Siemens SITRANS P 7MF4232 Manual de usuario

SITRANS P

Absolute pressure transmitter, DS series (Smart)

7MF4232

OperatingInstructions C79000-B5676-C92-01

SIPART, SITRANS, SIMATIC

are Siemens registered trademarks.

All other product or system names are (registered) trademarks of their respective owners and must be treated

accordingly.

Thereproduction,transmissionoruseofthisdocumentoritscontentsisnotpermittedwithoutexpresswrittenauthority.Offenderswillbeliable

for damages.

All rights created by the granting of patents or registration of a design are reserved.

Technical datasubjecttochangewithoutnotice

SITRANS P

Absolute pressure transmitter, DS series (Smart)

(from the pressure transmitter series)

7MF4232

Operating Instructions

7MF4232Operating Instructions

2C79000-B5676-C92-01

7MF4232 Operating Instructions

C79000-B5676-C92-01

Contents

Page

1 Technical Description 5..................................................

1.1 Range of Application 5....................................................

1.2 How it works 5...........................................................

1.3 Technical Data 7.........................................................

1.4 Ordering data 11..........................................................

1.5 Dimensions 13............................................................

2 Installation 14............................................................

2.1 Installation 14.............................................................

2.1.1 Fixing with a mounting bracket 14..................................

2.1.2 Turning the measuring cell in relation to the housing 15...............

2.2 Electrical connection 16....................................................

2.3 Installing the analog indicator 18.............................................

2.4 Turning the digital indicator 18...............................................

3 Commissioning 19.......................................................

4 Operation 21.............................................................

4.1 Operation with PC/Laptop 21................................................

4.2 Operating from a HARTR-Communicator 21...................................

4.3 Operation on the transmitter 23..............................................

4.3.1 General 23......................................................

4.3.2 Setting the start of scale and full scale with the cover closed without viewing

window and activated key disable 24...............................

4.3.3 Operation with visible digital display and deactivated key lock 27.......

4.3.3.1 Setting start of scale and full scale with a pressure source 27..........

4.3.3.2 Setting start of scale and full scale without pressure transmitter 28.....

4.3.3.3 Correction of zero point 29........................................

4.3.3.4 Setting electrical damping 30......................................

4.3.3.5 ”Loop check” function 30..........................................

4.3.3.6 Output current in error situations 30................................

4.3.3.7 Disable pushbuttons and/or functions 31............................

4.3.3.8 Select display (current, %, pressure) 31.............................

4.3.3.9 Select engineering units 31........................................

4.4 Write protection 32.........................................................

5 Maintenance 33..........................................................

6 Conformance Certificates 34..............................................

7MF4232Operating Instructions

4C79000-B5676-C92-01

.Note

These instructions do not purport to cover all details or variations in equipment, nor to

provide for every possible contingency that may arise during installation, operation or

maintenance.

Should further information be desired or should particular problems arise that are not

covered sufficiently for the Purchaser’s purposes, the matter should be referred to the local

Siemens Sales Office.

The contents of this instruction manual shall not become part of or modify any prior or

existing agreement, commitment or relationship. The Sales Contract contains the entire

obligations of Siemens. The warranty contained in the contract between the parties is the

sole warranty of Siemens. Any statements contained herein do not create new warranties

or modify the existing warranty.

!Warning

This equipment should only be installed and operated after qualified personnel have

ensured that suitable power supplies are available. These personnel must ensure that the

equipment is not subjected to any hazardous voltages during normal operation or when a

defect occurs in the system.

This equipment may be used under high pressure and with aggressive media. Improper

use of this equipment may therefore result in severe personal injury or extensive damage to

property.

The successful and safe operation of this equipment is dependent upon its proper handling,

installation, operation and maintenance.

Qualified person

For the purposes of this manual, a qualified person is one who is familiar with the installation, commission-

ing and operation of this equipment. In addition, the person must be:

.Trained and authorised to operate and service equipment/systems in accordance with established

safety practices relating to electrical circuits, high pressures and aggressive media.

.Trained in the proper care and use of protective equipment in accordance with established safety

practices.

.Trained in rendering first aid.

7MF4232 Operating Instructions

C79000-B5676-C92-01

1 Technical Description

1.1 Range of Application

The Smart version of the SITRANS P transmitter measures the absolute pressure of non-aggressive and

aggressive gases, steam and liquids.

Measuring spans between 8.3 mbar and 30 bar are possible. The output signal is a load-independent

direct current of 4 to 20 mA which is linearly proportional to the absolute pressure.

Transmitters with intrinsic safety and flame--proof enclosure protection type can be used in areas where

there is an explosion hazard (zone 1). The certificates of conformity satisfy the European standard

(CENELEC) the American standard (FM) or the Canadian standard (CSA).

The transmitters are available with various types of chemical seal for special applications, e.g. measuring

high viscous substances.

1.2 How it works

The pressure is transferred via the isolating diaphragm (2, fig. 1.1) and the liquid filling (3) to the silicon

absolute pressure sensor (4) and its measuring diaphragm distorted. Four doped piezo-resistors in bridge

circuit in the measuring diaphragm change their resistance as a result. This change in resistance causes

a bridge output voltage proportional to the input pressure which is transformed through a measuring

amplifier (11) in an analog-digital converter (12) into a digital signal. The measuring signal is evaluated

by a microcontroller (13), corrected with respect to linearity and temperature behavior and transformed

by a digital-analog converter (14) into the output current 4 to 20 mA.

The measuring cell-specific data and the data for parameterization of the transmitter are stored in a

non-volatile EEPROM.

The cable termination point and the electronics’ side are arranged opposite.

The transmitter is parameterized with a PC/laptop or HARTR-Communicator. The PC/laptop is

connected to the two-wire circuit via the HARTR-Modem. The signals necessary for communication

accordingtotheHARTRprotocol, Revision 5.1, are superimposed on the output current according to the

frequency shift keying method (FSK, Frequency Shift Keying).

The following parameters can be set or their current settings interrogated:

- Measuring point number

- Measuring point description

-Text

- Upper limit of output signal

- Measuring limit

- Transmitter design (e.g. materials)

- Measuring range *

- Engineering unit *

- Measured value in mA, % or engineering units *

- Damping *

- ”Loop check” function *

- Output current in the event of an error *

- Pushbutton and/or function disable *

In addition to the parameterization with a PC/laptop or HARTR-Communicator (see Figure 1.2) the start

of scale and full scale can be ”fixed” on the transmitter with three external pushbuttons; the parameters

marked with*can be set directly on the transmitter using the digital display without opening the housing.

7MF4232Operating Instructions

6C79000-B5676-C92-01

IAOutput current

UHAuxiliary power

peInput variable pressure

1 Process cover

2 Overload diaphragm

3 Filling liquid

4 Silicon absolute pressure sensor

11 Measuring amplifier

12 Analog-Digital converter

13 Microcontroller

14 Digital-Analog converter

15 Digital indicator

16 Analog indicator (option)

μC

Figure 1.1 SITRANS P absolute pressure transmitter, function diagram

SITRANS P

Transmitter

---

Auxiliary power

PC/Laptop

RS-232-C

HARTR-

Communicator

HARTR-

Modem

---

230 Ω

to 500 Ω

(230 Ωto 1100 Ωfor HartRcommunicator)

Figure 1.2 Communication between PC/Laptop or HARTR-Communicator and SITRANS P

transmitter

7MF4232 Operating Instructions

C79000-B5676-C92-01

1.3 Technical Data

Functional data

Measuring spans and overrange limits

Variable measuring spans Overrange limits

8.3 to 250 mbar ≙0.83 to 25 kPa

43 to 1300 mbar ≙4.3 to 130 kPa

160 to 5000 mbar ≙16 to 500 kPa

1000 to 30000 mbar ≙100 to 3000 kPa

6 bar

10 bar

30 bar

100 bar

.Note for the 250 mbar measuring cell:

This measuring cell is designed for operation within the measuring limits 0 mbar (abs) to

250 mbar (abs). When storing under normal ambient pressure of about 1000 mbar (abs)

the measuring cell is in the overload state. An overrange error may occur in this state. The

overrange error disappears when operating within the measuring limits. Then the

transmitter operates within its specification again; it may be necessary to readjust the start

of the measuring range.

In pressure measurements with repeated exceeding of the measuring limits (e.g. batch

processes with transitions between vacuum and ventilation) a measuring cell with a

maximum range of 1300 mbar should be selected to avoid overrange errors.

Lower measuring limit

Silicone oil filling 0 mbar (abs)

Inert filling liquid --20 _Cto60_C:

30 mbar(abs)

+60 _C to +100 _C:

30 mbar(abs) +20 mbar(abs) x()

Tem p. i n _C--60_C

Upper measuring limit 0 and 100 % of the max. measuring span

Start of scale anywhere between the measuring limits

Auxiliary power

Terminal voltage on the transmitter 11 to 45 V, DC

11 to 30 V DC in intrinisically safe operation

Ripple Upp ≤0.2V(47to125Hz)

Noise Urms ≤1.2mV(0.5to10kHz)

Output signal 4 to 20 mA

lower limit 3.84 mA

upper limit 20.5 to 22.0 mA 1)

in the event of an error 3.6 mA or 22.8 mA

ripple Ipp ≤0.5 % of the maximum output current

1) adjustable with PC/Laptop or HART-Communicator; factory set 20.5 mA.

7MF4232Operating Instructions

8C79000-B5676-C92-01

Load R≤UH–11 V

0, 023 Ain Ω,

UH: auxiliary power in V

230 to 500 Ωfor communication with PC/Laptop

230 to 1100 Ωfor communication with ≥230 Ω

HARTR-Communicator

Electrical damping

variable time constant 0 to 100 s

Current sensor adjustable 3.6 mA to 22.8 mA

Permissible ambient temperature 1) -- 4 0 _Cto+85_C silicone oil

-- 2 0 _Cto+85_C inert filling liquid

Observe temperature class in hazardous locations!

Permissible medium temperature --40 _C to +100 _C silicone oil

-- 2 0 _C to +100 _C inert filling liquid

Permissible storage temperature --50 _Cto+85_C

Condensation permitted

Transmission behavior

Start of scale 0 bar, rising characteristic, silicone oil filling and isolating diaphragm made of stainless

steel. All data refer to the output span.

Measuring span ratio MSma

r= MSmax = maximum span

MS = set span

Measurement error when calibrating fixed

point (including hysteresis and reproducibi-

lity)

≤0.1 % at r ≤10

≤0.2 % at r >10

Time constant T63 at 20 _C

(without electrical damping)

about 0.2 ms

Long-term drift ≤0.2 % every 12 months at max. span

Influence of the ambient temperature

at --10 _Cto+60_C≤(0.1 r+0.2) %

at --40 _Cto--10_C and

+60 _Cto+85_C

≤(0.1 r+0.15) % / 10 K

Influence of the auxiliary power ≤0.005 % per 1 V change in voltage

Influence of the installation position ≤0.05 mbar to 10_of deviation

Electromagnetic compatibility

Resistance to interference EN 50082-2 and NAMUR NE 21, May 1993

Spurous emission EN 50081-1

1) Note:

At temperatures below --20 _C the digital indicator may no longer be legible under some circumstances due to its inertia.

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