WIKA PGT23.063, PGT43.100, APGT43.100, PGT63HP.100, PGT23.100 Operating Instructions Manual
...
Operating instructions
Betriebsanleitung
Pressure gauges with output signal,
optional for hazardous areas
Manometer mit Ausgangssignal,
optional für explosionsgefährdete Bereiche
Examples for pressure gauges with output signal
Model PGT23.063
Model PGT23.100 Model PGT43.100
EN
DE
Model PGT63HP.100
Model APGT43.100
Model DPGT43HP.100
Model DPGT43.100
Operating instructions for pressure gauges with
EN
output signal, optional for hazardous areas
Page 3 - 32
Betriebsanleitung für Manometer mit Ausgangssi-
DE
gnal, optional für explosionsgefährdete Bereiche
© 07/2019 WIKA Alexander Wiegand SE & Co. KG
All rights reserved. / Alle Rechte vorbehalten.
®
WIKA
is a registered trademark in various countries.
®
WIKA
ist eine geschützte Marke in verschiedenen Ländern.
Prior to starting any work, read the operating instructions!
Keep for later use!
Vor Beginn aller Arbeiten Betriebsanleitung lesen!
Zum späteren Gebrauch aufbewahren!
Seite 33 - 63
2
Pressure gauges with output signal, optional for hazardous areas
11297264.05 07/2019 EN/DE
Contents
Contents
1. General information 4
2. Design and function 5
2.1 Overview . . . . . . . . . . . . . . . . . . . . . . . 5
2.2 Description. . . . . . . . . . . . . . . . . . . . . . . 5
2.3 Scope of delivery . . . . . . . . . . . . . . . . . . . . 5
3. Safety 6
3.1 Explanation of symbols . . . . . . . . . . . . . . . . . . 6
3.2 Intended use . . . . . . . . . . . . . . . . . . . . . . 6
3.3 Improper use . . . . . . . . . . . . . . . . . . . . . . 7
3.4 Responsibility of the operator . . . . . . . . . . . . . . . . 7
3.5 Personnel qualification. . . . . . . . . . . . . . . . . . . 8
3.6 Skilled personnel . . . . . . . . . . . . . . . . . . . . 8
3.7 Labelling, safety marks . . . . . . . . . . . . . . . . . . 8
3.8 Ex marking (option) . . . . . . . . . . . . . . . . . . . .10
3.9 Specifications and temperature limits. . . . . . . . . . . . . .10
3.10 Special conditions for safe use (X conditions) . . . . . . . . . . .12
4. Transport, packaging and storage 13
4.1 Transport . . . . . . . . . . . . . . . . . . . . . . .13
4.2 Packaging and storage . . . . . . . . . . . . . . . . . .13
5. Commissioning, operation 14
5.1 Mechanical connection . . . . . . . . . . . . . . . . . .14
5.2 Electrical connection . . . . . . . . . . . . . . . . . . .17
5.3 Zero point setting (not for PGT23.063) . . . . . . . . . . . . .19
5.4 Commissioning . . . . . . . . . . . . . . . . . . . . .20
6. Faults 21
7. Maintenance and cleaning 22
7.1 Maintenance . . . . . . . . . . . . . . . . . . . . . .22
7.2 Cleaning . . . . . . . . . . . . . . . . . . . . . . .23
8. Dismounting, return and disposal 24
8.1 Dismounting . . . . . . . . . . . . . . . . . . . . . .24
8.2 Return . . . . . . . . . . . . . . . . . . . . . . . .24
8.3 Disposal . . . . . . . . . . . . . . . . . . . . . . .25
9. Specications 26
9.1 Electrical connection . . . . . . . . . . . . . . . . . . .26
9.2 Transmitter electronics for non-hazardous areas . . . . . . . . . .27
9.3 Transmitter electronics for hazardous areas . . . . . . . . . . .27
9.4 Pressure gauges with output signal . . . . . . . . . . . . . .28
Annex: EU declaration of conformity 63
EN
Declarations of conformity can be found online at www.wika.com.
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3Pressure gauges with output signal, optionally for hazardous areas
1. General information
1. General information
The contact pressure gauge described in the operating instructions has been designed
and manufactured using state-of-the-art technology. All components are subject to stringent quality and environmental criteria during production. Our management systems are
EN
certied to ISO 9001 and ISO 14001.
These operating instructions contain important information on handling the instrument.
Working safely requires that all safety instructions and work instructions are observed.
Observe the relevant local accident prevention regulations and general safety regulations
for the instrument's range of use.
The operating instructions are part of the product and must be kept in the immediate
vicinity of the instrument and readily accessible to skilled personnel at any time.
Skilled personnel must have carefully read and understood the operating instructions
prior to beginning any work.
The manufacturer's liability is void in the case of any damage caused by using the
product contrary to its intended use, non-compliance with these operating instructions,
assignment of insuciently qualied skilled personnel or unauthorised modications to
the instrument.
The general terms and conditions contained in the sales documentation shall apply.
Subject to technical modications.
Further information:
- Internet address: www.wika.de / www.wika.com
Model Transmitter electronics
for non-hazardous areas
Model Variant
PGT23.063 891.44 1, 3, 4 - - PV 12.03
PGT23.1x0, PGT26.1x0 891.44 1, 3, 4 892.44 2 PV 12.04
PGT43 891.44 1, 3, 4 892.44 2 PV 14.03
PGT43HP 891.44 1, 3, 4 892.44 2 PV 14.07
PGT63HP 891.44 1, 3, 4 892.44 2 PV 16.06
APGT43 891.44 1, 3, 4 892.44 2 PV 15.02
DPGT43 891.44 1, 3, 4 892.44 2 PV 17.05
DPGT43HP 891.44 1, 3, 4 892.44 2 PV 17.13
1) Variant of the output signal
1: 4 … 20 mA, 2-wire, passive, per NAMUR NE 43
2: 4 ... 20 mA, 2-wire, for hazardous areas
3: 0 ... 20 mA, 3-wire
4: 0 ... 10 V, 3-wire
Transmitter electronics
for hazardous areas
1)
Model Variant
For instruments which are additionally tted with switch contact(s), the following operating instructions also apply:
- “Pressure gauges with inductive contact model 831, for hazardous areas”,
article number 14320154
- “Pressure gauges with switch contact model 821, 851 or 830 E”,
article number 14057651
Pressure gauges with output signal, optionally for hazardous areas4
Data
sheet
1)
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2. Design and function
2. Design and function
2.1 Overview
Example model PGT23.100, version “S3” per EN 837
Pressure element
Movement
Transmitter electronics
Pressure compensating valve
Electrical connection with cable box
Laminated safety glass
Process connection
EN
2.2 Description
For the instruments described, because of their robustness and ease of use, Bourdon tube,
diaphragm, capsule and corrugated steel measuring elements are widely used. Under the
inuence of pressure, the pressure elements deform within their elastic limits. A mechanical
movement transfers this deformation into a rotational motion. A magnet on the pointer shaft
rotates proportionally to the instrument pointer as a direct linear function of the process
pressure. The angle sensor contained in the transmitter electronics measures the rotational
motion of the magnet in the range 0 ... 270°. The angle change is registered without any
contact and, thus, wear-free and is converted to an analogue output signal via an amplier.
The span of the output signal corresponds to the measuring span on the dial.
Safety version “S3” per EN 837
This version is made up of laminated safety glass, a solid bae wall between measuring
system and dial and a blow-out back. In the event of a failure, the operator is protected at the
front side, as media or components can only be ejected via the back of the case.
Ex version
All instruments, except for the model PGT23.063, are also optionally available in a design for
hazardous areas.
2.3 Scope of delivery
Cross-check scope of delivery with delivery note.
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5Pressure gauges with output signal, optionally for hazardous areas
2. Design and function / 3. Safety
3. Safety
3.1 Explanation of symbols
WARNING!
... indicates a potentially dangerous situation that can result in serious injury or
EN
3.2 Intended use
Pressure gauges with output signal combine a mechanical measuring system with electronic
signal processing and are used to control process values as well as for plant monitoring in
industrial applications. The instrument oers many application possibilities for gaseous and
liquid aggressive media that are not highly viscous or crystallising.
Only use the instrument in applications that lie within its technical performance limits (e.g.
temperature limits, material compatibility, ...).
→ For performance limits see chapter 9 “Specications”.
The instrument has been designed and built solely for the intended use described here, and
may only be used accordingly.
The manufacturer shall not be liable for claims of any type based on operation contrary to
the intended use.
death, if not avoided.
CAUTION!
... indicates a potentially dangerous situation that can result in light injuries or
damage to property or the environment, if not avoided.
DANGER!
... identies hazards caused by electrical power. Should the safety instructions
not be observed, there is a risk of serious or fatal injury.
WARNING!
... indicates a potentially dangerous situation in the hazardous area that results
in serious injury or death, if not avoided.
WARNING!
... indicates a potentially dangerous situation that can result in burns, caused by
hot surfaces or liquids, if not avoided.
Information
... points out useful tips, recommendations and information for ecient and
trouble-free operation.
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3. Safety
3.3 Improper use
WARNING!
Injuries through improper use
Improper use of the instrument can lead to hazardous situations and injuries.
▶
Refrain from unauthorised modications to the instrument.
▶
Do not use the instrument with abrasive or viscous media.
Exceptions are diaphragm pressure gauges (models PGT43 and PGT43HP)
with specially coated diaphragms (abrasive) or versions with open connect-
ing anges (viscous).
Any use beyond or dierent to the intended use is considered as improper use.
3.4 Responsibility of the operator
The instrument is used in the industrial sector. The operator is therefore responsible for legal
obligations regarding safety at work.
The safety instructions within these operating instructions, as well as the safety, accident
prevention and environmental protection regulations for the application area must be
maintained.
The operator is obliged to maintain the product label in a legible condition.
To ensure safe working on the instrument, the operating company must ensure
that suitable rst-aid equipment is available and aid is provided whenever required.
that the operating personnel are regularly instructed in all topics regarding work safety,
rst aid and environmental protection and know the operating instructions and in particular, the safety instructions contained therein.
that the instrument is suitable for the particular application in accordance with its intended
use.
that personal protective equipment is available.
EN
On the wetted parts of the instrument, small residual amounts of the adjustment
medium (e.g. compressed air, water, oil) can adhere from production. With
increased requirements for technical cleanliness, suitability for the application
must be checked by the operator before commissioning.
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7Pressure gauges with output signal, optionally for hazardous areas
3. Safety
3.5 Personnel qualification
WARNING!
Riskofinjuryshouldqualicationbeinsucient!
Improper handling can result in considerable injury and damage to equipment.
The activities described in these operating instructions may only be carried out
EN
3.6 Skilled personnel
Skilled personnel are understood to be personnel who, based on their technical training,
knowledge of measurement and control technology and on their experience and knowledge
of country-specic regulations, current standards and directives, are capable of carrying out
the work described and independently recognising potential hazards.
3.7 Labelling, safety marks
Product label Non-Ex version (example PGT23.063)
by skilled personnel who have the qualications described below.
Instrument type
Model + transmitter electronics
Scale range
Output signal
Supply voltage
Case lling
Article number
Date of manufacture (month/year)
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3. Safety
Product label Ex version (example)
Model + transmitter electronics
Article number
Serial number
Date of manufacture (month/year)
Ex marking
Risk of burns!
Potentially dangerous situation caused by hot surfaces.
The instrument bearing this mark is a safety pressure gauge with a solid bae
wall in accordance with EN 837, safety version “S3”.
Do not dispose of with household waste. Ensure a proper disposal in accordance with national regulations.
Case lling
Supply voltage
Output signal
Scale range
Before mounting and commissioning the instrument, ensure you read the
operating instructions!
EN
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9Pressure gauges with output signal, optionally for hazardous areas
3. Safety
3.8 Ex marking (option)
DANGER!
Danger to life due to loss of explosion protection
Non-observance of these instructions and their contents may result in the loss of
explosion protection.
EN
Check whether the classication is suitable for the application. Observe the relevant national
regulations.
Instruments without PTFE lining
ATEX
II 2G Ex ia IIC T6/T5/T4 Gb
II 2D Ex ia IIIB T85°C /T100°C/T135°C Db
Instruments with PTFE lining
Option with models: PGT43, PGT43HP
ATEX
II 2G Ex ia IIB T6/T5/T4 Gb
▶
Observe the safety instructions in this chapter and further explosion protection instructions in these operating instructions.
▶
Observe the information given in the applicable type examination certicate and the relevant country-specic regulations for installation and use in
hazardous areas (e.g. IEC 60079-14, NEC, CEC).
IECEx
IECEx
3.9 Specifications and temperature limits
Ingress protection per IEC/EN 60529
For information on the ingress protection of the respective instrument, see chapter 9 “Speci-
cations”. For the IECEx assessment, IP20 ingress protection was assumed.
Permissible temperature range
For determining the maximum temperature at the instrument, besides the medium
temperature also other inuences such as the ambient temperature and, if applicable, the
solar irradiation must be taken into account.
Gas hazardous areas
Required temperature class
(ignition temperature)
T6 -20 ... +45 °C
T5 -20 ... +60 °C
T4 ... T1 -20 ... +60 °C, (+70 °C optional)
Permissible temperature range at the instrument
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3. Safety
T-Ref
T-Ref
Dust hazardous areas
Maximum surface temperature Permissible temperature range at the instru-
ment
T85°C -20 ... +45 °C
T100°C -20 ... +60 °C
T135°C -20 ... +60 °C, (+70 °C optional)
The installation should be made in such a way that the temperature range of the instrument,
also considering the eects of convection and thermal radiation, neither exceeds nor falls
below the permissible limits.
The permissible temperature ranges must not be exceeded at the instrument either. If necessary, measures for cooling (e.g. syphon, instrumentation valve) have to be taken.
Pressure gauge Dierential pressure gauge
EN
Compliance with the permissible temperature range during operation must be ensured by
the operator by means of temperature measurement(s) at “T-Ref” within the shown hatched
area(s).
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11Pressure gauges with output signal, optionally for hazardous areas
3. Safety
3.10 Special conditions for safe use (X conditions)
i. The temperature class and permitted maximum ambient temperature, are dependent
upon the options tted within the equipment and may not be marked on the equipment
label. The user shall refer to this certicate and to the equipment instructions for details of
the applicable temperature class and ambient temperature range.
ii. The user shall consider that heat may be transferred along the measurement probe and
EN
the equipment shall not exceed the maximum permitted ambient temperature. For further
information, refer to the user instructions.
iii. Models which incorporate a PTFE lining may be marked for use in Group IIB only. The
user shall ensure that such models marked as such are not used in Group IIC Gas nor
Group III dust hazardous areas.
iv. Models which incorporate a PTFE lining may be marked for use in Group IIC gas and
Group IIIB dust hazardous area. Such models also incorporate a warning label advising
the user of a potential electro-static hazard within the process connection area. The user
shall take all necessary precautions to mitigate the risk of electro-static discharge within
the process connection.
v. The equipment may incorporate an integral cable. The user shall ensure that, when
installed, the cable is xed in place and is protected from mechanical damage.
vi. For Group III applications, under certain extreme circumstances, the non-metallic coating
of the enclosure of this equipment may generate an ignition-capable level of electrostatic
charge. Therefore, the equipment shall not be installed in a location where the external
conditions are conducive to the build-up of electrostatic charge on such surfaces. The
user/installer shall implement precautions to prevent the build-up of electrostatic charge,
e.g. locate the equipment where a charge-generating mechanism (such as wind-blown
dust) is unlikely to be present and clean with a damp cloth.
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4. Transport, packaging
4. Transport, packaging and storage
4.1 Transport
Check the instrument for any damage that may have been caused by transport.
Obvious damage must be reported immediately.
CAUTION!
Damage through improper transport
With improper transport, a high level of damage to property can occur.
▶
When unloading packed goods upon delivery as well as during internal transport, proceed carefully and observe the symbols on the packaging.
▶
With internal transport, observe the instructions in chapter 4.2 “Packaging
and storage”.
4.2 Packaging and storage
Do not remove packaging until just before mounting.
Keep the packaging as it will provide optimum protection during transport (e.g. change in
installation site, sending for repair).
Permissible conditions at the place of storage:
Storage temperature: -20 ... +70 °C
Avoid exposure to the following factors:
Direct sunlight or proximity to hot objects
Mechanical vibration, mechanical shock (putting it down hard)
Soot, vapour, dust and corrosive gases
Hazardous environments, ammable atmospheres
EN
Store the instrument in its original packaging in a location that fulls the conditions listed
above.
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13Pressure gauges with output signal, optionally for hazardous areas
5. Commissioning, operation
5. Commissioning, operation
Personnel: Skilled personnel
Before installation, commissioning and operation, ensure that the appropriate instrument has
been selected in terms of scale range, design and specic measuring conditions.
EN
WARNING!
Physical injuries and damage to property and the environment caused by
hazardous media
Upon contact with hazardous media (e.g. with ammable or toxic substances),
harmful media (e.g. corrosive, toxic, carcinogenic, radioactive), there is a danger of
physical injuries and damage to property and the environment.
Should a failure occur, aggressive media with extremely high temperature and
under high pressure may be present at the instrument.
▶
For these media, in addition to all standard regulations, the appropriate existing codes or regulations must also be followed.
▶
Wear the requisite protective equipment.
WARNING!
Physical injuries and damage to property and the environment caused by
media escaping under high pressure
With the pressurisation of the instrument, as a result of poor sealing of the
process connection, media under high pressure can escape.
Due to the high energy of the media that can escape in the event of a failure, the
possibility of physical injuries and damage to property exists.
▶
The sealing of the process connection must be carried out expertly and
checked for leak tightness.
5.1 Mechanical connection
In accordance with the general technical regulations for pressure gauges (e.g. EN 837-2
“Selection and installation recommendations for pressure gauges”).
When screwing the instruments in, the force required for sealing must not be applied through
the case, but only through the spanner ats provided for this purpose, and using a suitable
tool.
Installation with open-ended
spanner
For parallel threads, use at gaskets, lens-type sealing rings or WIKA prole sealings at the
sealing face . With tapered threads (e.g. NPT threads), sealing is made in the threads ,
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5. Commissioning, operation
using a suitable sealing material (EN 837-2).
The tightening torque depends on the sealing used. In order to orientate the measuring
instrument so that it can be read as well as possible, a connection with LH-RH union or
union nut should be used. When a blow-out device is tted to an instrument, it must be
protected against being blocked by debris and dirt.
Spanner ats
Sealing face
Installation
Nominal position per EN 837-3 / 9.6.6 gure 7: 90° ( ⊥ )
Process connection lower mount
With lled versions the vent valve at the top of the case must be opened before commis-
sioning!
For outdoor applications, the selected installation location has to be suitable for the
specied ingress protection, so that the instrument is not exposed to impermissible
weather conditions.
In order to avoid any additional heating, the instruments must not be exposed to direct
solar irradiation while in operation!
To ensure that the pressure can be safely vented in the case of failure, due to the
blow-out back, a minimum distance of 20 mm from any object must be maintained.
Sealing in the thread
EN
Requirements for the installation point
If the line to the measuring instrument is not adequately stable, an instrument mounting
bracket should be used for fastening. If vibrations cannot be avoided by means of suitable
installation, lled instruments should be used. The instruments should be protected against
coarse dirt and wide uctuations in ambient temperature.
Permissible vibration load at the installation site
The instruments should always be installed in locations free from vibration. If necessary,
it is possible to isolate the instrument from the mounting point, e.g. by installing a exible
connection line between the measuring point and the instrument and mounting the instrument on a suitable bracket.
If this is not possible, the following limit values must not be exceeded:
Frequency range < 150 Hz
Acceleration < 0.5 g (5 m/s
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)
15Pressure gauges with output signal, optionally for hazardous areas
5. Commissioning, operation
Test connection
In specic applications (e.g. steam boilers) the shut-o devices must have a test connection,
so that the instrument can be tested without being dismounted.
Temperature load
The installation of the instrument should be made in such a way that the permissible operat-
EN
ing temperature, also considering the eects of convection and thermal radiation, neither
exceeds nor falls below the permissible limits. Thus the instrument and the shut-o device
must be protected by suciently long measuring lines or syphons.
The inuence of temperature on the indication and measurement accuracy must be
observed.
WARNING!
The actual maximum surface temperature depends not on the equipment itself,
but mainly on the operating conditions. With gaseous substances, the temperature may increase as a result of compression warming. In these cases it may be
necessary to throttle the rate of change of pressure or reduce the permissible
medium temperature.
Commissioning of pressure compensating valve
Instruments which are tted with a pressure compensating valve
must, following installation, be vented for internal pressure compensation.
Tool: Open-ended spanner SW 9
1. Remove plastic cap
2. Loosen the threaded connection above the valve body
3. Screw the valve body tight, turned through 180°, with ≤ 4.5 Nm
Before commissioning
After commissioning
For information on the ingress protection, see Technical information IN 00.18
Protection of the pressure elements from overload
If the medium is subject to rapid changes in pressure, or pressure surges are expected, then
these must not act directly on the pressure element. The action of the pressure surges must
be dampened, for example with the tting of a throttle section (reduction in cross-section in
the pressure port) or through the addition of an adjustable snubber.
Pressure tapping point
The pressure tapping point should be arranged with as large a bore as possible (≥ 6 mm)
via a shut-o device, so that the pressure tap is not distorted by a ow in the medium. The
measuring line between the pressure tapping points and the instrument should have a large
enough internal diameter to prevent blockage and lag in the pressure transmission.
Measuring line
The measuring lines must be as short as possible and should be arranged without sharp
radii in order to avoid any disruptive time lags. When routing these lines, a steady inclination
of approx. 1:15 is recommended.
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5. Commissioning, operation
The measuring line should be designed and installed so that the loads occurring due to
expansion, vibration and thermal eects can be absorbed. With gaseous media, a drain
should be provided at the lowest point; with liquid media, a vent should be provided at the
highest point.
The measuring instruments must be mounted in the common mounting position per EN
837-1, with a max. permissible incline of 5° on all sides.
Measuring assemblies
Proven measuring assemblies for various types of media.
Liquid media Gaseous media
Filling of the
measuring
line
Examples conden-
Pressure
gauge above
the tapping
point
Pressure
gauge below
the tapping
point
liquid liquid with
vapour
boiling liquids “liquid
sate
completely
vapourised
gases”
gaseous partially
condensed
(damp)
dry air moist air
ue gases
completely
condensed
steam
EN
5.2 Electrical connection
The electrical connection must only be made by qualied skilled personnel. The instrument
must be connected to the equipotential bonding of the plant.
→ For performance data see chapter 9 „Specications“
Supply voltage non-Ex version
Suitable supply voltage
Model KFA6-STR-1.24.500, AC 115/230 V, for DIN rail, order number: 7305636
Supply voltage Ex version
The instrument must only be used in conjunction with a corresponding Ex repeater power
supply.
Suitable Ex repeater power supply
Model KFD2-STC4-Ex1, DC 20 ... 35 V, for DIN rail, order number: 2341268
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17Pressure gauges with output signal, optionally for hazardous areas
5. Commissioning, operation
Safety instructions for installation
Install instruments in accordance with the manufacturer's instructions and the valid stand-
ards and regulations.
Only connect circuits with the same voltage and type of protection to the connecting
EN
cables of the instrument.
Size the connecting cables for the largest current strength in the circuits and ensure
sucient UV resistance and mechanical stability.
With exible connecting cables, use isolated end splices. Max. permissible conductor
cross-section 1.5 mm².
Connecting cables must be suited to the ambient temperature range of the application.
The connecting cables must also be suitable for the supplied cable gland (for diameter
range, see below).
Seal the cable entry with the appropriate approved cable glands.
Install the connection cables securely.
Dismounting cable socket
The cable socket is pretted and must be dismantled as described below.
Only use cable with a diameter of
7 ... 13 mm
Screw
Cable cover cap
Cable cover
Socket insert
Cable socket baseplate
Sealings
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5. Commissioning, operation
Fully loosen the screws on the cable cover cap with a slotted screwdriver (0.6 x 3.5 mm)
and remove them.
Pull the cable cover, along with the socket insert, out from the cable socket baseplate
(joined permanently with the instrument).
Take the cable cover cap and push the socket insert out, downwards, completely through
the cable cap.
Pin assignment cable socket
EN
2-wire system
e.g. 4 ... 20 mA
Do not use this
terminal
Supply
voltage
Evaluation
(display)
Terminals 3 and 4: For internal use only
Terminals 5 and 6: Reset zero point
U
+/I+
B
+0V/GND
3-wire system:
e.g. 0 ... 20 mA / 0 ... 10 V
Ground, connect-
Supply
voltage
Evaluation
(display)
ed to case
U
+/I+
B
I
out/Uout
+0V/I-
Terminals 4, 5 and 6:
for internal use only
Pin assignment model PGT23.063
Cable Connector Assignment
red Pin 1 U
black Pin 4 0 V/I-
B
+/I+
brown Pin 2 n.c.
- - - Pin 3 n.c
5.3 Zero point setting (not for PGT23.063)
In most cases, the zero point should only be checked and adjusted after the system has
been depressurised. Instruments whose scale does not start at atmospheric pressure the
pressure gauge must be pressurised with the pressure value of the scale start. With dierential pressure gauges, the setting of the zero point should be made by opening the pressure
equalisation valve under static load.
Slotted screw
Mechanical zero point
If there is a deviation from the zero point (in depressurised
condition), the zero point setting can be carried out via the builtin adjustable pointer. For this, remove the bayonet ring including
the window and the seal from the case.
By turning the slotted screw of the adjustable pointer, a mechanical zero point setting can be carried out.
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5. Commissioning, operation
Electrical zero point
If the mechanical zero point has been altered via the adjustable pointer, the electrical zero
point must be matched to the mechanical one. To do this, apply the pressure value of the
scale start. The scale start corresponds to the smallest electrical signal (depending on the
variant either 0 mA, 4 mA or 0 V).
EN
With a small piece of stranded wire (maximum permissible resistance 30 Ω), stripped at both
ends, bridge terminals 5 and 6 on the socket insert.
Installation cable socket
Connect the socket insert to the cable cover and assemble the cable cover cap with the
sealing and screw (see cable socket drawing).
Insert the assembly, which has just been assembled, onto the cable socket baseplate
with sealing.
Screw the screws on the cable cover cap in fully with a slotted screwdriver (0.6 x 3.5 mm).
In order that the ingress protection is maintained, the seals must be retted.
Store zero point in transmitter electronics
After switching on the supply voltage, within a max. 30 seconds, the new zero point will
be saved in the transmitter electronics. As a check, during this time, a current increase to
9.5 mA can be measured in the current loop on a display unit (e.g. ammeter).
Removing the terminal bridge
Switch o supply voltage and display unit.
Carry out the “Dismounting cable socket” described above.
Remove the stranded wire for bridging terminals 5 and 6 from the socket insert.
Carry out the “Installation cable socket” described above.
The electrical output signal will once more match the display of the mechanical pointer.
Close all valves opened for the zero point setting again.
5.4 Commissioning
Pressure surges must be avoided at all costs, open the shut-o valves slowly.
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6. Faults
6. Faults
DANGER!
Danger to life from explosion
Through working in ammable atmospheres, there is a risk of explosion which
can cause death.
▶
Only rectify faults in non-ammable atmospheres!
CAUTION!
Physical injuries and damage to property and the environment
If faults cannot be eliminated by means of the listed measures, the instrument
must be taken out of operation immediately.
▶
Ensure that pressure or signal is no longer present and protect against
accidental commissioning.
▶
Contact the manufacturer.
▶
If a return is needed, please follow the instructions given in chapter 8.2
“Return”.
WARNING!
Physical injuries and damage to property and the environment caused by
hazardous media
Upon contact with hazardous media (e.g. oxygen, acetylene, ammable or toxic
substances), harmful media (e.g. corrosive, toxic, carcinogenic, radioactive),
and also with refrigeration plants and compressors, there is a danger of physical
injuries and damage to property and the environment.
Should a failure occur, aggressive media with extremely high temperature and
under high pressure or vacuum may be present at the instrument.
▶
For these media, in addition to all standard regulations, the appropriate existing codes or regulations must also be followed.
▶
Wear the requisite protective equipment.
EN
For contact details see chapter 1 “General information” or the back page of the
operating instructions.
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