lab report need in 5 hours

EHST 3701: Industrial Hygiene Laboratory

LABORATORY EXERCISE ON LIGHT MONITORING

I. Introduction

II. ObjectiveS

At the end of the session each student should be able:

1. To conduct illumination measurements

2. To analyze and interpret the results obtained

3. To give recommendations based on findings

III. Equipment and materials

1. Light meter, Extech Model EA30

IV. Methodology

A. Use of the Instrument

1. Make sure that the protective cap is on the white domed light sensor. Press the orange power button to turn power on. The meter will automatically perform a zero calibration.

2. Select the desired unit of measure (Lux or Fc). Select LUX for this experiment.

3. Remove the protective cap from the sensor and place the white domed light sensor on the surface (i.e. counter top) you would like to monitor. The light being measured must encompass the entire white sensor dome. NOTE: Do not block the light source while reading the display.

4. Read the light level on the LCD. If the light measurement is out of range, an “OL” indication will appear on the display. If the “OL” appears, select another range by pressing the RANGE button.

5. Take note of the illumination level measurements (minimum and maximum).

a. Press the MX/MN button 3 times to have the meter continue to record the highest and lowest readings (MX and MN icons is displayed on the upper left-hand portion of the LCD).

b. Press the MX/MN button once to put the meter in MX mode to display only the maximum reading (MX is displayed).

c. Press the MX/MN button again to put the meter in MN mode to display only the minimum reading (MN is displayed).

d. To exit the MX MN mode, press and hold the MX/MN button until the MX and/or MN icons disappear.

6. Press the orange power button to turn power off.

B. Illumination Monitoring

Sampling location: Laboratory

1. Perform a brief walk-through of the areas for monitoring.

2. Draw a layout of the area to be monitored.

3. Discuss and determine the location of sampling points. Measure at least 15 sampling points. Prioritize the working surfaces that are likely to be used by the lab user.

4. Perform actual illumination measurement using the light meter. Obtain the illumination levels in lux unit and slow response time.

5. Record data obtained from the monitoring and develop an illumination map.

V. Points For discussion

Note: Please use complete sentences when addressing the questions below for your discussion.

1. Describe the illumination levels in the area monitored (i.e. where the lowest and highest lighting occurs, source of lighting, etc.)

2. Are the illumination levels measured acceptable? What recommended illumination level/s did you compare your results with? Explain why you chose those levels.

3. What control measures do you recommend?

VI. RECOMMENDED ILLUMINATION LEVELS

Activity	Illumination (lux)
Public areas with dark surroundings	20 – 50
Simple orientation for short visits	50 – 100
Working areas where visual tasks are only occasionally performed	100 – 200
Performance of visual tasks of high contrast or large size	200 – 500
Performance of visual tasks of medium contrast or small size	500 – 1000
Performance of visual tasks of low contrast or very small size	1000 - 2000
Performance of visual tasks of low contrast and very small size for prolonged periods of time	2,000 – 5,000
Performance of very prolonged and exacting visual tasks	5,000 – 10,000
Performance of very special visual tasks of extremely low contrast and small size	10,000 – 20,000

Activity	Minimum Illumination (lux)
Warehouses, homes, theaters, archives	150
Easy office work, classes	250
Normal office work, PC work, study library, groceries, show rooms, laboratories	500
Supermarkets, mechanical workshops, office landscapes	750
Normal drawing work, detailed mechanical workshops, operation theaters	1,000
Detailed drawing work, very detailed mechanical works	1,500 – 2,000

VII. CONCLUSION

ILLUMINATION mAP Illumination Monitoring Worksheet

Date of Monitoring: ___________________________________________

Instrument Used: ____________________________________________

Sampling Location	Sampling Pt. No.	Operation / Activity	Time of Msmt	Illumination level (lux)	Remarks
				Min	Max
Carol belk building room 3501 for sample 1-15
			12:06pm	890	968
			12:08pm	886	1013
			12:09pm	1022	1030
			12:10pm	656	879
			12:11pm	684	692
			12:12pm	1140	1163
			12:13pm	1201	1231
			12:14pm	1072	1123
			12:15pm	853	904
			12:15pm	1002	1035
			12:16pm	1005	1014
			12:16pm	807	827
			12:17pm	155	205
			12:18pm	755	782
			12:19pm	998	1055

EHST 3701: Laboratory Exercise on Noise Monitoring Page 1

EHST 3701: Laboratory Exercise on Light Monitoring Page 5