Siemens SITRANS F M TRANSMAG 2, Руководство по эксплуатации, Страница: 47 / 114

Functions
7.4 Function Group Measuring Functions
SITRANS F M TRANSMAG 2
Operating Instructions, 11/2009, A5E00102775-07
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● Density, menu item 3.1.4
You must specify unit and density here. The volume flow qv is converted to mass flow qm
automatically using the formula (qm = qv * r).
● Direction, menu item 3.1.5.
This item is divided into:
– Flow direction, menu item 3.1.5.1
– Measuring direction, Menu item 3.1.5.2
– Hysteresis, Menu item 3.1.5.3
1. The flow direction (3.1.5.1) is preset at the factory and indicated by the arrow on the
sensor. If the flow direction does not match the direction of the arrow it must be adapted
in this menu item.
Figure 7-2 Setting Forw. and Rev. (left) and setting Forw. only (right)
2. With measuring direction (3.1.5.2) it is possible to detect flow in forward and backward
direction and to pass on the appropriate signal proportionally to the analog or digital
output. In "forwards" parameterization, only signals in this direction are output or
accumulated internally.
Example 1: Hysteresis = 0%
0
b
a
Example 2: Hysteresis = 0%