Cooper Lighting Solutions Fail-Safe User Manual

Fail-SafeGermicidal UV Upper Air

Commissioning and

Ongoing Maintenance

Measurement Guidelines

November 30, 2020

Before You Begin:

Read and understand this entire guide, the luminaire installation
instructions, and any site-specific documents before attempting to install,
commission or operate these luminaires. Failure to read and follow all
provided instructions may result in damage or injury.

It is the responsibility of the installer to
ensure that persons will not be exposed to
excessive UV radiation during equipment
operation. This will require the installer to
conduct an assessment of irradiance levels
per the instructions listed in this document
in the surrounding occupied spaces prior
to occupancy and to repeat assessment
whenever relamping is completed.

This document applies to following products:

Fail-Safe GAC - Germicidal UV 2x2 Grid Ceiling Mount
Fail-Safe GAW - Germicidal UV Louvered Wall Mount

Table of Contents

General Instructions and Materials Required

Step 01: Establish Baseline

Step 02: Eye Level Safety measurements

AA

Step 03: Documentation and Deliverables

Final Notes and Appendices

Germicidal U V Upper Air 1

General Instructions and Materials Required

Upper Air Germicidal UV
radiation measurements
must be taken:

• Upon initial installation

• Whenever new lamps are installed

• Whenever modifications are made to the room or
upper air installation conditions

(e.g. height, position, change of walls or ceiling material, room dimension changes, etc.)

• Whenever any reports or complaints of possible
overexposure are received, or is reasonably
expected

Required Materials (sold separately)

Personal protective
equipment (PPE):

• Safety glasses with side panels

• Long sleeve shirt, long pants

and closed toe shoes

• Skin protecting gloves

1

• Sunblock cream

(containing either zinc oxide or
titanium dioxide for head, neck,face
and other areas of exposed skin)

1. National Ins titute for Occupational Safety and Health. Atlanta, GA: National Institu te for Occupational Safety a nd Health; 2009.

Environmental control of tuberculosis: basic upper-room ultraviolet germicidal irradiation guidelines for healthcare settings.

2. ICNIR P (2007) Prote cting Worker s from Ultraviolet Radiation

3. End TB Transmissio n (ETTI) (2019) Maintenance of Upper-Roo m Germicidal Ultraviolet (GUV) Air Disinfection Systems

for TB Transm ission Control, Sto p TB Par tnership, Ge neva, S witzerland. www.stoptb.org/wg/ett /resources.

4. ACGIH. (2 017). TLVs® and B EIs®. Americ an Conferen ce of Governme ntal Industrial Hyg ienists, Ci ncinnati, O H.

Calibrated X1-5 Optometer

- Gigahertz - Optik

• Step 1: For output range of

1-50 μW/cm², calibrated at first
decimal (0.1 μW/cm²)

• Step 2: For measuring safety level

at 0.2 μW/cm² calibrated to second
decimal (0.01 μW/cm²)

Measuring tape and
documentation materials

Ladder and Tripod

UV-3725-4 Radiometric
Detector. UV-C 254nm
irradiance with cosine
corrected field-of-view.
Gigahertz -Optik

UV- 3718Z-01 Detector
Accy: 80° FOV adapter
for UV-3718 detector

2, 3, 4

2 Fail-Safe

Premeasurement Actions

• Prior to the installation, Cooper Lighting Solutions recommends 100hr burn-in of the lamps.

Once the burn-in is complete, the lamps will be stable and considered abaseline for

commissioning measurement.

Failure to complete the 100hr burn-in could result in higher initial readings. The space should
never be occupied by humans or pets prior to completing all measurements.

• Make sure you have the latest site documents including latest architectural and electrical
drawings, simulated calculation report (if performed), list of surface materials and reflectance
values (see Appendix B), site audit notes or previous measurements (if applicable) to compare
with the current situation.

• Check if the usage of the space (occupant tasks, hours occupied, etc) is the same as it was
when the system was designed. If there is a change, register it.

• Look for obstacles (hanging from the ceiling or higher objects from the floor) that may interfere
with the UV-C light, register them.

• Check if there are nearby items (smoke detectors, alarms, projectors, wi-fi routers, etc.) with

materials or paint that can be degraded by UV-C and advise thecustomer.

• Energize luminaires and allow to stabilize for 10 minutes prior to beginning any measurements.

• Thoroughly clean the sensor lens according to sensor manufacturer instructions or with
Isopropyl Alcohol before beginning measurements.

1

• Look for standard luminaires installed in the ceiling directly in the irradiance path that may reect

light into the occupied zone. Cooper Lighting Solutions recommends moving or removing these.

1. ASH RAE GPC 37 (D raft).

Germicidal U V Upper Air 3

Step 01: Establish Baseline

Instructions for
Measuring

1. Acquire all necessary PPE.

2. Zero the UV meter according to the meter manufacturer’s
instructions.

3. Remove the cap and position the sensor 3ft (0.91m)
from the center of the upper-room GUV luminaire.

4. Point the sensor probe vertically, aiming in the beam ofthe

luminaire, the center of the sensor should be inthe center

of the UV-C beam.

5. Record the reading in the log book, this is the initial
baseline output to be referenced by all future readings after
replacement lamps are installed.

1

Figure 1

Figure 1: The detector is raised and lowered to find maximum output (irradiance) of

the UV beam for recording output. If allowed, permanent marker on the floor would

facilitate repeat measurement. Or use a yard/meter stick between the face of the

luminaire and the GUV radiometer’s detector.

6. Repeat steps 1-6 at 6ft (1.83m) from the center
of the upper-room GUV luminaire.

7. Compare results to Appendix A: Dosing Recommendations.
If above max permissible UV exposure, disconnect the

device and notify Facilities/Owner.

Note: Upon luminaire relamping and/or cleaning, changes to site

conditions (painting, installation of new luminaire in the irradiance path,
changing or resurfacing reflective surfaces, installation of obstructions in

the irradiance path, etc.) and/or changes to site usage, repeat steps 1-7.

1, 2

1. End TB Transmission (E TTI) (2019) Maintenanc e of Upper-Room Germici dal Ultraviolet (GU V)

AirDisinfection Systems for TB Transmission Co ntrol , Stop TB Partnershi p, Geneva, Switzerland.
www.stoptb.org/wg/ett/resources.

2. Nardel l EA, Bucher SJ, B rickner PW, Wa ng C, Vincen t RL, Becan -McBride K, Jam es MA, Michael M,
Wright JD. Safety of upp er-room ultraviolet germicidal air d isinfection for room occup ants: result s
from the Tuberculosis Ul traviolet S helter Study. Public Health Rep. 20 08;123:52–60 w.

4 Fail-Safe

Step 02: Eye Level Safety measurements

Instructions for
Measuring

1. Create a grid of measurements on the floor,
placing the tripod at an equally-spaced distance
(see table to the right).

2. Place the tripod head at the default 6ft (1.83m) or
acceptable eye level for the tasks that take place in
the space.

3. Make sure to use the 80° field of view adapter on the
detector for these measurements.

4. At each grid point, take five measurements.

• For the first measurement, orient the detector

(normal of the detector surface) horizontally
(pointed at ceiling).

• Next, orient the detector vertically, pointing

straight ahead along the typical line of sight

formeasurements in all directions.

5. Record the location of all measured points, clearly
highlight if any measurement is higher than the
maximum agreed upon value for the application
(based on the Maximum Permissible UV-C Exposure
guidelines in Appendix A).

to be taken andsystem should not be energized until

measurements are in alignment with Appendix A
dosage recommendations.

1

Corrective action needs

Measurement Grid

Space

Length

(ft /m)

<6ft/<1.83m 1.5ft/0.5m 4

6 - 2 4 f t/ 2-7. 5 m 3f t/1m 5

24 - 65 f t/ 7.5 - 2 0m 4.5ft/1.5m 10

>65ft/>20m 6ft/1.83m 15

• The larger the area, the bigger the
distance between measurement points.

• Grid should not align with luminaire layout.

• If a simulated calculation of the space has
been provided, the measurement grid may
follow the simulated grid points for correlation.

• Reduce grid distance:

- Where multiple luminaire are combining energy 

- Wherever highly reflective surfaces might be found 

- At task areas

Maximum

grid spacing

(ft /m)

Minimum

grid points

2

Sensor Orientation

Horizontal

3

1. See A ppendix A.

2. End TB Transmissio n (ETTI) (2019) Maintenance of Upper-Roo m Germicidal Ultraviolet (GUV) Air
Disinfectio n Systems for T B Transmis sion Control, Stop TB Par tnership, G eneva, Switzerland.

www.stoptb.org/wg/ett/resources.

3. See App endix B.

Vertical

Germicidal U V Upper Air 5

Step 02: Eye Level Safety measurements

Figure 2

Figure 3

Figure 2: Technician checking eye level safety with GUV radiometer. Searching for

the hot- spots at eye level using a hand-held radiometer and sensor with 80 degree
field -of-view cover to mimic the structure of the brow and eye.

Figure 3: A tape measure is recommended to set the tripod to 6f t (1.83m).

Figure 4: A tripod is recommended for easy repetitive measurements at 6ft (1.83m)

along the grid.

Figure 5: Measuring along the line of eye sight of the occupant.

Figure 4

6 Fail-Safe

Figure 5

Step 03: Documentation and Deliverables

1. Mechanical / Electrical Installation report
(reporting if the luminaires were correctly installed,
following mounting instructions and design guidance).

2. Visual / photographic inspection
(confirming if all elements noted during the audit are still valid).

3. Irradiance measurements should be recorded and saved (recorded in
XLS, PPT or Word – not scanned handwritten values).).

4. Baseline Measurements – in the beam (Step 01).

5. Eye Level Safety and compliance - Out of the beam (Step 02)
at 6ft (1.83m) or the height used in the design.

6. All documentation should be made available to all parties involved
(installing/commissioning contractor, distributor, owner)
and saved in a secure location for future reference.

Germicidal U V Upper Air 7

AA

Final Notes and Appendices

Dosing Recommendation

Maximum permissible UVC exposure

This international standard adopts the REL1 maximum
permissible UVC exposure values and the maximum
permissible UVC exposure shall not exceed the ACGIH

TLHand NIOSH REL
40hour work week exposure to UV radiation at 254 nm.

1

of 6.0 mJ/cm2 for an 8 hour day,

2, 3

Maximum permissible UVC
exposure for radiation at 254 nm

Permissible UVC

exposure time

24 hours 0.07

18 hours 0.09

12 hours 0.14

10 hours 0.17

8 hours 0.2

4 hours 0.4

2 hours 0.8

1 hour 1.8

30 minutes 3.3

15 minutes 6.7

10 minutes 10

5 minutes 20

1 minutes 100

30 seconds 200

15 seconds 400

5 seconds 1200

1 second 6000

Threshold Limit Value® (TLV®) consideration should be
based on real-time occupancy of spaces treated by UVGI.
This recommendation is supported by recent UV monitoring data
from First and Colleagues
poorly predict actual exposure of room occupants.

1. CDC/ NIOS H. Recommen ded Ex posur e Limit . REL, 2005

2. NIOSH . Criteria for a r ecommended stan dard: Occupational expos ure to ultravio let radiatio n
Publication 73-11009. National Institute for Oc cupational Safety and Health, Was hington, D.C, 1972

3. ACGIH. 2 007. TLVs® and BEIs®. Ame rican Conference of Govern mental Indu strial Hygie nists,
Cincinnati, OH

4. First M.W., Weker R. A., Yasui S., Nardell E .A. Monitoring human exp osures to upper-room
germicidal u ltraviolet i rradiation . J. Occup. Environ. Hyg. 2005, 2 pp. 28 5–292

Effective irradiance

2

µW/cm

<0.8 μW/cm3

operating
range for TLV
assessments

>0.8 μW/cm3

is not allowable
for design
acceptance
criteria and
commissioning

4

, who founded that peak meter readings

3

UVC radiation reectance

Material Refl. (%)

Aluminium:
untreated surface

Aluminium:
treated surface

Aluminium:
sputtered on glass

“ALZAK”
treated aluminium

“DURALUMIN” 16

Stainless steel

/Tin plate

Chromium plating 39

Various white
oil paints

Various white
water paints

Aluminium paint 40-75

Zinc oxide paint 4-5

Black enamel 5

White baked
enamel

White plastering 40-60

Magnesium oxide 55-60

Calcuim carbonate 75-88

Linen 70-80

Bleached wool 17

Bleached cotton 4

Wallpapers: Ivory 30

Wallpapers: white 31

Wallpapers: white 21-31

Wallpapers:
red printed

Wallpapers:
ivory printed

Wallpapers:
brown printed

White notepaper 25

Reed NG, Wengraitis S , Ultraviol et Spectral

Reectanc e of Ceiling Tiles, and Implications for

the Safe U se of Upper- Room Ultraviolet G ermicidal
Irradiation Photochemistry & Photobiology 2012, 88:
1480-14 88

40-60

60-89

75-85

65 -75

25-30

3-10

10-35

5-10

31

26

18

Ceiling tiles reectance values

Incl

ID

specular

A 0.035±0.001 0.034

B 0.043±0.002 0.041

C 0.048±0.001 0.047

D 0.051±0.001 0.05

E 0.052±0.002 0.047

F 0.055±0.006 0.054

G 0.060±0.002 0.059

H 0.064±0.004 0.062

I 0.070±0.001 0.065

J 0.071±0.005 0.071

K 0.071±0.001 0.069

L 0.074±0.001 0.071

M 0.076±0.003 0.067

N 0.096±0.003 0.041

O 0.106±0.006 0.047

P 0.107±0.024 0.05

Q 0.122±0.007 0.047

R 0.151±0.008 0.054

S 0.152±0.009 0.059

T 0.165±0.021 0.062

U 0.237±0.011 0.065

V 0.240±0.033 0.071

W 0.240±0.063 0.069

X 0.244±0.023 0.071

Y 0.245±0.070 0.067

Z 0.260±0.048 0.288

AA 0.260±0.035 0.243

BB 0.273±0.007 0.274

CC 0.275±0.016 0.28

DD 0.276±0.013 0.283

EE 0.276±0.026 0.29

FF 0.282±0.029 0.306

GG 0.334±0.024 0.333

HH 0.353±0.031 0.363

II 0.362±0.028 0.364

JJ 0.423±0.103 0.41

KK 0.459±0.015 0.438

Excl
specular

8 Fail-Safe

AA

Final Notes and Appendices

Ceiling tile information

Manufacturer Item Name Item No. Materials Notable surface features ID

Armstrong Armatuff 860 Wet-formed high-density mineral ber Latex paint R

Armstrong Ceramagurad 605 Ceramic and mineral ber composite Scrubbable plastic nish KK

Armstrong Cirrus 574 Wet-formed mineral ber Latex paint HH

Armstrong Cirrus (camel) 589 Wet-formed mineral ber Latex paint S

Armstrong Cirrus (platinum) 589 Wet-formed mineral ber Latex paint X

Armstrong Clean Room Mylar 1721 Wet-formed mineral ber Soil-resistant polyester lm G

Armstrong Clean Room VL 870 Wet-formed mineral ber Vinyl-faced membrane K

Armstrong Cortega 769 Wet-formed mineral ber Latex paint V

Armstrong Crossgate 2625 Wet-formed mineral ber Latex paint AA

Armstrong Dune 1772 Wet-formed mineral ber Latex paint U

Armstrong Endura 639 Wet-formed high-density mineral ber Vinyl latex paint GG

Armstrong Fine Fissured School Zone 1714 Wet-formed mineral ber Latex paint FF

Armstrong Fine Fissured (camel) 1729 Wet-formed mineral ber Latex paint T

Armstrong Fine Fissured (haze) 1729 Wet-formed mineral ber Latex paint DD

Armstrong Fine Fissured (techblack) 1729 Wet-formed mineral ber Latex paint D

Armstrong Fine Fissured (white) 1729 Wet-formed mineral ber Latex paint Z

Armstrong Fine Fissured Open Plan 1754 Wet-formed mineral ber Latex paint II

Armstrong Georgian 17 Wet-formed mineral ber Latex paint CC

Armstrong Graphis 1753 Wet-formed mineral ber Latex paint J

Armstrong Latitudes 8005 Wet-formed mineral ber Latex paint W

Armstrong Ledges 8011 Wet-formed mineral ber Latex paint P

Armstrong Mesa 680 Wet-formed mineral ber Latex paint E

Armstrong Optima 3151

Armstrong Painted Nubby 3101 Fiberglass Latex paint EE

Armstrong Pebble 2989 Fiberglass Latex paint N

Armstrong Random Fissured 2910 Fiberglass Scrubbable vinyl lm facing F

Armstrong Sansera 573 Embossed wet-formed mineral ber Latex paint Y

Armstrong Shasta 2906 Fiberglass Scrubbable vinyl lm facing H

Armstrong Stratus 531 Wet-formed mineral ber Latex paint JJ

Armstrong VL 871 Wet-formed mineral ber Vinyl-faced membrane L

Certain-Teed Ecophon Gedina E — Fiberglass Sound-resistant coating BB

Certain-Teed Fine Fissured High NRC 454 Wet-felted mineral ber Latex paint M

Certain-Teed Symphony F 134,2,4 Fiberglass Laminate C

Certain-Teed Theatre Black F 1910,2 Fiberglass Laminate A

Certain-Teed Vinyl Rock 1140,2- C R F -1 Gypsum Scrubbable vinyl lm facing I

USG Astro Climaplus — Mineral ber — Q

USG Brio Climaplus — Mineral ber — Q

Fiberglass with acoustically
transparent membrane

Acoustically transparent
membrane and latex paint

B

Note: Al l tiles are white unless noted in parentheses next to the model, or in the mo del name itself; ID used to identify specic tiles in Figures, Tables, and tex t.

Germicidal U V Upper Air 9

Cooper Lighting Solutions

1121 Highway 74 South
Peachtree City, GA 30269
P: 770-486-4800
www.cooperlighting.com

Canada Sales

5925 McLaughlin Road

Mississauga, Ontario L5R 1B8

P: 905-501-3000
F: 905-501-3172

© 2020 Cooper Lighting Solutions
All Rights Reserved
Publication No. IB519137EN
January 28, 2021 7:54 AM

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