshold is set,

press for 2 seconds to return to

measuring mode.

The setting range is 20.0~37.2 C

(68.0~99.0 F). "OUT" will show if

setting is out of range. (Fig. B)

MODEMODE

NEXTNEXT

Fig. B

4. BATTERY REPLACEMENT

appears on the LCD when battery

voltage gets low. To replace battery

by opening the compartment on the

rear of the meter.

Unscrew the black

globe with sensor

sheath (see pic. A)

before calibration.

Follow the illustration

on page 7 to recap

sensor sheath after

completing calibration.

Pic. A

The meter can be calibrated on the

humidity by end users with 33% and

75% salt solution. The ambient

condition is recommended to be at

23+/-2 C and stable humidity. Users

can terminate the calibration anytime

by turning off the meter.

RH CALIBRATION

6. TRIPOD MOUNTING

The meter can fit on a tripod for long

time monitoring. A built-in thread is

on the rear side of the meter.

5. AUTO POWER OFF

The meter turns off automatically

after 20 minutes non-operation.

To override the function, hold down

and for 2 seconds to turn on

the meter. The LCD will display “n”

and then enter measuring mode.

(Fig. C)

MODEMODE

Fig. C

Sensor

probe

Sensor

connector

Black globe

with sensor

sheath

Note:

The RH value difference between the

meter display and calibration standard

should be within +/-0.3%, otherwise

it is a failed calibration.

The blinking “7X.X%” shows on the

screen and meter is now calibrating.

Wait about 60 mins.until blinking stops

,it means the calibration is completed

and meter returns to measuring mode.

75% calibration

After 33% calibration, plug the sensor

probe into 75% salt bottle, then press

for 2 seconds to start.

MODEMODE

33% calibration

Plug the sensor probe into 33% salt

bottle(Pic A1),hold down , ,and

buttons for 2 seconds to power on the

meter until blinking “3X.X%” appears.

Meter is now calibrating, and will finish

in about 60 mins. when the value stops

blinking.

Note:

Strongly recommend to use one hand to

press one button, and use two fingers

of the other hand to press two buttons

simultaneously . This is easier for you

to operate 3 keys.

MODEMODE

NEXTNEXT

Pic.A1

Salt solution

CAUTION:

Reassemble the globe with caution by

fitting the pin (Pic. B) into the connector

(Pic.C). It helps to position by targeting

the screw holes on the sheath and the

meter. Incorrect installation may

damage the sensor.

Sensor

connector

Pic.B

Pic.C

Important:

Screw holes

for targeting

to assemble

the globe.

Pic. D

? Error message on the display

E2: The value is under range. Improper

sensor installation.

E3: The value is over range.

E4: The value is in error because of

the original data. Improper sensor

installation.

E11: RH calibration error. Do the

calibration again.

E32/E33: Circuit error. Return to the

vendor for repair or replacement.

? Power on but no display

Check whether the batteries are in

good contact and correct polarity, or

take out the batteries for one minute

and reinstall and retry.

? Calibration failure

a.Check the battery voltage or replace

with new batteries.

b.Check whether the sensor is well

plugged into the salt bottle and no air

comes in. Check ambient condition.

TROUBLESHOOTING

RS232 INTERFACE

The meter can do PC link for

data analysis

on-line

logging and via RS232

interface and software.

The protocol is as follows.

B.Format

(Transmitting ASCII code by every

second while meter is on.)

Wxxx.xC(F):Txxx.xC(F):Txxx.xC(F)

:Hxx.x%LRCCRLF

Note: The 1st value is WBGT, the 2nd is

TA, the 3rd is TG, and the 4th is RH.

A.9600 bps, 8 data bits, no parity.

SPECIFICATION

8758 8778

Black ball size 40(D)x35(H)mm 75(D)x75(H)mm

Air Temp. range 0~50℃ (32~122℉)

Air Temp. accuracy ±0.6℃

Globe Temp. range 0~80℃ (32~176℉)

Indoor ±2℃ (15~40℃)

±2.5℃ (Others)

±1℃ (15~40℃)

±1.5℃ (Others)

Globe

Temp.

accuracy Outdoor ±3℃ (15~40℃)

±3.5℃ (Others)

±1.5℃ (15~40℃)

±2℃ (Others)

WBGT Temp. range 0~50℃ (32~122℉)

WBGT Formula

Indoor/Outdoor and no sun:

WBGT=0.7WB + 0.3TG

Outdoor and full sun:

WBGT=0.7WB + 0.2TG + 0.1TA

RH range 0~100%

RH accuracy ±3% (10~90%RH)

±5% (other range)

Resolution 0.1℃/℉, 0.1%RH

Response time 15 seconds typical

Operating condition 0~50℃, 0~95% RH

Storage condition -20~65℃, 0~95% RH

Meter size 40(H)x48.7(W)x254(L)mm – 8758

75(H)x75(W)x278.2(L)mm – 8778

Battery life

(without beep)

1000 hours (Alkaline)

250 hours (General purpose)

MATERIALS SUPPLIED

Meter

2pcs AAA batteries

Operation manual

Plain box packaging

This package contains:

Optional accessory:

33% calibration salt (VZHR33AZ)

75% calibration salt (VZHR75AZ)

RS232 cable and software

WARRANTY

The meter is warranted to be free from

defects in material and workmanship

for a period of one year from the date

of purchase. This warranty covers normal

operation and does not cover misuse,

abuse, alteration, neglect, improper

maintenance, or damage resulting from

leaking batteries. Proof of purchase is

required for warranty repairs. Warranty is

void if the meter has been opened.

RETURN AUTHORIZATION

Authorization must be obtained from the

supplier before returning items for any

reason. When requiring a RA (Return

Authorization), please include data

regarding the defective reason, the meters

are to be returned along with good packing

to prevent any damage in delivery and

insured against possible damage or loss.

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