Siemens EF 725 Series Manual de usuario descargar pdf (Pagina 3)

Sensor (URL) coefficient K5

The seal(s) constant time is calculated by the following formula

S6 (sec) = [K1 x (K2 + K3 x K4) x K5]

The total constant time of the transmitter/seal system is the

combination of relevant response times by the following

formula:

TTX (sec) = TTR + TS6) x 1.2] + 0.1

The following table details the transmitter time values (TTR) in

sec. for the transducers with specific filling fluids @25°C (77°F)

Sensor Code K5

0.4

0.2

Sensor Code

Silicone oil

DC 200

0.9

Inert

(Galden)

7.3

3.2

Silicone oil DC 200

Inert (Galden)

Fill Fluid K2

1.9

0.12

0.37

Overpressure limits (without damage to the transmitter)

• Lower : 0.067 kPa abs, 0,67 mbar abs, 0.01 psia

(0.13 kPa abs, 1.33 mbar abs, 0.02 psia for sensor A).

Double the lower limit with inert filling.

• Upper (transmitter sensor limit or flange / fitting rating of

the seal, whichever is less)

- model 621EM

sensor code A : 1 MPa, 10 bar, 145 psi

sensor code B : 5 MPa, 50 bar, 725 psi

- flanged seals (S6F)

ANSI CL 150 : 2 MPa, 20 bar, 290 psi

ANSI CL 300 : 5 MPa, 50 bar, 725 psi

DIN ND 16 : 1.6 MPa, 16 bar, 230 psi

DIN ND 40 : 4 MPa, 40 bar, 580 psi

Static pressure

Transmitters model 621EM operate within specifications

between the following limits

• Lower

atmosphere (the two sides are wetted)

• Upper

same of overpressure limit

Proof pressure

The transmitter meets SAMA PMC 27.1 requirements and can

be exposed without leaking to line pressure of up to 10 MPa,

100 bar, 1450 psi (2 MPa, 20 bar, 290 psi for sensor A) or two

times the flange/fitting rating of the seal, whichever is less.

R(kΩ) =

Supply voltage - min. operating voltage (Vdc)

Load limitations - 4-20 mA and HART total loop resistance :

Optional indicators

• Output meter (user adjustable)

- LCD : 3 1/2-digit with 10 mm (3/8 in) high, 7-segment

characters. Engineering unit labels are provided. LCD

output meter may be calibrated within the range -1999 to +

1999 with a span adjustable between 100 and 3998 units.

(Display of decimal point, if required, is switch selectable)

- analog : 36 mm (1.4 in) scale on 90°

• Integral display

- LCD: 4-digit with 8 mm. (5/16 in) high, 9-segment alphanu-

meric characters.

User-definable display mode with HART communication :

- process variable in engineering units, or

- percent of range, or

- process variable in engineering units and percent of range

alternating every 3 seconds, or

- process variable in engineering units and digital

output (4 to 20 mA) alternating every 3 seconds.

Factory selectable display mode with 4 to 20 mA output :

- percent of range

- percent of range and 4 to 20 mA output alternating every

3 seconds

Display also indicates diagnostic messages.

• CoMeter

- 5-digit (± 99999 counts) programmable with 7.6 mm. high (3 in),

7-segment numeric characters plus sign and digital point

- 10-segment bargraph display (10% per segment)

- 7-digit LCD with 6 mm. high (2.3 in), 14-segment alphanumeric

characters.

ELECTRICAL CHARACTERISTICS AND OPTIONS

• HART digital communication and 4 to 20 mA output

Power Supply

The transmitter operates from 10.5 to 42 Vdc with no load and

is protected against reverse polarity connection (additional load

allows operations over 42 Vdc).

For EEx ia and intrinsically safe (FM, CSA and SAA) approval

power supply must not exceed 30 Vdc.

Filling coefficient (K2 and K3)

Operating temperature coefficient (K4)

to be considered only for operating temperature less than

25°C (77°F)

K4 = T - 25 (absolute value)

Coefficient K4 should be considered = 0 for temperatures

above 25°C (77°F)

(volts)

MINIMUM OPERATING VOLTAGES

10.5

with integral display

with optional output analog indicator

with optional surge protection

with optional output LCD indicator

with optional output LCD indicator and surge protection

10.7 12.1 12.5 14.1

no link on output indicator plugs

14.3

with CoMeter

13.3

Supply voltage

Total loop resistance

250

(ohms)

1430

25 (ref.)10.5 (volts)42

4 to 20 mA only

4 to 20 mA and

HART digital communication

600

1 2 3 4 5 6 7 8 ... 11 12

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