OIML R49 (Water Meters) Certificate Schema. The certificate structure lists the top-level fields of the document model. The definitions expand the family's own vocabulary. Where the corpus carries fill statistics, the observed fields table shows how often each characteristic actually appears.
Certificate structure
Every R49 certificate is one object with these top-level fields. A "core" shape is shared across all Recommendation families; the rest are defined by this family's own definitions below.
Field
Shape
Required
certificate
core · Certificate
yes
issuing_authority
core · IssuingAuthority
no
applicants
core · PartyList
no
manufacturers
core · PartyList
no
certified_type
CertifiedType
yes
characteristics
Characteristics
yes
recommendation
object
yes
test_reports
core · TestReportList
no
revision_history
core · RevisionHistory
no
model_family
core · ModelFamily
no
components
array of core · Component
no
footnotes
core · FootnoteList
no
matrix_tables
MatrixTableList
no
d011_tests_applicable
array of D011TestReference
no
Observed fields
From 4 digitalized R49 certificates: how often each type-level characteristic appears (fill rate), in how many certificates, and the most common values observed.
Field
Fill rate
Present in
Common values
accuracy_class
100%
4
2
measuring_principle
100%
4
multi jet
temperature_class
100%
4
T30
water_pressure_class
100%
4
MAP16
pressure_loss_class
100%
4
ΔP63
maximum_admissible_temperature
100%
4
maximum_admissible_pressure
100%
4
orientation_limitation
100%
4
Horizontal with the dial at the top
indicating_range
100%
4
flow_profile_sensitivity_class
100%
4
U0D0
flow_conditioner
100%
4
No
mounting
100%
4
in-line
orientation
100%
4
horizontal
reverse_flow
100%
4
Not designed to measure
mechanical_environment_class
100%
4
B/M1
data_output_options
100%
4
10/100/1000
q2_over_q1
100%
4
1.6
q4_over_q3
100%
4
1.25
resolution_of_the_indicating_device
75%
3
0.1
category
50%
2
Positive displacement meters and turbine meters
case
50%
2
A
minimum_straight_length_of_inlet_pipe
50%
2
0
minimum_straight_length_of_outlet_pipe
50%
2
0
resolution_of_indicating_device
25%
1
0.1
minimum_straight_length_inlet_pipe
25%
1
0
minimum_straight_length_outlet_pipe
25%
1
0
q3_over_q1
25%
1
min=None, max=160
Definitions
The shapes named by the certificate structure above, expanded to their fields.
