Certified Calibration Weights from Sartorius
- 1 mg to 5 kg weights. Sold individually
or as a 9-piece or 21-piece set.
- All weights meet or exceed ASTM specifications
- All mass measurements are made using procedures developed by
NIST
- All mass standards are milled from the finest corrosion-resistant
stainless steel stock ensuring consistent density
- Each weight is calibrated by a NVLAP-accredited metrology lab
in a climate-controlled environment
- One-piece construction provides the maximum mass stability
- Each weight and weight set is supplied complete with a Certificate
of Traceability
- Certificate of Calibration is available
at a nominal cost
- Each weight is calibrated by a NVLAP
Lab Code:200106-0 - accredited metrology laboratory located at
6542 Fig Street, Arvada, CO 80004 - 1-800-438-5068
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.
A Choice of Preconfigured or Custom Weight Sets: Whether
you choose a preconfigured weight set, or have a custom set made
to meet your specific needs, be assured that all Sartorius weights
are made of the highest quality materials. Weight sets consist
of flat weights in the 1mg to 500mg range and knob-style weights.
The mass standards produced
by Sartorius today are designed to meet or exceed the standards
of the American Society of Testing Materials (ASTM E617)
Which Class Calibration Weight is Right
for My Application?
A balance should be calibrated using a weight with a class tolerance
factor greater than the readability of the balance. Example:
A milligram balance with readability of 0.001g (i.e. Sartorius
GC2502 - 500g x 0.001g ) may be calibrated with a weight having
a known tolerance of at least 0.0009g.
OIML E2 and Ulti Mass Class U Mass Standards. These 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. Ulti
Mass 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.
ANSI/ASTM Class 1 can be used as reference standard in calibrating
other weights and appropriate for calibrating high-precision analytical
balances (from 0.01mg to 0.1mg).
ANSI/ASTM Class 2 Appropriate for calibrating high-precision
toploading balances with readabilities ranging from 0.001g to 0.01g.
ANSI/ASTM Class 3 Appropriate for calibrating balances with
moderate precision, ranging from 0.01g to 0.1g.
ANSI/ASTM Class 4 Appropriate for student use and semi-analytical
weighing.
NIST Class F Used to test commercial weighing devices by state
and local weights and measures officials, device installers and
service technicians. Class F weights may be used to test most accuracy
class III scales, all scales of class III L or IIII, and scales
not marked with a class designation.
Are all weights marked? YES
Small Knob weights marked with nominal values (100g,50g,20g......)
OIML shape marked with the nominal values (5,2,1,500,200,100,20,10..........)
no gram designation
Do the calibration weights come with a specified due date for
recalibration? NO
ISO/IEC 17025 paragraph 5.10.4.4 States: " A calibration certificate
(or calibration label) shall not contain any recommendation on the
calibration interval except where this has been agreed with the
client.' Therefore, Sartorius does not provide a calibration
due date. Setting calibration interval is the responsibility
of the end user. The certificate includes guidance information
in the proper recertify cycle depending upon the use of the calibration
weights.
Difference between Traceability and Cert of Calibration?
The major difference between the Report of Traceability and the
Calibration Certificate is the Report of Traceability is a tolerance
test and is only available for new weights. The Certificate
of Calibration is a full report of the parameters tested.
Below we outline what comes with each report.
Report of Traceability.
Each Sartorius Ulti Mass Class U, Class 1, Class 2 weight or weight
set is supplied with a report of traceability at no additional cost.
Other weight manufacturers charge a substantial amount extra for
this document - sometimes up to $90 more per weight. 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
- Description of the weight(s)
- Test Number
- Serial Number
- Nominal Value
- Uncertainty of the measurement tolerance
- Information on weighing procedures
- Date our primary standards were last tested at NIST and the
NIST test number
- Date and test number for our working standards.
- Statement of compliance to ANSI/NCSL Z540 and ANSI/ISO/IEC 17025
- NVLAP
Accreditation Logo and laboratory code.
- Statement of traceability to the International Prototype Kilogram
(IPK) this meets the international requirement for traceability
to the International System of Units.
Certificate of Calibration
Certificate of Calibration are available for any Ulti Mass Class
U, Class 1, or Class 2 weight or weight set. The "C" at the
end of the part number designates a Certificate of Calibration will
be included with your weight(s). The Certificate of Calibration
includes everything found in a Report of Traceability listed above
with the additional information listed below:
- Uncertainty value
- Test conditions temperature, barometric pressure, humidity.
- Conventional Mass Correction
- Uncertainty of the measurement
- Identification of the balance used in the calibration
- as found value if an adjustment is performed
- assumed density of the weight
- material weight is made from
- Pass/Fail result of magnetic testing
- Volume of the weight
- Cubical Coefficient of expansion
- True Mass correction
Who do you feel needs a Calibration Certificate verses Report
of Traceability?
If they are under ISO, FDA or other regulation they should
get a Calibration Certificate. Also, anyone that plans to
calculate uncertainty for their own process would need the certificate
of calibration so they could correctly include our uncertainty into
their own uncertainty budget.
If they have a balance or scale with the ability to read to a milligram
or better it is always recommend they know the corrected value of
the weight and this is only available with the Calibration Certificate.
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 to 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 Linda Smith at 303-431-7255 if you presently have calibrations
weights that require recertification.
What does calibration of a laboratory weight entail?
Unlike some metrology calibration labs Sartorius does not average
multiple weighing. Also, All calibrations are accredited calibrations.
Sartorius does not believe in playing the game of talking about
their accreditation and then offering low cost calibrations which
do not meet the requirements of our scope of accreditation.
Sartorius calibrates all weights using NIST weighing designs, where
all weights are compared against 2 standards. Sartorius
mass comparators ascertain and measure differences to 10, 1,
and even 0.1 micrograms (one ten-millionth of a gram). The
value of the unknown weight is computed using a least sum squares
technique by the NIST masscode software. The software performs
statistical checks on the balance performance and the computed values
of the second standard. If the balance performance or computed
value of the second standard are found to be unacceptable the software
requires that the measurement be repeated. It is only when
the process standard deviation and computed value of the check standard
are acceptable that metrologist is confident in the value for the
customer's weight. All measurements in metrology laboratory,
including tolerance testing, use this Echelon I weighing technique.
The weighing designs are the same ones developed and used by NIST.
All measurement results are traceable to the International Prototype
Kilogram (IPK) through a NIST calibration of our primary standards.
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 can I do if I question a calibration?
The Sartorius Metrology Engineer backs all calibrations with
the following guarantee that is hard to beat. "We stand
behind our product and if anyone questions our calibration result
we bring them back for additional testing at no charge to our customers.
I will make arrangements for testing at an outside laboratory in
cases where there is disagreement after additional testing."
Ask your present calibration company if they back their calibrations
like this and we think you'll make the switch to Sartorius
What is True Mass Correction?
Basically, the only people who use "True Mass" are calibration
laboratories and other people who apply air buoyancy corrections
to the measurements. Conventional mass is what a weight would
weigh at sea level at standard temperature and pressure. Since
most people use their weights in air and don't have the equipment
or desire to measure and calculate the air density they have no
need for the true mass values. NVLAP published NIST Handbook
150-2G requiring calibration certificates to reporting "true mass".
If someone needs true mass they typically will know how to calculate
it from the Conventional mass.
What is Uncertainty?
Uncertainty is more than just the repeatability of the balance
it is a summation of all things which contribute to the error in
the measurement process. Uncertainty is the root sum square
of balance deviation, repeatability on the check standard, variability
in the density of the standard, variability in the density of the
weight under test, variability of the temperature, variability of
the barometric pressure, variability of the humidity, operator skill
and the uncertainty of the standard used multiplied by two.
What is the difference in tolerance between Sartorius Ulti Mass,
Class 1, Class 2 and other calibration specifications?
| Metric
Weight Tolerances - all tolerances stated in milligram (mg) |
| |
American
Society of Testing & Measurement ASTM E617 |
|
International
Organization of Legal
Metrology Recommendation R111 |
Denomi-
nation
Metric |
Sartorius
Ulti-Mass
Class U |
Class
1
mg |
Class
2
mg |
Class
3
mg |
Class
4
mg |
Class
5
mg |
Class
6
mg |
Class
7
mg |
|
E1
mg |
E2
mg |
F1
mg |
F2
mg |
M1
mg |
M2
mg |
M3
mg |
| 5
kg |
6.00 |
12 |
25 |
50 |
100 |
250 |
500 |
1400 |
|
2.5 |
7.5 |
25 |
75 |
250 |
750 |
2500 |
| 3
kg |
3.80 |
7.5 |
15 |
30 |
60 |
150 |
300 |
1000 |
|
|
|
|
|
|
|
|
| 2
kg |
2.50 |
5.0 |
10 |
20 |
40 |
100 |
200 |
750 |
|
1.0 |
3.0 |
10 |
30 |
100 |
300 |
1000 |
| 1
kg |
1.25 |
2.5 |
5.0 |
10 |
20 |
50 |
100 |
470 |
|
0.5 |
1.5 |
5 |
15 |
50 |
150 |
500 |
| 500
g |
0.600 |
1.2 |
2.5 |
5.0 |
10 |
30 |
50 |
300 |
|
0.25 |
0.75 |
2.5 |
7.5 |
25 |
75 |
250 |
| 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 |
|
0.1 |
0.30 |
1.0 |
3.0 |
10 |
30 |
100 |
| 100
g |
0.125 |
0.25 |
0.50 |
1.0 |
2.0 |
9 |
10 |
100 |
|
0.05 |
0.15 |
0.5 |
1.5 |
5 |
15 |
50 |
| 50
g |
0.060 |
0.12 |
0.25 |
0.60 |
1.2 |
5.6 |
7 |
|
|
0.030 |
0.10 |
0.30 |
1.0 |
3.0 |
10 |
30 |
| 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 |
|
0.025 |
0.080 |
0.25 |
0.8 |
2.5 |
8 |
25 |
| 10
g |
0025 |
0.050 |
0.074 |
0.25 |
0.50 |
2.0 |
2 |
21 |
|
0.020 |
0.060 |
0.20 |
0.6 |
2 |
6 |
20 |
| 5
g |
0.017 |
0.034 |
0.054 |
0.18 |
0.36 |
1.3 |
2 |
13 |
|
0.015 |
0.050 |
0.15 |
0.5 |
1.5 |
5 |
15 |
| 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 |
|
0.012 |
0.040 |
0.12 |
0.4 |
1.2 |
4 |
12 |
| 1
g |
0.017 |
0.034 |
0.054 |
0.10 |
0.20 |
0.50 |
2 |
4.5 |
|
0.010 |
0.030 |
0.10 |
0.3 |
1.0 |
3 |
10 |
| 500
mg |
0.005 |
0.010 |
0.025 |
0.080 |
0.16 |
0.38 |
1 |
3.0 |
|
0.008 |
0.025 |
0.08 |
0.25 |
0.80 |
2.5 |
|
| 200
mg |
0.005 |
0.010 |
0.025 |
0.060 |
0.12 |
0.26 |
1 |
1.8 |
|
0.006 |
0.020 |
0.06 |
0.20 |
0.6 |
2 |
|
| 100
mg |
0.005 |
0.010 |
0.025 |
0.050 |
0.10 |
0.20 |
1 |
1.2 |
|
0.005 |
0.015 |
0.05 |
0.15 |
0.5 |
1.5 |
|
| 50
mg |
0.005 |
0.010 |
0.014 |
0.042 |
0.085 |
0.16 |
0.5 |
0.88 |
|
0.004 |
0.012 |
0.04 |
0.12 |
0.4 |
|
|
| 20
mg |
0.005 |
0.010 |
0.014 |
0.035 |
0.070 |
0.12 |
0.5 |
0.56 |
|
0.003 |
0.010 |
0.03 |
0.10 |
0.30 |
|
|
| 10
mg |
0.005 |
0.010 |
0.014 |
0.030 |
0.060 |
0.10 |
0.5 |
0.4 |
|
0.002 |
0.008 |
0.025 |
0.08 |
0.25 |
|
|
| 5
mg |
0.005 |
0.010 |
0.014 |
0.028 |
0.055 |
0.080 |
0.2 |
|
|
0.002 |
0.006 |
0.020 |
0.06 |
0.20 |
|
|
| 2
mg |
0.005 |
0.010 |
0.014 |
0.025 |
0.050 |
0.060 |
0.2 |
|
|
0.002 |
0.006 |
0.020 |
0.06 |
0.20 |
|
|
| 1
mg |
0.005 |
0.010 |
0.014 |
0.025 |
0.050 |
0.050 |
0.1 |
|
|
0.002 |
0.006 |
0.020 |
0.06 |
0.20 |
|
|
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. |
|
