FISCHER DA12 User manual

7.8.07 BA_GB_DA12.fm
1. Safety Instructions
1.1. General
This manual contains detailed
information about the product,
and instructions for its installati-
on, operation and maintenance.
Operators 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 ge-
neral as well as specific safety instructions. Chap-
ters 2 through 10, covering topics ranging from
intended purpose of the equipment to its final dis-
posal, 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 Instruc-
tions
Disregarding safety instructions, use of this pro-
duct for purposes for which it is not intended, and/
or operation of this product outside the limits spe-
cified 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 Regel-
technik GmbH will not be responsible for conse-
quences in such circumstances.
1.4. Safety Instructions for Operators
Safety instructions for the proper use of this pro-
duct must be followed. This information must be
available at all times to by personnel responsible
for installation, operation, maintenance and in-
spection of this product. Adequate steps must be
taken to prevent the occurrence of hazardous con-
ditions that can be caused by electric energy and
the convertible energy of the process media. Such
conditions can, for example, be the result of impro-
per electrical or process connections. Detailed in-
formation is available in relevant published norms
(DIN EN, UVW in Germany; and equivalents in
other countries), industrial standards
such as DVWG, Ex-, GL-, VDE guide-
lines, as well as regulations of the local
authorities (e.g., EVUs in Germany).
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. Supplier Declaration
Instruction Manual
DA12 Differential Pressure Gauge

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1.5. Modifications Forbidden
Modification or other technical alteration of the product is
not permissible. This also applies to the use of unautho-
rized 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 defi-
ned process media. The limiting values of operating pa-
rameters, as given in the product specification sheet,
must never be crossed.
1.7. Safety Considerations during Installation and
Maintenance
The safety instructions given in this manual, existing na-
tional regulations relating to accident prevention, and the
internal safety rules and procedures of the user organi-
zation regarding safety during installation, operation and
servicing must all be followed meticulously.
It is the responsibility of the users to ensure that only sui-
tably qualified and experienced technical personnel are
used for installation, operation and servicing of this
equipment.
2. Intended Applications
This differential pressure measuring instrument is inten-
ded as an indicator for differential pressure measure-
ment. The product must be used only for applications
and under conditions specified by the manufacturer.
Please confer with Fischer Mess- und Regeltechnik prior
to using this transmitter along with polluted or aggressive
media. For use with this media it needs to be adapted in
every part with direct contact to the media.
3. Product Description and Functions
3.1. Block Schematic Diagram
3.2. Principles of Operation
This differential pressure instrument is based on a rug-
ged and uncomplicated diaphragm movement, suitable
for overpressure-, partial vacuum- and differential pres-
sure measurements. Operating principle of system is
identical for all applications of this type.
In a state of balance, forces of springs on both sides of
diaphragm are balanced. Pressure or differential pressu-
re to be measured creates an unbalanced force of
springs for measuring range until a new balance is rea-
ched.
When subjected to excessive pressure, diaphragm rests
on metal supporting plates.
A centre-mounted tappet transfers motion of the dia-
phragm system to indicator movement.
4. Installation
The instrument is intended for wallmounting by default. It
can be mounted immediately by 3 fastening elements ca-
sted on housing. Optional panel mounting with panel
mounting device DZ11 (see 9.). The instrument is factory
calibrated while mounted upright, pressure ports down-
ward. No other mounting orientation is allowed.
To ensure safety during installation and maintenance in-
tegrate adequate shut-off valves. By recommended
accessories (see. 9.) like three- and four-spindle shut-off
and equalizing valves DZ13/14 the instrument can be
• depressurized or shut down,
• cut off a plant to enable controlling or repairing,
• operational checked on site.
4.1. Process connections
• Only qualified technicians authorized for this type of
work should undertake installation.
• Only for intended mechanical process connection (for
model information see Type Plate of instrument).
• Ensure that process equipment and pressure lines
are at atmospheric pressure before making pressure
connections.
• The instrument should be provided with suitable pro-
tection against pressure surges (e.g., snubber or pul-
sation damper).
• Ensure that the mechanical configuration and materi-
als of construction of the instrument are compatible
with the process media.
• Ensure that process pressure is always less than the
specified safe pressure rating.
1. Pressure chamber
2. Movement
3. Tappet
4. Measuring springs
5. Measuring
diaphragm

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5. Commissioning
• Pressure connections to the instrument must be cor-
rectly selected to meet operational requirements, and
installed in a way that does not cause physical stress
to the instrument.
• When used with liquid media the pressure lines must
be vented, for different heights in head of liquid in li-
nes cause measuring errors. The instrument and li-
nes must be protected against frost when used with
water.
• During differential pressure measuring static opera-
ting pressure causes offset of zero point which is in di-
mension of accuracy rating at max operating
pressure. This offset can be corrected by adjustment
of zero point (see 5.3).
• To ensure safety during installation and maintenance
provide adequate shut-off valves.
• Carefully check the pressure-tightness of all pressure
connections before start-up.
5.1. Pressure Connections
The instruments pressure ports are marked by +and −
symbols. The pressure applications need to be installed
according to the label.
Differential pressure measurement:+higher pressure
−lower pressure
Pressure measurement: +pressure port
Negative pressure measurement: −negative pressure
port
5.2. Shock Pressure Moderation
During pulsating pressure on the instrument mechanical
wear and disturbances in functional capability may occur.
To avoid this we recommend installing absorbers into the
pressure lines.
For Liquid Media
For Gaseous Media
5.3. Adjustment of Zero Point
• Charge max. static pressure to pressure chambers.
• Open housing cover.
• Set measurement indicator by zero point adjustment
screw to zero point of scale.
• Mount housing cover.
Location of Zero Point Adjustment Screw
G¼
Adjustable attenuator
valve MZ40
During operating condi-
tion adjust needle valve
that way, that the indi-
cator follows change-
ments of pressure
delayed.
Capilliary Reactive Coil MZ401
Zero point adjustment screw

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6. Maintenance
The instrument is inherently maintenance-free.
However, to ensure reliable operation and maximize the
operating life of instrument, it is recommended that the
instrument, its external electrical and process connec-
tions, and external connected devices be regularly in-
spected, e.g.:
• Check the display.
• Check all pressure connections for leak-tightness.
Inspection and test schedules depend on operating and
site conditions. The operating manuals of other equip-
ment to which the differential pressure transmitter is con-
nected 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 vibra-
tion during transport. It must therefore be properly pak-
ked, 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
9.1. DZ11
Panel mounting kit ø 132 mm consisting of front ring,
spacer and fastening screws.
9.2. DZ13/14
Three- and four-spindle shut-off and equalizing valves
DZ13/14 are especially suited for mounting differential
pressure instruments.
For example they are used for:
• Depressurizing or shutting down of plant.
• Cutting differential pressure instruments off a plant to
enable controlling or repairing.
• Shut-off valves may be used for operational checks
on site.
DZ14 - additional to DZ13 - is provided with a venting val-
ve to ventilate the connected pipe system. Nominal pres-
sure of these shut-off and equalizing valves is PN40.
Case is available in aluminium, brass or stainless steel
1.4301. Several process connections acc. to 13. Orde-
ring Code are available.
10. Disposal
Protect your environment!
Use the product in accordance with re-
levant regulations. Please be aware of
environmental consequences of dispo-
sal at the end of the product's life and
take care accordingly.

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11. Specifications
General
Measuring ranges 0...400 mbar to 0..25 bar (acc. to 13. Ordering Code)
Nominal pressure 25 bar
Max. static operating pressure acc. to measuring range
Max. pressure load one-sided overpressure protected up to nominal pressure
on (+)- and (−)-side of diaphragm, partial vacuum protected
Perm. ambient temperature -10...+70°C (max. 55°C in case of SEV-approval)
Perm. medium temperature 70°C
Protection class IP54 acc. to DIN EN 60529
Linearity ± 2.5 % FS
Zero point adjustment located in the dial
Pressure connection female thread G¼,
cutting ring connection for
6 / 8 / 10 mm tube of brass / zinced steel / chrome-nickel-steel
male connection shank G¼ B DIN EN 837
Measuring system
Range ≤10 bar diaphragm measuring system, diaphragms of reinforced elastomere
Range ≥16 bar diaphragm measuring system, diaphragm of DURATHERM®
Materials
Pressure chamber aluminium Gk Al Si 10 Mg, varnished black
aluminium Gk Al Si 10 Mg surface protected with HART-COAT®
chrome-nickel-steel 1.4305
Measuring diaphragm diaphragm measuring system and gaskets of NBR or Viton®,
diaphragm of DURATHERM®Ni Cr Co-alloy
Materials, media stainless steel 1.4310, 1.4305
Materials, housing macrolon
Weight pressure chamber Al = 1.2 kg, pressure chamber 1.4305 = 3.5 kg
Mounting
Pipe mounting pressure connections V“+", “−" symbols
• by screwed in cutting ring or clamping ring connection
• by screwed in connection shank acc. to DIN EN 837
for nipple fitting acc. to DIN 16284
Wall mounting 3 fastening elements
Panel mounting with front ring, ∅132 mm (see 9.1 DZ11)

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12. Dimensions (all units in mm unless otherwise stated)
DA12 Wall mounting
(Standard version)
Cutting ring
connection
Variants of process connection
Connection G¼ female Connection shank
G¼ male acc. to
DIN EN 837
open open
Measuring
instrument
Ventilation
(only for
DZ14)
Ventilation
Functional
description of
DZ13/14
Cutting ring connection
DZ13/14 Four-spindle shut-off and equalizing valve DZ11 Panel mounting
Panel cut-out

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13. Ordering Code
Differential Pressure Gauge DA12
Measuring Range max. stat. operating pressure
0 . . .400 mbar 6 bar............................................... > 8 3
0 . . . 0.6 bar 10 bar............................................... > 0 1
0 . . . 1 bar 16 bar............................................... > 0 2
0 . . . 1.6 bar 25 bar............................................... > 0 3
0 . . . 2.5 bar 25 bar............................................... > 0 4
0 . . . 4 bar 25 bar............................................... > 0 5
0 . . . 6 bar 25 bar............................................... > 0 6
0 . . . 10 bar 25 bar............................................... > 0 7
0 . . . 16 bar 25 bar............................................... > 0 8
0 . . . 25 bar 25 bar............................................... > 0 9
-0.6. . . 0 bar 10 bar............................................... > 3 0
-1. . . 0 bar 16 bar............................................... > 3 1
-1. . . 0.6 bar 25 bar............................................... > 3 2
-1. . . 1.5 bar 25 bar............................................... > 3 3
-1. . . 3 bar 25 bar............................................... > 3 4
-1. . . 5 bar 25 bar............................................... > 3 5
Measuring Diaphragm / Gaskets
NBR NBR ............................................................... > N
Viton®Viton®.............................................................. > V
DURATHERM®NBR (Range 0-25 bar) .................................... > D
DURATHERM®Viton®(Range 0-25 bar) .................................. > E
Pressure Chamber
Aluminium .................................................................................................> A
Aluminium HART-COAT®.........................................................................> D
Chrome-nickel-steel 1.4305......................................................................> W
Pressure Connections
Female thread G1/4..........................................................................................> 0 1
Connection shank G1/4 B male of brass ..........................................................> 0 6
Connection shank G1/4 B male of stainless steel 1.4305 ................................> 1 1
Cutting ring connection for 6 mm tube of steel ...............................................> 2 0
Cutting ring connection for 8 mm tube of steel ...............................................> 2 1
Cutting ring connection for 10 mm tube of steel ...............................................> 2 2
Cutting ring connection for 6 mm tube of stainless steel 1.4571 ....................> 2 4
Cutting ring connection for 8 mm tube of stainless steel 1.4571 ....................> 2 5
Cutting ring connection for 10 mm tube of stainless steel 1.4571 ....................> 2 6
Cutting ring connection for 6 mm tube of brass ..............................................> 2 8
Cutting ring connection for 8 mm tube of brass ..............................................> 2 9
Cutting ring connection for 10 mm tube of brass ..............................................> 3 0
00

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: [email protected] • www.fischermesstechnik.de
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14. Supplier Declaration