Pfeiffer Vacuum HPT 200 User manual

PG 0024 BEN/C (1605)
OPERATING INSTRUCTIONS EN
Translation of the original instructions
HPT 200
Pirani/Bayard-Alpert Gauge

Table of contents
2
Table of contents
1 About this manual. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1 Validity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2 Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1 Safety precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.2 Proper use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.3 Improper use. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 Product description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.1 Product identification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.2 Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.3 Range of application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4 Transport and storage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
5.1 Vacuum connection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
5.2 Electrical connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
6 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
6.1 Before switching on. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
6.2 Bakeout. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
6.3 Switch on/off the BA sensor filament. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
6.4 Selecting switching range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
6.5 Configuring the data exchange . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
6.6 Pfeiffer Vacuum Protocol for "RS-485" . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
6.7 Adjusting the gauge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
7 Degas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
7.1 Switch on degas using control unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
7.2 Switch on degas via serial interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
8 Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
8.1 Replacing the sensor head . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
9 Malfunctions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
9.1 Rectifying malfunctions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
10 Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
11 Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
12 Spare parts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
13 Technical data and dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
13.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
13.2 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
13.3 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
13.4 Gas correction factor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Declaration of conformity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

About this manual
3
1 About this manual
1.1 Validity
This operating manual is for customers of Pfeiffer Vacuum. It describes the functioning
of the designated product and provides the most important information for safe use of
the unit. The description follows applicable EU guidelines. All information provided in this
operating manual refers to the current state of the product's development. The documen-
tation remains valid as long as the customer does not make any changes to the product.
Up-to-date operating instructions can also be downloaded from
www.pfeiffer-vacuum.com.
1.2 Conventions
Safety instructions The safety instructions in Pfeiffer Vacuum operating instructions are the result of risk
evaluations and hazard analyses and are oriented on international certification stan-
dards as specified by UL, CSA, ANSI Z-535, SEMI S1, ISO 3864 and DIN 4844. In this
document, the following hazard levels and information are considered:
Pictographs
Instructions in the
text
Work instruction: here you have to do something.
Abbreviations HPT: Digital Pirani/Bayard-Alpert gauge
BA sensor: Bayard-Alpert sensor
WARNING
Possibly imminent danger
Indicates an imminent hazardous situation that can result in death or serious injury.
CAUTION
Possibly imminent danger
Indicates an imminent hazardous situation that can result in minor or moderate injury.
NOTICE
Command or note
Command to perform an action or information about properties, the disregarding of
which may result in damage to the product.
Warning of a displayed source of danger in connection with operation of
the unit or equipment
Command to perform an action or task associated with a source of dan-
ger, the disregarding of which may result in serious accidents
Important information about the product or this document

4
Safety
2Safety
2.1 Safety precautions
The gauge HPT 200 has been tested and accepted in compliance with EN 61010/VDE
0411 “Safety Equipment for Electrical Components”.
●Observe the safety and accident prevention regulations.
●Check regularly that all safety precautions are being complied with.
●The unit has been accredited with protection class IP 54. Take necessary measures
when installing into ambient conditions, which afford other protection classes.
●Consider possible reactions between the materials and the process media.
●Consider possible reactions of the process media due to the heat generated by the
product.
●Do not modify or alter the unit yourself.
●Note the shipping instructions, when returning the unit.
●Inform yourself about a possible contamination before starting work.
●Adhere to the relevant regulations and take the necessary precautions, when handling
contaminated parts.
●Communicate the safety instructions to other users.
2.2 Proper use
●Only use the HPT 200 digital gauge for measuring total pressures in the
5 • 10-10 ... 1000 hPa range.
2.3 Improper use
Improper use will cause all claims for liability and warranties to be forfeited. Improper use
is defined as usage for purposes deviating from those mentioned above, especially:
●connection to pumps or units which are not suitable for this purpose according to their
operating instructions
●connection to units which have exposed voltage-carrying parts
●operation of the devices in areas with ionizing radiation
Duty to inform
Each person involved in the installation or operation of the unit must read and observe
the safety-related parts of these operating instuctions.
The operator is obligated to make operating personnel aware of dangers originating
from the unit or the entire system.

Product description
5
3 Product description
The digital gauge HPT 200 consists of a Bayard-Alpert based ionization sensor with hot
cathode and a Pirani sensor, whose measurement principle is based on the pressure-
dependent thermal conductivity of gases.
3.1 Product identification
To correctly identify the product when communicating with Pfeiffer Vacuum, always have
the information from the rating plate available.
Fig. 1: Product identification on the rating plate
Scope of delivery The following positions are included in the delivery consignment:
– HPT 200
– Protective cover
– Operating instructions
3.2 Function
The gauge can be operated in conjunction with the DigiLine Controller and the measur-
ing software DokuStar (please see "Accessories") on a PC or with customized, digital sig-
nal evaluation.
The gauge responds to measurement value queries, type queries and setting com-
mands.
Fig. 2: DigiLine HPT 200 in Standardausführung
D-35641 Asslar
Mod.: CPT 100
Range: 2000 - 1 mbar
Mod.-No.: PT R31 130
Ser.-No.: 42000618 Made in
Germany
2012/03
1 RS-485 Schnittstelle
2Status-LED
S Adresswahlschalter (Pos. 1-16),
Adresse 1 --> Werkseinstellung
1
2
S
RS-485
3
1
5
13
15
9
11 7
device status
RS485
adr

6
Transport and storage
3.3 Range of application
The unit HPT 200 must be installed and operated in the following ambient conditions:
4 Transport and storage
Units without external protection must not come into contact with electrostatically charge-
able materials and must not be moved within electrical or magnetic fields.
In rooms with moist or aggressive atmospheres, the unit must be airproof shrink-
wrapped in a plastic bag together with a bag of desiccant.
Keep the original protective covers.
Installation location weather protected (indoor)
Protection class IP 54
Installation altitude max. 2000 m
Ambient temperature +5°C to +60°C
Relative humidity 5 ... 85 %, non-condensing
Atmospheric pressure 860 hPa - 1060 hPa

Installation
7
5 Installation
5.1 Vacuum connection
Mounting orientation The installation position can be freely selected. The preferred position is a horizontal to
vertical position so that condensate and particles do not penetrate the measurement
chamber.
Connecting the
gauge
Remove the protective cover, which is required during maintenance work.
Make the flange connection.
NOTICE
Vacuum component
Dirt and damage impair the function of the vacuum component.
When handling vacuum components, ensure that they are kept clean and are protect-
ed against damage.
Ensure that the connection flange is clean, dry and free of grease.
CAUTION
Excess pressure in the vacuum system 1500 to 4000 hPa
Damage to health through emission of process media, because elastomer washers
cannot withstand the pressure.
Use sealing rings with an outer centering ring.
CAUTION
Excess pressure in the vacuum system > 1000 hPa
Danger of injuries by inadvertent opening of elements under stress due to parts flying
around.
Only use stressed elements, which can be opened and closed with appropriate tools
(e.g. strap retainer-tension ring).

8
Installation
5.2 Electrical connection
Communication is effected, depending on the position of the address selector switch at
the gauge (address settable from 1–16), via Serial Interface RS-485.
Setting the address
selection switch
Fig. 3: Setting the address selection switch
Remove the rubber plug (not shown in the illustration) from the address selector
switch, and set the required address according to the relevant connection situation.
Reinsert the rubber plug.
RS-485
M12 socket with screw coupling for the connection of a Pfeiffer Vacuum control unit or a
PC. The use of a Y-connector enables the series connection in a bus system.
Connecting the
gauge to the DPG 202
controller
Up to 2 gauges can be connected to the DPG 202 controller.
Fig. 4: Connections diagram gauge/DPG 202
Set the relevant address at the address selector switch S.
Connect the gauge to the control unit using the connection cable.
Switch on the control unit.
NOTICE
Damage to the product
Only connect cables when de-energized.
Never establish a connection using a live cable.
S
1
RS-485
adr
RS-485
3
5
13
15
9
11 7
device status
RS-485
adr
12
34
5
Pin Assignment
1 RS-485: D+
2+24V
3GND
4 RS-485: D-
5 not connected
USB
RS-485
set
DPG 202
V
A
UU
M
C
12 12

Operation
9
Connecting the
gauge to the USB/RS-
485 converter
Fig. 5: Connections diagram gauge - USB/RS-485 converter
Set the relevant address at the address selector switch S.
Connect the gauge to the USB/RS-485 converter using the connection cable.
Connect the gauge to the power supply.
6Operation
6.1 Before switching on
After switching on the power supply, the connected gauge is ready for operation. It is ad-
visable to wait for a stabilization period of 5-10 minutes before measurement. Operate
the gauge during the measurement continuously independent of the applied pressure.
The measured pressure will depend on the type of gas. A suitable gas-type correction
factor for Pirani or hot cathode components can be set in the gauge for the pressure
range below 0.1 hPa to adjust to different gases. The gas-type correction factor is factory
set for air and N2at 1.00 (see p. 23, chap. 13.4).
Operation display via
LED
USB/RS-485
Converter
24 V DC
12 12
Status within 1s Meaning
off no or insufficient power supply
green on valid measurement at two-component gauges, sensor component for
low pressure range is activ)
green flashing, (1 Hz) Sensor component for high pressure range is activ. Only valid for two-
component gauges
yellow on Unit function is O.K., but due to internal operations (e. g. during ad-
justment or Degas operation) no valid measuring values will be dis-
played temporarily
Measuring range: overrange / underrange
after automatic switching from filament 1 to filament 2
red on Software or unit malfunction
green/yellow/red off (1 s) one-off: LED test after reset
red/green flashing, (1 Hz) Software update in process

10
Operation
6.2 Bakeout
Fig. 6: Replacing the sensor assembly
Während des Ausheizens des Sensorkopfes kann dieser am Vakuumsystem montiert
verbleiben.
Unscrew the knurled nuts 3 at the flange,
– pay attention to the sealing washers 4, as they ensure the protection class.
Pull off housing 7 including the elektronics from the sensor head 5.
Bake out sensor head 5, pay attention to max. bakeout temperatur (180 °C) at the
flange.
Adjust the gauge.
CAUTION
Excessive bakeout temperature!
Danger of damage to the electronics and the magnetic unit if applicable!
For baking temperatures > 60°C, always remove the electronics and magnetic unit
from sensor head 5 and only bake out flange.
The housing flange 5a must not be thermally isolated. During baking it needs to be
cooled by natural convection of ambient air.
Pay attention to the the component assignments, do not interchange.
5
6
4
3
5a 7

Operation
11
6.3 Switch on/off the BA sensor filament.
With this gauge the BA sensor can be switched on/off to suit process requirements.This
is achieved using measuring devices via the PC software Dokustar (≥V 4.00) or can be
customized in accordance with the communication instructions.
When the power supply is switched on, the "Filament" parameter is set to "On", (default
setting), i.e. the HPT 200 is operating in normal mode. Status changes of this parameter
during operation are stored only temporarily. The status of the "Filament" parameter can
be altered at any time and remains stored until the power supply is switched off.
Switch on/off condi-
tions
1The Pirani display will continue until this timer expires. If output "ur" occurs as the Pirani value be-
fore the "On" command, output 1·10-4 hPa will be set during the timer run time (otherwise, display
"ur" could be interpreted as the BA underrange during the timer run time). Output of the combination
value from the Pirani and BA sensors will occur upon expiry of the "Switch-on timer".
Adjustment commands for parameter 041 during the degas process will trigger error message
"_LOGIC" in response.
Switching on/off the BA sensor using control unit
See Operating Instructions for the respective control unit for switching on/off the sen-
sor components.
Switching on/off the CC sensor for communication via RS-485-interface
Switch on BA sensor by sending [P:041] with value 1.
Switch off BA sensor by sending [P:041] with value 0.
BA sensor
status: Adjustment command with
Parameter "041"
Pirani pressure Ppactual Effect on BA sensor
switched on On - No effect
switched off On ≥9·10-3 hPa Filament is switched on at
Pp<8·10-3 hPa
switched off Off ≥9·10-3 hPa Filament stays switched off at
Pp<8·10-3 hPa
switched on Off - Filament is switched off
switched off On ≤8·10-3 hPa Filament will be switched on and
the "Switch-on timer" started.1

12
Operation
6.4 Selecting switching range
Depending on the application, the HPT 200 gauge enables adjustment of the switching
range between Pirani and BA sensors to avoid
– the set value for pressure control is in the switching range or,
– in the case of coating applications, the hot cathode (BA) being switched on and gets
prematurely contaminated.
Fig. 7: Switching ranges HPT 200
Communication with con-
troller DPG 202
Select switching ranges of the sensor components according to the operating manual
for the control unit.
Communication via
serial interface
Select switching range:
–switch: transmit [P:049] with value 0
–trans_LO: transmit [P:049] with value 1
–trans_HI: transmit [P:049] with value 2
6.5 Configuring the data exchange
Communication is effected, depending on the position of the address selector switch at
the gauge (address settable from 1–16), via Serial Interface RS-485.
●9600 baud
●8 data bits
●1 stop bit
●no parity
Parameter overview
SwMode
switch:
trans_LO:
trans_HI:
Direct switching at 4 · 10-4 hPa
BA "On" at p ≤4 · 10-4 hPa
BA "Off" at p 6 · 10-4 hPa
Overlapping at 1 ... 2 · 10-3 hPa
BA "On" at p ≤3 · 10-3 hPa
BA "Off" at p > 4 · 10-3 hPa
Overlapping at 2 ... 5 · 10-3 hPa
BA "On" at p ≤8 · 10-3 hPa
BA "Off" at p > 9 · 10-3 hPa
(Standard design)
Pirani-SensorBA-Sensor hPa
# Name Data type Handling
CPT 200
PPT 200
RPT 200 HPT 200
MPT 200
022 Filament selection 7 - u_short_int readable, writable X
040 Degas 6 - boolean_new readable, writable X
041 Sensor on/off 6 - boolean_new readable, writable XX
049 Switch mode 7 - u_short_int readable, writable XXX
303 Actual error code 4 - string read-only XXXXX
312 Software version 4 - string read-only XXXXX
349 Component name 4 - string read-only XXXXX
730 Pressure switch-
point 1
10 - u_expo_new readable, writable only analog/relay
version
732 Pressure switch-
point 2
10 - u_expo_new readable, writable only analog/relay
version
740 Pressure in [hPa] 10 - u_expo_new readable, condition-
ally writable
XXXXX
741 Pressure set point 7 - u_short_int only writable XXXXX
742 Correction value
(Pirani)
2 - u_real readable, writable XXXX
743 Correction value
(Bayard-Alpert)
2 - u_real readable, writable X

Operation
13
Parameters are displayed in square brackets as a three-digit number in bold font. The
designation may also be stated if necessary.
Example: [P:312] Software version
Applied data types
Filament selection
[P:022] The parameter 022 allows flexible selection of the filament:
000 = auto
The gauge operates with filament 1 until it breakes and then switches to filament 2. As a
warning the status LED turns yellow when the filament changes from 1 to 2.
001 = Filament 1
The gauges operates with filament 1 until it breakes. The status LED turns red to signal-
ize the error condition.
002 = Filament 2
The gauges operates with filament 1 until it breakes. The status LED turns red to signal-
ize the error condition.
Reading the actual
pressure value
[P:740]
Pressure value as the value to be queried and also as equalization (see below) are trans-
mitted by means of a string in the format "aaaabb", whereby "aaaa" is the mantissa and
"bb" the exponent with offset 20 of an exponential number. "aaaa" is therefore in the
range "1000" (for 1.000) to "9999" (for 9.999). The individual characters of the string are
the numbers "0" (ASCII 48) to "9" (ASCII 57).
Example: "104223" represents 1.042 x 10+3 hPa, "750015" represents 7.500 x 10-5 hPa
(Depending on the gauge and its accuracy the number of significant digits in the mantis-
sa can vary).
Reading error codes
[P:303] Parameter 303 transfers the actual error code of the unit. The following error codes can
occur:
743 Correction value
(Cold cathode)
2 - u_real readable, writable X
Data type Description Size l1 - l0 Example
0 - boolean_old Boolean value (false / true) 06 000000 / 111111
1 - u_integer Positive integer number 06 000000 to 999999
2 - u_real Positive fixed point number 06 001571 equal to 15.71
4 - string String 06 TC_400
6 - boolean_new Boolean value (false / true) 01 0 / 1
7 - u_short_int Positive integer number 03 000 to 999
10 - u_expo_new Positive exponential number 06 100023
11 - string String 16 BrezelBier&Wurst
# Name Data type Handling
CPT 200
PPT 200
RPT 200 HPT 200
MPT 200
Value
CPT 200 PPT 200 RPT 200 HPT 200 MPT 200
Meaning
000000 XXXXXNo error
Wrn001 XFilament 1 defectve in auto-mode
Err001 XXXXXDefective gauge
Err002 XXXXXDefective memory
Err003 XFilament 1 defective
Err004 XFilament 2 defective
Err005 XBoth filaments defective

14
Operation
Reading the compo-
nent names [P:349] Parameter 349 contains a token of the component name:
Reading the software
version [P:312] The software version can be read from the connected device using parameter 312:
●Example: 010100
Reading/writing the
Pirani gas correction
factor [P:742]
The correction factor can be set to values in the range 0.2–8.0 :
●Example: 1,00 (written as 000100)
Reading/writing the
gas correction factor
for Bayard-Alpert
[P:743]
The correction factor can be set to values in the range 0.2–8.0 :
●Example: 1,00 (written as 000100)
CPT200
RPT200
PPT200
HPT200
MPT200

Operation
15
6.6 Pfeiffer Vacuum Protocol for "RS-485"
Telegram frame The telegram frame of the Pfeiffer Vacuum protocol contains only ASCII code characters
[32; 127], the exception being the end character of the message CR. Basically, a master
(e.g. a PC) sends a telegram, which is answered by a slave (e.g. electronic drive
unit or gauge).
Telegrams Data request ?
Control command !
Data response / control command understood 
Error message 
Telegram examples
Read actual pressure value (data query)
(Parameter [P:740], Slave device address: "001")
Activate/send parameter for atmospheric pressure (high pressure) (control com-
mand)
Atmospheric pressure adjustment (Parameter [P:741/740], Slave device address: "001")
a2 a1 a0 * 0 n2 n1 n0 l1 l0 dn ... d0 c2 c1 c0 CR
a2 - a0 Unit address for slave 
– Individual address of the unit ["001";"015"]
*Action
n2 - n0 Pfeiffer Vacuum parameter numbers
l1 - l0 Data length dn ... d0
dn - d0 Data in data type concerned
c2 - c0 Checksum (sum of ASCII values of cells a2 to d0) modulo 256
CRCarriage return (ASCII 13)
a2 a1 a0 0 0 n2 n1 n0 0 2 = ? c2 c1 c0 CR
a2 a1 a0 1 0 n2 n1 n0 l1 l0 dn ... d0 c2 c1 c0 CR
a2 a1 a0 1 0 n2 n1 n0 l1 l0 dn ... d0 c2 c1 c0 CR
a2 a1 a0 1 0 n2 n1 n0 0 6 N O _ D E F c2 c1 c0 CR
_RANGE
_LOGI C
NO_DEF The parameter n2 - n0 does not exist
_RANGE Data dn - d0 are outside the permitted range
_LOGIC Logic access violation
?0010074002=?106CR
ASCII 48 48 49 48 48 55 52 48 48 50 61 63 49 48 54 13
 0011074006100023025CR
ASCII 48 48 49 49 48 55 52 48 48 54 49 48 48 48 50 51 48 50 53 13
?0011074103001130CR
ASCII 48 48 49 49 48 55 52 49 48 51 48 48 49 49 51 48 13
 0011074103001130CR
ASCII 48 48 49 49 48 55 52 49 48 51 48 48 49 49 51 48 13

16
Operation
Activate/send parameter for low pressure (control command)
Low pressure adjustment (Parameter [P:741/740], Slave device address: "001")
6.7 Adjusting the gauge
The gauge is factory-adjusted. It may be necessary to adjust the Pirani sensor in the
event of contamination, other installation positions, extreme temperature fluctuations,
ageing, etc. This is carried out using the "DokuStar" PC software via a connected control
unit or according to customer requirements following the communication instructions.
A Pirani equalization in the "ur"-range (underrange) will occur automatically under the fol-
lowing, simultaneously applicable conditions:
– the measuring value of the BA sensor is < 5 10-5 hPa.
– the measuring value of the Pirani sensor will remain constant for 1 minute and will not
deviate too much from the last calibrated value.
Before adjustment, the gauge should be operated at the relevant pressure for approx. 5–
10 minutes (warm-up time).
For correct zero point adjustment, the pressure in the vacuum chamber must be
p≤1·10-5 hPa.
With controller
DPG 202:
Adjust the gauge as described in the instruction for the control unit.
RS-485 Evacuate the vacuum chamber to the pressure p ≤1·10-5 hPa.
Set the pressure adjusting point [P:741] to "000" for low pressure and transmit.
Send actual pressure value [P:740] with value "000000" for low pressure (corre-
sponds to p < 1·10-5); ==> "ur" (under range).
Vent vacuum chamber to atmospheric pressure with air or N2; afterwards wait about
10 minutes.
Set the pressure adjusting point [P:741] to "001" for high pressure and transmit.
Set the actual pressure value to the atmospheric pressure ("100023" for 1000 hPa).
?0011074103000129CR
ASCII 48 48 49 49 48 55 52 49 48 51 48 48 48 49 50 57 13
 0011074103000129CR
ASCII 48 48 49 49 48 55 52 49 48 51 48 48 48 49 50 57 13

Degas
17
7 Degas Deposits on the electrode system of the hot-cathode gauge may cause instability in the
measuring signal on the one hand and increased degassing in the ultra-high vacuum on
the other, which means that too high pressure may possibly be measured.
In this case, it is appropriate to clean the sensor anode by outgassing the adsorbed gas
particles at a pressure below 2 ·10-6 hPa. This occurs by starting the degas process via
the connected control unit, Windows software DokuStar or in accordance with the Com-
munication Instructions. The anode heats up to 800 °C through ohmic heating. The out-
gassing lasts approx. 3 minutes, but can be aborted at any time.
Whilst the gauge is in Degas mode, the pressure measurement is carried out with re-
duced accuracy.
7.1 Switch on degas using control unit
Start degas process in accordance with the Operating Instructions for the respective
control unit.
7.2 Switch on degas via serial interface
Switch on degas process by sending [P:040] with value 1.
Switch off degas process by sending [P:040] with value 0.
8 Maintenance
NOTICE
Vacuum component
Dirt and damage impair the function of the vacuum component.
When handling vacuum components, ensure that they are kept clean and are protect-
ed against damage.
Ensure that the connection flange is clean, dry and free of grease.
WARNING
Contamination of gauge parts possible due to the media measured!
Poisoning hazard through contact with harmful substances.
In the case of contamination, carry out appropriate safety precautions in order to pre-
vent danger to health through dangerous substances.
Decontaminate affected parts before carrying out maintenance work.

18
Malfunctions
8.1 Replacing the sensor head
In case of a defective sensor or if the gauge cannot be adjusted after cleaning, the sensor
assembly 5 must be replaced.
Fig. 8: Replacing the sensor assembly
Dismantling Turn off the vacuum pump, vent to atmospheric pressure and allow to cool.
Switch off the power supply on the control unit/power supply or disconnect the equip-
ment from the mains supply.
Loosen any connection cables.
Detach the gauge from the vacuum apparatus.
Unscrew the knurled nuts 3 at the flange,
– pay attention to the sealing washers 4, as they ensure the protection class.
Remove sensor assembly 5 (cover and flange) from the housing.
Assembly Assembling is carried out in reverse order.
Install the replacement sensor assembly 5 into the housing;
– while carefully insert pin header into pin pitch,
– pay attention to O-ring 6.
Screw in the knurled nuts 3 again, pay attention to sealing washers 4.
Install the gauge.
Adjust the gauge.
9 Malfunctions
9.1 Rectifying malfunctions
5
6
4
3
5a 7
Problem Possible causes Remedy
Gauge does not respond ●No supply voltage
●Wrong serial interface type or
incorrect address set
●Gauge defective
Connect cable or power supply.
Set the address selector switch
to the serial interface to be used.
Replace gauge.
The measurement value is too
large in the high vacuum
●High gauge degassing
●Transmitter defective
Degas gauge.
Replace gauge.

Service
19
10 Service Malfunctions of the gauge, caused by contamination or wear, as well as wear parts (e.g.
heating filament) are not covered by warranty.
●If the sensor head is defective, it can be exchanged by the customer as described in
section maintenance
●If the electronic is defective, a repair is uneconomical and therefore not intended in
case of damage.
– Send the unit and have it replaced with a new unit
Sending of units (under warranty)
For a quick and smooth handling of the service process, Pfeiffer Vacuum recommends
the following steps:
Download the forms "Service Request" and Declaration on Contamination.1)
Fill out the "Service Request" form and send it by fax or e-mail to your local Pfeiffer
Vacuum service contact.
Include the confirmation on the "Service Request" from Pfeiffer Vacuum with your
shipment.
Fill out the Declaration of Contamination and include it in the shipment. This document
is mandatory to protect our service engineers.
– Fill out and send one declaration for each device.
If possible, send unit in the original packaging.
In the absence or incompleteness of the "Declaration on Contamination" and/or the use
of unsuitable transport packaging, Pfeiffer Vacuum reserves the right to make a decon-
tamination and/or to send the product back at the shipper’s expense.
Service orders
All service orders are carried out exclusively according to our repair conditions for vacu-
um units and components. Detailed information, addresses and forms at:
http://www.pfeiffer-vacuum.com/service/repair-services/container.action.
1) Forms under www.pfeiffer-vacuum.com

20
Accessories
11 Accessories
12 Spare parts
Designation HPT 200
Termination resistor for RS-485 PT 348 105 -T
M12 m plug 4-pole with screw terminals RS-485 PT 348 106 -T
Power separator for RS-485 PT 348 132 -T
Adapter RS-485, M12, 4-pole - D-sub socket, 9-pole, 0.2 m PT 348 133 -T
Supply cable DigiLine, M12, 4-pole to TPS, 3 m PT 348 163 -T
Connection cable, RS-485, M12/D-sub 9-pole, 3 m PT 348 223 -T
Interface cable, M12 m straight/M12 m straight, 3 m PM 061 283 -T
Y-Connector M12 to RS-485 P 4723 010
Connector M12 to RS-485 PM 061 270 -X
DPG 202, Controller and power supply unit for up to 2 gauges PT G12 020
TPS 110, mains pack for wall/standard rail fitting PM 061 340 -T
TPS 111, mains pack 19" rack module 3HU PM 061 344 -T
USB converter to RS-485 interface PM 061 207 -T
DokuStar Plus software, 16 channels PT 882 501
PV TurboControl - Software for Pfeiffer Vacuum products with PV protocol PM 061 741
Centering ring, with poral filter, FPM/stainless steel, DN 40 ISO-KF PF 117 240 -T
Pos. Description Flange for Gauge No.
5 Sensor assembly DN 40 ISO-KF PT R39 15x PT 120 217 -T
5 Sensor assembly DN 40 CF-F PT R39 35x PT 120 218 -T
5 Sensor assembly DN 25 ISO-KF PT R39 14xA PT 120 239 -T
5 Sensor assembly DN 40 ISO-KF PT R39 15xA PT 120 237 -T
5 Sensor assembly DN 40 CF-F PT R39 35xA PT 120 238 -T