Endress+Hauser Proline Promass 83 - Page 116

9 Block BASIC FUNCTION Device Functions Proline Promass 83 MODBUS RS485
116 Endress+Hauser
DENSITY
SETPOINT
2
MODBUS register:
Data type:
Access:
6485
5181
Float
read/write
Use this function to enter the density setpoint value for the second fluid for which
you want to carry out field density adjustment.
User input: 5-digit floating-point number, including units
! Note!
• The preset density entered here should not vary from the actual fluid density by
a more than ±10%.
• The difference between the density setpoint values must be at least 0.2 kg/l.
• The appropriate unit is taken from the function group SYSTEM UNITS
(see Page 15).
MEASURE FLUID 2
MODBUS register:
Data type:
Access:
6486
5183
Integer
read/write
In this function the current density of the second fluid is measured for density
adjustment.
Options:
0 = CANCEL
1 = START
DENSITY
ADJUSTMENT
MODBUS register:
Data type:
Access:
6487
5127
Integer
read/write
With this function a density adjustment can be carried out on site.
The density adjustment values will thus be recalculated and stored. This ensures
that the values dependent on density calculations (e.g. volume flow) are as
accurate as possible.
! Note!
Before carrying this out, please refer to the Operating Instructions BA107D for a
detailed description of the procedure for density adjustment.
Two types of adjustment are possible:
1-point density adjustment (with one fluid)
This type of density adjustment is necessary under the following conditions:
• The sensor does not accurately measure the density which the operator expects
based on laboratory trials.
• The characteristics of the fluid are outside the measuring points set at the
factory or reference conditions under which the flowmeter has been calibrated.
• The plant is used solely for measuring a fluid whose density is to be determined
very accurately under constant conditions.
2-point density adjustment (with two fluids)
This type of adjustment must always be carried out when the measuring tubes are
changed mechanically, e.g. due to deposits, abrasion or corrosion:
In such instances, the measuring tube resonance frequency is influenced in such a
way that it is no longer compatible with the calibration data determined at the
factory.
The 2-point density adjustment takes these mechanically-based changes into
account and calculates new, adjusted calibration data.
Options:
0 = CANCEL
1 = MEASURE FLUID 1
2 = MEASURE FLUID 2
3 = DENSITY ADJUST
Factory setting: CANCEL
RESTORE
ORIGINAL
MODBUS register:
Data type:
Access:
6488
5128
Integer
read/write
With this function the original density coefficient determined at the factory are
restored.
Options:
0 = NO
1 = YES
Factory setting: NO
Function description
BASIC FUNCTION → PROCESS PARAMETER → ADJUSTMENT