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Operating Manual

Pressure transmitters for IS-areas

DMU 30

0123

READ THOROUGHLY BEFORE USING THE DEVICE

KEEP FOR FUTURE REFERENCE

ID: 900.100.1073 | Version: 08.2022.0

1. General and safety-related information on

this operating manual

This operating manual enables safe and proper handling of the

product, and forms part of the device. It should be kept in close

proximity to the place of use, accessible for staff members at

any time.

All persons entrusted with the mounting, installation, putting into

service, operation, maintenance, removal from service, and

disposal of the device must have read and understood the

operating manual and in particular the safety-related information.

The following documents are an important part of the

operating manual:

- data sheet

- type-examination certificate

For specific data on the individual device, please refer to the

respective data sheet.

Download these by accessing

www.afriso.com

or request them:

[email protected] | phone: +49 7135 102-211

The IS versions of our products are variants of the standard

products.

Example:

Standard: DMU 30  IS version: DMU 30 ...IS

In addition, the applicable accident prevention regulations,

safety requirements, and country-specific installation standards

as well as the accepted engineering standards must be

observed.

For the installation, maintenance and cleaning of the device, the

relevant regulations and provisions on explosion protection

(VDE 0160, VDE 0165 and/or EN 60079-14) as well as the

accident prevention regulations must absolutely be observed.

The device was designed by applying the following standards:

EN IEC 60079-0:2018;

EN 60079-11:2012

1.1 Symbols used

Type and source of danger

Measures to avoid the danger

Warning word

Meaning

Imminent danger!

Non-compliance will result in

death or serious injury.

DANGER

Possible danger!

Non-compliance may result in

death or serious injury.

WARNING

Hazardous situation!

Non-compliance may result in

minor or moderate injury.

CAUTION

NOTE

- draws attention to a possibly hazardous situation that

may result in property damage in case of non-compliance.



Precondition of an action

1.2 Staff qualification

Qualified persons are persons that are familiar with the

mounting, installation, putting into service, operation,

maintenance, removal from service, and disposal of the product

and have the appropriate qualification for their activity.

This includes persons that meet at least one of the following

three requirements:

They know the safety concepts of metrology and

automation technology and are familiar therewith as

project staff.

They are operating staff of the measuring and

automation systems and have been instructed in the

handling of the systems. They are familiar with the

operation of the devices and technologies described in

this documentation.

They are commissioning specialists or are employed in

the service department and have completed training that

qualifies them for the repair of the system. In addition,

they are authorized to put into operation, to ground, and

to mark circuits and devices according to the safety

engineering standards.

All work with this product must be carried out by qualified

persons!

1.3 Intended use

The device is intended for converting the physical parameter of

pressure into an electric signal. It has to be used only for this

purpose, considering the following information.

The above listed pressure transmitters have, according to the

type, been developed for applications in overpressure and

vacuum as well as for absolute pressure measurement.

Permissible measuring and cleaning media are gases or liquids,

which are compatible with the media wetted parts of the device

(according to data sheet) and your system. This must be

ensured for the application.

This operating manual applies to devices with explosion

protection approval and is intended for the use in IS-areas.

A device has an explosion-protection approval if this was

specified in the purchase order and confirmed in our order

acknowledgement. In addition, the manufacturing label includes

sign.

The user must check whether the device is suited for the

selected use. In case of doubt, please contact our sales

department: [email protected] | phone: +49 7135 102-211.

AFRISO assumes no liability for any wrong selection and the

consequences thereof! The technical data listed in the current

data sheet are engaging and must absolutely be complied with.

1.4 Incorrect use

Danger through incorrect use

- Only use the device in permissible

media and in accordance with its

intended use.

- Do not use the device as a ladder or

WARNING

climbing aid.

- The device must not be altered or

modified in any way.

1.5 Limitation of liability and warranty

Failure to observe the instructions or technical regulations,

improper use and use not as intended, and alteration of or

damage to the device will result in the forfeiture of warranty

and liability claims.

1.6 Safe handling

NOTE -

Do not use any force when installing the device to

prevent damage of the device and the plant!

NOTE -

Treat the device with care both in the packed and

unpacked condition!

NOTE -

Do not throw or drop the device!

NOTE -

Excessive dust accumulation and complete coverage

with dust must be prevented!

NOTE -

The device is state-of-the-art and is operationally

reliable. Residual hazards may originate from the device if it is

used or operated improperly.

1.7 Safety-related maximum values

= 28 V; I

= 93 mA; P

= 660 mW; C

H 0 nF; Li H 0 µH;

= 27 nF;; plus cable inductivities 1 µH/m and

gnd

cable capacities 160 pF/m (for cable by factory)

application in zone 0 (p

0.8 bar up to 1.1 bar): -20 ... 60 °C

atm

application in zone 1:

-40/-20 ... 70 °C

1.8 Scope of delivery

Check that all parts listed in the scope of delivery are included

free of damage, and have been delivered according to your

purchase order:

- pressure transmitter

- this operating manual

2. Product identification

The device can be identified by means of the manufacturing

label with order code. The most important data can be gathered

therefrom.

Fig. 1: Example of manufacturing label

NOTE -

The manufacturing label must not be removed!

The marking for devices with explosion-protection approval has to

include following information:

EU-type examination certificate IBExU11ATEX1054 X

metallic pressure port:

II 1G Ex ia IIC T4 Ga

II 1D Ex ia IIIC T135°C Da

3. Mounting

3.1 Mounting and safety instructions

Danger of death from explosion,

airborne parts, leaking fluid, electric

shock

Always mount the device in a

depressurized and de-energized

DANGER

condition!

Do not install the device while there is

a risk of explosion.

Danger of death from explosion

Explosion hazard due to high-charging

processes in connection with free-

hanging submersible transmitters with

DANGER

cable FEP

Fixed installation of the FEP cable!

NOTE

The technical data listed in the EU-type examination

certificate are binding. Download this by accessing

www.afriso.com or request it by e-mail or phone:

[email protected] | phone: +49 7135 102-211

NOTE

Make sure that the entire interconnection of

intrinsically safe components remains intrinsically safe. The

owner-operator is responsible for the intrinsic safety of the

overall system (entire circuitry).

NOTE

If there is increased risk of damage to the device by

lightning strike or overvoltage, increased lightning protection

must additionally be provided!

NOTE -

Treat any unprotected diaphragm with utmost care;

this can be damaged very easily.

NOTE

- Provide a cooling line when using the device in steam

piping and clarify the material compatibility.

NOTE

- The measuring point must be designed in such a way

that cavitation and pressure surges are avoided.

NOTE

- When installing the device, avoid high mechanical

stresses on the pressure port! This will result in a shift of the

characteristic curve or to damage, in particular in case of very

small pressure ranges and devices with a pressure port made of

plastic.

NOTE -

In hydraulic systems, position the device in such a

way that the pressure port points upward (ventilation).

NOTE

- If the device is installed with the pressure port pointing

upwards, ensure that no liquid drains off on the device. This

could result in humidity and dirt blocking the gauge reference in

the housing and could lead to malfunctions. If necessary, dust

and dirt must be removed from the edge of the screwed joint of

the electrical connection.

NOTE

- Do not remove the packaging or protective caps of the

device until shortly before the mounting procedure, in order to

exclude any damage to the diaphragm and the threads!

Protective caps must be kept! Dispose of the packaging

properly!

NOTE

- The permissible tightening torque depends on the

conditions on site (material and geometry of the mounting point).

The specified tightening torques for the pressure transmitter

must not be exceeded!

NOTES -

for mounting outdoors or in a moist

environment:

- Please note that your application does not show a dew point,

which causes condensation and can damage the pressure

transmitter. There are specially protected pressure

transmitters for these operating conditions. Please contact us

in such case.

- Connect the device electrically straightaway after mounting or

prevent moisture penetration, e.g. by a suitable protective

cap. (The ingress protection specified in the data sheet

applies to the connected device.)

- Select the mounting position such that splashed and

condensed water can drain off. Stationary liquid on sealing

surfaces must be excluded!

- If the device has a cable outlet, the outgoing cable must be

routed downwards. If the cable needs to be routed upwards,

this must be done in an initially downward curve.

- Mount the device such that it is protected from direct solar

radiation. In the most unfavourable case, direct solar radiation

leads to the exceeding of the permissible operating

temperature. This must be excluded if the device is used in

any explosion-hazardous area!

- For devices with gauge reference in the housing (small hole

next to the electrical connection), install the device in such a

way, that the gauge reference is protected from dirt and

moisture. Should the device be exposed to fluid admission,

the functionality will be blocked by the gauge reference. An

exact measurement in this condition is not possible.

Furthermore, this can lead to damages on the device.

3.2 Conditions for oxygen applications

Danger of death from explosion

when used improperly

DANGER

Make sure that your device was ordered for oxygen applications

and delivered accordingly. (see manufacturing label - order code

contains a "1" in position 2)

Unpack the device directly prior to the installation.

Skin contact during unpacking and installation must be avoided

to prevent fatty residues remaining on the device. Wear safety

gloves!

The entire system must meet the requirements of BAM

(DIN 19247)!

For oxygen applications > 25 bar, devices without seals are

recommended.

Transmitters with o-rings of FKM (Vi 567):

permissible maximum values: 25 bar / 150° C (BAM approval)

3.3 Mounting steps for connections according

to EN 837



A suitable seal for the medium and the pressure to be

measured is available. (e.g. a copper seal)



The sealing face of the mating component has a flawless

surface. (R

6.3)

Screw the device into the corresponding thread by hand.

Then tighten it using an open-end wrench. Permissible

tightening torques for pressure transmitter:

G1/4B: approx. 20 Nm; G1/2B: approx. 50 Nm

NOTE

- permitted pressure ranges according to EN 837

G1/4

Counterpart has to be of

p d 600 bar

EN 837

steel according to

DIN 17440 with strength

G1/2

p d 1000 bar

EN 837

e 190 N/mm

p0.2

G1/4

p > 600 bar,

Counterpart has to be of

EN 837

p d 1000 bar

steel according to

G1/2

p > 1000 bar,

DIN 17440 with strength

e 260 N/mm

EN 837

p d 1600 bar

p0.2

NOTE

- Please refer to data sheet or contact sales department

www.afriso.com

regarding max. permitted pressure of device.



3.4 Mounting steps for NPT connections



Suitable fluid-compatible sealing material, e.g. PTFE tape, is

available.

Screw the device into the corresponding thread by hand

Then tighten it using an open-end wrench. Permissible

tightening torques for pressure transmitter:

1/4" NPT: approx. 30 Nm

4. Electrical connection

4.1 Connection and safety instructions

Danger of death from electric shock

or explosion

- Explosion hazard if the operating

voltage is too high (max. 28 V

opening the field housing while an

explosion hazard exists.

Always mount the device in a

depressurized and de-energized

DANGER

condition!

Do not install the device while there is a

risk of explosion.

- Operate the device only within the

specification! (data sheet)



The limit values listed in the EU-type examination certificate

are observed. (Capacity and inductance of the connection

cable are not included in the values.)



The supply corresponds to protection class III (protective

insulation).

NOTE -

If the device is equipped with plug ISO 4400, it must

be ensured that the external diameter of the used cable is within

the permissible clamping range:

cable socket ISO 4400:

Ø 4 ... 6 mm

Moreover you have to ensure that it lies in the cable gland firmly

and cleftlessly!

NOTE -

When devices with plug ISO 4400 are used, the cable

socket must be properly mounted so that the ingress protection

specified in the data sheet is ensured! Ensure that the delivered

seal is placed between plug and cable socket. After connecting

the cable, fasten the cable socket on the device by using the

screw.

NOTE -

for devices with cable outlet

- When routing the cable, following bending radiuses have to

be complied with:

cable without ventilation tube:

static installation:

8-fold cable diameter

dynamic application: 12-fold cable diameter

cable with ventilation tube:

static installation:

10-fold cable diameter

dynamic application: 20-fold cable diameter

- In case of devices with cable outlet and integrated

ventilation tube, the PTFE filter located at the cable end on

the air tube must neither be damaged nor removed! Route

the end of the cable into an area or suitable connection box

which is as dry as possible and free from aggressive gases,

in order to prevent any damage.

- For a clear identification, the intrinsically safe cables are

marked with light blue shrink tubing (over the cable

insulation). If the cable has to be modified (e. g. shortened)

and the marking at the cable end has been lost in the

process, it must be restored (for example, by marking it

again with light blue shrink tubing or an appropriate

identification sign).

NOTE -

Use a shielded and twisted multicore cable for the

electrical connection.

4.2 Conditions for the IS-area

Danger generated by electrostatic charging

Danger of death from explosion

Explosion hazard due to spark

formation from electrostatic charging

of plastic components.

For devices with cable, the cable must

be installed tightly. Generally, a

shielded cable must be used.

DANGER

Do not clean the device and, if

applicable, the connection cable, in a

dry state! Use a moist cloth, for

example.

Overvoltage protection

If the pressure transmitter is used as electrical equipment of

category 1 G, then a suitable overvoltage protection device must

be connected in series (attend the valid regulations for operating

safety as well as EN60079-14).

Schematic circuit

The operation of an intrinsically safe transmitter in intrinsic safe

areas requires special care when selecting the necessary Zener

barrier or transmitter repeater devices to allow the utilization of

the device's properties to the full extent. The following diagram

shows a typical arrangement of power supply, Zener barrier and

transmitter.

transmitter

Zener barrier

IS-area

shielded cable

transmitter

amplifier

Fig. 2 circuit diagrams

NOTE -

Observe item (17) of the type-examination certificate

which specifies special conditions for intrinsically safe operation.

Exemplary circuit description

The supply voltage of e.g. 24 V

provided by the power supply

is led across the Zener barrier. The Zener barrier contains series

resistances and breakdown diodes as protective components.

Subsequently, the operating voltage is applied to the transmitter

and, depending on the pressure, a particular signal current

flows.

Danger of death from explosion

Operation of intrinsically safe devices

as zone-0 equipment only with

ungrounded and galvanically isolated

DANGER

power supply.

Functional selection criteria for Zener barriers and

galvanic power supply

The minimum supply voltage V

of the transmitter must not

S min

fall short since a correct function of the device can otherwise not

be guaranteed. The minimum supply voltage has been defined

in the respective product-specific data sheet under "Output

signal / supply".

When using a galvanically insulated amplifier with linear

bonding, note that the terminal voltage of the transmitter will

decrease like it does with a Zener barrier. Furthermore, you

have to note that the supply will additionally decrease with an

optionally used signal amplifier.

Test criteria for the selection of the Zener barrier

In order not to fall below V

, it is important to verify which

S min

) or by

minimum supply voltage is available at full level control of the

transmitter. The full level control, i.e. a maximum or nominal

output signal (20 mA), can be reached by applying the maximum

physical input signal (pressure).

The technical data of the barrier will usually provide the

information needed for the selection of the Zener barrier.

However, the value can also be calculated. If a maximum signal

current of 0.02 A is assumed, then – according to Ohm's law – a

particular voltage drop will result from the series resistance of

the Zener barrier.

This voltage drop is subtracted by the voltage of the power

supply and as a result, the terminal voltage is obtained which is

applied on the transmitter at full level control. If this voltage is

smaller than the minimum supply voltage, another barrier or a

higher supply voltage should be chosen.

NOTE -

When selecting the ballasts, the maximum operating

conditions according to the EU-type examination certificate must

be observed. When assessing these, refer to their current data

sheets to ensure that the entire interconnection of intrinsically

safe components remains intrinsically safe.

Calculation example for the selection of the Zener

barrier

The nominal voltage of the power supply in front of the Zener

barrier is 24 V

± 5 %. This results in:

- maximum supply voltage:

= 24 V * 1.05 = 25.2 V

Sup max

- minimum supply voltage:

= 24 V * 0.95 = 22.8 V

Sup min

The series resistance of the Zener barrier is listed with 295 Ohm.

The following values must still be calculated:

- voltage drop at the barrier (with full conduction):

= 295 Ohm * 0.02 A = 5.9 V

ab barrier

- terminal voltage at the transmitter with Zener barrier:

= V

– V

= 22.8 V – 5.9 V = 16.9 V

S up min

ab Barriere

- minimum supply voltage of the transmitter

(according to data sheet):

= 12 V

(corresponding to V

Kl min

Condition:

e V

Kl min

Result:

The terminal voltage of the transmitter with Zener barrier lies at

16.9 V and is therefore higher than the minimum supply voltage

of the transmitter which lies at 12 V

barrier has been selected correctly regarding the supply voltage.

NOTE -

Note that no line resistances have been listed in this

calculation. However, these will lead to an additional voltage

drop that must be considered.

power supply

-V

secure area

supply

)

S min

. This means, the Zener