Ultra Class U calibration weight set, (1-100g 9 piece WTSET9PCU), ASTM Shape,
includes Report of Traceability. No Certificate of Calibration is included
with this weight set so this is no Uncertainty Value with the documentation.
Typical lead time is 7 to 10 business days from the date order is placed to shipping
from NVLAP metrology lab located Arvada, Colorado.
These Ultra Class U Mass Standards provide the greatest precision we offer.
They are ideal for use as reference standards to calibrate other weights or for
calibrating high-resolution analytical balances. Ultra Class U weights are
identical to E2 weights except for the nominal value markings. E2 weights
have no markings on the weights, many customers prefer the weights be marked with
the nominal value. The OIML E2 tolerance is approximately two times the
precision of ANSI/ASTM Class 1.
Single-piece construction: Because the precise measurement of density can
only be achieved using a single piece weight, all Sartorius weights are ASTM Type
1 single-piece weights. These weights contain no air cavity or foreign adjusting
material, thus providing the maximum mass stability. In addition, it is
an ASTM requirement that one-piece weights are used as standards and where mass
stability is required.
The mass standards produced by Sartorius today are designed to meet or exceed
the standards of the American Society of Testing Materials (ASTM E617)
Weights
Included: 1g, 2 x 2g, 5g, 10g, 2 x 20g, 50g, 100g
Custom
weight sets are available upon request by calling
Precision Weighing Balances at 978-521-7095
All
calibration weights are not returnable. Once your order
has been placed it CAN NOT be cancelled. Please carefully
consider this prior to placing your order. The reason for
this is these weights are custom manufactured and are certified
on the date they were made. In addition, if you touch the
calibration weight with your fingers the oil in your skin would
change the tolerance and we can not take this chance if the weight
was returned.
Report of Traceability.
Each Sartorius Ultra Class U, Class 1, Class 2 weight or weight
set is supplied with a report of traceability at no additional cost.
This report identifies:
Tolerance class
Type of construction
NIST test number
Date of applicable Sartorius primary standard(s)
Secondary set number
Includes technician's signature
Recertification Service Weight values can change over time due to scratches, fingerprints, wear
and even corrosion resulting from atmospheric contaminants. Regular
checks on the accuracy of mass standards ensures the accuracy of measurements.
The Sartorius mass metrology lab provides this service at a very competitive
price.
The current rates are listed below and subject to change. Typical
turn around time (excludes transit time) is 7-10 business days upon
receipt at the Arvada, Colorado metrology lab. You are responsible for
both in and out bound freight and insurance costs.
Single weights - $65
Two or more weights - $48 each
Weight sets of 15 or more weights - $37 each
Please call us at 978-521-7095 if you presently have calibrations
weights that require recertification.
What does calibration of a laboratory weight entail?
Sartorius
mass comparators compare a weight to a known mass (a NIST calibrated
reference weight) and report the difference, to a very small value.
These mass comparators can ascertain and measure differences to
10, 1, and even 0.1 micrograms (one ten-millionth of a gram), multiple
weighings, averaged, can resolve the differences to even smaller
amounts.
Calibration technicians must wear appropriate static free clothing,
as well as gloves, hair nets and face masks, to reduce the possibility
of contamination (and changing the weight of the weights) from skin
oils, hairs, or airborne droplets. Calibration weights are
never touched directly by human hands.
What is the difference in tolerance between Sartorius Ultra Class
U, Class 1, Class 2 and other calibration specifications?
Metric
Weight Tolerances - all tolerances stated in milligram (mg)
American
Society of Testing & Measurement ASTM E617
Denomi-
nation
Metric
Sartorius
Ultra
Class U
Class
1
mg
Class
2
mg
Class
3
mg
Class
4
mg
Class
5
mg
Class
6
mg
Class
7
mg
5
kg
6.00
12
25
50
100
250
500
1400
3
kg
3.80
7.5
15
30
60
150
300
1000
2
kg
2.50
5.0
10
20
40
100
200
750
1
kg
1.25
2.5
5.0
10
20
50
100
470
500
g
0.600
1.2
2.5
5.0
10
30
50
300
300
g
0.380
0.75
1.5
3.0
6.0
20
30
210
200
g
0.250
0.50
1.0
2.0
4.0
15
20
160
100
g
0.125
0.25
0.50
1.0
2.0
9
10
100
50
g
0.060
0.12
0.25
0.60
1.2
5.6
7
30
g
0.037
0.074
0.15
0.45
0.90
4.0
5
44
20
g
0.037
0.074
0.10
0.35
0.70
3.0
3
33
10
g
0025
0.050
0.074
0.25
0.50
2.0
2
21
5
g
0.017
0.034
0.054
0.18
0.36
1.3
2
13
3g
0.017
0.034
0.054
0.15
0.30
0.95
2
9.4
2
g
0.017
0.034
0.054
0.13
0.26
0.75
2
7.0
1
g
0.017
0.034
0.054
0.10
0.20
0.50
2
4.5
500
mg
0.005
0.010
0.025
0.080
0.16
0.38
1
3.0
200
mg
0.005
0.010
0.025
0.060
0.12
0.26
1
1.8
100
mg
0.005
0.010
0.025
0.050
0.10
0.20
1
1.2
50
mg
0.005
0.010
0.014
0.042
0.085
0.16
0.5
0.88
20
mg
0.005
0.010
0.014
0.035
0.070
0.12
0.5
0.56
10
mg
0.005
0.010
0.014
0.030
0.060
0.10
0.5
0.4
5
mg
0.005
0.010
0.014
0.028
0.055
0.080
0.2
2
mg
0.005
0.010
0.014
0.025
0.050
0.060
0.2
1
mg
0.005
0.010
0.014
0.025
0.050
0.050
0.1
The
table above is a listing of the tolerances of various classes of
masses. The weight value can deviate above or below the nominal
value by the tolerance defined. To determine the tolerance
of a mass, look at the denomination or nominal value of the weight
and the appropriate class you need.
Custom
weight sets are available upon request by calling
Precision Weighing Balances at 978-521-7095
All
calibration weights are not returnable. Once your order
has been placed it CAN NOT be cancelled. Please carefully
consider this prior to placing your order. The reason for
this is these weights are custom manufactured and are certified
on the date they were made. In addition, if you touch the
calibration weight with your fingers the oil in your skin would
change the tolerance and we can not take this chance if the weight
was returned.
Analytical Balances
money order
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