Pfeiffer Vacuum MPT 200 User manual

OPERATING INSTRUCTIONS
EN
Translation of the Original
MPT 200
Digital Pirani/cold cathode gauge

Dear Customer,
Thank you for choosing a Pfeiffer Vacuum product. Your new gauge is designed to support
you in your individual application with maximum performance and without malfunctions. The
name Pfeiffer Vacuum stands for high-quality vacuum technology, a comprehensive and
complete range of top-quality products and first-class service. From this extensive, practical
experience we have gained a large volume of information that can contribute to efficient
deployment and to your personal safety.
In the knowledge that our product must avoid consuming work output, we trust that our
product can offer you a solution that supports you in the effective and trouble-free
implementation of your individual application.
Please read these operating instructions before putting your product into operation for the
first time. If you have any questions or suggestions, please feel free to contact info@pfeiffer-
vacuum.de.
Further operating instructions from Pfeiffer Vacuum can be found in the Download Center on
our website.
Disclaimer of liability
These operating instructions describe all models and variants of your product. Note that your
product may not be equipped with all features described in this document. Pfeiffer Vacuum
constantly adapts its products to the latest state of the art without prior notice. Please take
into account that online operating instructions can deviate from the printed operating
instructions supplied with your product.
Furthermore, Pfeiffer Vacuum assumes no responsibility or liability for damage resulting from
the use of the product that contradicts its proper use or is explicitly defined as foreseeable
misuse.
Copyright
This document is the intellectual property of Pfeiffer Vacuum and all contents of this
document are protected by copyright. They may not be copied, altered, reproduced or
published without the prior written permission of Pfeiffer Vacuum.
We reserve the right to make changes to the technical data and information in this document.
2/54

Table of contents
1 About this manual 7
1.1 Validity 7
1.1.1 Applicable documents 7
1.1.2 Variants 7
1.2 Target group 7
1.3 Conventions 8
1.3.1 Instructions in the text 8
1.3.2 Pictographs 8
1.3.3 Stickers on product 8
1.3.4 Abbreviations 9
1.4 Trademark proof 9
2 Safety 10
2.1 General safety information 10
2.2 Safety instructions 10
2.3 Safety precautions 13
2.4 Limits of use of the product 13
2.5 Proper use 14
2.6 Foreseeable improper use 14
3 Product description 15
3.1 Function 15
3.1.1 Gauge mode of operation 15
3.1.2 Measuring range 15
3.1.3 Measurement systems 15
3.1.4 Cold cathode measuring system 16
3.1.5 Pirani measurement system 16
3.2 Identifying the product 16
3.3 Scope of delivery 16
4 Transport and storage 17
4.1 Transporting the product 17
4.2 Storing the product 17
5 Installation 18
5.1 Establishing vacuum connection 18
5.2 Creating "RS-485" connection 19
6 Interfaces 21
6.1 Interface RS-485 21
6.2 Pfeiffer Vacuum protocol for RS-485 interface 21
6.2.1 Telegram frame 21
6.2.2 Telegram description 22
6.2.3 Telegram example 1 22
6.2.4 Telegram example 2 22
6.2.5 Data types 23
7 Parameter set 24
7.1 General 24
7.2 Overview of parameters of MPT gauge 24
7.3 Control commands 25
7.4 Status requests 25
7.5 Pressure values and correction factors 25
8 Operation 26
8.1 Selecting switching ranges 27
8.2 Determining effective pressure with correction factors 27
Table of contents
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8.3 Switching cold cathode sensor on/off 29
8.4 Reading and setting relay and switch-points 30
8.5 Baking out gauge 30
9 Dismantling 32
10 Maintenance 34
10.1 Cleaning of components 34
10.2 Calibrating gauge 35
10.3 Replacing measurement system 36
11 Malfunctions 38
12 Shipping 39
13 Recycling and disposal 40
13.1 General disposal information 40
13.2 Dispose of gauges 40
14 Service solutions by Pfeiffer Vacuum 41
15 Spare parts 43
16 Accessories 44
16.1 Accessory information 44
16.2 Ordering accessories 44
17 Technical data and dimensions 46
17.1 General 46
17.2 Technical data 46
17.3 Dimensions 48
UL/CSA certification 50
EC Declaration of Conformity 51
UK Declaration of Conformity 52
Table of contents
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List of tables
Tbl. 1: Applicable documents 7
Tbl. 2: Variants 7
Tbl. 3: Abbreviations used 9
Tbl. 4: Permissible ambient conditions 14
Tbl. 5: Features of the RS-485 interface 21
Tbl. 6: Explanation and meaning of the parameters 24
Tbl. 7: Overview of parameters of MPT gauge 24
Tbl. 8: Parameter set | Control commands 25
Tbl. 9: Parameter set | Status requests 25
Tbl. 10: Parameter set | Pressure values and correction factors 25
Tbl. 11: Operating mode display via "device status" LED 26
Tbl. 12: Correction factor for Pirani-only operation 28
Tbl. 13: Correction factors for cold cathode 29
Tbl. 14: Switch-on/-off condition 29
Tbl. 15: Malfunctions 38
Tbl. 16: Spare parts 43
Tbl. 17: Accessories 45
Tbl. 18: Conversion table: Pressure units 46
Tbl. 19: Conversion table: Units for gas throughput 46
Tbl. 20: Measured and pressure values 46
Tbl. 21: Electrical data 46
Tbl. 22: RS-485 interface 47
Tbl. 23: Connection flanges and weight 47
Tbl. 24: Ambient conditions 47
Tbl. 25: Temperatures 47
Tbl. 26: Substances in contact with media 47
List of tables
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List of figures
Fig. 1: Structure of the MPT gauge 15
Fig. 2: Measuring configuration 15
Fig. 3: Establishing vacuum connection 19
Fig. 4: Cross-link via connection RS-485 using connection cables and accessories 20
Fig. 5: Cross-link via RS-485 connection using OmniControl 20
Fig. 6: Connection assignment of RS-485 connecting socket 21
Fig. 7: Examples of reading current pressure values via [P:740] 26
Fig. 8: Selecting switching ranges 27
Fig. 9: Measurement curve for Pirani-only operation and when using the correction
factors
28
Fig. 10: Components of the gauge 30
Fig. 11: Replacing measurement system 36
Fig. 12: MPT 200 with DN 25 ISO-KF 48
Fig. 13: MPT 200 with DN 40 ISO-KF 48
Fig. 14: MPT 200 with DN 40 CF-F 49
List of figures
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1 About this manual
IMPORTANT
Read carefully before use.
Keep the manual for future consultation.
1.1 Validity
This document describes the function of the products listed in the following and provides the most im-
portant information for safe use. The description is written in accordance with the valid directives. The
information in this document refers to the current development status of the products. The document
retains its validity assuming that the customer does not make any changes to the product.
1.1.1 Applicable documents
Designation Document
Operating instructions for “Control unit” OmniControl PT 0670
Declaration of conformity A component of these instructions
Tbl. 1: Applicable documents
You can find this document in the Pfeiffer Vacuum Download Center.
1.1.2 Variants
This document applies to products with the following article numbers:
Article number Designation
PT R40 140 MPT 200, DN 25 ISO-KF
PT R40 150 MPT 200, DN 40 ISO-KF
PT R40 350 MPT 200, DN 40 CF-F
Tbl. 2: Variants
The part number is found on the rating plate of the product.
Pfeiffer Vacuum reserves the right to make technical changes without prior notification.
Information that relates to only one of the products is indicated accordingly.
The figures in this document are not to scale.
Graphics without a caption reflect the product featuring a DN 25 ISO-KF vacuum connection, however,
they also apply for the other vacuum connection accordingly.
Dimensions are in mm unless stated otherwise.
1.2 Target group
These operating instructions are aimed at all persons performing the following activities on the product:
●Transportation
●Setup (Installation)
●Usage and operation
●Decommissioning
●Maintenance and cleaning
●Storage or disposal
The work described in this document is only permitted to be performed by persons with the appropriate
technical qualifications (expert personnel) or who have received the relevant training from Pfeiffer Vac-
uum.
About this manual
7/54

1.3 Conventions
1.3.1 Instructions in the text
Usage instructions in the document follow a general structure that is complete in itself. The required ac-
tion is indicated by an individual step or multi-part action steps.
Individual action step
A horizontal, solid triangle indicates the only step in an action.
►This is an individual action step.
Sequence of multi-part action steps
The numerical list indicates an action with multiple necessary steps.
1. Step 1
2. Step 2
3. ...
1.3.2 Pictographs
The pictographs used in the document indicate useful information.
Note
Tip
Wear laboratory gloves
Perform a visual inspection
1.3.3 Stickers on product
This section describes all the stickers on the product along with their meanings.
D-35614 Asslar
Mod.
P/N
S/N
Input
MPT 200
PT R40 xxx
12345678
24 V DC 3 W
Made in Germany 2023/01
Range 5.0x10 - 1x10 hPa
-9 3
Rating plate
The rating plate is located on the back
of the device.
About this manual
8/54

1.3.4 Abbreviations
Abbreviation Explanation
ATM Atmosphere
C Correction factor for calculating the pressure of gases other than air
Sensitivity of the Bayard-Alpert measurement system for nitrogen
EC Electron collector
F Filament
HV High vacuum
IC Ion collector
CC Cold cathode
LED Light emitting diode
LPS Limited power source
MSL Mean sea level
p Pressure
P Pirani
PELV Protective extra low voltage
U Measuring signal [V] (output voltage)
Tbl. 3: Abbreviations used
1.4 Trademark proof
●Binder® is a trademark of Franz Binder GmbH + Co. Elektrische Bauelemente KG.
About this manual
9/54

2 Safety
2.1 General safety information
The following 4 risk levels and 1 information level are taken into account in this document.
DANGER
Immediately pending danger
Indicates an immediately pending danger that will result in death or serious injury if not observed.
►Instructions to avoid the danger situation
WARNING
Potential pending danger
Indicates a pending danger that could result in death or serious injury if not observed.
►Instructions to avoid the danger situation
CAUTION
Potential pending danger
Indicates a pending danger that could result in minor injuries if not observed.
►Instructions to avoid the danger situation
NOTICE
Danger of damage to property
Is used to highlight actions that are not associated with personal injury.
►Instructions to avoid damage to property
Notes, tips or examples indicate important information about the product or about this docu-
ment.
2.2 Safety instructions
Safety instructions according to product life stages
All safety instructions in this document are based on the results of a risk assessment.
Pfeiffer Vacuum has taken into account all the relevant life stages of the product.
Risks during installation
DANGER
Risk to life due to electric shock
An improperly earthed product is potentially fatal in the event of a fault.
►Connect the product galvanically with the earthed vacuum chamber.
►Ensure that the connection complies with the requirements of a protective bonding according to
EN 61010. (CF and VCR connections comply with this requirement.)
►Use electrically conductive centering rings and circlips for KF connections.
Safety
10/54

DANGER
Danger to life due to dangerous contact voltage
Voltages above 30 V (AC) or 60 V (DC) are considered dangerous in accordance with EN 61010. If
you come into contact with dangerous contact voltage, this can result in injury through electric shocks
or even death.
►Only connect the product to devices which meet the following criteria:
●Requirements of the earthed protective extra-low voltage (PELV)
●Limited power source (LPS) Class 2
►Secure the line to the product.
–Pfeiffer Vacuum measuring and control equipment complies with this requirement.
DANGER
Danger to life from electric shock
When establishing the voltages that exceed the specified safety extra-low voltage (according to IEC
60449 and VDE 0100), the insulating measures will be destroyed. There is a danger to life from elec-
tric shock at the communication interfaces.
►Connect only suitable devices to the bus system.
WARNING
Danger from magnetic fields
The product has a magnetic field that disturbs or impairs the function of electronic devices (e.g. pace-
makers).
►Maintain the distances specified by the manufacturer of the pacemakers.
–Pfeiffer Vacuum recommends a safety distance of at least 130 mm between the pacemaker
and the product.
►Avoid the influence of strong magnetic fields by means of magnetic field shielding.
Risks during operation
DANGER
Danger to life from electric shock caused by moisture ingress
Water that has entered the unit will result in personal injury through electric shocks.
►Only operate the unit in a dry environment.
►Operate the unit away from fluids and sources of moisture.
►Do not switch on the unit if fluid has entered it. Instead contact Pfeiffer Vacuum Service.
►Always disconnect the power supply before cleaning the unit.
WARNING
Risk of injury resulting from overpressure in the vacuum system
Opening tensioning pieces with an overpressure > 1000 hPa in the vacuum system can lead to inju-
ries as a result of flying parts, and escaping process medium could prove harmful to health.
Elastomer seals in KF connections (e.g. O-rings) are not resistant to pressures > 2500 hPa. This
could prove harmful to health due to escaping process medium.
►Do not open any tensioning pieces when overpressure is prevalent in the vacuum system.
►Use suitable tensioning pieces for overpressure.
►Use tensioning pieces which can only be opened and closed using a tool (e.g. tightening strap-
circlip).
►Use sealing rings with an outer centering ring.
Safety
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Risks during maintenance
DANGER
Danger to life from electric shock caused by moisture ingress
Water that has entered the unit will result in personal injury through electric shocks.
►Only operate the unit in a dry environment.
►Operate the unit away from fluids and sources of moisture.
►Do not switch on the unit if fluid has entered it. Instead contact Pfeiffer Vacuum Service.
►Always disconnect the power supply before cleaning the unit.
WARNING
Health hazard through poisoning from toxic contaminated components or devices
Toxic process media result in contamination of devices or parts of them. During maintenance work,
there is a risk to health from contact with these poisonous substances. Illegal disposal of toxic sub-
stances causes environmental damage.
►Take suitable safety precautions and prevent health hazards or environmental pollution by toxic
process media.
►Decontaminate affected parts before carrying out maintenance work.
►Wear protective equipment.
WARNING
Danger from magnetic fields
The product has a magnetic field that disturbs or impairs the function of electronic devices (e.g. pace-
makers).
►Maintain the distances specified by the manufacturer of the pacemakers.
–Pfeiffer Vacuum recommends a safety distance of at least 130 mm between the pacemaker
and the product.
►Avoid the influence of strong magnetic fields by means of magnetic field shielding.
WARNING
Health hazards due to cleaning agent
The cleaning agent being used causes health hazards which could include, for example, poisoning,
allergies, skin irritations, chemical burns or damage to the airways.
►When handling cleaning agents, observe the applicable regulations.
►Adhere to safety measures regarding handling and disposal of cleaning agents.
►Be aware of potential reactions with product materials.
Risks when shipping
WARNING
Risk of poisoning from contaminated products
Where products that contain harmful substances are shipped for maintenance or repair purposes, the
health and safety of service personnel is at risk.
►Comply with the instructions for safe distribution.
Safety
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Risks during disposal
WARNING
Health hazard through poisoning from toxic contaminated components or devices
Toxic process media result in contamination of devices or parts of them. During maintenance work,
there is a risk to health from contact with these poisonous substances. Illegal disposal of toxic sub-
stances causes environmental damage.
►Take suitable safety precautions and prevent health hazards or environmental pollution by toxic
process media.
►Decontaminate affected parts before carrying out maintenance work.
►Wear protective equipment.
2.3 Safety precautions
The product is designed according to the latest technology and recognized safety engineering rules.
Nevertheless, improper use can result in danger to operator all third party life and limb, and product
damage and additional property damage.
Duty to provide information on potential dangers
The product holder or user is obliged to make all operating personnel aware of dangers
posed by this product.
Every person who is involved in the installation, operation or maintenance of the product
must read, understand and adhere to the safety-related parts of this document.
Infringement of conformity due to modifications to the product
The Declaration of Conformity from the manufacturer is no longer valid if the operator
changes the original product or installs additional equipment.
●Following the installation into a system, the operator is required to check and re-evalu-
ate the conformity of the overall system in the context of the relevant European Direc-
tives, before commissioning that system.
General safety precautions when handling the product
►Observe all applicable safety and accident prevention regulations.
►Check that all safety measures are observed at regular intervals.
►Pass on safety instructions to all other users.
►Do not expose body parts to the vacuum.
►Always ensure a secure connection to the earthed conductor (PE).
►Never disconnect plug connections during operation.
►Observe the above shutdown procedures.
►Keep lines and cables away from hot surfaces (> 70 °C).
►Do not carry out your own conversions or modifications on the device.
►Observe the unit protection degree prior to installation or operation in other environments.
►Provide suitable touch protection, if the surface temperature exceeds 70 °C.
►Inform yourself about any contamination before starting work.
2.4 Limits of use of the product
Parameter Value
Air pressure 800 to 1060 hPa
Relative humidity of air At temperatures up to +30°C max. 80%
At temperatures up to +40°C max. 50%
non-condensing
Mounting orientation Arbitrary
Usage Only in indoor areas
Safety
13/54

Parameter Value
Installation altitude max. 2000 m NN
Protection degree IP54
Tbl. 4: Permissible ambient conditions
2.5 Proper use
The MPT 200 gauge is used for vacuum measurement of air, gases and gauges outside their explosion
limits, within the range of 5 × 10-9 to 1000 hPa.
Use the product according to its intended purpose
►Operate the gauge with a Pfeiffer Vacuum total pressure measuring and control unit or with an
evaluation unit provided by the customer.
►Install, operate and maintain the gauge exclusively as prescribed in these operating instructions.
►Observe the limits of use according to the technical data.
►Observe the technical data.
2.6 Foreseeable improper use
Improper use of the product invalidates all warranty and liability claims. Any use that is counter to the
purpose of the product, whether intentional or unintentional, is regarded as improper use; in particular:
Use of the product in a way not specified by Pfeiffer Vacuum affects the protection provided by the
product.
●Use outside the mechanical and electrical limits of use
●Use with corrosive or explosive media, if this is not explicitly permitted
●Use for the measurement of highly flammable or combustible gases mixed with an oxidizing agent
(e.g. atmospheric oxygen) within the explosion limits
●Use outdoors
●Use after technical changes (inside or outside on the product)
●Use with replacement or accessory parts that are not suitable or not approved
Safety
14/54

3 Product description
3.1 Function
device status
RS485
RS485
adr
9
11
15
5
13
3
7
1
1
2
3
Fig. 1: Structure of the MPT gauge
1 RS-485 address selector switch 3 "RS-485" connector
2 Status LED for the gauge
3.1.1 Gauge mode of operation
The gauge consists of a cold cathode sensor (inverted magnetron) and a Pirani sensor whose measur-
ing principle makes use of the pressure-dependent heat conductivity of gases.
3.1.2 Measuring range
The gauge covers the measuring range from 5 × 10-9 to 1000 hPa.
The gauge has a continuous characteristic throughout the entire range. The measuring signal is loga-
rithmically dependent on the pressure across the entire range. In a defined overlapping range, the
gauge outputs a mixed signal of the two measurement systems. Above this range, the gauge outputs
the Pirani signal only, below it the cold cathode signal only. The gauge applies the optimum measuring
configuration to the respective pressure range.
5 × 10-9 hPa
Plower
1000 hPa
Pirani
Pon
Poff
Pupper
Cold cathode
Fig. 2: Measuring configuration
The switching point Pon is the point at which the cold cathode measuring system switches on when the
pressure decreases. The switching point Poff is the point at which the cold cathode measuring system
switches off when the pressure increases. The transition area between Pupper and Plower is the pressure
area in which the gauge proportionally uses both the Pirani measurement system and the cold cathode
measuring system to determine the pressure. The Pirani proportion decreases as the pressure decreas-
es. In the "hard" switch position, the switchover between Pirani and cold cathode measuring system is
immediate, without a transition.
3.1.3 Measurement systems
The gauge has two measurement systems:
●Pirani measurement system (control area)
●Cold cathode measuring system
Product description
15/54

The Pirani measurement system is always switched on. The Pirani measurement signal is for switching
the cold cathode measuring system on and off, thus protecting the cold cathode measurement system
from excessive contamination.
You can select from 2 different switch-on/off thresholds. If the measured pressure is higher than the
switch-on threshold, the cold cathode measuring system remains switched off and the Pirani measured
value appears as an output signal.
The gauge activates the cold cathode measuring system controlled by the Pirani measurement system
only when the value falls below the switch-on threshold pon. The cold cathode is ready for operation af-
ter a few seconds start-up time. The "device status" LED is lit continuously and the cold cathode meas-
ured value is present at the output. If the pressure increases above the switch-off threshold poff, the
gauge switches off the cold cathode measuring system and the "device status" LED goes out. The Pira-
ni measured value appears again at the output.
3.1.4 Cold cathode measuring system
The cold cathode sensor, of the inverted magnetron type, generates ionized gas molecules in a gas dis-
charge. The measured ion current is a measure of the number of gas molecules present and thus for
the absolute pressure.
3.1.5 Pirani measurement system
The heat conductivity of gases is pressure-dependent within certain limits. This physical phenomenon is
utilized in the Pirani thermal conductivity vacuum gauge to measure the pressure. A self-calibrating
bridge circuit is used as the measuring circuit. A thin tungsten wire is the actual measuring element.
With a suitable control circuit, the resistance of the wire and thus its temperature are kept constant. The
electrical power that is fed to the wire is a measure for the power dissipated in the gas through heat
conduction and therefore a measure for the gas pressure. As the pressure increases, convection and
other effects are increasingly superimposed on the heat transmission. This means that, in the range of
>100 hPa, accurate pressure measurements can no longer be performed with the Pirani measurement
system.
3.2 Identifying the product
You will need all the data from the rating plate to safely identify the product when communicating with
Pfeiffer Vacuum.
►To ensure clear identification of the product when communicating with Pfeiffer Vacuum, always
keep all of the information on the rating plate to hand.
3.3 Scope of delivery
●Gauge
●Operating instructions
Unpacking the product and checking completeness of the shipment
1. Unpack the product.
2. Remove the transport fasteners, transport protection etc.
3. Store the transport fasteners, transport protection etc. in a safe place.
4. Check that the shipment is complete.
5. Ensure that no parts are damaged.
Product description
16/54

4 Transport and storage
4.1 Transporting the product
NOTICE
Damage caused by incorrect transport
Transport in unsuitable packaging or failure to install all transport locks can result in damage to the
product.
►Comply with the instructions for safe transport.
Packing
We recommend keeping the transport packaging and original protective cover.
Transport product safely
►Observe the weight specified on the transport packaging.
►Where possible, always transport or ship the product in the original transport packaging.
►Always use dense and impact-proof transport packaging for the product.
►Remove the existing protective cover and transport protections only immediately prior to installa-
tion.
►Reattach transport locks and transport protections prior to each transport.
4.2 Storing the product
NOTICE
Damage caused by improper storage
Improper storage will lead to damage to the product.
Static charging, moisture, etc. will lead to defects on the electronic components.
►Comply with the instructions for safe storage.
Packing
We recommend storing the product in its original packaging.
Store product safely
►Store the product in a cool, dry, dust-free place, where it is protected against impacts and me-
chanical vibration.
►Always use dense and impact-proof packaging for the product.
►Where possible, store the product in its original packaging.
►Store electronic components in antistatic packaging.
►Maintain the permissible storage temperature.
►Avoid extreme fluctuations of the ambient temperature.
►Avoid high air humidity.
►Seal connections with the original protective caps.
►Protect the product with the original transport protection (where available).
Transport and storage
17/54

5 Installation
5.1 Establishing vacuum connection
DANGER
Risk to life due to electric shock
An improperly earthed product is potentially fatal in the event of a fault.
►Connect the product galvanically with the earthed vacuum chamber.
►Ensure that the connection complies with the requirements of a protective bonding according to
EN 61010. (CF and VCR connections comply with this requirement.)
►Use electrically conductive centering rings and circlips for KF connections.
WARNING
Danger from magnetic fields
The product has a magnetic field that disturbs or impairs the function of electronic devices (e.g. pace-
makers).
►Maintain the distances specified by the manufacturer of the pacemakers.
–Pfeiffer Vacuum recommends a safety distance of at least 130 mm between the pacemaker
and the product.
►Avoid the influence of strong magnetic fields by means of magnetic field shielding.
WARNING
Risk of injury resulting from overpressure in the vacuum system
Opening tensioning pieces with an overpressure > 1000 hPa in the vacuum system can lead to inju-
ries as a result of flying parts, and escaping process medium could prove harmful to health.
Elastomer seals in KF connections (e.g. O-rings) are not resistant to pressures > 2500 hPa. This
could prove harmful to health due to escaping process medium.
►Do not open any tensioning pieces when overpressure is prevalent in the vacuum system.
►Use suitable tensioning pieces for overpressure.
►Use tensioning pieces which can only be opened and closed using a tool (e.g. tightening strap-
circlip).
►Use sealing rings with an outer centering ring.
NOTICE
Impairment from contamination and damage
Touching the devices or components with bare hands increases the desorption rate and leads to in-
correct measurements. Dirt (e.g. dust, fingerprints, etc.) and damage impair the function.
►When working on high or ultra high vacuum systems, always wear clean, lint-free and powder-
free laboratory gloves.
►Only use clean tools.
►Make sure that the connection flanges are free of grease.
►Remove protective caps and protective covers from flanges and connections only when necessa-
ry.
►Carry out all work in a well lit area.
Prerequisites
●Appropriate ambient conditions
●Operating temperature within permissible range
●Adequate room available for electrical connection (e.g. permissible bending radii for cables)
Installation
18/54

5
1
4
3
2
Fig. 3: Establishing vacuum connection
1 Seal with centering ring 4 Seal with centering ring and filter
2 Gauge 5 Tensioning piece
3 Protective cap
Recommendations
►Ensure where possible that the gauge is not exposed to any vibrations during operation, as vibra-
tions in general will lead to deviations in the measured values.
►Mount the gauge in a horizontal to upright mounting orientation (flange facing downwards).
–This prevents condensate and particles from accumulating in the measurement chamber.
►Fit a seal with centering ring and filter for applications susceptible to pollution and to protect the
measuring system against contamination.
Procedure
1. Remove the protective cap and store in a safe place.
2. Assemble the gauge with vacuum components from the Pfeiffer Vacuum Components Shop on
the vacuum system.
5.2 Creating "RS-485" connection
DANGER
Danger to life due to dangerous contact voltage
Voltages above 30 V (AC) or 60 V (DC) are considered dangerous in accordance with EN 61010. If
you come into contact with dangerous contact voltage, this can result in injury through electric shocks
or even death.
►Only connect the product to devices which meet the following criteria:
●Requirements of the earthed protective extra-low voltage (PELV)
●Limited power source (LPS) Class 2
►Secure the line to the product.
–Pfeiffer Vacuum measuring and control equipment complies with this requirement.
NOTICE
Property damage due to ground contact of electronics
Disconnecting or connecting the "RS-485" plug-and-socket connection with the voltage supply
switched leads to the destruction of electronic components.
►Always interrupt the voltage supply before you plug in or unplug the “RS-485” power supply plug.
►Switch off the power supply pack.
►After switching off the power supply pack, wait until the residual load has dispersed completely
before disconnecting or connecting the plug-and-socket connection.
Installation
19/54

The interface designated "RS-485" is used to connect an external power supply pack (TPS), a control
unit or a PC.
Required tools
●Slot screwdriver
1 2
1 2
22
1
34 5
Fig. 4: Cross-link via connection RS-485 using connection cables and accessories
1 Supply cable for power supply pack 4 USB/RS-485 converter
2 Y-connector for RS-485 5 PC
3 Interface cable M12
1 2
1 2
1
2
1
3
Fig. 5: Cross-link via RS-485 connection using OmniControl
1 Y-connector for RS-485 3 OmniControl control unit
2 Interface cable M12
Set RS-485 address
1. Remove the rubber plug from the RS-485 address selector switch.
2. Set the RS-485 address with the RS-485 address selector switch on the gauge.
3. Place the rubber plug back on the RS-485 address selector switch.
Ensure protection degree of the gauge
►After setting the RS-485 address, place the rubber plug back on the RS-485 address selector
switch to establish the specified protection degree.
Cross-linked via the RS-485 connection
1. Install the devices according to the specification for RS-485 interfaces.
2. Make sure that all devices connected to the bus have different RS-485 device addresses.
3. Connect all devices with RS-485 D+ and RS-485 D- to the bus.
Connect Pfeiffer Vacuum display and control units or a PC
►Use a connecting cable from the DigiLine accessories range.
►Connect only one external control unit to the RS-485 interface at a time.
►If needed, connect a PC via the USB/RS-485 converter.
Installation
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