Bronkhorst Mini CORI-FLOW - Manual (Page 33)

BRONKHORST CORI-TECH B.V.
4.6 Calibration procedure
All instruments are factory calibrated on all possible ranges, independent of customer conditions.
Calibration will be performed with water under normal temperature and atmospheric conditions (20°C and 1
bara). After calibration the instruments will be dried thoroughly.
Instruments will be calibrated using water on 6 points over the full flow range where the instrument can be used
for. Because Coriolis instruments measure mass flow, they will have the same accuracy for all fluids and
therefore calibrations on actual fluids will not be necessary.
Also density will be calibrated and calibration checks on air will be performed.
For the flow calibration, the instrument will be set to the maximum full scale value and seven points (including
zero) will be compared with a reference. All points will be shown in a graph to illustrate that they are within
limits of total accuracy (±0.2% ±Zero Stability).
After this calibration, the actual capacity (full scale) value will be set to the wanted flow value ordered by the
enduser. This value can be easily changed on site by the enduser using Bronkhorst tooling software (FlowDDE
and FlowPlot) which can be downloaded from the website: http://downloads.bronkhorst.com/ .
Thus re-ranging the instrument will be possible between a minimum and a maximum capacity. Over this
complete range the instrument calibration certificate will be valid.
Analog outputs (A: 0…5Vdc /B: 0…10Vdc /F: 0…20mA /G: 4…20mA) for flow and analog inputs for giving
setpoints to controllers, will be adjusted as ordered. These adjustments include an extra uncertainty of < ±0.1%
at each input as well as at each output.
The analog output and -input maximum values are equal to the actual capacity (full scale) value of the
instrument and will be linear to the flow.
If the instrument will be re-ranged: actual capacity will be set to another value, this analog value will get another
meaning.
The original, factory set, actual capacity (full scale) value and type of analog signal will be displayed on the grey
sticker on the instrument. This will be the value what the instrument had been ordered for.
Example:
M13 instrument has a maximum flow of max. 2000 g/h.
It will be calibrated up to 2000 g/h on 7 points, including zero.
Enduser wants to use it with 4…20 mA and orders the instrument for 150 g/h.
When the instrument leaves the factory 20mA will correspond with 150 g/h.
After re-ranging it to a full scale of 500 g/h, 20mA will correspond with 500 g/h Mix.
After re-ranging it to a full scale of 2000 g/h, 20mA wil correspond with 2000 g/h.
Note:
The fluidname “Mix” is just indicative for actual use. However, the meter will measure all fluids with same
accuracy as long as the instrument is capable of handling the fluid (pressure drop, corrosion resistance,
suitability of valve or pump etc.).
G: 4…20mA analog input and output
Capacity (FS) = 150 g/h Mix
9.17.050 page 33