Pfeiffer Vacuum DPG 202 User manual

PG 0030 BEN/E (1605)
OPERATING INSTRUCTIONS EN
Translation of the original instructions
DPG 202
Controller

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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.3 Improper use. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3 Transport and storage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4 Product description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4.1 Product identification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4.2 Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4.3 Range of application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
5 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5.1 Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5.2 Connecting to the mains power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5.3 Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
5.4 Configuring the data exchange . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5.5 Pfeiffer Vacuum Protocol for "RS-485" . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
6 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
6.1 Switching on . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
6.2 Measuring mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
6.3 Menu overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
6.4 Configuration mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
7 Malfunctions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
7.1 Rectifying malfunctions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
8 Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
9 Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
10 Technical data and dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
10.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
10.2 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
10.3 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Declaration of conformity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

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.
DANGER
Imminent danger
Indicates an imminent hazardous situation that will result in death or serious injury.
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

4
Safety
Abbreviations CPT: Digital Piezo gauge
PPT: Digital Pirani gauge
RPT: Digital Piezo/Pirani gauge
HPT: Digital Pirani/Bayard-Alpert gauge
MPT: Digital Pirani/Cold Cathode gauge
DPG: Control unit
CC sensor: Cold cathode sensor
BA sensor: Bayard-Alpert sensor
2Safety
2.1 Safety precautions
●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 20. Take necessary measures
when installing into ambient conditions, which afford other protection classes.
●Do not modify or alter the unit yourself.
●Ensure specified mains voltage.
●Note the shipping instructions, when returning the unit.
●Communicate the safety instructions to other users.
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.
Installation and operation of accessories
Pfeiffer Vacuum pumps can be equipped with a series of adapted accessories. The in-
stallation, operation and maintenance of connected devices are described in detail in
the operating instructions of the individual components.
For information on order numbers of components, see "Accessories".
Use original accessory parts only.

Transport and storage
5
2.2 Proper use
●The DPG 202 controler is used exclusively for connecting DigiLine gauges, e. g. CPT
100/200, RPT 100/200, PPT 100/200, HPT 100/200 and MPT 100/200.
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 mains supplies, which do not confirm to the regulations IEC 61010 or
IEC 60950
●connection to units which have exposed voltage-carrying parts
●connection to pumps or units which are not suitable for this purpose according to their
operating instructions
●operation of the devices in areas with ionizing radiation
3 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.
NOTICE
EC conformity
The manufacturer's declaration of conformity becomes invalid if the operator modifies
the original product or installs additional components.
Following installation into a plant and before commissioning, the operator must check
the entire system for compliance with the valid EU directives and reassess it accord-
ingly.

6
Product description
4 Product description
The DPG 202 controller is used in conjunction with the Pfeiffer Vacuum DigiLine gauges
for measurement and control total pressures. The unit is ready to connect the gauges
CPT 100/200, RPT 100/200, PPT 100/200, HPT 100/200 and MPT 100/200.
4.1 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:
– DPG 202
– Mating plugs for relay outputs
– Operating instructions
– Fixing screws for rack installation
– USB cable
4.2 Function
Fig. 2: Frontpanel and rear view DPG 202
Mod.:
Mod. No.:
Input:
Output:.
Weight:
Ser. No.: 42000303
DPG 202
PT G12 020
95 - 265 V, 50/60Hz, 25 VA
= 24 V, 1.0 A
0.75 kg
D-35614 Asslar
1 Display for presssure values
(mbar, bar, mTorr, Torr, hPa, Pa),
2 Menu key
3Setkey
4 Up-/Down keys
6 Mains switch S1
7 Mains connection
8 Gauge input
9 USB port
10 Relay output (SP1, SP2)
set
DPG 202
V
A
UU
M
C
4
8
1
2
3
10
9
6
7
Sensor
RS-485
SP1
SP2
USB
S1

Product description
7
4.3 Range of application
The unit DPG 202 must be installed and operated in the following ambient conditions:
Installation location weather protected (indoor)
Protection class IP 20
Installation altitude max. 2000 m
Ambient temperature +5°C to +50°C
Relative humidity 5 ... 85 %, non-condensing
Atmospheric pressure 860 hPa - 1060 hPa

8
Installation
5 Installation
5.1 Assembly
Rack installation The unit is fitted in a casing that is suitable for installation in 19"/3HE rack modules.
Insert the unit in the guiderails of a 19"/3HE rack and screw on the front panel secure-
ly with four fixing screws provided as part of the scope of supply.
5.2 Connecting to the mains power supply
The DPG 202 is equipped with an universal power supply with an input voltage range of
95 ... 265 V AC.
NOTICE
Ensure free convection
Incorrect installation can cause damage by over-heating or create a fire hazard.
Maintain a minimum distance of 50 mm from cooling vents to adjacent components
or boundaries.
Install the device upright.
CAUTION
Excess voltage!
Danger of destroying the unit.
Power connections must comply with local regulations. Voltage information given on
the rating plate must correspond to the mains voltage values.
Use only cable with protective earth conductor.
To protect the electronics and the power supply cable in case of failure provide an
appropriate network safety device.
WARNING
Danger of unsafe electrical installation
Safe operation after installation is the responsibility of the operator.
Do not independently modify or change the pump and electrical equipment.
Make sure that the system is integrated in an emergency off safety circuit.
Consult Pfeiffer Vacuum for special requirements.
WARNING
Danger of electric shock
In case of defect, the parts connected to the mains supply are under voltage.
Always keep the mains connection freely accessible so you can disconnect it at any
time.

Installation
9
Mains connection
socket
If the unit is installed in a rack, the mains voltage must be supplied via a switched power
distributor.
Order the mains cable separately (see "accessories").
Switch off switch S1 on the power pack (position "0").
Connect the mains cable to the mains.
Always ensure a safe connection to the protective earthing conductor (PE, protection
class III).
5.3 Connections
Communication is effected via Serial Interface RS-485 (address settable from 1...2).
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.
S1
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

10
Installation
Connecting the
gauge to the DPG 202
controller
Set the address selector switch at the gauge to the required address (default setting:
"1").
Connect the gauge to the control unit using the connection cable.
Switch on the control unit.
Fig. 4: Connections diagram gauge/DPG 202
Connect unit interface to the PC’s USB interface.
Note! Drivers and installation instructions can be downloaded from www.pfeiffer-Vacu-
um.com.
RS-485
M12 socket with screw coupling for the connection of a DigiLine gauge. The use of a Y-
connector enables the connection of a second gauge.
Relay output The relay output provides two switching functions for external control.
Representation of the contacts in a state of rest, i.e.: Switch function = "off"
Table 1: Phoenix Combicon, 6 pole (male)
USB
RS-485
set
DPG 202
V
A
UU
M
C
12 12
12
34
5
Pin Assignment
1 RS-485: D+
2+24V
3GND
4 RS-485: D-
5 not connected
NOTICE
Damage to the product
Only connect cables when de-energized.
Never establish a connection using a live cable.
SP1
SP2
Pin Assignment
SP1 Relay output 1/max. 2 A
SP2 Relay output 2/max. 2 A

Installation
11
5.4 Configuring the data exchange
●9600 baud
●8 data bits
●1 stop bit
●no parity
5.5 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 
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

12
Installation
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")
Activate/send parameter for low pressure (control command)
Low pressure adjustment (Parameter [P:741/740], Slave device address: "001")
Activating the key-
board lock [P:008] The keyboard lock for the set key can be activated/deactivated using the parameter
[P:008].
Send telegram according table " Telegram examples" to the DPG 202. The unit ad-
dress of the DPG 202 is factory set to 016 and cannot be changed.
Table 2: Telegram examples
Reading the software
version [P:312] The software version can be read from the connected device using parameter 312:
●Example: 010100
Reading the compo-
nent names [P:349] Parameter 349 contains a token of the component name:
●DPG 202
?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
?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
Handling Telegram to DPG 202 Telegram from DPG 202 Unit adress
Keyboard lock
"on"
01610000806111111028CR01610000806111111028CR016
Keyboard lock
"off"
01610000806000000022CR01610000806000000022CR016

Operation
13
6Operation
6.1 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.
Switch on power supply using switch S1 on the mains pack.
WARNING
Maintain safe work conditions
The device described here is operated with mains voltage.
Before opening the device, cut off the voltage supply and secure it to prevent it from
being switched on unintentionally.
The DPG 202 carries out a self test and the following appears
on the display:
– software version number,
– the connected total pressure gauges are automatically iden-
tified,
– the start menu PRESSURE with the actual pressure value
appears in the display.
– The current gauge parameters are imported.
DPG 202 is ready
– On channel 1, a gauge has been detected and a pressure of
1000 hPa is displayed.
– On channel 2, no gauge has been detected.
V010100
V010100
hPa
PRESSURE
REL: 1 2
DPG 202
Scan...
CH1: 1000
CH2: noSensor

14
Operation
More possible dis-
plays
Switching off
noSensor
The unit was not able to communicate with a gauge.
Possible causes:
●No gauge is connected.
●The address selection switch of the gauge has not been set
on a RS-485 address 1 or 2.
●The data line between the DPG 202 and gauge is not cor-
rectly connected or is faulty.
●The serial interface in the DPG 202 is defective.
ur/or
The measured pressure is outside the measurement range of
the gauge.
–ur = under range; pressure lower than lowest limit
–or = overrange; pressure higher than highest limit
Err1
The connected gauge is defective.
< 1·10-4
This display indicates the filament of the BA sensor or the CC
sensor is switched off in case of the HPT or MPT gauge, re-
spectively.
The measured pressure with the Pirani sensor is currently
<1.0·10-4 (ur of the Pirani sensor). If the pressure rises up to
the Pirani sensors measuring range, the value is measured and
displayed.
hPa
PRESSURE
REL: 12
CH1: noSensor
CH2: noSensor
hPa
PRESSURE
REL: 12
CH1: ur/or
CH2: ur/or
hPa
PRESSURE
REL: 12
CH1: Err1
CH2: Err1
hPa
PRESSURE
REL: 12
< 1.0·10 - 4
Switching off
The DPG 202 can be switched off in any operating mode.
The keyboard lock is activated (indicated with a lock sign) until
the DPG 202 is switched off.
hPa
PRESSURE
REL: 1 2
CH1: 1005
CH2: noSensor

Operation
15
6.2 Measuring mode
In measuring mode the DPG 202 shows the pressure of the connected gauge currently
being measured. The display appears, depending on the measurement range, either in
fixed-point or exponential notation. The switch outputs are controlled in accordance with
the set point parameters and actual pressure.
If the communication is interrupted, noSensor appears on the display.
In such a case reinitialize the unit by a scan (COMMON MENU).

16
Operation
6.3 Menu overview
Press the Menu key to access the configuration mode. The following menus can be se-
lected:
PRESSURE MENU
After switching on, the DPG 202 is in the start menu PRES-
SURE. Here, the pressure value with the respective channel
number, the pressure unit and the status of the two switching
relays are displayed.
CHANNEL MENU
This menu shows specific data for the selected channel (gauge
type, gas type and correction factor). In addition there is also
the function to select adjust for the respective sensors.
SENSOR MENU
Here the specific sensor data of the current channel is dis-
played (type of gauge, sensor setup and the crossover setting
of the combi gauges). The function degas is only possible on
total pressure gauges using the hot cathode sensor.
RELAY MENU
This menu shows the respective parameters for the selected
relay (channel assignment, set value and hysteresis with pres-
sure unit). The current setting of the two switching relays is also
displayed.
– big digit = relay on
– small digit = relay off
SET POINTS
In this menu the two set points for the connected gauge can be
set. This menu is only active when a transmitter with analog/re-
lay option is connected.
COMMON MENU
Here the pressure unit can be selected. In addition, there is the
option to switch on and off the display backlight (the lighting is
always activated when the unit is switched on). In AutoOff
mode the display backlight is automatically switched off if no
key is pressed for 20 s.
By scanOn a new recognition of the connected gauges can be
forced. During the scan the status of the relays does not
change, until the pressure values have been updated.
hPa
PRESSURE
REL: 1 2
CH1: 1005
CH2: notr
ch: 1
CHANNEL MENU
type: RPT 200 V010100
gas: N2/O2/CO/Air
corr: 1.00PI
adjust
ch: 1
SENSOR MENU
type: RPT 200 V010100
SwMode: switch
rel: 1 2
ch:
1
RELAY MENU
chann: ch1
press: 10 hPa
hyst: 2.0 hPa
pressure unit: hPa
backlight: On
scan: O
COMMON MENU
ch: 1
SET POINTS
SP1: 10 hPa
SP2: 2.0 hPa

Operation
17
6.4 Configuration mode
set key: Settings are accepted, cursor jumps to next parameter.
Up/Down keys: Values are selected.
Menu key: Next menu will be displayed.
Gas type correction
factor For total pressure gauges employing a measuring method which is dependent on the
type of gas, a correction factor can be assigned to the gauge. This will ensure, for a se-
lected gas, the pressure display is corrected in a broad pressure range. On a combi-
gauge such as the HPT 200 and the MPT 200 with two different measurement methods
two correction factors are necessary (see the operating instructions for the gauge).
set
CHANNEL MENU
ch: 1: Channel number
type: Identified gauge type on channel 1 (e.g. HPT 200)
gas: Set gas type for the selected gauge
corr: Preset correction factor for the selected gauge
adjust: Adjustment of range limits
CHANNEL MENU
1. Preprogrammed gas types:
The relevant correction factor will be displayed automatically at
the parameter corr:
gas:N2/O2/CO/Air, CO2, H2, He, Ar, user
Select the required gas type with Up/Down at the parameter
gas.
Confirm with set key.
CHANNEL MENU
2. Individual correction factor:
Select user specific correction factor with Up/Down at the
parameter corr. After altering a preset correction factor at
the parameter gas the display will change to user.
To set a gas specific correction factor, enter a value in the
range of 0.2 – 8.0.
ch: 1CHANNEL MENU
type: ...
gas: user
corr: 2.00
adjust
set
ch: 1CHANNEL MENU
type: ...
gas: N2/O2/CO/Air
corr: 1.00PI 1.00BA
adjust
set
ch: 1CHANNEL MENU
type: HPT 200 V010100
gas: N2/O2/CO/Air
corr: 1.00PI 1.00BA
adjust
set

18
Operation
Re-adjusting For zero adjustment, ensure the pressure in the vacuum chamber is at least one decade
below the measuring range of the gauge and is not subject to large pressure fluctuations.
Bring gauge up to operating temperature (≥5 minutes).
(*) The reference pressure can only be entered in the measurement units mbar, hPa or Torr. If, for
example the unit bar is selected, for reference pressure input purposes there is a temporary switch
over to mbar, with mTorr to Torr and with Pa to hPa. When adjustment has been completed the orig-
inally selected pressure unit is again active.
(**) These points are only required for atmospheric pressure adjustment of CPT100/200 and the
RPT100/200.
CHANNEL MENU
Press set key until the cursor flashes at the parameter ad-
just.
Press the Up-key; HI is displayed at the cursor position.
Note: Within the limits of 800 to 1200 hPa the gauge can be ad-
justed to atmospheric pressure.
After pressing the set key the display shows the preset ref-
erence value (*)/(**).
Set the actual atmospheric pressure with the Up-/Down
keys (**).
By pressing the set key the new value is taken into account,
and the cursor jumps back to the channel number ch.
Successful adjustment is prompted by o.k.; if not o.k. is dis-
played the gauge could not be adjusted.
Set the zero adjustment LO in the same way.
Note: When adjusting zero LO, ensure that the reference pres-
sure in the vacuum chamber is at least one decade below the
measuring range of the gauge.
ch: 1CHANNEL MENU
type: ...
gas: ...
corr: ...
adjust
ch: 1CHANNEL MENU
type: ...
gas: ...
corr: ...
adjust: HI/LO
HI
HI
LO
set
set
LO
set
ch: 1CHANNEL MENU
type: ...
gas: ...
corr: ...
adjust o.k. 995 mbar
set

Operation
19
Sensor menu Total pressure gauges with hot cathode sensor (e.g. HPT 200 ) may need baking in ultra
high vacuum to desorp the gasload from surfaces. The degas process lasts for three
minutes by default but can be stopped manually at any time. Pressure reading with re-
duced accuracy is possible during degas, the PRESSURE menu shows degas for the
concerned channel as long as the operation proceeds.
In the sensor menu the type dependent functions of the combination gauges RPT 100/
200, HPT 100/200, and MPT 100/200 can be selected. The settings are described here-
under taking the HPT 200 as an example.
SENSOR MENU
The high vacuum sensors of the combined gauges HPT 200
and MPT 200 can be switched manually:
–BAFil = Filament of the BA sensor
–CCSens = Cold cathode sensor
Press set key until the cursor flashes at the parameter BA-
Fil; the status of the function will be displayed (On or Off).
Switch filament On or Off using the Up/Down keys.
Confirm with set key.
For the HPT 200 gauge the value in brackets define the select-
ed filament:
Select 1, 2or auto.
Confirm with set key.
If autois selected, an automatic switchover to the other filament
takes place when necessary (in case of wear).
For the MPT 200 gauge CCSens appears instead of BAFil.
Switch sensor on or off using the Up/Down keys.
Confirm with set key.
Select switching mode for combination gauges:
Press set key until the cursor flashes at the parameter
SwMode; the status of the function will be displayed
(trans_Hi, trans_Lo or switch, depending on the type of
gauge).
Use Up/Down key to select the desired function.
Confirm with set key.
Activate the degas function:
The function degas is only possible for total pressure gauges
with hot cathode sensor (HPT 100/200).
Press set key until the cursor flashes at the parameter de-
gas. The status of the degas function will be displayed (Off
or On).
Use the Up key to select degas On.
Start the degas process with the set key.
The degas process can be manually deactivated at any time by
switching the degas function to Off:
Press the set key until the cursor flashes at the parameter
degas.
Select the function Off with the Down key.
Switch off the degas process with the set key.
ch: 1SENSOR MENU
type: HPT200 V010100
BAFil[1/2/auto]: On/O
SwMode: trans_hi
degas: O
SENSOR MENU
...
BAFil[auto]: On/O
...
...
SENSOR MENU
...
...
SwMode: trans_hi/lo/switch
...
set
set
set
set
SENSOR MENU
...
...
...
degas: On/O

20
Operation
Relay menu Set the threshhold and hysteresis values
The two relays are controlled by the two set points SP1 and SP2 (parameter press) and
associated hysteresis H1 and H2 (parameter hsyt), as depicted in the illustration.
Fig. 5: Pressure and relay status curves illustrating threshold values and hysteresis
t
H
SP
0
1
p