Pfeiffer Vacuum HPT 100 User manual

Translation of the original instructions
Operating Instructions
EN
PG 0004 BEN/M (1112)
HPT 100
Pirani/Bayard-Alpert Transmitter

2
Table of contents
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4 Transport and storage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
5.1 Vacuum connection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
5.2 Electrical connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
5.3 Removal of components for their maintenance . . . . . . . . . . . . . . . . . . . . 10
6 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
6.1 Before switching on. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
6.2 Baking out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
6.3 Switch on/off the BA sensor filament. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
6.4 Selecting switching range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
6.5 Configuring the data exchange . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
6.6 Pfeiffer Vacuum Protocol for "RS-485" . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
6.7 Adjusting the transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
7 Degas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
7.1 Switch on degas using control unit DPG 101/DPG 109:. . . . . . . . . . . . . . 18
7.2 Switch on degas via RS-232/RS-485:. . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
8 Malfunctions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
8.1 Rectifying malfunctions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
9 Maintenance and service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
10 Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
11 Technical data and dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
11.1 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
11.2 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
11.3 Gas correction factor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Declaration of conformity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

3
About this manual
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 refer 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-vacu-
um.com.
1.2 Conventions
Safety instructions The safety instructions in Pfeiffer Vacuum operating manuals are the result of risk eval-
uations and hazard analyses and are oriented on international certification standards 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:
Pictograph
definitions
Instructions in the
text
Work instruction: here you have to do something.
Abbreviations used HPT: Digital Pirani/Bayard-Alpert Transmitter
BA sensor: Bayard-Alpert sensor
NOTE
Command or note
Command to perform an action or information about properties, the disregarding of
which may result in damage to the product.
CAUTION
Possible danger
Injuries or property damages can occur.
WARNING
Possible danger
Injuries or severe property damages can occur.
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 danger, the disregarding of which may result in se-
rious accidents.

4
Safety
2 Safety
2.1 Safety precautions
The transmitter HPT 100 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 40. 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 100 digital transmitter for measuring total pressures in the
1 • 10-9 ... 1000 mbar range.
2.3 Improper use
Improper use will cause all claims for liability and warranties to be forfeited. Improper use
is deemed to be all use 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.
●The operation of the devices in potentially radioactive areas.
NOTE
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.

5
Product description
3 Product description
The digital transmitter HPT 100 is a two-component transmitter comprising one Bayard-
Alpert sensor and one Pirani sensor.
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 100
– Protective cover
– Operating instructions
3.2 Function
The transmitter can be operated in conjunction with the DigiLine Controller, with the Di-
giLine Power Supply units and the WINDOWS1) based measuring software DokuStar
(please see "Accessories") on a PC or with customized, digital signal evaluation.
Communication is carried out, depending on the address selector switch setting, via the
serial RS-232 interface using the relevant display units or via RS-485 using the Pfeiffer
Vacuum protocol. The relevant bus adapters are available for connection to Profibus sys-
tems (see Accessories).
The transmitter responds to measurement value queries, type queries and setting com-
mands.
3.3 Range of application
The unit HPT 100 must be installed and operated in the following ambient conditions:
D-35641 As slar
2
4
6
8
10
12
14
RS 232 RS 4 8 5
Mod.:
Range:
Mod.-No.:
Ser.-No.:
1) WINDOWS is a registered trademark of Microsoft Corporation.
Installation location weather protected (indoor)
Protection class IP 40
Installation altitude max. 2000 m
Ambient temperature +5°C to +50°C
Relative humidity 5 ... 85 %, non-condensing
Atmospheric pressure 86 kPa - 106 kPa

6
Transport and storage
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.

7
Installation
5Installation
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 trans-
mitter
Remove the protective cover, which is required during maintenance work.
Make the flange connection.
5.2 Electrical connection
Communication is effected, depending on the position of the address selector switch at
the transmitter, via Serial Interface RS-232 or via the RS-485 (address settable from 1-
15).
CAUTION
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 1.5 to 4 bar
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 > 1 bar
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).
NOTE
Damage to the transmitter!
Only connect the connection cable when de-energized.
Never establish a connection to the transmitter using a live cable.

8
Installation
Setting the address
selection switch
Fig. 2: Setting the address selection switch
Remove the rubber plugs (not shown in the illustration) from the address selector
switch, and set the required address according to the relevant connection situation.
Connecting the trans-
mitter to the DPG 101
controller
Set the address selector switch on the transmitter to RS-232 mode (basic factory-set-
ting).
Connect the transmitter to the control unit using the connection cable.
Switch on the control unit.
Connecting the trans-
mitter to the DPG 109
controller
Up to nine transmitters in series can be conneted to the DPG 109 controller.
Fig. 3: Connections diagram transmitter-DPG
Set address selector switch S on the transmitter to RS-485 mode with the relevant ad-
dress.
Connect the transmitter to the control unit using the connection cable.
Switch on the control unit.
------------------
------------------
------------------
------------------
S
Vacuum
chamber
RS 232
DPG 101
Trans-
mitter
RS 485
DPG 109
PC
5 4 3 2 1
54
321
98
76
Pin Assignment
1 not connected
2 RS 232, RxD
3 RS 232, TxD
4 not connected
5GND
6VDC
7 RS 485: D-
8 RS 485: D+
9 not connected

9
Installation
Connecting the trans-
mitter to the DPS 101
power supply
Set the address selector switch on the transmitter to RS-232 mode (basic factory-set-
ting).
Connect the transmitter to the power supply unit and to the RS-232 interface on the
PC using the connection cable.
Plug in the power supply unit.
Operate transmitter with software DokuStar (included with DPS 101).
Connecting the trans-
mitter to the DPS 109
power supply
Fig. 4: Connections diagram - DPS 101/DPS 109
Set address selector switch S on the transmitter to RS-485 mode with the relevant ad-
dress.
Connect the transmitter to the power supply unit and to the RS-232 interface on the
PC using the connection cable.
Switch on the supply voltage with switch S1 on the power supply.
Operate the transmitter using the DokuStar Plus software (optional).
Connecting the trans-
mitter to the profibus
adapter TIC 252
Fig. 5: Connections diagram transmitter - TIC 252
Set the address selector switch on the transmitter to RS-232 mode (basic factory-set-
ting).
Plug the TIC 252 into the D-Sub socket on the transmitter and secure using fixing
screws.
Connect the power supply to the TIC 252.
RS 485
RS 232
RS 232
DPS 109
PC
DPS 101
Trans-
Vacuum
chamber
mitter
V
acuum
chamber
TIC 252 Transmitter

10
Installation
Connecting the trans-
mitter to the level
converter TIC 002
Fig. 6: Connections diagram transmitter - TIC 002
Set address selector switch S on the transmitter to RS-485 mode with the relevant ad-
dress.
Connect the transmitter to the TIC 002 using the connection cable.
Connect the power supply to the TIC 002.
Connecting the trans-
mitter to the USB/RS-
485 converter
Fig. 7: Connections diagram transmitter - USB/RS-485 converter
Set address selector switch S on the transmitter to RS-485 mode with the relevant ad-
dress.
Connect the transmitter to the USB/RS-485 converter using the connection cable.
Connect the transmitter to the power supply.
5.3 Removal of components for their maintenance
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 transmitter from the vacuum apparatus.
Close the flange opening by using the original protective cover.
24 V DC
TIC 002
RS-232
RS-485
PC
Transmitter
Vacuum chamber
USB/RS485-
converter
24 V DC
Mod.: Mod.-Nr.:
Input: Output. Masse:
Ser.-Nr.:42000303
RPT100 PT......... .....V,50/60Hz ..VA
.....V,0.2 A .....kg
D-35614Asslar
Mod.: Mod.-Nr.:
Input: Output. Masse:
Ser.-Nr.:42000303
RPT100 PT......... .....V,50/60Hz ..VA
.....V,0.2 A .....kg
D-35614Asslar
Vacuum
chamber
Vacuum
chamber
WARNING
Contamination of transmitter 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.

11
Operation
6 Operation
6.1 Before switching on
After switching on the power supply, the transmitter is ready for operation. However, it is
advisable to wait for a stabilization period of 5-10 minutes before measurement, and to
operate the transmitter without interruption during the measurement process.
The measured pressure will depend on the type of gas. A suitable gas-type correction
factor for Pirani or cold cathode components can be set in the transmitter for the pressure
range below 0.1 mbar to adjust to different gases. The gas-type correction factor is fac-
tory set for air and N2at 1.00 (see p. 23, chap. 11.3).
Use of filament protection
shield
The transmitter can be operated without filament protection for standard UHV applica-
tions.
The shield supplied must be used for applications where increased contamination is ex-
pected. Ensure appropriate cleanliness when fitting. The transmitter conductance value
is lower with shield fitted. In this case, it should only be operated up to 1·10-5 mbar.
Insert filament protection shield 2 in transmitter flange 3 and press in with plastic stop-
per 1.
6.2 Baking out
1
2
3
CAUTION
Excessive bake-out temperature!
Risk of damage to electronics!
Remove electronics from sensor head prior to bake-out at bake-out temperatures >
60°C.
Note the arrangement of the components, do not interchange.
– The serial number of the unit is printed on the board to avoid confusion.

12
Operation
6.3 Switch on/off the BA sensor filament.
With this transmitter it is possible to switch the BA sensor filament on and off depending
on the process. According to the Communication Instructions this is possible with control
units DPG 109 (> V 1.40), DPG 101 (> V 1.60), via PC software DokuStar (> V 2.00) or
customer-specific equipment.
When the power is switched on, the "Filament" variable is "On" (preset) i.e. the HPT 100
works in Normal mode. Status changes of this variable during operation are only saved
temporarily. The status of the "Filament" variable can be changed at any time and will
remain saved until the power 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 mbar 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 DPG 101/DPG 109
See the Operating Instructions for the respective control unit for switching on/off the
sensor components.
Switching on/off the BA sensor during communication via RS-232 or 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 Ppac-
tual Effect on BA sensor
switched on "On" - No effect
switched off "On" ≥9·10-3 mbar Filament is switched on at
Pp<8·10-3 mbar
switched off "Off" ≥9·10-3 mbar Filament stays switched off at
Pp<8·10-3 mbar
switched on "Off" - Filament is switched off
switched off "On" ≤8·10-3 mbar Filament will be switched on and
the "Switch-on timer" started.1

13
Operation
6.4 Selecting switching range
Depending on the application, the HPT 100 transmitter enables the adjustment of the
switching range between Pirani and BA sensors to avoid
– the measuring value being used for control in the transition range or,
– in the case of coating applications, the hot cathode (BA) being switched on and pre-
maturely contaminated.
Fig. 8: Switching ranges HPT 100
Communication with DPG
101 or DPG 109 control
unit
Select switching ranges of the sensor components according to the operating manual
for the relevant control unit.
Communication via
RS-232 or RS-485
Select switching range:
– switch: transmit [P:049] with value <<000>>
– trans_LO: transmit [P:049] with value <<001>>
– trans_HI: transmit [P:049] with value <<002>>
SwMode
switch:
trans_LO:
trans_HI:
Direct switching at 4 · 10-4 mbar
(BA "On" at p ≤4 · 10-4 mbar)
(BA "Off" at p 6 · 10-4 mbar)
Overlapping at 1 ... 2 · 10-3 mbar
(BA "On" at p ≤3 · 10-3 mbar)
(BA "Off" at p > 4 · 10-3 mbar)
Overlapping at 2 ... 5 · 10-3 mbar
(BA "On" at p ≤8 · 10-3 mbar)
BA "Off" at p > 9 · 10-3 mbar
(Standard design)
Pirani-SensorBA-Sensor mbar

14
Operation
6.5 Configuring the data exchange
Communication is carried out, depending on the address selector switch setting, via the
serial RS-232 interface using the relevant display units or via RS-485 using the Pfeiffer
Vacuum protocol:
●9600 baud
●8 data bits
●1 stop bit
●no parity
Parameter overview
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
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 mbar, "750015" represents 7.500 x 10-5
mbar.
Reading error codes
[P:303] Parameter 303 transfers the actual error code of the transmitter. The following error
codes can occur:
Error codes
# Name Data type Handling
CPT 100
PPT 100
RPT 100 HPT 100
MPT 100
40 DeGas 6 - boolean_new readable, writable
•
41 Sensor on/off 7 - u_short_int readable, writable
• •
49 Switch mode 7 - u_short_int readable, writable
• • •
303 Actual error code 4 - string read-only
• • • • •
312 Software version 4 - string read-only
• • • • •
349 Component name 4 - string read-only
• • • • •
740 Pressure in [mbar] 10 - u_expo_new readable, condition-
ally writable
• • • • •
741 Pressure set point 7 - u_short_int only writable
• • • • •
742 Correction value
(Pirani)
2 - u_real readable, writable
• • • •
743 Correction value
(Bayard-Alpert)
2 - u_real readable, writable
•
743 Correction value
(CC sensor)
2 - u_real readable, writable
•
Value Meaning
"000000" No error
"Err001" Defective transmitter
"Err002" Defective memory

15
Operation
Reading component
names [P:349] Parameter 349 contains a logogram for the component name in accordance with the fol-
lowing table:
"....": means 4 blanks
Value Transmitter
".... A1" CPT 100
".... A2" RPT 100
".... A3" PPT 100
".... A4" HPT 100
".... A5" MPT 100

16
Operation
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 transmitter).
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

17
Operation
Activate/send parameter for low pressure (control command)
Low pressure adjustment (Parameter [P:741/740], Slave device address: "001")
Applied data types
6.7 Adjusting the transmitter
The transmitter is factory-calibrated. It may be necessary to calibrate the Pirani sensor
in the event of contamination, other installation positions, extreme temperature fluctua-
tions, ageing, etc. This is carried out using the "DokuStar" PC software via a connected
control unit or according to customer requirements following the communication instruc-
tions.
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 mbar.
– 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 equalization, the transmitter should be operated at the relevant pressure for ap-
prox. 5 ... 10 minutes long (warm-up time).
For correct zero point equalization, the pressure in the vacuum chamber must be below
1·10-5 mbar.
With controller
DPG 101/DPG 109:
Equalize the transmitter as described in the instructions for the control units.
Via RS-232/RS-485: Evacuate the vacuum chamber to the pressure p < 1·10-5 mbar.
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 mbar).
?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
Data type Description Size l1 - l0 Example
0 False / true 06 000000 / 111111
1 Positive integer number 06 000000 to 999999
2 Positive fixed comma number 06 001571 equal to 15.71
4 Symbol chain 06 TC_400
7 Positive integer number 03 000 to 999
10 Symbol chain 06 100023

18
Degas
7 Degas Deposits on the electrode system of the hot-cathode pipes 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 baking out the adsorbed gas
particles at a pressure below 2 ·10-6 mbar. This occurs by starting the degas process via
the connected measuring instrument, Windows software DokuStar or in accordance with
the Communication Instructions. The anode heats up to 800 °C through ohmic heating.
The baking out lasts approx. 3 minutes, but can be aborted at any time.
Whilst the transmitter is in Degas mode, no measuring value transmission is possible.
7.1 Switch on degas using control unit DPG 101/DPG 109:
Start degas process in accordance with the Operating Instructions for the respective
control unit.
7.2 Switch on degas via RS-232/RS-485:
Switch on degas process by sending [P:040] with value <<1>>.
Switch off degas process by sending [P:040] with value <<0>>.

19
Malfunctions
8 Malfunctions
8.1 Rectifying malfunctions
Problem Possible causes Remedy
Transmitter does not respond ●No supply voltage
●Wrong serial interface type or
incorrect address set
●Transmitter defective
Connect cable or power supply.
Set the address selector switch
to the serial interface to be used.
Replace transmitter.
The measurement value is too
large in the high vacuum
●High transmitter degassing
●Adjustment necessary
●Transmitter defective
Degas transmitter.
Re-adjust transmitter.
Replace transmitter.

20
Maintenance and service
9 Maintenance and service
The unit requires no maintenance. A damp cloth can be used to wipe away any external
dirt. Do make use of the Pfeiffer Vacuum service facilities. In the event that repairs are
necessary a number of options are available to ensure any system down time is kept to
minimum:
●Return the unit to the manufacturer for repairs;
●Replace with a new value unit.
Sending of units
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 Pfeiffer Vacuum
service address.
Include the confirmation on the service request from Pfeiffer Vacuum with your ship-
ment.
Fill out the declaration on contamination and include it in the shipment (required!).
Seal the contaminated unit in suitable protective film.
If possible, send unit in the original packaging.
Service orders
All service orders are carried out exclusively according to our repair conditions for vacu-
um units and components.
NOTE
The unit is not prepared for customer repair.
Units returned to us for repair or maintenance are covered by our general conditions of
sale and supply.
1) Forms under www.pfeiffer-vacuum.com