Siemens EF 725 Series Manual de usuario descargar pdf (Pagina 4)

Optional surge protection

Up to 2.5 kV (5 kA discharge current) of 8 µs rise time/20 µs

decay.

Output signal

Two-wire 4 to 20 mA dc, user-selectable for linear or square root

output, power of 3/2 or 5/2, 5th order or two 2nd order switching

point selectable programmable polynomial output.

HART

communication provides digital process variable (%,

mA or engineering units) superimposed on 4 to 20 mA signal,

with protocol based on Bell 202 FSK standard.

Output current limits (to NAMUR standard)

Overload condition

- Lower limit : 3.8 mA dc

- Upper limit : 20.8 mA dc

Transmitter failure mode (to NAMUR standard)

The output signal can be user-selected to a value of 3.6 or

21.6 mA on gross transmitter failure condition, detected by self-

diagnostics.

In case of CPU failure the output is driven <3.6 mA or >21.6 mA.

• Profibus PA output

Power supply

The transmitter operates from 10.5 to 32 Vdc with no polarity.

For EEx ia approval power supply must not exceed 15 Vdc.

Intrinsic safety installation according to FISCO model.

Current consumption

- operating (quiescent) : 10.5 mA

- communicating : 20.5 mA

- fault current limiting : 16 mA max.

Output signal

Physical layer in compliance to IEC 1158-2/EN 61158-2 with

transmission to Manchester II modulation, at 31.25 kbit/sec.

Output interface

Profibus PA communication according to Profibus DP50170

Part 2/DIN 19245 part 1-3 compliant to Profiles 3.0 Class A & B

for pressure transmitter; ident. number 052B HEX.

Output update time : 25 ms

Function blocks

2 analog input, 1 transducer, 1 physical

Optional indicator

Integral display

- LCD : 4 digit characters, displaying process variable in

engineering units or as percentage value.

Display also indicates diagnostic messages.

Transmitter failure mode

On gross transmitter failure condition, detected by self-diagnos-

tics, the output signal can be driven to defined conditions,

selectable by the user as safe, last valid or calculated value.

• FOUNDATION fieldbus output

Device type

Link Active Scheduler (LAS) capability implemented

Power supply

The transmitter operates from 9 to 32 Vdc with no polarity.

For EEx ia approval power supply must not exceed 24 Vdc.

Intrinsic safety installation according to FF application guide.

Current consumption

- operating (quiescent) : 10.5 mA

- communicating : 20.5 mA

- fault current limiting : 16 mA max.

Output signal

Physical layer in compliance to IEC 1158-2/EN 61158-2 with

transmission to Manchester II modulation, at 31.25 kbit/sec.

Function blocks/execution period

2 standard Analog Input blocks / 25 msec. max (each)

1 standard PID block / 70 msec. max.

Additional blocks

Transducer block, 1 standard Resource block,

1 custom Pressure with calibration block

Number of link objects : 25

Number of VCRs : 24

Output interface

FOUNDATION fieldbus digital communication protocol to

standard H1, compliant to specification V. 1.4; FF registration

IT011000.

Optional indicator

Integral display

- LCD : 4 digit characters, displaying process variable in

engineering units or as percentage value.

Display also indicates diagnostic messages.

Transmitter failure mode

The output signal is "frozen" to the last valid value on gross

transmitter failure condition, detected by self-diagnostics which

also indicate a BAD conditions. If electronic failure or short

circuit occur the transmitter consumption is electronically lim-

ited at a defined value (16 mA approx), for safety of the network.

PERFORMANCE SPECIFICATIONS

Stated at ambient temperature of 23°C ± 3K (75°F ± 5), relative

humidity of 50% ±20%, atmospheric pressure, mounting position

with vertical diaphragm and zero based range for transmitter with

seal isolating diaphragms in AISI 316 L ss and silicone oil fill and

HART digital trim values equal to 4-20 mA span end points, in linear

mode.

Unless otherwise specified, errors are quoted as % of span.

Some performance data are affected by the actual turndown (TD)

as ratio between Upper Range Limit (URL) and calibrated span.

IT IS RECOMMENDED TO SELECT THE TRANSMITTER

SENSOR CODE PROVIDING THE TURNDOWN VALUE AS

LOWEST AS POSSIBLE TO OPTIMIZE PERFORMANCE

CHARACTERISTICS.

Accuracy rating

% of calibrated span, including combined effects of terminal based

linearity, hysteresis and repeatability.

For fieldbus versions SPAN refer to analog input function block outscale range

- ± 0.10% for TD from 1:1 to 5:1

- ± 0.02 x for TD from 5:1 to 10:1

Multiply the values by 2 for sensor/seal combination marked (•)

URL

span

1 2 3 4 5 6 7 8 9 10 11 12

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