Siemens P technical specifications 188, Y01

s

© Siemens AG 2008

Questionnaire

for hydrostatic level measurements

2

Order date: _______________________________________________

Processing date: __________________________________________

Ordering code (customer): _________________________________

Ordering code (supplier): __________________________________

Customer reference:_______________________________________

Measuring point: __________________________________________

Position:__________________________________________________

Dimensions: ______________________________________________

Pressure:	bar
Temperature:	K
Measuring range:	cm
(please mark with cross)

Order No. of transmitter 1):

7 M F 4 –

Y01

°C

m

–

–Z

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:

Please mark type of boiler with a cross: Closed1)

Open or not under pressure2)

Medium ____________________

Licensed boiler pressure (absolute)			_______________	bar
Operating pressure (absolute)	Lowest		_______________	bar
	Normal3)		_______________	bar
	Highest		_______________	bar
Temperature of reference column (cold)			_______________	K
Distance between measuring points (dimension according to sketch) HV = _________				m
Measuring range4) = start-of-scale value to full-scale value
	Start-of-scale value		HU =___________	m
	Full-scale value		HO =___________	m
Position of equalizing vessel above bottom measuring			_______________	m
point if different from HV
Please mark pressure correction of level with a cross:		No
		Yes4)

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.

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Siemens FI 01 · 2009