UNITED PRODUCTS & INSTRUMENTS INC. UNICO 1100, UNICO 1100rs Service Manual

UNICO 1100 SERIES

SPECTROPHOTOMETER

Model 1100 Spectrophotometer

Model 1100RS Spectrophotometer

SERVICE MANUAL

UNITED PRODUCTS & INSTRUMENTS INC.

•

MANUFACTURER OF QUALITY OPTICAL SYSTEMS

CONTENTS

1. GENERAL 3

1.1 Introduction 3

1.2 Optical System 4

1.3 Electronic 5

1.4 Specifications 6

1.5 Nomenclature 6-7

2. INSTALLATION 7

3. MAINTENANCE 8

3.1 Working Environment 8

3.2 Replacing Lamps And Adjustments 8

3.3 Wavelength Calibration 8-9

4. SERVICE 9

4.1 Operating Procedure Check 9-10

4.2 Physical 10

4.3 Troubleshooting 11-19

5. DRAWING AND DIAGRAM 20

5.1 PCB Arrangement of Synthetic Electronic System for UNICO 1100 21

5.1.1 Circuit Diagram of Synthetic Electronic System for UNICO 1100 22

5.2 PCB Arrangement of ±15v, +9v Power Supply

23

5.2.1 Circuit Diagram of ±15v, +9v Power Supply

24

5.3 PCB Arrangement of W Lamp Power Supply 25

5.3.1 Circuit Diagram of W Lamp Power Supply 26

5.4 PCB Arrangement of Logarithm Adjustment 27

5.4.1 Circuit Diagram of Logarithm Adjustment 28

5.5 PCB Arrangement of 0%T Adjustment 29

5.5.1 Circuit Diagram of 0%T Adjustment 30

5.6 PCB Arrangement of Amplifier 31

5.6.1 Circuit Diagram of Amplifier 32

6. SCHEMATIC LOYOUT

33

6.1 Schematic Diagram of UNICO 34

7. ELECTRONIC PARTS FOR UNICO 1100 35

7.1 Electronic Parts list for UNICO 1100 35

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1. GENERAL

1.1 INTRODUCTION

The UNICO model 1100 Series spectrophotometers are single beam
general purpose instruments designed for use in conventional laboratories.
The instruments are ideal for various applications such as: Clinical
Chemistries, Biochemistry, Food and Beverage Laboratories, Environmental
Protection, Water and Waste Water Labs and other fields of quality control.

The UNICO 1100 Series spectrophotometers cover the visible
wavelength range from 335nm to 1000nm. The analytical grating system has
1200 lines/mm for higher dispersion of the spectrum.

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Figure 1-1.1

UNICO Model 1100 Spectrophotometer

Figure 1-1.2

UNICO Model 1100RS Spectrophotometer

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1.2 OPTICAL SYSTEM

As shown in Figure 1-2 the white light coming from the Halogen Lamp is
focused by the collecting lens, pass through the Entrance slit of the
Monochromator, through a collimating lens to the Analytical grating where it is
dispersed into its spectrum, then through the Exit slit of the monochromator,
continues through the Sample compartment and finally to the Photo detector.

Figure 1-2

OPTICAL SYSTEM SCHEMATIC DIAGRAM

1. Halogen Lamp 2. Collecting Lens

3. Entrance Slit 4. Collimating Lens

5. Grating 6. Exit Slit

7. Sample 8. Collimating Lens

9. Photodiode

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1.3 ELECTRONIC SYSTEM

The photo detector receives the monochromatic light and generates
photocurrent. A direct current signal which is proportional to the amount of
light energy to the photo detector. The signal is then amplified and processed.
The processed signal is sent to the digital display and also to the external
outputs 0 Volt to 1 Volt analog output and an RS-232C output. Figure 1-3-1
and Figure 1-3-2 demonstrates the electronic systems of Model 1100 and
Model 1100RS respectively

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1.4 SPECIFICATIONS

Table 1-1

MODEL 1100 1100RS

Wavelength Range 335-1000nm 335-1000nm

Spectral Slit Width 20nm 10nm

Wavelength Accuracy

±2nm

±2nm

Wavelength Readability 2nm

Stray Radiant Energy

≤0.5%T@340nm &400nm

≤0.5%T@340nm & 400nm

Transmittance 0%T to 125%T 0%T to 125.0%T

Absorbancy 0A to 2A 0A to 2A

Photometric Accuracy

±2.0%T ±1.0%T

Photometric Noise Level

±2.0%T

±1%T

Power Requirement 115-volt, 60Hz, or 230-volt, 50Hz

Size

408mm(W)×308mm(D)×180mm(H)

Weight 5.5kg

Specifications subject to change without notice

1.5 NOMENCLATURE

Figure 1- 4

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Figure 1- 5

UNICO 1100 SPECTROPHOTOMETER AND NOMENCLATURE

2. INSTALLATION

2.1 The instrument should be installed in a clean environment which is free of

corrosive materials, dust and severe vibrations. Furthermore, it should be
kept away from any strong electric magnetic fields and high frequency fields.

2.2 LINE VOLTAGE

The power can be selected by means of the built-in switchable power
switch to match the line voltage in your country.

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3. MAINTENANCE

3.1 WORKING ENVIRONMENT

The optimum environment for the instruments is as follows

TEMPERATURE 5-35° C
HUMIDITY 85%

Install the instrument in a clean non-vibrational area. Avoid direct strong
light and air flow. The instrument will give better performance if the power
supply stability is at 1% and line frequency less than 1Hz. Always allow the
instrument to warm up for 20 minutes prior to taking any readings.

3.2 REPLACING LAMPS AND ADJUSTMENTS

1. Turn off and unplug the instrument.

2. Turn the instrument upside down.

3. Remove the grill plate on bottom of the instrument by removing fixing
Screw.

4. Unplug the lamp from the white connector.

5. Insert the new lamp, pushing it in as far as it will go. The lamp filament
should face the center of the collecting lens.

CAUTION: DO NOT HANDLE HALOGEN LAMP WITH BARK FINGERS. USE TISSUE OR CLOTH

WHEN HANDLING LAMP.

8. Reinstall the grill plate.

Figure 3-1

Replacing the lamp

3. 3 Wavel e n g t h Calib r a t i o n :

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