Siemens SITRANS P - Manual (Page 188)

2/188 Siemens FI 01 · 2009
2
s
Questionnaire
for hydrostatic level measurements
s
Order date: _______________________________________________
Processing date: __________________________________________
Ordering code (customer): _________________________________
Ordering code (supplier): __________________________________
Customer reference:_______________________________________
Measuring point: __________________________________________
Position: __________________________________________________
Dimensions: ______________________________________________
Pressure: bar
Temperature: K °C
Measuring range: cm m
(please mark with cross)
Order No. of transmitter 1) :
Y01
The different pressures and tem-
peratures (densities) in the vessel
and in the reference column result
in an offset in the start-of-scale
and full-scale values.
The calibration data are deter-
mined in addition.
It is also checked whether – as a
result of the range offset – the
ordered transmitter is suitable for
this measurement. Please supply the following characteristic data so that we can calculate the measuring range,
start-of-scale value, full-scale value and calibration data:
1) Reference line filled with condensation! Falling differential pressure with increasing level.
2) Reference line without gas or filled with gas (air). Rising differential pressure with increasing level.
3) If not specified otherwise, this value is assumed as the calculation pressure of the level meter.
The input signal (differential pressure) depends on the density (pressure and temperature).
The influence is practically negligible for a lowest liquid level of 20 to 30% of the distance between the
measuring points.
4) If a pressure correction of the level is required, the measuring range must be the same as the
distance between the measuring points, and the transmitter is designed for the calculation pressure
of 1 bar (absolute).
Pressure correction means: the static pressure and the temperature are measured separately and
calculated by a correction computer or measured-value computer.
7 M F 4 – –Z –
Please mark type of boiler with a cross: Closed
1)
Open or not under pressure
2)
Medium ____________________
Licensed boiler pressure (absolute) _______________ bar
Operating pressure (absolute) Lowest _______________ bar
Normal 3) _______________ bar
Highest _______________ bar
Temperature of reference column (cold) _______________ K
Distance between measuring points (dimension according to sketch) H
V
= _________ m
Measuring range
4)
= start-of-scale value to full-scale value
Start-of-scale value H
U
=___________ m
Full-scale value H
O
=___________ m
Position of equalizing vessel above bottom measuring
point if different from H
V
_______________ m
Please mark pressure correction of level with a cross: No
Yes 4)
© Siemens AG 2008