Bruker BVT3300 User manual

BRUKER
Version
Variable Temperature
Unit
Technical Manual
BVT3300
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: Z31349
DWG-Nr: 1058 / 003

BVT3300 Version 003 BRUKER 3 (67)
Contents
Contents ............................................................... 3
Index ..................................................................... 5
1 Description ............................................................. 7
1.1 Introduction ......................................................................... 7
1.2 BVT3300 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 ..................................................12
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 sensor option - BASM .......................................... 19
2.2 Manual Command Module - BMCM .................................... 20
2.3 Low temperature options ................................................... 20
2.4 LN2 exchanger .................................................................. 21
Exchanger presentation .................................................21
2.5 LN2 evaporator .................................................................. 22
Evaporator presentation .................................................22
2.6 BCU05 gas cooler ............................................................. 23
3 Configuration........................................................ 25
3.1 Sensor selection ................................................................ 25
3.2 Eurotherm 847 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 BVT3300 Version 003
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

BVT3300 Version 003 BRUKER 5 (67)
Index
B
BBIS eeprom....................................................................................................... 28
BCU05 connector................................................................................................ 17
BCU05 gas cooler......................................................................................... 20, 23
BTO2000................................................................................................. 10, 14, 25
BVTB 3500 connector......................................................................................... 18
C
CJC selection...................................................................................................... 26
D
digital interface specification............................................................................... 27
E
evaporator........................................................................................................... 17
exchanger ........................................................................................................... 17
F
front panel connectors......................................................................................... 13
fuses.................................................................................................................... 52
G
Gas flow indicator................................................................................................ 10
H
Heater connector................................................................................................. 13
L
LN2 evaporator ................................................................................................... 20
Low temperature................................................................................................. 20
N
N2 connector....................................................................................................... 17

6 (67) BRUKER BVT3300 Version 003
P
Pt100 connector..................................................................................................14
R
remote interface control ...................................................................................... 27
RS232 connector ................................................................................................ 16
S
Sensor selection.................................................................................................. 25
T
Temperature controller..........................................................................................7
Thermocouple connector ....................................................................................15
thermocouple T.....................................................................................................9

BVT3300 Version 003 BRUKER 7 (67)
1
Description 1
Introduction 1.1
0The new variable temperature unit BVT3300 for sample temperature regulation is
equipped with a microcontroller interface for remote control by the host computer.
The BVT3300 is manufactured in a separate housing.
The unit includes:
- A main board called interface board with a microcontroller.
- A temperature controller (EUROTHERM model 847).
- 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 LN2 heater evaporator control or LN2 exchanger.

8 (67) BRUKER BVT3300 Version 003
Description
Figure 1.1. BVT3300 block diagram
BVT3300 main components 1.2
The interface board has a microcontroller for remote control of the BVT3300. Two
RS232 links are available 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 Eurotherm 847 temperature controller.
A main toric transformer supplies the different groups. At rear, there is a power
supply plug. The thyristor bridge, for heater power control, is placed on the hous-
ing at rear side. On the front, a gas flow indicator with a steel ball detects the gas
flow. A device, called valve block, is a group of valves which determines the gas
flow 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

BVT3300 Version 003 BRUKER 9 (67)
Parts location
Parts location 1.3
Figure 1.2. Parts location
0
Principle of operation 1.4
The sample tube placed in the magnet of the spectrometer is heated by a con-
stant gas flow delivered by the BVT3300. A temperature sensor (e.g. a thermo-
couple T) located under the sample tube measures the gas temperature. The
temperature controller compares the probe temperature to the target temperature
programmed by the operator. It controls the power applied to the heater placed at
the base of the magnet in order to stabilise the gas temperature. A special detec-
tor monitors the gas flow and switch off the heater power if there is no gas flow. A
security thermocouple checks also the heater temperature and avoids probe over-
heating.
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 BVT3300 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. BVT3300 front panel
BVT3300
BRUKER
HEATER BCU05
POWER
578
2
EUROTHERM
RM A/M PAR
OP1
OP2
847
T
N2
GAS OUT GAS IN
BTO P.S.
BVTB3500
PT100 SENSOR
10 11 12 139
AUXILIARY SENSORS
DIGITAL
GAS FLOW
6
RS232
3 41

BVT3300 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, let the gas flow through a calibrated
hole. As all valves are in parallel, it is possible to obtain 15 different gas flow rate.
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"onpage45 .
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
GAS
FLOW
SENSOR
GAS FLOW REDUCERPRESSURE REGULATOR
GAS IN
VALVE CONTROL
VALVE
GAS OUT
VALVE BLOCK

12 (67) BRUKER BVT3300 Version 003
Description
Settingupthegasflow 1.6.1
Connect the BVT3300 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 BVT3300. 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 on
NMR spectrometer.
Table 1.1. Flow rate versus command
DECIMAL
COMBINA-
TION
COMBI-
NATION
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

BVT3300 Version 003 BRUKER 13 (67)
Front panel connectors
Front panel connectors 1.7
Heater connector 1.7.1
The heater is plugged in this connector. A safety thermocouple is located close to
the heater resistance in order to detect an overheating in case of a missing gas
flow for example.
Figure 1.5. Heater connector (Front view)
Table 1.2. Heater connector pin assignment
PIN SIGNAL
1 heater +
2 heater +
3 security thermocouple +
4 security thermocouple -
5 heater -
6 heater -
7gnd
43
2
16
57

14 (67) BRUKER BVT3300 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

BVT3300 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
PIN SIGNAL
1 (Cu) Shield
2 (Cu) Thermocouple +
3 (Co) Thermocouple -
TCP
CONST -
1
2
3
+

16 (67) BRUKER BVT3300 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

BVT3300 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 (output) 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 BVT3300 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 BVT3300.
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 output +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

BVT3300 Version 003 BRUKER 19 (67)
2
Options 2
Auxiliary sensor option - BASM 2.1
The BVT3300 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 environement (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 BVT3300 Version 003
Options
Manual Command Module - BMCM 2.2
The BMCM is an electronic module which allows to control manually the main
functions 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 BVT3300 can be equipped with three optional cold gas
production devices :
•LN2 exchanger
•LN2 evaporator
•BCU05 gas cooler
The level of the LN2 tank is monitored by software and the power level applied to
the LN2 heater is computer controlled. For both first options, an additional printed
circuit must be mounted in the enclosure. The LN2 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