FISCHER DE23 Series Instruction Manual

Instruction Manual

DE23 Differential Pressure Transmitter

Table of Contents

1. Safety Instructions

2. Intended Applications

3. Product Description and Functions

4. Installation

5. Commissioning

6. Maintenance

7. Transport

8. Service

9. Accessories

10. Disposal

11. Specifications

12. Dimensions

13. Ordering Code

14. Declaration of Conformity

8.5.09 BA_GB_DE23.fm 09005097

1. Safety Instructions

1.1. General
This manual contains detailed infor-

mation about the product, and in­structions for its installation,
operation and maintenance. Opera-

tors and other technical personnel responsible for
the equipment must read this thoroughly before at­tempting to install or operate this equipment. A
copy of this manual must always be kept accessi­ble at the place of work for reference by concerned
personnel.

Chapter 1 (sections 1.2 through 1.7) contains ge­neral as well as specific safety instructions. Chap­ters 2 through 10, covering topics ranging from
intended purpose of the equipment to its final dis­posal, also include important points relating to
safety. Overlooking or ignoring any of these safety
points can endanger humans and animals, and
possibly cause damage to other equipment.

1.2. Personnel Qualification
Personnel responsible for installation, operation,
maintenance and inspection of this product must

have the qualifications, training and experience
necessary to carry out such work on this type of
equipment.

1.3. Risks of Disregarding Safety Instruc­tions

Disregarding safety instructions, use of this pro­duct for purposes for which it is not intended, and/
or operation of this product outside the limits spe­cified for any of its technical parameters, can result
in harm to persons, the environment, or the plant
on which it is installed. Fischer Mess- und Regel­technik GmbH will not be responsible for conse­quences in such circumstances.

1.4. Safety Instructions for Operators

Sensor element

Safety instructions for the proper use of this product must
be followed. This information must be available at all
times to by personnel responsible for installation, opera­tion, maintenance and inspection of this product. Ade­quate steps must be taken to prevent the occurrence of
hazardous conditions that can be caused by electric en­ergy and

the convertible energy of the process media. Such con­ditions can, for example, be the result of improper electri­cal or process connections. Detailed information is
available in relevant published norms (DIN EN, UVW in
Germany; and equivalents in other countries), industrial
standards such as DVWG, Ex-, GL-, VDE guidelines, as
well as regulations of the local authorities (e.g., EVUs in
Germany).

1.5. Modifications Forbidden
Modification or other technical alteration of the product is

not permissible. This also applies to the use of unautho­rized spare parts for repair / maintenance of the product.
Any modifications to this product, if and as necessary,
should be done only by Fischer Mess- und Regeltechnik
GmbH.

1.6. Operational Restrictions
The operational reliability of the product is guaranteed
only when used for intended purposes. The product must

be selected and configured for use specifically with defi­ned process media. The limiting values of operating pa­rameters, as given in the product specification sheet,
must never be crossed.

3. Product Descriptions and Functions

3.1. Functional Scheme

3.2. Principles of Operation
The instrument is based on a capacitance sensor ele-

ment and can measure positive gauge, negative gauge
or differential pressure.

The pressure is measured directly by a micromachined
silicon-on-glass differential capacitance sensor element.

Pressure changes cause capacitance changes interpre­ted by the integrated electronics.

4. Installation

The electronic module is mounted on a flat plate or panel,
for which it has 4 holes at the rear for self-tapping screws
∅3.5 mm. A wall-mounting plate is available as an option
(s. 13. Ordering Code).

The pressure transmitters are calibrated at the factory
while mounted vertically, pressure ports downward.
However, they can be mounted in any orientation.

IP65 protection for the housing is guaranteed only if sui­table connecting cable is used.

1.7. Safety Considerations during Installation and
Maintenance

The safety instructions given in this manual, existing na­tional regulations relating to accident prevention, and the
internal safety rules and procedures of the user organi­zation regarding safety during installation, operation and
servicing must all be followed meticulously.

It is the responsibility of the users to ensure that only sui­tably qualified and experienced technical personnel are
used for installation, operation and servicing of this
equipment.

2. Intended Applications

The DE23 is a 2-wire transmitter. It is suitable for accura­te measurement of low positive / negative gauge pressu­re or differential pressure of air and gases.

If the instrument is intended for outdoor application, we
highly recommend using an adequate protective housing
(or at least a big enough shelter) as protection against
UV-radiation on the membrane keyboard and against ex­posure of the instrument to rain or snow.

4.1. Process Connections

• Only technicians who are qualified and authorized for
this type of work should undertake installation.

• Ensure that the process equipment and pressure li­nes are at atmospheric pressure before making pres­sure connections to the instrument.

• The instrument should be provided with suitable pro­tection against pressure surges (e.g., snubber or pul­sation damper).

• Ensure that the mechanical configuration and materi­als of construction of the instrument are compatible
with the process media.

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• Ensure that process pressure is always less than the

2-wire

specified safe pressure rating.

• Carefully check the pressure-tightness of all pressure
connections before start-up.

Do not blow into the pressure

connections!

• Pressure lines must be kept as short as possible and
must not have short bends to avoid measurement er­rors induced by pressure line delays.

5.1. Pressure Connections

The instruments pressure ports are marked by "+" and "-"
symbols. For differential pressure applications the "+"
port must be connected to the higher pressure and the "-"
port should be connected to the lower pressure.

4.2. Electrical Connection

• Only technicians who are qualified and authorized for
this type of work should undertake installation.

• Electrical connections must conform to relevant inter­national, national and local regulations and norms re­lating to electrical and instrumentation installations.

• Switch off electrical power to the plant before attemp­ting electrical installation work of any kind.

• Make electrical connections to the instrument through
a suitable fuse.

4.3. Connection Scheme

Nominal supply voltage and the operating supply voltage
range are indicated under 11. Specifications. The maxi­mum output signal loads are indicated under 11. Specifi­cations.

5. Commissioning

• Power supply and pressure lines to the instrument
must be correctly selected to meet operational requi­rements, and installed in way that does not cause
physical stress to the instrument.

• If pressure lines are used to connect the pressure in­strument and the process vessel / pipe, the pressure
lines must have a downward gradient throughout,
from the pressure instrument to the process vessel /
pipe. This is to prevent formation of liquid plugs (for air
/ gas applications). If this continuous downward gra­dient cannot be provided for any reason, then suitable
water separation devices must be inserted in the
pressure lines.

6. Maintenance

The instrument is inherently maintenance-free.

However, to ensure reliable operation and maximize the
operating life of the instrument, it is recommended that
the instrument, its external electrical and process con­nections, and external connected devices be regularly in­spected, e.g.:

• Check all pressure connections for leak-tightness.

• Check the integrity of all electrical connections of the
instruments.

Inspection and test schedules depend on operating and
site conditions. The operating manuals of other equip­ment to which the level transmitter is connected must be
read thoroughly to ensure that all of them work correctly
when connected together.

7. Transport

The product must be protected against shock and vibra­tion during transport. It must therefore be properly pak­ked, preferably in the original factory packaging,
whenever it is to be transported.

8. Service

Any defective devices or devices with missing parts
should be retourned to Fischer Mess- und Regeltechnik
GmbH. For quick service contact our service department.

Remaining medium in and on dismantled
measuring instruments may cause danger
to persons, environment and equipment.
Take reasonable precautions! Clean the

instrument thoroughly if necessary.

9. Accessories

• Wall mounting set (s. 13. Ordering Code)

• M12 connector plug with cable (s. 13. Ordering Code)

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10. Disposal

Protect your environment!
Use the product in accordance with relevant regulations. Please be aware of environmental conse­quences of disposal at the end of the product's life, and take care accordingly.

11. Specifications

General

Base mea-

suring range

Max. static

operating

pressure

Max. safe

pressure

Straight line

error (max.)°

Repeatability° %FS 0.1

TC span and

offset

max.°°

° Straight-line error = nonlinearity + hysteresis; at 25 °C
°° Compensated temperature range 4 to 50 °C.

Operating temp. (ambient)

Operating temp. (media)

Protection class housing

Pa 0-25 0-50 0-100 0-250 0-500 0-1000 - 25...+ 25 - 50...+ 50 - 100...+ 100

bar 0.7

bar 1.7

%FS 1.0

%FS

10K

Storage temperature

-10 ... 70°C

-10 ... 70°C

-20 ... 70°C
IP 65 acc. to DIN EN 60529

0.6

Nominal supply voltage

Operating supply voltage

Output signal

Output signal

Materials, media contact

load impedance

Electrical connection 1 round-shell connector M12 (5 pin, male)

Pressure connections Screw clamp connectors (aluminum) for 6/4 mm or 8/6 mm tube

Materials, housing

Electrical
24 V DC

12 ... 36 V DC
4 ... 20 mA 2-wire

≤ (UB - 12 V) / 0.02 A

R

L

Connections, Materials, Mounting

Polyamide PA 6,6
Silicon, PVC, aluminium, brass

Mounting Rear mounting holes for back-panel mounting

Wall mounted with mounting plate
If the instrument is intended for outdoor application, we highly recommend using an adequate
protective housing (or at least a big enough shelter) as protection against UV-radiation on the
membrane keyboard and against exposure of the instrument to rain or snow.

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12. Dimensions (all units in mm unless otherwise stated)

wall mounting plate
(optional)

M12 connection

plug

3.5 Ø holes for

self tapping screws

Screw clamp connectors

for 6 or 8 mm tube

Rear view

without wall mounting plate

(standard)

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13. Ordering Code

#

##M9B

#

Differential Pressure Transmitter DE23

Range

0 . . . . 25 Pa..........................................................> D 1

0 . . . . 50 Pa..........................................................> J 6

0 . . . 100 Pa..........................................................> D 4

0 . . . 250 Pa..........................................................> D 6

0 . . . 500 Pa..........................................................> J 7

0 . . 1000 Pa..........................................................> D 9

- 25.0 . . . + 25.0 Pa ..................................................> L 5

- 50.0 . . . + 50.0 Pa ..................................................> L 2

- 100.0 . . . + 100.0 Pa ...................................................> L 7

Pressure Connection

Screw clamp connectors (aluminum) for 6/4 mm tube.................................. > 4 0

Screw clamp connectors (aluminum) for 8/6 mm tube.................................. > 4 1

Electrical Output Signal

4 - 20 mA linear, 2-wire .................................................................................................> B

Power Supply

24 V DC................................................................................................................................ > 9

Electrical Connection

M12 connection.............................................................................................................................................> M

Mounting

Standard (rear mounting holes).............................................................................................................................> 0

Mounting rail..........................................................................................................................................................> S

Wall mounting plate...............................................................................................................................................> W

Accessories

Ordering Code Description Pin Length

06401995 M12 connector plug with cable 5 pin 2 m

06401996 M12 connector plug with cable 5 pin 5 m

04005144 Wall mounting set

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14. Declaration of Conformity

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Technische Änderungen vorbehalten • Subject to change without notice • Changements techniques sous réserve

Fischer Mess- und Regeltechnik GmbH • Bielefelder Str. 37a • D-32107 Bad Salzuflen • Tel. [phone] • Fax [phone]

eMail: [e-mail] • www.fischermesstechnik.de

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