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
© September 7, 1998: Bruker SA
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
B
BBIS eeprom....................................................................................................... 28
BCU05 gas cooler......................................................................................... 20, 23
D
digital interface specification............................................................................... 27
E
evaporator........................................................................................................... 17
exchanger ........................................................................................................... 17
F
fuses.................................................................................................................... 52
G
Gas flow indicator................................................................................................ 10
L
LN2 evaporator ................................................................................................... 20
R
remote interface control ...................................................................................... 27
S
Sensor selection.................................................................................................. 25
T
Temperature controller.......................................................................................... 7
thermocouple ........................................................................................................ 9

6 (67) BRUKER BVT3000 Version 003
Index

BVT3000 Version 003 BRUKER 7 (67)
1
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
0
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
0
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
0
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

BVT3000 Version 003 BRUKER 11 (67)
Gas flow circuit
Gas flow circuit 1.6
On the rear panel a pressure regulator delivers gas at constant pressure to a
group of valves. Each valve, when open, allows the gas to flow through a calibrat-
ed hole. As all valves are in parallel, it is possible to obtain 15 different gas flow
rates.
The regulator is factory-adjusted to obtain approximately 2000 l/h when all valves
are open.
The default value at «POWER ON» can be changed by hardware jumpers (JP6 to
JP9) see figure
"Valve jumpers settings" on page 45 .
On the front panel a gas flow meter with a steel ball indicates the actual gas flow.
An optical barrier at the bottom detects a missing gas flow.
Figure 1.4. Gas flow circuit
Settingupthegasflow 1.6.1
Connect the BVT3000 gas input to a dry air or N2 gas line. The input pressure
should be at least 4 bar and must not exceed 8 bar. Power on the BVT3000. The
default value of the flow rate is set according to the position of jumper JP6 to JP8.
The gas flow rate can also be changed by software in the «EDTE» program.
GAS
FLOW
SENSOR
GAS FLOW REDUCERPRESSURE REGULATOR
GAS IN
VALVE CONTROL
VALVE
GAS OUT
VALVE BLOCK

12 (67) BRUKER BVT3000 Version 003
Description
Table 1.1. Flow rate versus command
Decimal
combination Combination ABCD Flow rate (l/h)
0 0000 0
1 0001 135
2 0010 270
3 0011 400
4 0100 535
5 0101 670
6 0110 800
7 0111 935
8 1000 1070
9 1001 1200
10 1010 1335
11 1011 1470
12 1100 1600
13 1101 1735
14 1110 1870
15 1111 2000

BVT3000 Version 003 BRUKER 13 (67)
Front panel connectors
Front panel connectors 1.7
Heater connector 1.7.1
The heater is plugged into this connector. A safety thermocouple is located close
to the heater resistance in order to detect an overheating in the case of a missing
gas flow for example.
Figure 1.5. Heater connector (Front view)
Table 1.2. Heater connector pin assignment
PIN 7 pins NMR 8 pins ESR
1 heater + heater +
2 heater + NC
3 security thermocouple + heater -
4 security thermocouple - security thermocouple +
5 heater - security thermocouple -
6 heater - GND
7 gnd heater +
8 / heater -
43
2
16
57
54
1
7
8
36
2
NMR ESR

14 (67) BRUKER BVT3000 Version 003
Description
Pt100 connector 1.7.2
Figure 1.6. Pt100 connector (Front view)
Table 1.3. Pt100 connector pin assignment
Note : This connector is also used to connect the BTO2000. Pin 2 and 3 are used
as signal input pins.
PIN SIGNAL
1 current +
2 measure
3 measure
4 current -
1
43
2

BVT3000 Version 003 BRUKER 15 (67)
Front panel connectors
Thermocouple connector 1.7.3
Figure 1.7. Thermocouple connector (Front view)
Table 1.4. Thermocouple T pin assignment
Other thermocouple connectors have the same pin assignement.
PIN SIGNAL
1 (Cu) Shield
2 (Cu) Thermocouple +
3 (Co.) Thermocouple -
TCP
CONST -
1
2
3
+

16 (67) BRUKER BVT3000 Version 003
Description
RS232 connector 1.7.4
Figure 1.8. RS232 male connector (Front view)
Table 1.5. RS232 connector pin assignment
PIN SIGNAL
1nc
2RxD
3TxD
4nc
5gnd
6nc
7RTS
8DTR
9nc
12345
7986

BVT3000 Version 003 BRUKER 17 (67)
Front panel connectors
N2 connector (option) 1.7.5
Figure 1.9. N2 connector (Front view)
Table 1.6. Evaporator connector pin assignment
BCU05 connector 1.7.6
Figure 1.10. BCU05 connector
Table 1.7. BCU05 connector pin assignment
PIN NUMBER SIGNAL NAME COMMENT
1 heater + power output (0 - 40 vac)
2 level sensor + level detection input (0 - 2,5 v)
3 evaporator detection evaporator detected if grounded
4 gnd ground (0 v)
5 heater - ground power
6 exchanger detection exchanger detected if grounded
PIN NUMBER SIGNAL NAME COMMENT
1heater on turns on the BCU05
when high (>2,4v)
2 dgnd digital ground
3 nc not connected
4
3
2
1
6
5
3
2
1

18 (67) BRUKER BVT3000 Version 003
Description
BVTB 3500 connector 1.7.7
Figure 1.11.
BVTB 3500 connector (Front view)
Table 1.8. BVTB 3500 connector pin assignment
The BVTB3500 is a power booster for the BVT3000.
PIN SIGNAL NAME DIRECTION COMMENT
A +5V O digital vcc output
C NC --- reserved
E gnd_BTO O BTO2000 has an isolated supply GND
G +15 v_BTO O BTO2000 has an isolated supply +15V
J NC --- reserved
L dgnd O digital ground
M sda I/O I2C bus data line
N scl I/O I2C bus clock line
O power control O 0 to 10 volt power control output
P pgnd O power ground
R pgnd O power ground
S thermocouple I safety thermocouple input
T b_relay O BVTB 3500 heater relay command
U b_connected I if grounded BVTB 3500 is detected
J
E
C
E
O
N
MU
L
GPR
S
T

BVT3000 Version 003 BRUKER 19 (67)
2
Options 2
Auxiliary sensors module - BASM 2.1
The BVT3000 can be equipped with an electronic module for auxiliary tempera-
ture measurement.
This module can receive up to 4 sensors to acquire more temperature in spec-
trometer environment (ambient temperature, extra temperature in special probe
head for exemple).
Figure 2.1. BASM front view
The module is inserted in the front of the BVT3300 unit and has a flat cable which
must be connected to the interface board.
CH0 CH1 CH2 CH3
module with 4 Pt100 inputs
module with 4 thermocouple inputs
CH0 CH1 CH2 CH3

20 (67) BRUKER BVT3000 Version 003
Options
Manual Command Module - BMCM 2.2
BMCM is an electronic module which allows to control manually the main func-
tions of the temperature unit.
Figure 2.2. BMCM Front view
The following functions of the temperature unit can be controlled :
•Probe Heater : the left push button of the module turns on the main probe
heater. The heater status is indicated by a green led in the button.
•LN2 Heater : the right push button turns on the LN2 evaporator heater. The
LN2 evaporator heater status is indicated by a green led in the button. The sta-
tus of the LN2 level sensors are indicated by two red leds on the bottom. The
LN2 heater power can be set with rightmost potentiometer.
•Gas flow control : a knob permits to select manually stepwise a gas flow
beetween 0 and 2000 l/h.
The module is inserted in the front of the BVT3300 unit and has 4 flat cables
which must be connected to the interface board.
Low temperature options 2.3
For sample temperature regulation below room temperature one must use cold
gas. The BVT3000 can be equipped with three optional cold gas production devic-
es:
•Liquid nitrogen exchanger.
•Liquid nitrogen evaporator.
•BCU05 gas cooler.
The level of the liquid nitrogen tank is monitored by software and the power level
applied to the liquid nitrogen heater is computer controlled. For the first two op-
tions, an additional printed circuit must be mounted in the enclosure. The liquid ni-
trogen heater cable or the exchanger cable is plugged in the N2 option connector
on the front panel.
LN2 HEATER
ON/OFF ON/OFF
HEATER
REFILL
LN2 LEVEL
EMPTY
115
8
POWER
FLOW LN2