Technical Note
00840-0300-4004, Rev AA
June 2010
7
Rosemount 8800D
Step 5:Set temperature sensor calibrator or
precision liquid bath to a set point of 100 °C
(212 °F)
A. IF Process Temperature value in the
electronicsmatchesthe referencetemperature
sensor within 2 °C (4 °F), then the
thermocouple is healthy and within
specifications.
B. IF Process Temperature value in the
electronicsmatchesthe referencetemperature
sensor within 2 °C (4 °F), then repeat with a
new electronics and thermocouple to verify the
calibration source.
B.1. IF the new set of electronics and
thermocouple works, then contact your
local Rosemount representative for
assistance with returning the unit to the
factory.
B.2. IF the new set also fails, then verify the
calibration source.
HART Command: 1 (Device Setup), 1 (Process
Variables), 4 (View Other Variables), 9 (Process
Temperature)
Procedure V: Perform Density Test Calculation
(For Use Case II Only)
For Use Case II – copy from above, the electronics
verification was performed using a fixed process
density. When the device is in Tcomp Sat Steam
mode, the process density is dynamically calculated
from the measured process temperature. This
procedure will verify that the electronics can
calculate the corresponding density of saturated
steam for given process temperatures.
Step 1:Verify Process Fluid is set to Tcomp
Sat Steam
HART Commands: 1 (Device Setup), 3 (Basic
Setup), 2 (Process Config), 2 (Process Fluid)
Please note you MUST SEND the data whenever
changes are made.
Step 2:Enter Density Test Calculation
HART Commands: 1 (Device Setup), 2 (Diagnostics
and Service), 1 (Test/Status), 3 (Density Test Calc)
Step 3:Enter a process temperature of interest
between 80-320 °C (176-608 °F)
Step 4:Compare calculated density to ASME
Saturated Steam Table found in APPENDIX C
Procedure VI: Meter Body/Shedder Bar
Verfication (Required)
NOTE:
Shedder Bar inspection is not required in the vast
majority of applications. It is very unusual that a
vortex flowmeter will require re-calibration for
shedder bar wear in normal applications. (Vortex
meters count the frequency of shedding which is
proportional to the fluid velocity – and is not highly
sensitive to edge sharpness). Exceptions to this are
highly corrosive applications, or applications with
high levels of suspended solids. Wear in these types
of applications may be significant enough to cause a
shift in the meters K-factor, and require re-calibration.
This is an unusual circumstance.
If shedder bar wear is suspected, the following steps
can be followed to determine if it is significant
enough to warrant re-calibration.
Step 1: Remove meter from process line.
Step 2: Inspect Shedder Bar leading edge for
sharpness.
A.Visual Inspection
This requirement may be considered satisfied
by visual inspection if the edge does not seem
to reflect a beam of light when viewed with an
unaided eye.
Procedure VII: Wet Calibration (If Required)
If the criteria of Procedures I through VI cannot be
met or completed successfully the meter body should
be re-calibrated by a certified Flow Test lab. If
convenient, the meter can be sent back to the
Rosemount Factory in Eden Prairie, MN, USA or a
local Rosemount Service center that supports vortex
calibration. If this is impracticable due to location, all
developed industrial nations will have National
Technical Standard-certified Flow Labs which may
perform this service.
