Citec DE38 Manual de usuario

DE38

Instruction Manual

Digital Differential Pressure Transmitter / Switch

Citec

Allée du plateau

Bât 2

ZI Nord

77200 TORCY

Tel : +33 (0) 1 60 37 45 08

Fax : + 33 (0) 1 64 80 45 18

Email : [email protected]

www.citec.fr

1.2 Principles of Operation

The instrument uses a tough, flexible sensing dia-

phragm embedded between stiffening plates and

balanced by springs on either side. The diaphragm

is at zero position when pressures on either side of

the diaphragm are equal. Inequality of pressures

results in deflecting the diaphragm towards the low-

er pressure side until a new equilibrium determined

by the changed balance of forces is reached. Fas-

tened to the center of the diaphragm is an axial rod,

the other end of which forms the moving core of an

inductive displacement transducer. The linear dis-

placement of the core is proportional to the pres-

sure difference across the diaphragm. This dis-

placement is converted by the transmitter's elec-

tronic module to a standard electrical signal output.

An optional output signal can be slew rate limited,

spreaded, inverted and piecewise transformed non-

linearly by means of a table function.

2Installation

The electronic module is mounted on a flat plate or

panel, for which it has 4 holes at the rear for self-

tapping screws 3.5mm.

A wall-mounting rear adaptor plate is available as

an option (s. Ordering Code).

The pressure transmitters are calibrated at the fac-

tory while mounted vertically, pressure ports down-

ward. However, they can be mounted in any orien-

tation. If they are installed with any orientation other

than vertical (pressure ports downward), the zero

point must be reset (s. section 5.3.2).

IP65 protection for the housing is guaranteed only if

suitable connecting cable is used.

If the instrument is intended for outdoor application,

we highly recommend using an adequate protective

housing (or at least a big enough shelter) as per-

manent protection against UV-radiation on the

membrane keyboard and against exposure of the

instrument to rain or snow.

1Product Description and Functions

1.1 Block Schematic Diagram

NU 158 22/07/16

2.1 Process Connections

•Only qualified technicians authorized for this

type of work should undertake installation.

•Ensure that the mechanical configuration and

materials of construction of the instrument are

compatible with the process media.

•Ensure that process equipment and pressure

lines are at atmospheric pressure before mak-

ing pressure connections.

•Pressure lines must have a downward gradient

throughout from the pressure instrument to the

process vessel/pipe. This is to prevent for-

mation of air/gas pockets (for liquid applica-

tions) and liquid plugs (for air/gas applications).

•Pressure lines must be kept as short as possi-

ble and must not have short bends to avoid

measurement errors induced by pressure line

delays.

•The instrument should be provided with suitable

protection against pressure surges (e.g., snub-

ber or pulsation damper).

•Ensure that process pressure is always less

than the specified safe pressure rating.

The instruments pressure ports are marked by ""

and "" symbols. For differential pressure applica-

tions the "" port must be connected to the higher

pressure and the "" port should be connected to

the lower pressure.

If the pressure transmitter is subjected to pressure

when it is started up, zero point checking and ad-

justment is not possible. In such cases, only electri-

cal connections of the instrument should be made,

but not the pressure connections.

2.2 Elektroanschluss

•Only qualified technicians authorized for this

type of work should undertake installation.

•Switch off electrical power to the plant before

attempting electrical installation work of any

kind.

•Do not disconnect under voltage.

3-wire circuit

Connector 1: Supply voltage and output signal

For nominal supply voltage, the operating supply

voltage range and the maximum output signal loads

see chapter Specifications.

The signal ground line (-Sig) is internally connected

to the instrument ground (-Uo), and serves only as

an alternative ground connection for the output sig-

nal. This usually increases the noise margin.

Connector 2: Switch outputs

Switching output 1 (SP1) is configured by parame-

ters R1A, R1E, R1D and R1F.

Switching output 2 (SP2) is configured by parame-

ters R2A, R2E, R2D and R2F.

For more information see section 5.3.8.

Trans

mitter

Stromver-

sorgung

SP1no

SP2com

SP2no

SP1com

Internally bridged

GN/YE

Signal -Sig

Supply –Uo

Signal +Sig

Supply +Uo

Output

Evaluation

unit i.e. PLC

Input

-Sig /

+Sig

-Uo

Output

230V

+Uo

-Uo

3Starting Operation

All electrical supply, operating and measuring lines

and the pressure connections must have been cor-

rectly installed before commissioning. All supply

lines shall be arranged such that there are no me-

chanical forces acting on the device.

Check the leak-tightness of the pressure connec-

tions before commissioning.

•The 3½ character LED display presents the

current differential pressure in normal operating

mode.

•The selected measuring unit is highlighted at

the right of the display.

The units represented on the screen may devi-

ate from the actual design.

•Above the display, two LEDs symbolise

the condition of the switching outputs. As soon

as the switch is closed, the applicable LED

lights up.

3.2 Control keys

The control keys have the following functions:

Menu down

Decrease value

Enter key

Menu up

Increase value

By using the middle ûkey on the membrane key-

pad you can access the parameter menu (settings

mode). The display now shows the text ESc.

By using the right þkey you can move up within the

menu and can now select numerous parameters.

By pressing the left ÿkey, you can move down-

wards in the menu and finally get back to the ESC

parameter.

By pressing the middle ûkey you can call up a pa-

rameter.

Using the ÿ and þ keys, you can then set the pa-

rameter value.

In order to take on the adjusted parameter value,

press the û key.

All adjusted parameters are first then saved if you

leave the menu via the ESC parameter.

3.3 Configuration

For commissioning there is a multitude of setting

options for optimum adaptation of the device to the

measuring point and task at hand. This section co-

vers these options step by step.

Depending on the device design available,

some

menu points are not available. For example, all

characteristic curve functions are masked from the

menu if the device does not have a signal output.

The device can be completely set con-

veniently on the PC using a PC adaptor.

There all parameters are immediately

visible and accessible. In addition, the

complete configuration can be loaded, saved and

documented as a control print-out. Further guide-

lines on this program can be found in the documen-

tation for this program (see accessories).

3.3.1 General

Put the device electrically into operation and ensure

that the device is initially depressurised (if neces-

sary, disconnect the pressure connection lines).

In order to set a parameter, proceed as follows:

•Press the Enter ûkey in order to switch into the

menu. ESc will appear on the display.

•Use the ÿþarrow keys in order to select a pa-

rameter from the list.

•Press the Enter ûkey in order to call up the pa-

rameters.

•Use the ÿþarrow keys to set the required val-

ue.

•Use the Enter ûkey to save the value.

After you have set all the parameters, leave the

menu as follows:

•Using the ÿþarrow keys, set the ESc parame-

ter. You can find this both at the start and at the

end of the parameter list.

•Use the Enter ûkey to leave the menu.

3.3.2 Selection of pressure unit

First select the required pressure measuring unit.

The unit currently valid is highlighted on the right

next to the figure display. For setting, use the mid-

dle ûkey and then look using the right þkey for

With reference to the transmitter signal, voltage output, current

output etc.

Only when you leave the menu via the ESC parameter are the

set parameters valid.

3.1

Display Switching

Output1

Switching Output 2

3½ digits LED Display

Control keys

Measuring

unit

the EIN parameter. Press ûagain and then change

the value shown using þor ÿ. After selection, save

the value with ûand ON will appear again in the

display.

To complete, leave the settings mode. Press ÿuntil

ESc and then û. Now the pressure currently meas-

ured is represented. On the right of this, the correct

pressure unit should be highlighted.

The display circumference is limited to ±1999.

For this reason not all specified pressure units

may in individual cases be selectable.

3.3.3 Zero point control and adjustment

Ensure that the device is depressurised (if neces-

sary, disconnect the pressure connection lines).

If the device does not indicate precisely zero,

please note the shown value. The OF1 parameter

enables you to adjust the offset exactly to zero. To

do this, you must enter the noted value with the

sign reversed, and save it under OF1.

The entered value is purely a number value; no

decimal point is shown

If the device has already been used, values for the

OF1 and nP parameters may have been entered. In

this case please set both parameter values to zero

and carry out the zero point alignment again.

After zero-point adjustment, the pressure sensing

lines can be reconnected.

3.3.4 Damping and zero-point stabilizing

If there are unsteady pressure readings at this point

of time or during operation, you can use parameters

DAM and NP to stabilise the reading (and the output

signal).

The DAM parameter acts like a capillary throttle.

However, it only has an effect on the display, the

output signal and the switch points but not on the

measuring cell itself. You can set the response time

to pressure jumps using this parameter. The values

range comprehends 0.0 to 100.0 seconds.

With maximum damping, it will take more than 2

minutes for the reading also to reach zero after

a pressure jump from nominal pressure (100 %)

to zero.

In many cases, unsteady readings are not a prob-

lem during normal operating mode, but this is not

true for the idle state, i.e. if zero (differential) pres-

sure is expected.

In such situations, parameter NP can be applied. Its

value defines a measuring value range of around

zero. The measuring value is set to zero within this

range.

Example:

For NP, a value of 0.08 mbar

is entered. In this

case all pressures which lie within a range of -

0.08 mbar to +0.08 mbar become zero. Only if

the pressure exceeds these limits, will the read-

ing no longer indicate zero. The pressure value

and the reading do not however accord one

hundred percent with each other. Only after a

doubled value, i.e. from 0.16 mbar, will the

measuring pressure and the reading match

again.

3.3.5 Setting the output signal

The transmitter output signal primarily depends on

the measured pressure. However, you have the op-

tion to adjust the output signal to a large extent to

suit your requirements.

However, the basic measuring range (indicated

on the type label) and the type of output signal

(voltage or current) are not variable.

The parameters MA (Start of measuring range) and

ME (End of measuring range) define the limits to

which the output signal can change at all. Both val-

ues are adjustable across the entire basic measur-

ing range. The set values always refer to pressures

in the relevant valid pressure unit and are converted

when the unit is changed.

The allocated signal values for MA and ME cannot be

changed (see type label, e.g. 0...10 V or 4...20 mA).

If MA ME, we speak of a rising characteristic curve.

The output signal increases as the pressure rises.

If MA > ME, we speak of a falling characteristic curve

and the output signal decreases as the pressure

rises.

The difference between values MA and ME must be at

least 25 % of the basic measuring range. The soft-

ware will not allow larger spreads. You will not be

able to exit the menu if you have entered incorrect

range values.

Example:

With a basic measuring range of 400 Pa, the

following must apply: MA –ME 100 Pa.

3.3.6 Output signal limits (Namur)

The three parameters oG1, oG2 and oEr determine

independent of the pressure, the limit values for

output currents or voltages which must not be un-

derrun or exceeded.

These limit values are superordinate to the

range determined through MA and ME. They

serve mainly to suppress error messages in

downstream systems through short-term meas-

uring range exceedances.

0.08 mbar 8 Pa

With the oG1 parameter, the limit value for the mini-

mum output signal is determined. The output signal

cannot underrun this value. Generally this parame-

ter is only expedient for devices with an output sig-

nal of 4...20 mA, because on these devices a value

below 3.8 mA is often evaluated as an error signal.

With the OG2 parameter, the limit value for the max-

imum output signal is determined. The output signal

cannot exceed this value. This parameter can be

used for all outputs (voltage and current) in order to

limit the maximum value to e.g. 10.2 V.

With the oer parameter, the value for the error sig-

nal is determined. The value specified with oEr is

emitted as an output signal if the device detects an

internal error and work no longer correctly. Howev-

er, not all possible errors and defects can be de-

tected by the device.

If you set oG1 = OG2 = 0, the output signal is no long-

er checked for limits.

If you set oG1 to the maximum value

(11 V or 21 mA), you can change using

OG2 the output signal independent of

pressure from zero to the maximum

value. It is not necessary to leave the menu item;

the output is then carried out immediately. You then

operate the device as a signal transmitter and can

then easily check the other signal processing.

3.3.7 Characteristic curve function F

For certain applications, a pressure measurement is

only an indirect measurement for the actual varia-

ble. Flow measurement across an aperture or filling

level determination through hydrostatic pressure

measurement are two typical examples of this. In

these cases it may be necessary to change the

output signal of the transmitter through a non-linear

characteristic curve so that the subsequent evalua-

tion receives a signal linearly proportional to the ac-

tual measured value (e.g. volume in m³ or volume

flow in cm³/s etc.)

The Fparameter allows you to select between the

following variants:

Characteristic curve

Linear characteristic curve (standard)

Root-extracted characteristic curve

Horizontal cylindrical tank

3...30

Support point table with 3 to 30 value pairs

Whenever you change the value of F, the program

will create a new table. All previous table values are

rejected and replaced with new linear entries.

The tables for types F = 0 to F = 2 are not visible.

Here internal values are used for table calculation.

These values cannot be modified.

For F= 3...30, you only have influence on the 1...28

intermediate values (see section 5.3.7) you only

have access to the start and end value via the MA

and ME parameters.

If the parameters MA and ME are changed, the

table will be deleted and F= 0 is set.

At the start of measuring range (MA), 0% is emitted

by the output signal (e.g. 0 mA).

At the end of measuring range (ME), 100% is emitted

by the output signal (e.g. 20 mA).

3.3.8 Menu jump LIN

If the value of Fis larger than or the same as 3,

there is a submenu LIn. Here you can access all ta-

ble values except for the start of the table (MA) and

the end (ME).

This submenu has its own entry and exit point,

which is represented with End. The table is not

saved until you switch back to this point in the main

menu, meaning that you switch back using the û

key to the LIN parameter.

If the table is not structured correctly, an error mes-

sage Err will appear at this point, and you will not

be able to exit the submenu.

The table consists of 2...29 value pairs. On a device

with a power output, the first value pair is {I02|P02}

The initial value I02 determines the level of the out-

put signal. The second value P02 determines at

which pressure the output signal should be emitted.

Then come the value pairs {I03|P03} ... {I29|P29}.

The entry of or changes to the table values via the

membrane keyboard is extremely strenuous and

prone to errors. It is only intended as an emergency

solution in case access to the PC adaptor is not

possible.

The table is correct if the following applies for all

signal values: the value is larger than the previous

value. For the pressure values, therefore, either the

larger (rising characteristic curve) or the lower (fall-

ing characteristic curve) apply accordingly. A transi-

tion from a rising to a falling characteristic curve or

vice versa is not permitted.

3.3.9 Switch Points

The two switching outputs are configured

through four parameters each.

The function of the switching output is deter-

mined through the parameters R1A, R1E, R1D and R1F.

The function of the switching output is deter-

mined through the parameters R2A, R2E, R2D and R2F.

R1A determines the switch-off point, and R1E deter-

mines the switch-on point for switching output 1.

With a voltage output {u02|P02} ... {u29|P29}.

The values are set in the valid measuring unit

(shown on the right).

Together, both the R1A and R1E parameters deter-

mine the switching function of switching output 1:

If R1A is smaller than R1E, the output switches on if

the measuring value exceeds R1E. It does not switch

off until the measuring value underruns R1A (hyste-

resis function).

If R1A and R1E are equal, the output switches on if the

measuring value exceeds R1E and off if the measur-

ing value underruns R1A.

If R1A is larger than R1E, the output switches on if R1E

< measuring value < R1A applies (window function).

Both parameters can be set independently across

the entire measuring range.

If the measuring unit is switched, the switch points

are recalculated accordingly. Here rounding errors

may cause deviations in the last point.

R1D allows the reaction of the switching output 1 to

be delayed by 0.0 to 100.0 s. This value applies

equally for switch-on and switch-off.

R1F reverses the function of the switching output. If

the value = 1, the switching output functions as an

NO contact, if the value = 2, the switching output

functions as an NC contact.

3.3.10 Password

The last menu item -P- serves for the input of a

password. A value of 001 to 999 can be selected as

a password. The value 000 renders the password

function invalid.

If a password was assigned, a text PAS is shown af-

ter ESc and û, and you must enter the right value by

using ûand þ ÿ. Only by doing so will you be able

to access all other menu items. In the event of an

error, the reading goes back to the start of the

menu ESc.

If the password is forgotten, it can only be reset

by the manufacturer or overwritten via the PC

adapter.

3.3.11 Display Options

The D0 parameter permits the reading to be stead-

ied if the measuring value fluctuates severely. This

filter function is similar to the dAM function, but has

an effect only on the display and not on the output

signal. With D0 = -1, only the switch point LEDs can

be controlled. With D0 = -2, these are switched off.

3.3.12 Reset to Default values

The res function serves to reset all settings to de-

fault. Default values can only be defined via PC in-

terface.

3.3.13 Free Unit

If the device is designed for a "free" third unit

(membrane symbol: ), the display can be scaled

at will using the parameters MAF, MEF and dPF.

The measuring range defined through the parame-

ters MA and ME is converted into MAF and MEF. Here

the table function (F) is also taken into account. The

value of dPF determines the position of a decimal

point.

3.4 Parameter overview

After switching on the device, it will briefly indicate

the software version number and then enters the

normal operating mode. By using the middle ûkey

on the membrane keypad you can access the pa-

rameter menu. The reading now shows the text ESc.

By using the right þkey, you can choose the pa-

rameters from the following list one by one:

Note:

Depending on the device design, individual pa-

rameters may not be available if the device

does not possess this feature.

PAS

Enter password

(only comes up if password is active),

values range 000..999

000 = deactivated

DAM

Damping

(Jump response time T90),

values range 0.0...100.0s

Display damping

Value range -2...0...100.

-2 = Display off, LED switching pt. off

-1 = Display off, LED switching pt. on

0 = Display on, LED switching pt. on

1...100 Display damping

R1A

Switch-off point

From switching output 

R1E

Switch-on point

From switching output 

R1D

Switching delay

From switching output 

Values range 0.0 to 100.0s.

This value applies equally for switch-on

and switch-off.

R1F

Switching function

From switching output 

Values range 1,2

1 = Switching output as NO contact,

2 = Switching output as NC contact

R2A

Switch-off point

From switching output

R2E

Switch-on point

From switching output 

R2D

Switching delay

From switching output 

Values range 0.0 to 100.0s.

This value applies equally for switching

on or off.

R2F

Switching function

From switching output 

Values range 1,2

1 = Switching output as NO contact,

2 = Switching output as NC contact

EIN

Measuring range unit

Values range 1,2,3

The selection is highlighted on the

right-hand side next to the display. Not

all basic measuring ranges allow any

switching. The respective unit size can

only then be selected if the basic

measuring range of the device can be

represented meaningfully

Start of measuring range

The measuring value is set in a way

that results in a minimum output signal.

(e.g.: 0V, 0mA or 4mA).

End of measuring range

The measuring value is set in a way

that results in a maximum output sig-

nal. (e.g.: 10 V or 20 mA).

dPF

Position of decimal place

for free unit.

MAF

Measuring range start point

(displayed value) for free unit.

MEF

Measuring range end point

(displayed value) for free unit

ofi

Offset correction measuring input 1

Value range -⅓FS...0... +⅓ FS

Zero point stabilisation

Value range 0...⅓FS

Characteristic curve function

Value range 0...30

0 = linear,

1 = root-extracted,

2 = horizontal cylindrical tank

3..30 = table

lIn

Menu entry

Submenu table processing

If F < 3, this menu item is masked.

oG1

Limit value

Minimum output signal

OG2

Limit value

Maximum output signal

OEr

Error signal

(Output signal in case of error)

res

Reset

All parameters to default values (speci-

fication of default values via PC)

-P-

Password settings

Value range 000 to 999

The value 000 means no password

protection.

4Maintenance

The device does not require maintenance.

In order to ensure reliable operation and a long ser-

vice life of the device we recommend regular check-

ing of the device as follows:

•Check the function in connection with slave

components.

•Check the tightness of the pressure connection

lines.

•Check the electrical connections.

The exact test cycles have to be adapted to the op-

erating and environmental conditions. The operat-

ing manuals of all other devices are also to be ob-

served if there is an interaction of different device

components.

5Transport

The product must be protected against severe im-

pacts. Therefore transport is to be effected only in

the packaging intended for transport.

6Service

All defective or faulty devices are to be sent directly

to our repair department. We would like to ask you

to coordinate all device returns with our sales de-

partment.

Remaining medium in and on disman-

tled measuring instruments may cause

danger to persons, environment and

equipment. Take reasonable precau-

tions! Clean the instrument thoroughly if necessary.

7Accessories

•M12 connectors with pre-wired cable lengths on

request.

•PC serial interface adaptor with software model

EU03.F300.

8 Disposal

Protect your environment....

Kindly help us protecting the envi-

ronment and dispose of or recycle the

used products in accordance with the

relevant regulations.

9Specifications

Measuring range

mbar

0…400

bar

0…0,6

0…1

0…1,6

0…2,5

0…4

0…6

static operating pressure

bar

max

straight line error °

%FS

max

2,5

typ

0,8

TC span °°

%FS/10K

max

0,8

0,4

typ

0,2

TC zero point °°

%FS/10K

max

0,8

0,5

typ

0,2

° : Straight line error = nonlinearity + hysteresis; at 25°C; pressure within specified range (characteristic linear, not spreaded)

°° : Pressure within specified range (characteristic linear, not spreaded); compensated temperature range 0 to 60°C

General

Operating temp. (ambient)

-10 … 70°C

Operating temp. (media)

-10 … 70°C

Storage temperature

-20 … 70°C

Protection class (housing)

IP 65 according to DIN EN 60529

Electrical

Nominal supply voltage

24 V DC/AC

Operating supply voltage Uo

12 … 32 V DC/AC

Electrical connection type

3 wire circuit

Characteristic curve

programmable (s. section 5.3.6)

Power consumption

approx. 2 W/VA

Display

3½ digit LED

Output signal

0 … 20 mA resp. 4 … 20 mA

0 … 10 V

Signal load





 













 

Programmable switching contacts

2 sets of voltage free relay contacts

as make (no) or break (nc) contact

2 sets of voltage free solid state relay SPST5

as make (no) or break (nc) contact

Umax

32 V AC/DC

3…32 V AC/DC

Imax

2 A

0,25 A

Pmax

64 W/VA

8 W/VA

Connections

Process connections

G 1/8 female threads with optional cutting ring fittings for 6 or 8 mm tube

Electrical connections

Two round-shell multi-pin connector sockets (M12, male)

Connector 1: 5-pin power input and analog signal output

Connector 2: 4-pin relay contacts / solid-state switch outputs

Materials

Housing

Polyamid PA 6.6

Media contact

Brass, VITON®, NBR

Mounting

Rear mounting holes for panel mounting

Wall mountable using adaptor plate

SPST: Single Pole Single Throw

10 Programming

Via membrane key-switches or by using PC-programming interface (EU03 s. accessory); programming mode

can be password protected.

Settings

Damping

0...100 s (10 / 90% step response time) for signal output, display separated

Switching outputs 

activation point, de-activation point, response time delay (0...100 s), as make (no) or break (nc) contact

Measuring range unit

bar, kPa, „free unit“ , start value, end value and decimal place for „free unit“

Zero suppression

0...⅓ of measurement range (1)

Output signal

can be set at any point of measuring range (2)

Offset correction

± ⅓of measurement range (3)

Output characteristic curve

linear, square rooted, horizontal cylindrical tank, table (3...30 entries)

Password

001 … 999, (000 = password protection disabled)

(1) Measured value deviations symmetric about zero are set to zero (Used for zero drift suppression).

(2) Maximum effective turn-down ratio = 4:1. Only the output signal is affected. Transfer function is inverted if start value > end value.

(3) Zero calibration setting may change with mounting orientation.

11 Dimensions

(All units in mm unless stated otherwise)

Wall mounting adaptor plate

(optional)

Rear view without

Wall mounting adaptor plate

(Standard)

Connector 1

Connector 2

G1/8 female

M12 connector

Cutting ring fittings for 6 or 8 mm tubes

Holes for sheet-metal

screw Ø3.5

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Dejero

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Rosemount

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Speaka Professional

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trubomat

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Teledyne Analytical Instruments

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Rondish

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Burkert

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Firetide

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Tele Radio

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Rotronic

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Jamara

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