Lt200 drb200 tecnico

Dr. Bruno Lange GmbH & Co. KG

Service Manual

LT 200 / DRB 200

DOC222.52.00609.Mar05

Thermostat LT 200 / DRB 200 Software Version 1.3.3

Bei einigen Thermostaten gab es Ausfälle mit dem Fehler „Init Error“ und defekten Heizfolien. Deswegen wurde die Software mit folgenden Änderungen verbessert: Verbesserung der Spannungserkennung in der Initialisierungsphase Menü für Dauertest eingefügt (im erweiterten Testprogramm – Burn in Test) – nur für die Produktion Einführung eines Auslieferungsstatus Sprachauswahl erscheint beim erstmaligen Einschalten (im

erweiterten Testprogramm - Supply Defaults Set) – nur für die Produktion Das Softwareupdate sollte nur auf Geräten erfolgen, welche sich zur Reparatur in der Serviceabteilung befinden. Es sollen keine funktionsfähigen Thermostate mit der neuen Software aktualisiert werden! Achtung: Das Softwareupdate erfolgt nur im Servicecenter in Düsseldorf! Alle anderen Serviceabteilungen tauschen bitte die Rechnerkarte aus! Seit Ende 2004 gibt es 3 zusätzliche Varianten des LT 200 bzw. DRB 200: LTG082.xx.23000 LT 200 9x13 / 6x13mm + 9x13 / 6x13mm LTG082.xx.51000 LT 200 6x13 / 4x20mm + 6x13 / 4x20mm LTG082.xx.44001 DRB 200 9x16 / 6x16mm + 9x16 / 6x16mm As some customers had problems with the reactor LT 200 / DRB 200 (error message “Init Error”, defective heating foils), we modified the software with following improvements: Better recognition of main voltage during the initialization Insert a long time heating test (advanced test program – Burn in Test) – only for production

HACH LANGE GmbH Postfach 27 02 47 D-40525 Düsseldorf

Service Information

Bitte aktualisieren Sie Ihre Serviceunterlagen! Please update your service manuals!

10.03.2005

Volker Maue

VM

+49 (0) 211 5288-375

+49 (0) 211 5288-289

[email protected]

Service Düsseldorf: Bongert, Willms, Krouß, Heger ServiceSupport CC: Möller-Kemsa

Insert a start-up mode after the first power on a language selection appears (advanced test program – Supply Defaults Set) – only for production

Please update only the devices which are being repaired in the service department! Please don’t update devices which are still in working order! Note: The upgrade of the new software version only take place at our service department in Düsseldorf! All other service departments should replace the digital board! Since the end of 2004 some additional version of LT 200 / DRB 200 are available: LTG082.xx.23000 LT 200 9x13 / 6x13mm + 9x13 / 6x13mm LTG082.xx.51000 LT 200 6x13 / 4x20mm + 6x13 / 4x20mm LTG082.xx.44001 DRB 200 9x16 / 6x16mm + 9x16 / 6x16mm Volker Maue BU Lab Photometer

Softwareupdate LT 200 / DRB 200 1. Hilfsmittel PC mit Betriebssystem Windows 9x / Me / NT / 2000 / XP und serieller Schnittstelle Programm Flip (Atmel) Konfigurationsdatei "LT200.cfg" Datei "YYX471.hex"

Achtung: Die komplette Software ist im Intranet im Menü Service / Software verfügbar! Service-Adapter VAA564 Schnittstellenkabel, Nullmodemkabel gekreuzt, Dr.Lange Bestell-Nr. LZV087

2. Vorbereitende Tätigkeiten Programm Flip aus zip-Datei auspacken und auf in einem Ordner abspeichern

3. Update LT 200 / DRB 200 öffnen Auf der Rechnerplatte ZBA719 den gewinkelten 8-poligen Stecker des Serviceadapters VAA564 wie im

Bild dargestellt aufstecken

Das Nullmodemkabel zwischen den Service-Adapter und der seriellen Schnittstelle COM1 des PC's

anschließen (siehe Grafik)

Den gelben Taste am Service-Adapter drücken und den Thermostaten einschalten Im Display des Thermostaten erfolgt keine Anzeige Taster wieder loslassen und am PC das Programm flip.exe starten Im Menü File den Punkt Read Configuration File auswählen (siehe Bild)

Datei "LT200.cfg" auswählen (siehe Bild)

Kabel LZV087

Service- Adapter VAA564

PC

RS232 COM1

ZBA719

LT200 / DRB 200

den Button Run anklicken (siehe roter Kreis im Bild)

die Schritte Erase, Blank Check, Program und Verify werden automatisch nacheinander abgearbeitet

(siehe Bild)

Programm Flip beenden Thermostat ausschalten Service-Adapter entfernen Thermostat einschalten Softwareversion kontrollieren, wird während der Initialisierungsphase angezeigt

Software update LT 200 / DRB 200 1. Aids PC or notebook with Windows 9x / Me / NT / 2000 / XP and serial port

Program Flip (Atmel) Configuration file "LT200.cfg" File "YYX471.hex"

Note: These files are available as download in our Hach-Lange Intranet, menu Service/Software. Service adapter VAA564 Null modem cable, Dr.Lange order no. LZV087

2. Preliminaries Unzip program Flip and save all files in a separate folder

3. Update Open the thermostat LT 200 / DRB 200. Connect the service adapter VAA564 to the digital board ZBA719 (see photo).

Connect the null modem cable LZV087 between service adapter and PC serial port COM1 (see graphic).

Cable LZV087

Service- Adapter VAA564

PC

RS232 COM1

ZBA719

LT200 / DRB 200

Press the yellow switch of the service adapter and power on the thermostat.

Note: It does not appear any text on the display! Release switch and start the program flip.exe. In the menu, select File, Read Configuration File...F4 (see screenshot).

Select file "LT200.cfg" (see screenshot).

Start by clicking Run (see red circle on the screenshot).

The steps Erase, Blank Check, Program and Verify are carried out automatically in sequence (see

screenshot).

Exit program Flip. Power off the thermostat. Remove service adapter. Power on the thermostat. Check the software version, it appears during the initialization.

Dr. Bruno Lange GmbH & Co. KG 1. General • 1

Content

1. General 2 1.1 Variants ............................................................................................................ 2 1.2 Technical data .................................................................................................. 4 1.3 Initializing for 115V / 230V mains voltage ........................................................ 5 1.4 Error messages ................................................................................................ 5

2. Settings 6 2.1 Language.......................................................................................................... 6 2.2 Contrast ............................................................................................................ 6

3. Test program 7 3.1 Loading the test program ................................................................................. 7 3.2 User interface ................................................................................................... 9 3.3 Set block type................................................................................................... 9 3.4 Displaying the software version and block type ............................................. 10 3.5 Restore factory settings.................................................................................. 10

4. Temperature adjustment 11

5. Troubleshooting 15

6. Removing, fitting and repairing individual components 16 6.1 Overview......................................................................................................... 17 6.2 Opening the thermostat.................................................................................. 19 6.3 Top section of the enclosure .......................................................................... 20 6.4 Protective lid ................................................................................................... 20 6.5 Covers ............................................................................................................ 21 6.6 Digital board ................................................................................................... 21 6.7 Display............................................................................................................ 22 6.8 Touch-sensitive keypad.................................................................................. 23 6.9 Mains connector with switch, interference suppression filter ......................... 23 6.10 Powerpack board ......................................................................................... 24 6.11 Heating block, heating foil, temperature sensor........................................... 26

7. Spare parts 28

8. Inspection document 34

9. Circuit diagrams and component mounting diagrams 37

2 • 1. General Dr. Bruno Lange GmbH & Co. KG

1. General

1.1 Variants LT 200 Article no. LTG082.xx.10000 Openings: 9 x 13mm and 2 x 20mm

Article no. LTG082.xx.21000 Openings: 15 x 13mm

Openings: 6 x 13 and 4 x 20mm


DRB 200 Article no. LTG082.xx.30001 LTG082.xx.40001: Openings: 9 x 16mm and 2 x 20mm Openings: 15 x 16mm

Article no. LTG082.xx.42001 Openings: 15 x 16mm

Openings: 6 x 16 and 4 x 20mm

4 • 1. General Dr. Bruno Lange GmbH & Co. KG

1.2 Technical data Type Thermostat with one heating block or two separate heating blocks with integrated

protective lids for heating cuvette tests and reaction vessels Temperature programs LT 200:

COD program (148°C, 120 min) 100°C program (100°C, 30, 60, 120 min) 40°C program (40°C, 10 min) and freely selectable from 37 to 148°C (no cooling) DRB 200: TOC program (105°C, 120 min) 100°C program (100°C, 30, 60, 120 min) 105°C program (105°C, 30, 60, 120 min) 150°C program (150°C, 30, 60, 120 min) 165°C program (165°C, 30, 60, 120 min) and freely selectable from 37 to 165°C (no cooling)

Time programs Freely selectable 0-480 min; acoustic signal after countdown to zero Heating rate LT 200:

from 20°C to 148°C in 10 min (in conformity with DIN 38409-44) DRB 200: from 20°C to 150°C in 10 min

Temperature stability +/- 2°C Number of cuvettes LT 200:

LTG082.xx.10000: 9 x 13 mm diameter, 2 x 20 mm diameter LTG082.xx.21000: left: 15 x 13 mm diameter right: 6 x 13 mm diameter, 4 x 20 mm diameter DRB 200: LTG082.xx.30001: 9 x 16 mm diameter, 2 x 20 mm diameter LTG082.xx.40001: 15 x 16 mm LTG082.xx.42001: left: 15 x 16 mm diameter right: 6 x 16 mm diameter, 4 x 20 mm diameter

Power requirements 115 / 230 V, +5%/-15%, 50 / 60 Hz, safety class I Power input LTG 082.xx.10000, LTG082.xx.30001 / LTG082.xx.40001:

115 V: 300 VA; 230 V: 450 VA LTG 082.xx.21000, LTG082.xx.42001: 115 V: 600 VA; 230 V: 900 VA

Safety tests CE, GS and cTUVus Environmental requirements

Operating temperature: 10 - 45°C Storage temperature: -40 - 60°C Relative humidity: max. 90%, non-condensing

Dimensions W x H x D: 250 x 145 x 310 mm Weight LTG 082.xx.10000, LTG082.xx.30001 / LTG082.xx.40001: 2 kg (instrument only),

3.5 kg (with packaging) LTG 082.xx.21000, LTG082.xx.42001: 2.8 kg (instrument only), 4.3 kg (with packaging)

Warranty 2 years


1.3 Initializing for 115V / 230V mains voltage The thermostat is suitable for both 115V and 230V mains voltage. The software determines the correct voltage setting automatically during the initialization phase. When the thermostat is switched on, the heating block or, in the case of a two-block thermostat, the right heating block is heated for 5 seconds at full power (both half-waves of the power supply are used). If the temperature change after 5 seconds is less than 3°C, the software assumes that the mains voltage is 115V. The heating foil is driven by the full wave of the 115V power supply. If the temperature change after 5 seconds is greater than 3°C, the software assumes that the mains voltage is 230V. In this case, the heating foil is driven by only every fourth wave of the 230 V power supply. The heating foil can therefore be used with approximately the same power input at different mains voltages. The right and left heating blocks of a two-block thermostat are driven alternately. This reduces the load on the power supply network.

1.4 Error messages Error message Explanation Response Block too hot! Please Wait!

After the thermostat is switched on, it is heated for about 5 seconds to initialize it. However, if the block temperature is greater than 160°C before the heating phase starts, this error message is displayed.

A user program has been started but the block temperature is higher than the required temperature.

Allow the block to cool Check temperature sensor Check powerpack board

Init error Initialization could not be performed. The thermostat is not heating up.

Check temperature sensor Check heating foil Check powerpack board

No amplifier adjust! Digital board has not been adjusted

Replace digital board

No interface! No user interface has been selected

Select user interface in advanced test program.

No block select! No block type has been selected

Select block type in advanced test program.

No block adjust! No temp. adjustment has been carried out

These error messages are for use during production.

Select adjust temp. in test program.

No tuning left! The temperature adjustment was started but not completed.

Initializing Overtemp. WAIT!

Initialization could not be carried out. Check temperature sensors Pt1 and Pt2

Check heating foil Check powerpack board

6 • 2. Settings Dr. Bruno Lange GmbH & Co. KG

2. Settings

2.1 Language Press the left key, keep it held down and switch on.

The following language options are available: GB Great Britain D Germany F France I Italy E Spain NL Netherlands S Sweden PL Poland After a language has been selected, the initialization of the thermostat starts.

2.2 Contrast Press the centre key, keep it held down and switch on.

The contrast can be adjusted with the left and centre keys. Press the right key to store the setting. The initialization of the thermostat then starts.

Sprache GB D

Contrast 140

OK

Dr. Bruno Lange GmbH & Co. KG 3. Test program • 7

3. Test program

3.1 Loading the test program There are a basic and an advanced test program. The basic test program can only be used to adjust (calibrate) the temperature of the heating blocks. The advanced test program can be used to specify the number of blocks and set the software to Dr. Bruno Lange or Hach mode.

Basic test program Press the right key, keep it held down and switch on.

Service

Temp. adjust Start

Service End

Main program

Temperature adjustment

Final inspection Start End

Only for Production!

8 • 3. Test program Dr. Bruno Lange GmbH & Co. KG

Advanced test program Press the right key, keep it held down and switch on. Then press the left key and keep it held down for about 10 seconds.

Set block type left right

Service

Ampl. adjust Start Beep

Only for Production! Emits audible signal

User interface ∗DBL Hach

Block right 15 9+2

Block left 15 9+2

Block right 6+4 End

Block left 6+4 End

Info Show

Info about block selection and software

Temp. adjust Start

Service End

Temp. adjustment Main program

Only for Production!

Final inspection Start End

Final inspection Start

Dr. Bruno Lange GmbH & Co. KG 3. Test program • 9

3.2 User interface In the User Interface menu of the advanced test program, the left key can be used to select DBL (Dr. Bruno Lange) and the centre key can be used to select Hach. If DBL is selected, the time starts to count down to zero immediately after the program starts. If Hach is selected, the time starts to count down to zero when the selected temperature has been reached and the Start key has been pressed. Press the right key ( ) until the following menu appears.

Press the left key (End). The program branches back to normal mode. Note: When DBL or Hach is selected, the temperature programs in the user menu revert to the

factory settings.

3.3 Set block type In the Set block type menu in the advanced test program, the left key can be used to select the left block type and the right key to select the right block type. The following block types can be selected: Block type LT 200 DRB 200

15 15 x 13mm 15 x 16mm 9+2 9 x 13mm + 2 x 20mm 9 x 16mm + 2 x 20mm 6+4 6 x 13mm + 4 x 20mm 6 x 16mm + 4 x 20mm

The selections can be saved by pressing the End key.

User interface ∗DBL Hach

Service End

Set block type left right

Block left 6+4 End

10 • 3. Test program Dr. Bruno Lange GmbH & Co. KG

3.4 Displaying the software version and block type In the Info menu of the advanced test program, the Show key on the left can be used to display the software version and the selected block type. For example: DBL = Dr. Bruno Lange user interface 15 = Left block type 15 x 13mm 6+4 = Right block type 6 x 13mm + 4 x 20mm V1.2.2 = Software version 1.2.1 Software history: Version 1.2.2 First delivery Sep. 2003 Version 1.2.3 Default contrast changed, Error message "No interface" implemented (for production)

Oct. 2003

3.5 Restore factory settings In order to restore the factory settings, DBL or Hach must be selected again in the User Interface menu. See 3.2 User interface

Info Show

DBL 15 6+4 V 1.2.2

Dr. Bruno Lange GmbH & Co. KG 4. Temperature adjustment • 11

4. Temperature adjustment General The temperature adjustment is described for the double block (LTG082.xx.21000, LTG082.xx.42001). Aids Glycerol, anhydrous (reagent grade >99.5%), approx. 5ml Laboratory thermometer ASTM 67C (range 95°C – 155°C, resolution 0.2°C, height 379mm)

Article-No.: VAA568 Pipette Protective goggles

LT 200: Cuvette, outside diameter 13mm, Order no.: LCW906 (25 cuvettes) DRB 200: Cuvette, outside diameter 16mm, Order no.: 2275800 (1 cuvette), 2275806 (6 cuvettes) Preparation of the cuvette LT 200: Mark the cuvette 62mm (+/-0.5 mm) from the base. DRB 200: Mark the cuvette 56mm (+/-0.5mm) from the base. Place the laboratory thermometer in the cuvette. Use a pipette to fill the cuvette up to the mark with glycerol.

Note: The glycerol should be at room temperature! Position of the cuvette Second row from the front, in the middle (see in the diagram) LT 200: Article no. LTG082.xx.10000 Article no. LTG082.xx.21000

12 • 4. Temperature adjustment Dr. Bruno Lange GmbH & Co. KG

Take care: Wear protective goggles! Hot glycerol could escape from the open cuvette.

DRB 200: Article no. LTG082.xx.30001 Article no. LTG082.xx.40001

Article no. LTG082.xx.42001

Adjustment Place the cuvette in the left block.

Start the basic test program (see 3.1 Loading the test program): Press the right key, keep it held down and switch on.

In the Temp. adjust menu, press the left key (Start) The thermostat heats both blocks to 100°C.

Temp. adjust Start

23°C 25°C 120' 120'

Dr. Bruno Lange GmbH & Co. KG 4. Temperature adjustment • 13

When the block temperature reaches 100°C the thermostat emits an acoustic signal.

Note: The temperature in the heating block and the cuvette is stable after about 25 minutes. Please wait until the displayed time is below 95'! Press the left key.

Use the left and centre keys (under the arrows) to set the value displayed by the laboratory thermometer and press the right key (OK).

Place the laboratory thermometer in the right block together with the cuvette and wait until the value displayed by the laboratory thermometer is stable. Press the right key.

Use the left and centre keys (under the arrows) to set the value displayed by the laboratory thermometer and press the right key (OK).

The corrected temperature is accepted after it has been confirmed by pressing the OK key. After the correction has been carried out, check the desired temperature of 100°C again with the laboratory thermometer. Take care: The 100°C correction can only be carried out once per adjustment sequence.

True value left 100.0 OK

100°C 100°C 90' 90'

100°C 100°C 110' 110'

100°C 100°C 90' 90'

True value right 100.0 OK

14 • 4. Temperature adjustment Dr. Bruno Lange GmbH & Co. KG

Press the centre key.

Press the right key (End).

If another temperature adjustment is necessary, press the left key (Start) in the next menu. If no further correction is needed, press the right key ( ).

Press the left key (End).

The program branches back to normal mode. The thermostat carries out the initialization. Checking the temperature Insert the laboratory thermometer in the thermostat together with the cuvette and heat to 100°C in normal mode. After about 25 minutes read the temperature shown by the thermometer. The tolerance of +/- 2°C should not be exceeded. Cooling phase At a room temperature of about 24°C the cooling time: from 148°C 40°C = 160 minutes from 100°C 40°C = 125 minutes

Final inspection Start _ End

100°C 100°C80' 80'

Temp. adjust Start

Service End

Dr. Bruno Lange GmbH & Co. KG 5. Troubleshooting • 15

5. Troubleshooting The following table should serve as a troubleshooting aid. The identification of faults in individual components is described in detail in section "6. Removing, fitting and repairing individual component".

Problem Fault identification Display remains blank after the thermostat is switched on.

Measure mains voltage Press or replace the switch Measure powerpack board voltage fuse F1 okay? Check cable from powerpack board to digital board Measure +5V on digital board Replace the display Replace the digital board

Thermostat does not heat up. Measure powerpack board voltage fuses F2, F3 okay? Check heating foil Check temperature sensor Check cable from powerpack board to digital board Replace the powerpack board Replace the digital board

Thermostat heats up too far or not far enough.

Carry out temperature adjustment Check heating foil Check temperature sensor Check cable from powerpack board to digital board Replace the powerpack board Replace the digital board

Only the left heating block of a two-block thermostat is displayed.

Check right temperature sensor Check right heating foil Check cable from powerpack board to digital board Replace the powerpack board Replace the digital board

The thermostat cannot be operated.

Cable between touch-sensitive keypad and computer - no contact Defective touch-sensitive keypad Replace top section of enclosure, including touch-sensitive keypad Replace the digital board

16 • 6. Removing, fitting and repairing individual components Dr. Bruno Lange GmbH & Co. KG

6. Removing, fitting and repairing individual components

Dr. Bruno Lange GmbH & Co. KG 6. Removing, fitting and repairing individual components • 17

6.1 Overview

Outside view

1 – Protective lid, transparent 2 – Cover, black 3 – Insulating mat 4 – Top section of enclosure 5 – Touch-sensitive keypad 6 – Display 7 – Digital board


Inside view

1 – Protective padding 2 – Heating block 3 – Interference suppression filter 4 – Spacer 5 – Powerpack board 6 – Mains connector and switch 7 – Bottom section of enclosure 8 – Base of enclosure


6.2 Opening the thermostat Unplug the thermostat. Remove the seal from the base or push a Phillips screwdriver through it, and remove the 4 screws (see

1 in illustration)

Use a screwdriver to carefully bend inward the two locking hooks (see 2 in the illustration) on the base

and remove the top section of the enclosure.


6.3 Top section of the enclosure Remove the top section of the enclosure: Open the thermostat (see 6.2 Opening the thermostat) Disconnect the connector from the powerpack board (see 1 in the illustration)

Spare part: LT 200: LZT038 Top section of enclosure (Lange) with touch-sensitive keypad DRB 200: LZT039 Top section of enclosure (Hach) with touch-sensitive keypad

6.4 Protective lid Remove the protective lids: Half open the protective lid (about 45°) and take hold above the external hinge, with your thumb inside

the protective lid. Press your thumb against the inside of the protective lid and carefully bend it slightly open and lift it

forward out of its mount (see illustration).

Then raise the protective lid slightly and remove the other side from the mount.

Spare part: LZT048 Protective lid, transparent


6.5 Covers Open the thermostat (see 6.2 Opening the thermostat). Remove the top section of the enclosure (see 6.3 Top section of the enclosure). Remove the protective lids (see 6.4 Protective lid). Remove the screws (1 and 2 in the illustration) and take out the covers.

Note: The insulating mats are not included in the spare part. Spare part: LT 200+DRB 200: LZT047 Cover without openings

LT 200: LZT041 Cover 9x13 2x20

LZT042 Cover 15x13 LZT043 Cover 6x13 4x20

DRB 200: LZT044 Cover 9x16 2x20

LZT045 Cover 15x16 LZT046 Cover 6x16 4x20

6.6 Digital board Fault identification: Measure the +5V DC on the digital board at connector P3, PIN2 = +5V, PIN3=GND (see illustration).


Replacing the board: Open the thermostat (see 6.2 Opening the thermostat). Remove the top section of the enclosure (see 6.3 Top section of the enclosure). Disconnect the ribbon cable from the two cable holders in the top section of the enclosure.

Take care: The connector of the ribbon cable (see 1 in the illustration) is soldered to the digital board

and cannot be disconnected there! Disconnect the cable of the touch-sensitive keypad (see 2 in the illustration) from the digital board. Remove the 4 screws (see 3 in the illustration).

Take care: The threaded sleeves under the screws may turn with the screws. Hold the threaded

sleeves in place with a 5.5 mm open-ended spanner!

Remove the digital board.

After replacement: Power on the device On the display of the thermostat appears " No interface!" Press the key below "OK", the advanced test program appears in menu User Interface select Hach or DBL, see 3.2 User interface in menu Set block type select block type, see 3.3 Set block type in menu Temp. adjust press Start, see 4. Temperature adjustment

Spare part: YAB001 Digital board

6.7 Display Fault identification: Measure the +5V DC on the digital board (see 6.6 Digital board). Set the contrast, see (2.2 Contrast).

Replacing the display: Remove the digital board. Remove the 4 threaded sleeves (see 1 in the illustration) with a 5.5mm socket spanner or open-ended

spanner. Remove the display.

Note: After mounting a new display, do not tighten the threaded sleeves too firmly, as this could

cause them to be ripped out of the plastic.


Spare part: YAB017 Display

6.8 Touch-sensitive keypad Fault identification: Check the keypad cable to ensure that there is a good connection with the digital board (see 6.6 Digital

board). Replacing the keypad: If the touch-sensitive keypad is defective, replace the complete top section of the enclosure together

with the keypad (see 6.3 Top section of the enclosure). Spare part: LT 200: LZT038 Top section of enclosure (Lange) with touch-sensitive keypad DRB 200: LZT039 Top section of enclosure (Hach) with touch-sensitive keypad

6.9 Mains connector with switch, interference suppression filter Fault identification: See 6.10 Powerpack board Replacing the mains connector with switch: Open the thermostat (see 6.2 Opening the thermostat). Remove the top section of the enclosure (see 6.3 Top section of the enclosure). Remove the nut (see 2 in the illustration) from the interference suppression filter (see 1 in the

illustration) with a 7mm open-ended spanner.

Push the interference suppression filter to one side and disconnect the cables connected to the mains

connector. Press in the top and bottom locking hooks on the mains connector (see 1 in the illustration below) and

pull out the unit. Note: Press in the bottom locking hook with an offset screwdriver or similar.


Spare part: LZT040 Mains connector with switch

6.10 Powerpack board Method of functioning: Section of the circuitry (double block)

Part 1: The mains current is supplied to connector P4 of the powerpack board via the mains connector and the interference suppression filter. The current passes through the fuse F1 (6.3A T) to the triacs V1 and V2. The triacs are driven from the digital board via the optocouplers H1 and H2. The current from the triacs is conducted through connectors P2 and P3 to the heating foils. Each heating foil is protected by a 3.15 A T fuse (F2 and F3). Part 2: The mains current passes through the varistor R11 and the fusing resistor R5 to the bridge rectifier D1. The pulsating direct current is smoothed by the capacitor C2 and applied to the internal switched mode power supply (I4, L3 ...). The required +5V voltage is set with the help of the voltage drop over D4 and I1. The current is smoothed with C3 and L2 and applied to the digital board through connector P1. See 9. Circuit diagrams and component mounting diagrams


Fault identification: Warning: When the thermostat is open and switched on, potentially lethal voltages are present

on the powerpack board and the heat sinks of the triacs! Switch on the open thermostat. Measure the following voltages at the measuring points shown in the illustration:

Measuring point Voltage Cause of fault if no voltage is

present Response

1 – 2 115/230 V AC Mains input defective Defective switch Defective interference

suppression filter

Replace mains connector and switch

Check interference suppression filter

1 – 3 115/230 V AC Fuse F1 = 6.3A slow reacting/ defective



Check heating foil Replace powerpack board

6 – 7 + 5 V DC Switched mode mains power supply defective

Replace powerpack board

Replacing the powerpack board: Open the thermostat (see 6.2 Opening the thermostat). Remove the top section of the enclosure (see 6.3 Top section of the enclosure). Unplug the infeed (see 1 in the illustration) and the two heating foil connectors (see 2 in the illustration). Unplug the two temperature sensor connectors (see 3 in the illustration) while pressing the connector

latch.

Lift out the powerpack board. Spare part: YAB002 Double powerpack board YAB016 Single powerpack board


6.11 Heating block, heating foil, temperature sensor Fault identification: Two heating foils are bonded to each heating block. They are connected in series. Between them is a

thermal link (see illustration)

1 – Heating foil 2 – Heating foil 3 – Thermal link 4 – PT1000 temperature sensor 5 –Temperature sensor connection 6 – Heating foil connection 7 – Spacer Disconnect the connector for the heating foil (plug-in place HEAT 1 or HEAT 2 on the powerpack board)

and measure the resistance with a multimeter: approx. 43 Ohm Disconnect the connector for the PT1000 temperature sensor (plug-in place Pt 1 or Pt 2 on the

powerpack board) and measure the resistance with a multimeter: Temperature (°C) Approx. resistance (Ohm) 0 1000 10 1039 20 1078 30 1116 40 1155 50 1194 60 1232 70 1271 80 1309 90 1347 100 1385 110 1423 120 1461 130 1498 140 1536 150 1573

Note: If a thermal link (resistance = infinite) or a heating foil or a temperature sensor is defective,

always replace the complete heating block! Replacing the heating block, etc.: Open the thermostat (see 6.2 Opening the thermostat). Remove the top section of the enclosure (see 6.3 Top section of the enclosure). Disconnect the connector of the powerpack board (see 6.10 Powerpack board).


Remove the interference suppression filter (see 6.9 Mains connector with switch, interference suppression filter) and the grounding cable of the fixing screw.

Remove the 4 screws for the right (see 1 in the illustration) or the left heating block (see 2 in the illustration).

Replace the complete heating block

Spare part: LT 200: LZT032 Lange heating block, 9x13 2x20

LZT033 Lange heating block, 15x13 LZT034 Lange heating block, 6x13 4x20

DRB 200: LZT035 Hach heating block, 9x16 2x20

LZT036 Hach heating block, 15x16 LZT037 Hach heating block, 6x16 4x20

28 • 7. Spare parts Dr. Bruno Lange GmbH & Co. KG

7. Spare parts

LT 200 + DRB 200

Display Order no.: YAB017

Mains connector with switch Order no.: LZT040

Powerpack board, double Order no.: YAB002

Powerpack board, single Order no.: YAB016

Digital board Order no.: YAB001

Protective lid, transparent Order no.: LZT048

Dr. Bruno Lange GmbH & Co. KG 7. Spare parts • 29

Cover without openings Order no.: LZT047


LT 200

Cover 15x13 Order no.: LZT042

Cover 6x13 4x20 Order no.: LZT043


Top part of enclosure (Lange) with touch-sensitive keypad Order no.: LZT038


Heating block (Lange) 9x13 2x20 Order no.: LZT032

Heating block (Lange) 15x13 Order no.: LZT033

Heating block (Lange) 6x13 4x20 Order no.: LZT034


DRB 200 Cover 15x16 Order no.: LZT045



Top part of enclosure (Hach) with touch-sensitive keypad Order no.: LZT039


Heating block (Hach) 15x16 Order no.: LZT036

Heating block (Hach) 6x16 4x20 Order no.: LZT037

Heating block (Hach) 9x16 2x20 Order no.: LZT035

34 • 8. Inspection document Dr. Bruno Lange GmbH & Co. KG

8. Inspection document

Inspection document

Dear Customer The company Dr. Bruno Lange GmbH, Germany, has introduced a quality system according to DIN EN ISO 9001. Dr. Lange-Instruments are designed, produced and serviced according to the requirements of this quality system. If using the service regularly, you can be sure that you fullfill the requirements of your own quality system. This servicing document helps you to document you control and inspection activities of your measuring and the test equipment. Name of Instrument:

Instrument-Type: LTG

Instrument-No.: Results:

Keys ok

Display ok

Power supply ok

Timer ok

Temperature ok

Temperature heating block, left: Nominal value 100 °C 148 °C

Tolerance + / - 2 °C + / - 2 °C

Actual value Temperature heating block, right: Nominal value 100 °C 148 °C

Tolerance + / - 2 °C + / - 2 °C

Actual value

Date: Service engineer: Signature:

Dr. Bruno Lange GmbH & Co. KG 9. Circuit diagrams and component mounting diagrams • 37

9. Circuit diagrams and component mounting diagrams

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