BUSCH VACTEST DTP 400 C User manual

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Instruction Manual
VACTEST
Vacuum Measurement Equipment
Digital Transmitter DTP 400
Digital Transmitter DTP 400 C
0870205259/-0001_en / Original instructions / Modifications reserved 16/09/2021

Table of Contents
2 / 24 Instruction Manual VACTEST DTP 400_EN_en
Table of Contents
1 Safety .......................................................................................................................................3
2 Product Description ..................................................................................................................4
2.1 Interface Illustration ......................................................................................................... 4
2.2 Product Identification ....................................................................................................... 4
2.3 Delivery Content .............................................................................................................. 4
2.4 Proper Use ....................................................................................................................... 4
2.5 Improper Use ................................................................................................................... 4
3 Transport and Storage...............................................................................................................5
4 Installation................................................................................................................................5
4.1 Installation Conditions...................................................................................................... 5
4.2 Vacuum Connection......................................................................................................... 5
4.3 Electrical Connection ........................................................................................................ 7
4.3.1 Connecting to the Active Sensor Controller ........................................................... 7
4.3.2 Connecting to the USB/RS485 Converter .............................................................. 8
4.3.3 I/O and Communication Port Schematic ............................................................... 9
4.4 Change Display Unit and Orientation (Display version only)............................................. 10
5 Operation .................................................................................................................................10
5.1 Before Operation ............................................................................................................. 10
5.2 Operating the Gauge ....................................................................................................... 11
5.2.1 Operating Flowchart ............................................................................................. 11
5.3 Setpoints .......................................................................................................................... 12
5.4 Bake-out .......................................................................................................................... 13
5.5 Readjustment ................................................................................................................... 13
5.5.1 Readjustment by Pushbutton................................................................................. 13
5.5.2 Readjustment via Software Command...................................................................14
5.5.3 Readjustment via Controller .................................................................................. 14
6 Communication ........................................................................................................................14
6.1 Setting RS485 Address ..................................................................................................... 14
6.2 Commands Overview....................................................................................................... 15
6.2.1 Setpoints ............................................................................................................... 17
6.2.2 Readjustment ........................................................................................................ 17
6.3 VacTest Explorer Software................................................................................................ 18
7 Maintenance and Service..........................................................................................................18
7.1 Replacing the Sensor Head............................................................................................... 18
8 Troubleshooting .......................................................................................................................19
9 Spare Parts and Accessories......................................................................................................20
10 Technical Data..........................................................................................................................21
10.1 Gas Correction Factor....................................................................................................... 22
11 EU Declaration of Conformity...................................................................................................23

Safety | 1
Instruction Manual VACTEST DTP 400_EN_en 3 / 24
1 Safety
• Read and follow the instructions of this manual.
• Inform yourself regarding hazards, which can be caused by the product or arise in
your system.
• Comply with all safety instructions and regulations for accident prevention.
• Check regularly that all safety requirements are being complied with.
• Take account of the ambient conditions when installing your gauge. The protection
class is IP 40 (the unit is protected against penetration of foreign bodies) or IP 54
when using suitable electrical connectors.
• Adhere to the applicable regulations and take the necessary precautions for the pro-
cess media used.
• Consider possible reactions between materials and process media.
• Consider possible reactions of the process media due to the heat generated by the
product.
• Before you start working, find out whether any of the vacuum components are con-
taminated.
• Adhere to the relevant regulations and take the necessary precautions when handling
contaminated parts.
• Communicate the safety instructions to other users.
This instruction manual highlights potential hazards where appropriate. Safety notes and
warning messages are tagged with one of the keywords DANGER, WARNING, CAU-
TION, NOTICE and NOTE as follows:
DANGER
... indicates an imminent dangerous situation that will result in death or serious injuries if
not prevented.
WARNING
... indicates a potentially dangerous situation that could result in death or serious injuries.
CAUTION
... indicates a potentially dangerous situation that could result in minor injuries.
NOTICE
... indicates a potentially dangerous situation that could result in damage to property.
NOTE
... indicates helpful tips and recommendations, as well as information for efficient and
trouble-free operation.

2 | Product Description
4 / 24 Instruction Manual VACTEST DTP 400_EN_en
2 Product Description
The digital transmitter DTP 400 or DTP 400 C is a spiral coil filament Pirani sensor whose
measurement principle is based on the thermal conductivity of gases.
This sensor type provides indirect pressure measurements which are dependent on the
gas nature.
The DTP 400 C is equipped with a Platinum / Rhodium filament for better resistance to
corrosion.
The DTP 400 D or DTP 400 DC is the same gauge but equipped with a LCD display.
2.1 Interface Illustration
13
5
7
9
11
13
15
RS485 Stat Adj SP1 SP2
RS485 / 0-10V / Relay
18
159
Address selector
switch Status-LED
Pushbutton
Setpoint LEDs
2.2 Product Identification
The product model can be found on the product's nameplate. Technical modifications
are reserved without prior notification.
2.3 Delivery Content
Included in the delivery consignment are:
– Digital transmitter DTP 400 or DTP 400 C
– Protective cover
– Instruction manual
Available accessories, consult the chapter Spare Parts and Accessories [►20].
2.4 Proper Use
The DTP 400 or DTP 400 C serves exclusively to measure total pressure in a range of:
– 1000…1 x 10-4 mbar for DTP 400
– 1000…5 x 10-4 mbar for DTP 400 C
2.5 Improper Use
The use for purposes not mentioned above is regarded as improper, 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.

Transport and Storage | 3
Instruction Manual VACTEST DTP 400_EN_en 5 / 24
– Operation of the devices in areas with ionizing radiation.
No liability or warranty will be accepted for claims arising from improper use.
3 Transport and Storage
• Check the device for transport damage.
NOTICE
Devices without external protection.
Risk of damage to the device!
• The device must not come into contact with electrostatically chargeable materials and
must not be moved within electrical or high magnetic fields.
If a storage is planned:
• Seal the vacuum flange with the protective cover.
• Comply with the storage temperatures, see technical data.
• In rooms with moist or aggressive atmospheres, the device must be airproof shrink-
wrapped in a plastic bag together with a bag a desiccant.
4 Installation
CAUTION
Unauthorized modifications.
Risk to injury!
• Modifications or conversions of the gauge are not allowed.
4.1 Installation Conditions
• Make sure that the environment of the device is not potentially explosive.
• Make sure that the ambient conditions comply with the Technical Data [►21].
4.2 Vacuum Connection
CAUTION
Unintended opening of clamp with an overpressure in the vacuum system over 1000
mbar.
Risk to injury!
Damage to your health!
• Parts may fly around.
• Unsecured hose connections can release process media.

4 | Installation
6 / 24 Instruction Manual VACTEST DTP 400_EN_en
CAUTION
Overpressure in the vacuum system over 1500 mbar
Damage to your health!
The elastomer washers cannot withstand the pressure and can release process media.
• Use sealing rings with an outer centering ring.
NOTICE
Dirt and damage at the vacuum flange.
Impair the function of the gauge!
• Make sure that the flange is clean, dry and free of grease.
• When handling the instrument, make sure that the flange is protected against dirt and
damage.
• Remove the protective cover (is required again during maintenance work!).
• Connect the flange to the system.
Connection size:
– ISO KF 16
• Make sure that the sensor flange is connected to the ground.
Mounting position:
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.
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Installation | 4
Instruction Manual VACTEST DTP 400_EN_en 7 / 24
4.3 Electrical Connection
NOTICE
Establish a connection using a live cable.
Risk of damage to the device!
• Only connect cables when de-energised.
4.3.1 Connecting to the Active Sensor Controller
For operation of the gauge with controller, a suitable measurement connection cable
must be used (see accessories).
SET
VacTest
www.buschvacuum.com
Active sensor
controller
CTR 002
CTR 004
D-SUB Cables
Transmitters
With the controller CTR 002: up to 2 gauges can be connected.
With the controller CTR 004: up to 4 gauges can be connected.
USB
• Set the relevant address at the address selector switch, see Setting RS485 Address
[►14].
• Connect the D-Sub connector to the gauge and secure it with the screws.
• Connect the controller and secure the D-Sub connector with the screws.
• Switch on the controller.

4 | Installation
8 / 24 Instruction Manual VACTEST DTP 400_EN_en
4.3.2 Connecting to the USB/RS485 Converter
Transmitter
USB/RS485
Converter
24 VDC
• Set the relevant address at the address selector switch, see Setting RS485 Address
[►14].
• Connect the gauge to the power supply cable.
• Connect the USB/RS485 converter and secure the D-Sub connector with the screws.
• Connect the power supply cable to the mains.

Installation | 4
Instruction Manual VACTEST DTP 400_EN_en 9 / 24
4.3.3 I/O and Communication Port Schematic
The electrical connection is to be made by means of suitable cables considering EMI de-
mands and according to the pin description shown below:
Connector: D-Sub15, 15-pin, male
18
159
Pin no. Description Pin no. Description
1 Identification 2 Signal Output 0 … 10 VDC
3 AGND 4 Voltage Supply 24 VDC
5 Supply GND 6 Relay 1, NO (normally open)
7 Relay 1, Common 8 Relay 1, NC (normally closed)
9 N/A 10 RS485, D+
11 RS485, D- 12 Ground
13 Relay 2, NO (normally open) 14 Relay 2, Common
15 Relay 2, NC (normally closed)
NOTE
We recommend to have "Ground" (Pin 12) and supply common (Pin 5) grounded.
NOTICE
Incorrect supply voltage.
Risk of damage to the device!
• Make sure to supply a correct and admissible voltage.

5 | Operation
10 / 24 Instruction Manual VACTEST DTP 400_EN_en
4.4 Change Display Unit and Orientation
(Display version only)
In order to change the display unit (mbar, Torr, hPa):
• Hold the "Adj" pushbuton pressed while connecting power supply until the display
shows "Unit".
• Select the desired unit by pressing the "Adj" pushbuton.
Display unit and orientation can be changed via VacTest explorer or by software com-
mand, see chapterCommands Overview [►15].
5 Operation
For DTP 400 C (version for corrosive application):
NOTICE
Aggressive media such as fluorides.
Reduce sensor life-time!
• Furthermore, dust, oil or condensing vapours will affect sensor performance and may
cause malfunction.
For DTP 400 (standard version):
NOTICE
Aggressive media such as fluorides, halogenides, carbon, oxygen plasma and all other
corrosive media.
Reduce sensor life-time!
• Furthermore, dust, oil or condensing vapours will affect sensor performance and may
cause malfunction.
5.1 Before Operation
Warm-Up Time
The signal output of the gauge is available approx. 2 seconds after the unit is switched
on.
To take advantage of the maximum accuracy of the unit it is advisable to wait 5 ... 10
minutes for stabilization before measurement.
Dependence On Gas Type
The measured pressure will depend on composition and type of gas. The gauge is factory
calibrated for N2 and dry air.
To adjust to other gases, a suitable correction factor for the Pirani sensor can be set in
the gauge for the pressure range below 0.1 mbar, see Gas Correction Factor [►22].