Endress+Hauser Proservo NMS5 Operating Instruction page 76

8 Commissioning
76
Operation
Select the measurement of the density desired from UPPER DENSITY, MIDDLE DENSITY, or DENSITY
BOTTOM at GVH020 "OPERATION". NMS5 raises the displacer up out of the liquid, measures its
weight, and sends the displacer down to measure the density. After density is measured, the displacer
remains at that position until UP or LEVEL command are selected at GVH020.
Figure 67: Density measurement
8.6.2 Density profile measurement
Tank profile density measurement
In addition to the preconditions, the following additional preconditions are required in order to assure
safe and accurate operation for the density measurement of the tank profile.
Access Code 51 is required to edit parameters.
• NMS5 must be configured for Spot & Profile density measurement as ordered from Endress+Hauser.
Contact Endress+Hauser for the information regarding upgrading NMS5.
• The standard tank bottom level (GVH004) is zero. If not, the formula used for calculating the inter-
val between profiles is GVH000 / GVH841. The displacer touches the bottom of the tank before
measuring a lower level (e.g. 884mm).
• If Bottom Level is not 0 mm, select Manual I/F Profile at GVH840. Set GVH843 I/F Manual Level =
actual bottom level e.g. 884mm. In this case, the intervals will be calculated based on GVH000 -
GVH843/GVH841.
• The density profile can be operated when the liquid is still in the tank. However, depending on the
height of liquid level, it may take 1 hour or more to operate the density profile.
Matrix Item
GVH154 SAFE DENSITY
DEN. OPE.
GVH155
LEVEL
Additional matrix parameter settings are required for remote communications via WM550 communi-
cations protocol. Refer to Section "14 Matrix, (Dynamic Matrix, Device Data: G2), WM550 DENS. SEL.".
Upper layer (Gas or liquid)
A
B
Lower layer
(Liquid)
Select the desired resultant condition when density profile measurement
fails due to displacer reaching the low-limit for density profile operation
(set in GVH155). Selecting "ON" will result in STOP operation. Selecting
"IGNOR" will result in "LEVEL" operation, displacer will return to liquid level.
Selecting "OFF" will leave the displacer at the position where density profile
measurement failed, and in "DENSITY" operation.
Set the lower limit for displacer movement during density profile operation
Default setting = 300 mm.
Proservo NMS5
Setting
Endress+Hauser