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Guildline 5031 Technical Manual

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TECHNICAL MANUAL
FOR
MODEL 5031
AIR BATH
NOTICE
The contents and information contained in this manual are proprietary to
Guildline Instruments. They are to be used only as a guide to the operation
and maintenance of the equipment with which this manual was issued, and
may not be duplicated or transmitted by any means, either in whole or in
part, without the written permission of Guildline Instruments.
TM5031-D1-00
15 May, 2019

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Summary of Contents for Guildline 5031

  • Page 1 NOTICE The contents and information contained in this manual are proprietary to Guildline Instruments. They are to be used only as a guide to the operation and maintenance of the equipment with which this manual was issued, and may not be duplicated or transmitted by any means, either in whole or in part, without the written permission of Guildline Instruments.

  • Page 3: Table Of Contents

    TABLE OF CONTENTS INTRODUCTION ....................1-1 1.1. SCOPE ..............................1-1 1.2. GENERAL DESCRIPTION ........................ 1-2 1.3. FRONT PANEL INDICATORS AND CONTROLS ................. 1-3 1.3.1. Power ..............................1-3 1.3.2. Heater ON and OFF ..........................1-3 1.3.3. High / Low ............................1-3 1.3.4. Cooling ...............................1-3 1.3.5.
  • Page 4 5.4. HEATER DRIVER ..........................5-3 5.5. OVER TEMPERATURE CIRCUIT ....................5-3 5.6. POWER SUPPLY ..........................5-4 TM5031-D1-00TM5031-D1-00 15 May, 2019...
  • Page 5 TABLE OF FIGURES FIGURE 1-1: FRONT VIEW ............................1-1 FIGURE 1-2: CONTROL PANEL ..........................1-3 FIGURE 5-1: HEATER CONTROL UNIT ......................5-1 FIGURE 5-2: TEMPERATURE SENSITIVE OSCILLATOR .................5-2 FIGURE 5-3: AMPLIFIER AND DETECTOR ......................5-2 FIGURE 5-4: HEATER DRIVER ..........................5-3 FIGURE 5-5: OVER TEMPERATURE CIRCUIT ....................5-3 FIGURE 5-6: POWER SUPPLY ..........................5-4 TM5031-D1-00TM5031-D1-00 15 May, 2019...
  • Page 6 LIST OF TABLES TABLE 2-1: GENERAL SPECIFICATIONS ......................2-1 TABLE 3-1: SUGGESTED CONTROL SETTINGS ....................3-3 TABLE 4-1: CONTROL CIRCUIT BOARD TESTING ..................4-2 TABLE 4-2: TRANSISTOR VOLTAGES........................4-3 TM5031-D1-00TM5031-D1-00 15 May, 2019...

  • Page 7: Introduction

    Section 1 INTRODUCTION Figure 1-1: Front View 1.1. SCOPE This manual contains technical specifications, a detailed description, maintenance information, and diagrams for the Guildline Instruments model 5031 Air Bath. 15 MAY, 2019 29 October, 2018...

  • Page 8: General Description

    Section 1 1.2. GENERAL DESCRIPTION The model 5031 Air Bath is a bench top high precision, variable temperature bath which provides 0.08 m (2.9 cu. ft.) of usable temperature controlled chamber. The internal temperature is maintained by a solid state control system. The regulated temperature can be selected from a digital switch control on the front control panel.

  • Page 9: Front Panel Indicators And Controls

    Section 1 Figure 1-2: Control Panel 1.3. FRONT PANEL INDICATORS AND CONTROLS The front panel indicators and controls are illustrated in Figure 1-2. They are provided to indicate power status, heater operation and temperature status. 1.3.1. Power The POWER switch controls AC line power to the air bath. 1.3.2.

  • Page 10: Rear Panel Connectors And Controls

    Section 1 1.4. REAR PANEL CONNECTORS AND CONTROLS The rear panel connectors and controls include power entry, and line voltage selection. 1.4.1. Line Input Connector The Line input connector is a standard male 3-prong AC connector, with an integral fuse. A 2 amp time delay fuse is provided for 115 VAC operation and a 1 amp time delay fuse is provided for 230 VAC operation.

  • Page 11: Specifications

    Section 2 SPECIFICATIONS 2.1. GENERAL SPECIFICATIONS 5031 PECIFICATIONS Chamber Temperature Range 15 °C to 50 °C, (Minimum to 6 °C below ambient) ± 0.06 °C over 1 year within ± 5°C of ambient Temperature Set Point ± 0.1 °C over 1 year outside ± 5°C of ambient Accuracy ±...

  • Page 12: Operating Instructions

    Only fuses with the rated current and specified type should be used for replacement. The 5031 has been shipped with the line input voltage selector set to 230 V. The line input selector must be set to the correct line voltage before power is applied to the instrument.

  • Page 13: Operating Notes

    6 hours before use. 3.2. OPERATING NOTES Operation of the Model 5031 Air Bath comprises of selecting control settings and monitoring the air temperature. The following paragraphs contain suggested procedures for the use of the controls.

  • Page 14: Bath Temperature Selection

    Section 3 RANGE COOLING HIGH/LOW 15 C to 20 C 20 C to ambient+10 C HIGH ambient +10 C to 40 C 40 C to 50 C HIGH Table 3-1: Suggested Control Settings 3.2.2. Bath Temperature Selection The operating temperature is determined by the TEMPERATURE SET control. A table attached to this manual provides the settings required for the full range of the bath.

  • Page 15: Maintenance

    Section 4 MAINTENANCE 4.1. PREVENTIVE MAINTENANCE 4.1.1. Cleaning The instrument requires very little maintenance other than periodic dusting of the outside and inside of the enclosure. Remove accumulated dust from the air filter on the rear door. 4.1.2. Temperature Check Insert a thermometer in through the side access hole and make a direct measurement of the air temperature within the chamber.

  • Page 16: Table 4-1: Control Circuit Board Testing

    Section 4 Control circuit board testing - Measure the voltage at the terminals as indicated in Table 4-1. Between Should Read Components To Check -12 V D.C CR106, CR107 -3.2 V see NOTE 1 -3.2 V see NOTE 1 -3.2 V see NOTE 1 ...

  • Page 17: Over Temperature

    Section 4 If this waveform is observed, then measure the D.C. voltage between TP3 (CR104 anode) and Jl-7. It should read -2.5 volts. If not, then check C105, C107, CR103 and CR104. If it is correct, then check Q104, Q105, R121, R122 and R114. Note: Both of the above indicated waveforms are typical, if RT1 is at ambient temperature of about 25 °C.
  • Page 18 Section 4 If the HEATER lamps do not indicate heater cycling when the temperature approaches normal, then check the operation of the control circuit as follows: - Locate pins A and B of P2. - Short pin A to pin B. The HEATER indicator should go out. If it does, then check the resistances of RT1 and R2 as detailed in section 4.2.2.

  • Page 19: Principles Of Operation

    Section 5 PRINCIPLES OF OPERATION 5.1. INTRODUCTION The heater control unit in the model 5031 enclosure consists of the following functional blocks: a) Temperature Control - consisting of a sensor, oscillator, amplifier, detector and heater b) Overtemperature Circuit c) Power Supply...

  • Page 20: Temperature Sensitive Oscillator

    Section 5 5.2. TEMPERATURE SENSITIVE OSCILLATOR Figure 5-2: TEMPERATURE SENSITIVE OSCILLATOR Temperature changes are sensed by the thermistor RT1 connected with variable R2 across the 1:2 ratio autotransformer T101. As the temperature decreases, the thermistor resistance increases and the voltage divider output to the base of Q101. As soon as this voltage exceeds half the transformer output, the circuit gain becomes greater than one and oscillation occurs.

  • Page 21: Figure 5-4: Heater Driver

    Section 5 5.4. HEATER DRIVER Figure 5-4: HEATER DRIVER The voltage across C107 causes base current in the emitter follower Q104, which in turn drives another emitter follower Q105. This produces base current to switch on transistor Q7 which controls the heater current. The resistors R119, R121 and R122 ensure that Q7 is not conducting when there is no output from the oscillator.

  • Page 22: Figure 5-6: Power Supply

    Section 5 5.6. POWER SUPPLY Figure 5-6: POWER SUPPLY A universal power transformer T2 allows for operation of the instrument from 110/120 VAC or 220/240 VAC, 50 or 60 Hz, and feeds a full-wave rectifier. The heater is fed from the unregulated output and the control circuit is fed from a regulator consisting of R107, CR101 and C101.

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