Bruker BVT3000 User manual

BRUKER

Version

Variable Temperature

Unit

Technical Manual

BVT3000

003

The information in this manual may be altered without notice.

BRUKER accepts no responsibility for actions taken as a result

of use of this manual. BRUKER accepts no liability for any mis-

takes contained in the manual, leading to coincidental damage,

whether during installation or operation of the instrument. Un-

authorised reproduction of manual contents, without written

permission from the publishers, or translation into another lan-

guage, either in full or in part, is forbidden.

This manual was written by

P. KRENCKER and D. PODADERA

Wissembourg, France

Manual P/N: Z31348

DWG-Nr: 1057003

BVT3000 Version 003 BRUKER 3 (67)

Contents

Contents ............................................................... 3

Index ..................................................................... 5

1 Description ............................................................. 7

1.1 Introduction ......................................................................... 7

1.2 BVT3000 main components ................................................. 8

1.3 Parts location ...................................................................... 9

1.4 Principle of operation ........................................................... 9

1.5 The front panel .................................................................. 10

1.6 Gas flow circuit .................................................................. 11

Setting up the gas flow ..................................................11

1.7 Front panel connectors ...................................................... 13

Heater connector ...........................................................13

Pt100 connector ............................................................14

Thermocouple connector ...............................................15

RS232 connector ...........................................................16

N2 connector (option) ....................................................17

BCU05 connector ..........................................................17

BVTB 3500 connector ....................................................18

2 Options ................................................................. 19

2.1 Auxiliary sensors module - BASM ...................................... 19

2.2 Manual Command Module - BMCM .................................... 20

2.3 Low temperature options ................................................... 20

2.4 Liquid nitrogen exchanger .................................................. 21

Exchanger presentation .................................................21

2.5 Liquid nitrogen evaporator ................................................. 22

Evaporator presentation .................................................22

2.6 BCU05 gas cooler ............................................................. 23

3 Configuration........................................................ 25

3.1 Sensor selection ................................................................ 25

3.2 Eurotherm 902 configuration .............................................. 25

4 Remote interface control...................................... 27

4.1 Microcontroller interface .................................................... 27

4.2 Digital interface specifications ........................................... 27

4.3 Commands and communication protocol ............................ 28

4.4 Control Characters ............................................................ 28

4.5 List of commands .............................................................. 29

4.6 Rs232 link characteristics .................................................. 30

4 (67) BRUKER BVT3000 Version 003

Contents

4.7 Rs232 cable ...................................................................... 30

4.8 Authorised functions .......................................................... 30

AF (Air flow) ..................................................................32

CM (Check memory for test only) ..................................33

CO (Communications speed) .........................................34

DL (Download) ..............................................................35

DT (DAC check for test only) .........................................36

ES (Error status) ...........................................................37

HP (Heater power) ........................................................38

IS (Interface status) .......................................................39

NH (Nitrogen heater) .....................................................40

NP (Nitrogen heater power) ...........................................41

P1 (Port 1 for test only) .................................................42

P2 (Port 2 for test only) .................................................43

P3 (Port 3 for test only) .................................................44

P4 (Port 4 for test only) .................................................45

RB (Read BBIS) ............................................................46

SV (Software version) ....................................................47

WB (Write BBIS) ...........................................................48

WR (Write record) .........................................................49

XR (Extract a record) .....................................................50

5 Technical specifications........................................51

5.1 Specifications ................................................................... 51

5.2 Security fuses ................................................................... 52

6 Schematics ............................................................53

Figures ................................................................. 63

Tables ................................................................... 65

BVT3000 Version 003 BRUKER 5 (67)

Index

BBIS eeprom....................................................................................................... 28

BCU05 gas cooler......................................................................................... 20, 23

digital interface specification............................................................................... 27

evaporator........................................................................................................... 17

exchanger ........................................................................................................... 17

fuses.................................................................................................................... 52

Gas flow indicator................................................................................................ 10

LN2 evaporator ................................................................................................... 20

remote interface control ...................................................................................... 27

Sensor selection.................................................................................................. 25

Temperature controller.......................................................................................... 7

thermocouple ........................................................................................................ 9

6 (67) BRUKER BVT3000 Version 003

Index

BVT3000 Version 003 BRUKER 7 (67)

Description 1

Introduction 1.1

The new variable temperature unit BVT3000 for precise sample temperature reg-

ulation is equiped with a microcontroller interface for remote control by the host

computer. The BVT3000 is manufactured in a separate housing.

The unit includes:

- A main board called interface board with a microcontroller.

- A temperature controller (EUROTHERM mode 902).

- A main transformer that supplies the microcontroller and its electronics and the

optoisolated power stage of the probe heater.

- The gas flow circuitry (pressure regulator and a block of four valves for gas flow

control).

- An option printed circuit for liquid nitrogen heater evaporator control or liquid ni-

trogen exchanger.

This temperature unit can be used with NMR spectrometers or ESR spectrome-

ters.

For ESR the thermocouple connector is a K type.

8 (67) BRUKER BVT3000 Version 003

Description

Figure 1.1. BVT3000 block diagram

BVT3000 main components 1.2

The interface board has a microcontroller for remote control of the BVT3000. Two

RS232 links are on this printed circuit. One link, on the front panel side, is for the

communication with host computer and the other for communication with the Eu-

rotherm 902 temperature controller.

A main toric transformer supplies the different groups. On the rear panel there is a

power supply plug. The thyristor bridge, for control of heater power, is also

housed in the rear panel. On the front panel a gas flow indicator (with a steel ball)

detects the gas flow. A device called valve block (a system of 4 valves) deter-

mines the gas flow and is under software control.

thermocouple

and Pt100

connector

RS232

Host computer

connector

probe heater

connector BCU05

connector Gas

inlet outlet

Gas N2

option board for

LN2 evaporator

or exchanger

main

transformer

ac line

filter

Eurotherm

controller

microcontroller POWER

CONTROL

& SECURITIES

OPTO-

COUPLERS

RAM

EPROM RS232

BUFF VALVE

BLOCK GAS FLOW

DETECTION

PRESSURE

REGULATOR FLOW

INDICATOR

BVT3000 Version 003 BRUKER 9 (67)

Parts location

Parts location 1.3

Figure 1.2. Parts location

Principle of operation 1.4

The sample is heated by a constant gas flow delivered by the BVT3000. A tem-

perature sensor (e.g. a thermocouple) located under the sample tube measures

the gas temperature. The temperature controller compares the probe temperature

to the target temperature programmed by the operator, and regulates the power

applied to the heater in order to stabilise the gas temperature. A special detector

monitors the gas flow and switches off the heater power if the gas flow is missing.

A security thermocouple checks also the heater temperature and avoids probe

overheating.

main transformer

heater filter coil

thyristor bridge

mains plug

line switch gas flow indicator

main board

valve

block

pressure regulator

TEMPERATURE

CONTROLLER

OPTION

LN2

EVAPORATOR

EXCHANGER

10 (67) BRUKER BVT3000 Version 003

Description

The front panel 1.5

On the front panel, there is:

1: Auxiliary sensors

2: Gas out

3: Gas inlet

4: Pt100 connector or BTO2000

5: Power switch

6: RS232 connector

7: Heater connector

8: BCU05 connector

9: N2 connector

10: Gas flow indicator

11: BTO2000 power supply or BVTB 3500

12: Thermocouple connector type T

13: Eurotherm controller

Figure 1.3. BVT3000 front panel

RS 232

EUROTHERM

HEATER

GAS OUT GAS IN

PT100

GAS F LOW

TCopp er +

Cons t . -

BCU05 N2

AUXILIARY SENSORS

SENSOR

BTO P.S. or

BVTB 3500

POWER

BVT 3000

DIGITAL

2 3 41

578

10 11 12 1396

Table of contents

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