Siemens SITRANS P500, Руководство по эксплуатации, Страница: 92 / 238

Operate
6.2 Parameter description
SITRANS P500 with HART
92
Operating Instructions, 12/2014, A5E02344528-09
Description: The parameter defines the characteristic of the output flow.
"linear" The output flow is proportional to the differential pressure.
"srlin" Up to the root application point, the output flow is proportional to
the differential pressure and thereafter it corresponds to the root
function.
"sroff" The output flow is 0 until the root application point, and thereafter it
corresponds to the root function.
A low flow cut-off.
"srlin2" The output flow is proportional to the flow, two-stage linear up to
the root application point. The first linear section ranges from the
zero point to 0.6% of the output value and 0.6% of the pressure
value. The second linear section runs with a higher gradient to the
root application point and then in accordance with the root function.
See also
Flow characteristic (Page 155)
"2.1.5.3 Squareroot Startingpoint"
Factory setting: 5 %
Setting range:
•
Min 1 %
• Max 15 %
Purpose: Setting the root application point
Description: The parameter defines as of when the standardised output value and hence
the output flow is output as the root function of standardised pressure.
Depending on the decision made under "2.1.5.2 Transfer Function"
(Page 91), this parameter is displayed or hidden.
"2.1.5.4 Mass Flow Unit"
Factory setting: kg/s
Adjustment range: g/s, g/min, g/h, kg/s, kg/min, kg/h, kg/day, MetTon/min, MetTon/h, Met-
Ton/day, lb/s, lb/min, lb/day, ShTon/min, ShTon/h, ShTon/day, LTon/h,
LTon/day
Purpose: Selection of the unit for the mass flow measurement type
Description: This parameter allows you to select the unit for the mass flow measurement
type. The parameters associated with this unit are automatically converted
into the new unit.
"2.1.5.5 Mass Flow LRV"
Factory setting: 0 kg/s
Adjustment range: Freely selectable numeric value