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USER MANUAL
MODEL 6D ULTRAVIOLET SAFETY METER
Compliant
INTRODUCTION
The model 6D Ultraviolet Safety Meter is sensitive
to most of the ultraviolet region and gives an accurate
measurement of hazardous radiation to which an
industrial worker may be subject to.
The meter indicates how long a worker may remain
at the measured position before reaching the threshold
limit value (TLV) specified as hazardous in the 19941995 standards published by the American
Conference of Governmental Industrial Hygienists
(ACGIH). The proposal states that total UV exposure in
an 8 hour working period, TLV, should not exceed 3
millijoules per centimeter squared at 270 nm. Other
wavelengths have their Threshold Limit Values set by
the Relative Spectral Weighting Function marked SWF.
Personnel working with or in the vicinity of sources
producing ultraviolet radiation should not be exposed
to levels exceeding the exposure limits. The Spectral
Sensitivity of the meter is shown in Fig. 1.
The ultraviolet exposure limits do not apply to
photosensitive individuals or to individuals
concomitantly exposed to photosensitizing agents.
These values should be used as guides in the control
of exposure to continuous sources where the exposure
duration is not less than 0.1ms. These values should
be used as guides in the control of exposure and
should not be regarded as a fine line between safe
and dangerous levels.
CALIBRATION
The effective irradiance exposure for the unprotected
eye or skin should not exceed the values found in
Threshold Limit Values and Biological Exposure Indices
within an 8 hour period. To determine the effective
ultraviolet irradiance, Es of a broad band source, the
following weighting formula should be used:
where Eλ is the spectral irradiance in W/(cm2 nm), S(λ)
is the relative spectral effectiveness found in Threshold
Limit Values and Biological Exposure Indices, and Δλ
is the bandwidth in nm. The summation extends from
200 to 400nm. The permissible exposure time t(max)
in seconds, for exposure to ultraviolet radiation incident
upon the unprotected eye or skin may be computed by:
where Es is in W/cm2. While it is generally accepted that
the eye is the part of the body most vulnerable to UV
exposure, the ACGIH criteria apply to unprotected
human skin as well.
For better understanding of the TLVs, it is essential that
the ACGIH publication of be consulted.
( )
E E S
S
= × ×
å
l
l l
200
400
D
( )
t
J cm
E
S
max.=
×
-
0 003
2
Part Number: 210049 • Revision Level: A • Specifications subject to change without notice
UV Safety Meter Model 6D
Measures UV Radiation and Gives a
Safe Exposure Time Based on ACGIH Recommendations
USING THE METER
The meter displays the time (in hours and 1/100 parts
of an hour) after which the TLV is reached.
Since the spectral response of the meter differs from
the published Relative Spectral Weighting Function, the
reading of the meter may have an error factor depending
on the spectral output of the measured light source. The
correction factor was calculated for some typical
sources. Correction factors for other sources can be
calculated upon request. Caution should be taken when
measuring sources generating mostly UV wavelengths
shorter than 250nm since the reading of the meter can
be substantially lower than actual hazard.
TO MEASURE A SOURCE
•
Turn the power ON by sliding the ON/OFF switch on
the side of the case.
•
Hold the meter steady pointing the sensor towards
the potential source of UV hazard.
•
If the readings vary, take 3 consecutive readings
and average.
•
Multiply the reading by the correction factor that
is source dependent. The result is in hours and
1/100 of an hour.
The smallest possible reading is 0.02-0.03 hours (90
and 108 seconds respectively). This means extremely
hazardous UV radiation that will deliver TLV in less than
108 seconds
.
The maximum reading is 10.00 hours that means no UV
hazard exists. When the UV light is weak (the meter
reads 6 hours or more) the reading tends to vary,
especially when hand held. Using a steady support or
averaging consecutive readings will give meaningful
result.
If the LOBAT sign on the display is ON the battery
should be changed. Use standard 9V battery for
replacement. An average battery life should be over
100 hours of continuous operation.
TECHNICAL SPECIFICATIONS
REFERENCES
Threshold Limit Values and Biological Exposure Indices (Pub. No.
0206) ACGIH, 6500 Glenway Ave., Cincinnati, OH 45211-4438,
tel. 513-661-7881
LIGHT SOURCE CORRECTION
FACTOR
Quartz Halogen Lamp (150W)
1.0
Xenon Arc Lamps (150W)
0.85
Direct Sunlight
(30˚ SZA, 2.7mm Ozone Column)
4.81
Mercury Discharge Lamp
0.65
Metal Halide Lamp
0.66
Fig. 1. Linear Spectral Response
Fig. 2. Log Spectral Response
SPECIFICATIONS
Spectral Response
See Figure 1
Detector Viewing Angle
±30˚
Battery
9V
Power Consumption
<3mA
Operating Environment
0.40˚C
- No Humidity Condensation
Weight
7 oz. (200g)
Dimensions
6”L x 3.2”W x 1.5”H
(15 x 8 x 3 cm)
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