Siemens EF 725 Series Manual de usuario descargar pdf (Pagina 2)

Sensor

code

Upper Range

Limit (URL)

621EM

Liquid level interface,

density

Lower Range Limit (LRL)

2.5 kPa

25 mbar

10 inH

10 kPa

100 mbar

40.1 inH2O

- 2.5 kPa

- 25 mbar

- 10 inH2O

- 10 kPa

- 100 mbar

- 40.1 inH2O

Minimum

Span

0.25 kPa

2.5 mbar

1 inH2O

1 kPa

10 mbar

4 inH2O

FUNCTIONAL SPECIFICATIONS

Range and span limits

Compatibility (allowed seal types)

Direct mount and one remote seal

(max length in m)

3in/DN80 wafer or flanged flush diaphragm seal (2)

2in/DN50 wafer or flanged flush diaphragm seal (2)(•)

3in/DN80 wafer or flanged flush diaphragm seal (4)

The combinations sensor code/ seal type marked (•) modify the base accuracy rating and static pressure effect; refer to performance

specifications.

GENERAL DESCRIPTION

Model 621EM is a specific application transmitter using a differen-

tial design for liquid level interface and density measurements,

typically for two non mixable liquids (one upon the other) of

different specific gravity, in a tank.

The transmitter has a defined structure with two seals :

- one direct mount flanged flush diaphragm seal is on the high

pressure side.

Turndown ratio (TD) :

up to 10:1

Span limits

Maximum span = URL

Minimum span = URL/TD

Zero suppression and elevation

Zero and span can be adjusted to any value within the range

limits detailed in the table as long as:

- calibrated span ≥ minimum span

Damping

Selectable time constant : 0, 0.25, 0.5, 1, 2, 4, 8 or 16 sec.

Electromagnetic compatibility (EMC)

Comply with EN 50081-2 for emission and EN 50082-2 for

immunity requirements and test; CE marking.

Turn on time

Operation within specification in less than 2 sec. with minimum

damping.

Insulation resistance

> 100 MΩ @ 1000 Vdc (terminals to earth)

- one remote seal, selectable wafer or flanged flush diaphragm, is

fitted via capillary to the low pressure side.

The seals should have the same physical characteristics (size,

materials, etc.) for the two sides; these are suitable to interface

tank nozzle of 2in/3in to ANSI or DN50/DN80 to DIN.

FILL FLUIDS

(APPLICATION)

OPERATING CONDITIONS

Silicone oil DC 200

(General purpose)

Inert (Galden)

(Oxygen Service)

Tmin

Tmax

@ P >of

-20

(-4)

-10

(+14)

150 (302)

@ 35 mbar abs

100 (212)

@ 75 mbar abs

• Ambient (is the operating temperature)

Silicone oil : -20 and +85°C (-4 and +185°F)

Inert : -10 and +85°C (+14 and +185°F)

Upper ambient limit for CoMeter : +70°C (+158°F)

• Storage

Lower limit : -50°C (-58°F); -40°C (-40°F) for LCD indicators

Upper limit : +120°C (+248°F); +85°C (+185°F) for LCD indicators

Time response

The time response of a transmitter/seal system is function of

some characteristics which define relevant coefficients as

follows :

Configuration coefficient (K1)

- 2in/DN50 seal : 9.2 x L

- 3in/DN80 seal : 9.2 x L

"L" is the capillary length of the remote seal; if present

Temperature limits

°C (°F)

• Process

The following table shows characteristics of fill fluid used in

the seals on the two sides of transmitter model 621EM.

1 2 3 4 5 6 7 ... 11 12

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