AZ Instrument 87783 Wearable Heat Index Checker Wet Bulb Instruction Manual

: July 13, 2024
: AZ INSTRUMENT

AZ Instrument 87783 Wearable Heat Index Checker Wet Bulb Instruction

Manual

OPERATION MANUAL

Wearable WBGT / HI Checker

Wearable WBGT-HI Checker

INTRODUCTION

Thank you for purchasing this wearable WBGT/HI checker. This compact checker 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.

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.

The heat index was developed by the US National Weather Service to help people avoid heat illness. Prolonged exposure and/or physical activity at a high heat index is likely to lead to sun stroke, heat cramps, heat exhaustion and even death. However, please be aware that heat index is not an exact science. The values reached are approximations. Ultimately, the final decision of whether or not to exercise or work belongs to the individual, athletic trainer or employer..

Features

Simultaneously display WBGT, HI,Temperature & RH
For outdoor & indoor heat stress measuring
Programmable buzzur & red LED danger zone warning
Audible alarm volume adjustable (75dB / 60dB / mute)
4 level dangerous level indicator on LCD
Wearable design with strap included
Display updates every 20 seconds
Functions
87784 : WBGT + HI 2 in 1
87783 : WBGT only

METER HARDWARE

Front / Rear Appearance

Symbol indication

① ABS Black Ball
② Power Key [SET] ③ up/down adjust (2 Keys)
④ Hanger
⑤ Screw to change the strap holder
⑥ Strap holder
⑦ LCD Display
⑧ Battery Cover
⑨ Screw hold for tripod

Wearable Strap

You can using the strap to fixed the checker in your helmet.
This adjustable elastic arm strap can fixed the checker when you are in outdoor activity. (Fig 1)

Tripod Mounting

You may use tripod to hold the checker vertically for long term use. (Fig 2)
A built-in thread is on the bottom side of the meter (See Fig 3)

Battery Installation

The checker powered by 2 pcs AAA batteries. To check the battery when :

First time using the checker
The battery symbol appear on LCD
The checker can not power on

To install the batteries

Turn off the checker
Put out the battery cover
Replace the old batteries with two new battery.
Make sure the batteries are in the place and the polarity is correct.
Put back the battery cover.

When to do battery replacement?

appears on the LCD when battery voltage gets low.

Please replace battery by opening the compartment on the rear of the meter.

CONTROLS AND INDICATORS

LCD display

Function Keys

Press power key to turn on the checker.
Press and hold power key for 2 seconds to turn off the checker.
In measurement mode, press [SET]key , [▲] and [▼] key simultaneously for 3 seconds till entering setting mode.
In power off status, press [SET] key, [▲] and [▼] simultaneously for 5 seconds till entering RESET mode.
In normal mode, press [▲] or [▼] key to adjust the sound level.
In setting mode, press [▲] or [▼] button to adjust the value of thresholds or ON / OFF the alarm.

OPERATING INSTRUCTIONS

1. POWER

Press to turn on(press1 second) and turn off (press 2 seconds) the meter. All indicators are shown on the LCD when power on(Fig.4), and then enter measuring mode. You will see the firmware version on the LCD for 1 second while power on.(Fig.5)

2. MEASUREMENT

When into to measurement mode, the WBGT value, temperature and humidity display on the screen. (See Fig 6)

3. SOUND LEVEL

User can press the [▲] or [▼] key to adjust the volume of the alarm. In measuring mode, press [▲] or [▼] key to adjust the volume in 0dB > 60dB >75dB respectively. The symbol will show as Fig 7.

Note: There is no buzzer icon displays on the LCD while the sound is 0dB.

4. DANGER ZONE INDICATOR

There have 4 level heat stress danger zone indicator on the top of the LCD. This works on both WBGT & HI The symbol will show as Fig 8.

5. ALARM

While the measured heat stress value is over alarm threshold, red LED, buzzer and measured value will all blink every second as reminder. After 30 seconds, it beeps 1 time per minute. User can terminate the beep sound at any time when pressing [ ▼ ] key. The alarm threshold value can be re-programmed. Check “SETUP” section in page 7 for the details.

SETUP

This function allow users to customize their own checker. Press key+ [▲]+ [▼] key simultaneously for 3 seconds to enter setting mode. The Checker will return to normal display while keys are inactived for 30 sec in setup mode.
For 87783, it is only related WBGT.
For 87784, WBGT & HI (Heat Index) is switchable by user.

IN/OUT SWITCH (ONLY for WBGT mode)

This function is to calculate WBGT without [IN] or with [OUT] direct sun exposure.
Under IN/OUT modes, press [▲] or [▼] to switch [IN / OUT ] then press key to confirm. (see Fig. 9 & 10)

ALARM THRESHOLD SETTING

This function allows users to customize alarm threshold or stay at factory default alarm threshold. While choosing to stay at factory default alarm threshold, please select [OFF]. [OFF] means to turn off customization function.

The default alarm-threshold is defined in below and each range has different buzzer frequence to distinguish.

If user decide to customize their own alarm threshold, select [ON], [ON] means the alarm threshold setting is turned ON by user. (see Fig 12 & 13)

The adjustment range is listed below.

Press [▲] or [▼] key to adjust alarm value. Press key to save the value.The adjustment is 0.1per step. The adjustment range is 20~50C for WBGT and 20~60C for HI.

Special Note:

If user prefer to monitor the heat stress in a completely silent way, following procedure can block the alarm function so LED, buzzer and alarm related icons are all off.

While adjusting alarm threshold value, pressing [▲] and [▼] key simultaneously.

The alarm threshold will show [–.-]on the LCD (see Fig 14). Press [▲] and [▼] again to revert the status.

TEMPERATURE UNIT °C / °F

Press [▲] and [▼] key to switch °C (degrees Celcius) or °F (degrees Farhenheit). Press key to save the selection. (See Fig 15 & Fig 16)

WBGT / HI SWITCHING (87784 ONLY)

In 87784, the main displayed heat stress index can be WBGT or HI. While the temp unit setting completed, pressing [▲] or [▼] key to switch WBGT/HI and then press key to confirm.(See Fig 17 & 18)
Then, the checker will return to measurement mode after upon all setting are completed.

RESET FUNCTION

This allows user RESET the checker to default setting. In POWER OFF status, press [SET], [▲]and [▼] key simultaneously for 5 seconds till [rSt] symbol show on the LCD in 5 seconds. Then full display will be turned on and go to measurement mode automatically.(See Fig 19)

The default status of each setup parameter is:

MATERIALS SUPPLIED

This package contains :

Meter x 1 pc
AAA Size Batteries x 2 pcs
Operation manual x 1 pc
Fixing Strap x 1 pc
Buckles x 2 pcs

SPECIFICATION

TROUBLE SHOOTING

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.

APPENDIX

WBGT &Physical exercise

Source: Manual of Naval Preventive Medicine (NAVMED P-5010)

Heat Index Chart

Accuracy, the Zenith of
Measuring / Testing Instruments !

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