FISCHER DA01 User manual

10.3.08 BA_GB_DA01.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.
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
Instruction Manual
DA01 Differential Pressure Gauge

2
1.4. Safety Instructions for Operators
Safety instructions for the proper use of this product must
be followed. This information must be available at all
times to personnel responsible for installation, operation,
maintenance and inspection of this product. Adequate
steps must be taken to prevent the occurrence of hazar-
dous 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 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
The DA01 is used for indication and switching differential
pressure of gaseous and liquid media. The product must
be used only for applications and under conditions spe-
cified by the manufacturer.
3. Product Description and Functions
3.1. Schematic Diagram
3.2. Principles of Operation
The pressures to be compared act on flexible stainless
steel diaphragms on either side of the sensing capsule.
The two diaphragms are mechanically linked by a rigid
connecting rod. To compensate high static pressures,
the cavity between the two diaphragms is filled with hy-
draulic fluid. When pressures are equal on both dia-
phragms, they are at zero position. When there is a
difference in pressures acting on the two diaphragms,
they are deflected away from the high pressure side, to-
wards the lower pressure side, causing a displacement
of the connecting rod. A precision mechanism translates
the linear displacement of the diaphragm connecting rod
to angular movement of the gauge's dial pointer. The
pointer's displacement range of 270° corresponds to the
full scale differential pressure.
The connecting rod has intermediate flanges on either si-
de, which protects the diaphragms against excess diffe-
rential pressure. When differential pressure exceeds the
specified limit, the flange towards the lower pressure side
is pressed against the sealing O-ring on the inside of the
sensing capsule. This action isolates the fluid adjacent to
the diaphragm exposed to lower pressure, from the fluid
at higher pressure on the other side. This limits the pres-
sure differential across the lower pressure diaphragm,
and equalizes the pressure across the higher pressure
diaphragm. Thus both diaphragms are protected against
excess deflection and risks of rupturing.
1 Connecting rod
2 O-ring, differential over-
pressure protection
3 Sensing diaphragm
4 Pointer mechanism
5 Lever
6 Link
7 Pressure transfer liquid

3
4. Installation
The instrument is intended for plate mounting. There are
2 boreholes (M8) on the rear to fix the instrument on the
mounting plate.
The instrument is intended and factory adjusted for verti-
cal mounting, pressure ports downward. When mounted
in other orientation the pointers’ zero position needs to
be adjusted (see 5.2).
Types with inbuilt limit switches need matching connec-
tion to fixed cable connection to guarantee protection
class IP65. Its outer diameter needs to be between 7 and
13 mm.
4.1. Process Connection
• Only qualified technicians authorized for this type of
work should undertake installation.
• 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.
4.2. Electrical Connection
• Only qualified technicians authorized for this type of
work should undertake installation.
• Electrical connections must comply with relevant in-
ternational, national and local regulations and norms
relating to electrical and instrumentation installations.
• Switch off electrical power to the plant before attemp-
ting electrical installation work of any kind.
• Make electrical connections to the instrument through
a suitable energy-limiting safety device (isolation or
zener barrier).
5. Commissioning
• Power supply, pressure lines and signal cabling to the
instrument must be correctly selected to meet opera-
tional requirements, and installed in a way that does
not cause physical stress to the instrument.
• Pressure lines must have a downward gradient throu-
ghout from the pressure instrument to the process
vessel / pipe. This is to prevent formation of air / gas
pockets (for liquid applications) and liquid plugs (for
air / gas applications). If this continuous downward
gradient cannot be provided for any reason, then sui-
table water and / or air separation devices must be in-
serted into the pressure lines.
• Pressure lines must be kept as short as possible and
must not have short bends to avoid measurement er-
rors induced by pressure line delays.
• 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.
• Carefully check the tightness of all pressure connec-
tions before start-up.
5.1. Pressure Connection
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.
5.2. Zero Point Adjustment
The differential pressure gauge is factory adjusted there-
fore in normal case adjustment during installation is not
necessary.
• Equalize pressure in both chambers.
• Unmount screw plug.
• Use zero point adjustment screw to set the pointer to
zero.
• Mount screw plug.
5.2.1. Zero Point Adjustment Screw Position
5.2.2. Zero Point Adjustment Screw Position
(Filled Models)
Filled Models need to be vented before
commissioning by opening the air val-
ve on the upper side of instrument!
Screw plug
Sealing disc
Zero point adjustment screw
Nullpunkt-
Dichtscheibe
Verschlussschraube
Korrekturschraube
Screw plug
Sealing disc
Zero point
adjustment screw

4
5.3. Setting of Switching Points
An adjustment lock is located in the instruments sight
glass. The switching contacts located on the setpoint va-
lue indicators can be adjusted to any point of scale by the
removable adjustment key.
For reasons of switching accuracy and products life span
switching points should be within range of 10% to 90% of
scale.
Adjustment Sequence:
• Attach adjustment key on axle of adjustment lock.
• Press axle inwards until the actuating arm interlocks
with the actuating pins.
• Turn adjustment key until setpoint value pointer rea-
ches the desired switching point.
• Release axle and remove adjustment key.
5.4. Connection Scheme / Contact Function
See connection scheme on instrument and datasheet Li-
mit Transducer KE... .
Contact Function:
Function 1: Contact closes when the pointer increments
clockwise.
Function 2: Contact opens when the pointer increments
clockwise.
Contact Assignment:
Contact 1 - setpoint value pointer on the left
Contact 2 - setpoint value pointer in the middle
Contact 3 - setpoint value pointer on the right
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 con-
nections and external connected devices be regularly in-
spected, e.g.:
• Check the display.
• 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 equip-
ment to which the instrument 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 vibra-
tion during transport. It must therefore be properly pack-
ed, preferably in the original factory packaging,
whenever it is to be transported.
8. Service
Any defective devices or devices with missing parts
should be returned 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
N.A.
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.
Verstellschloss
Mitnehmerarm
Mitnehmerstift
Sollwertzeiger
Verstellschlüssel
Achse
Setpoint value
pointer
Actuating arm
Adjustment lock
Axle
Adjustment key
Actuating pin

5
11. Specifications
General
Range See Ordering Code
Max. pressure load Overpressure safe up to max. operating pressure
Max. static operating pressure PN 250; PN 400 (see Ordering Code)
Indication Circular dial type 100 or 160 diameter
Scale design acc. to DIN, 270°
Accuracy ± 1.6% FS
Perm. ambient temperature
(housing)
-20 ... +80°C
Perm. medium temperature -20 ... +80°C
Zero adjustment Accessible through marginal openings of the housing, max. ±30% FS
Pressure connection Flange connection acc. to DIN EN 61518, female thread G1/2
Pressure chamber Plain walls without undercuts, even measuring diaphragm;
Rinsing and venting connection G1/8
Protection class IP54 acc. to DIN EN 60529
IP65 acc. to DIN EN 60529 for filled models
Materials, Mounting
Pressure chamber 1.4404
Measuring diaphragm For ranges ≤400 mbar: 1.4571 stainless steel
For ranges ≥0.6 bar: NiCrCo alloy (Duratherm®)
Pressure transfer liquid Silicone oil
Inner plate AlMgSiPb HART-COAT®
Indicator and housing 1.4301 stainless steel
Gasktes Viton®O-Rings
Glass Multi layer laminated safety glass
Dial and Indicator Aluminium
Mounting Pressure acc. to indicated symbols
Wallmounting by mounting plate

6
12. Dimensions (all units in mm unless otherwise stated)
Rinsing connection G1/8 female
Rinsing connection G1/8 female
Differential Pressure Gauge DA01 Model: Range (60 ... 400) mbar
Differential Pressure Gauge DA01 Model: Range (0.6 ... 25) bar

7
13. Ordering Code
Differential Pressure Gauge DA01
Range
0 . . . 60 mbar..............................................................................> 5 8
0 . . . 100 mbar..............................................................................> 5 9
0 . . . 160 mbar..............................................................................> 6 0
0 . . . 250 mbar..............................................................................> 8 2
0 . . . 400 mbar..............................................................................> 8 3
0 . . . 0.6 bar..............................................................................> 0 1
0 . . . 1 bar..............................................................................> 0 2
0 . . . 1.6 bar..............................................................................> 0 3
0 . . . 2.5 bar..............................................................................> 0 4
0 . . . 4 bar..............................................................................> 0 5
0 . . . 6 bar..............................................................................> 0 6
0 . . . 10 bar..............................................................................> 0 7
0 . . . 16 bar..............................................................................> 0 8
0 . . . 25 bar..............................................................................> 0 9
0 . . . 40 kPa..............................................................................> E 8
0 . . . 100 kPa..............................................................................> F 2
0 . . . 250 kPa..............................................................................> F 4
0 . . . 600 kPa..............................................................................> F 6
0 . . 1000 kPa..............................................................................> F 7
0 . . 1600 kPa..............................................................................> F 8
0 . . . 10 PSI.................................................................................> H 3
0 . . . 15 PSI.................................................................................> H 4
0 . . . 30 PSI.................................................................................> H 5
Other ranges on request...............................................................> 9 9
Nominal Pressure Rating
PN 250............................................................................................................> N
PN 400 (only for ranges ≥0.6 bar) ................................................................> P
Measuring System Material
Pressure chamber chrome-nickel-steel 1.4404 / AISI 316L/ standard diaphragm . > R
Hastelloy *) ........................................................................................................... > H
Pressure Connection
Flange connection acc. to DIN EN 61518 with G1/2 (F).................................................. > 0 3
Threaded connectors 1/4-18 NPT (F).............................................................................. > 0 4
Threaded connectors 1/2-14 NPT (F).............................................................................. > 0 5
Threaded connectors G1/2 (M) stainless steel.............................................................. > 1 3
Threaded connectors 1/4-18 NPT EXT (M) stainless steel ............................................ > 1 4
Threaded connectors 1/2-14 NPT EXT (M) stainless steel ............................................ > 1 5
Dial Size
Bayonet ring case ø100 (Range 0.6 up to 25 bar) 1.4301 stainless steel ......................................... > L
Bayonet ring case ø160, 1.4301 stainless steel ................................................................................ > M
Mounting
Pipe mounting (only for bar ranges) ........................................................................................................... > R
Wall mounting (standard)........................................................................................................................... > W
Panel mounting set (only for bar ranges / without additional superstructural parts) .......................... > T
Front cover ring for panel mounting............................................................................................................ > G
Liquid Filling
Without liquid filling.............................................................................................................................................. > 0
Dial with liquid filling: glycerine ............................................................................................................................ > 1
Dial with liquid filling with inbuilt contacts (Napvis) *) .......................................................................................... > 2
Dial with liquid filling: silicone oil .......................................................................................................................... > 5
Additional Pointer
Without additional pointer ............................................................................................................................................. > 0
Adjustable reference pointer.........................................................................................................................................> 1
Contacts / Transmitter
Without contacts / transmitter*) .............................................................................................................................................> 0
Built-in limit switches, per Data Sheet KE... (ranges ≥100 mbar) *)**).................................................................................> 1
Built-in pointer position transducer, per Data Sheet KE... (ranges ≥100 mbar) *)**)............................................................> 2
*) Shaded marks are not indicated in the data sheet and only available on request!
**) Built-in contacts and pointer position transducer only on request and technical clarification!
0

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
8
14. Declaration of Conformity