Michell Instruments VDS-3 Operating Manual

Vapor Delivery System

VDS3

User’s Manual

97433 Issue 1.2

July 2016

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Use this information when contacting Michell Instruments for service purposes.

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VDS3

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This document is the property of Michell Instruments Ltd. and may not be copied or

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VDS3 User’s Manual

Contents

Safety ................................................................................................................................vi

Electrical Safety ...........................................................................................................vi

Pressure Safety ............................................................................................................vi

Toxic Materials .............................................................................................................vi

Repair and Maintenance ...............................................................................................vi

Safety Conformity ........................................................................................................vi

Abbreviations .....................................................................................................................vii

Warnings ...........................................................................................................................vii

1 INTRODUCTION ................................................................................................1

1.1 Overview ........................................................................................................... 1

2 INSTALLATION ..................................................................................................2

2.1 Enclosure ...........................................................................................................2

2.2 Gas Connections ................................................................................................. 2

2.2.1 Dry Air Inlet .................................................................................................2

2.2.2 Dew-Point Outlet .......................................................................................... 2

2.2.3 Compressed Air ............................................................................................ 2

2.3 Electrical Connections ......................................................................................... 3

2.3.1 Power Supply ...............................................................................................3

2.3.2 PC Control Connection ................................................................................... 3

3 OPERATION ......................................................................................................4

3.1 Filling the Water Container .................................................................................. 4

3.2 'Start-Up' Procedure ............................................................................................4

3.3 Operating Software.............................................................................................5

3.3.1 Dew-Point Control ......................................................................................... 5

3.3.2 Readings ...................................................................................................... 6

3.3.3 Recording ..................................................................................................... 6

4 MAINTENANCE ..................................................................................................8

4.1 Routine ..............................................................................................................8

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VDS3 User’s Manual

Figures

Figure 1 Gas Connections .........................................................................................2

Figure 2 PC Control Connection ................................................................................3

Figure 3 Flow Diagram ...........................................................................................12

Figure 4 Set-Up Connection ....................................................................................14

Appendices

Appendix A Technical Speciﬁ cations ..............................................................................10

A.1 General Arrangement ...................................................................11

A.2 Flow Diagram ..............................................................................12

Appendix B Set-Up Software / Adjustment of Setpoints ..................................................14

B.1 Set-Up Connection .......................................................................14

B.2 About the Software ......................................................................14

B.2.1 Initialization ................................................................................15

B.2.2 Manual Setting of Controllers ........................................................16

B.2.3 Programming the VDS ..................................................................19

Appendix C Quality, Recycling & Warranty Information ...................................................21

C.1 Recycling Policy ...........................................................................21

C.2 WEEE And RoHS Compliance ........................................................21

C.3 Manufacturing Quality ..................................................................21

C.4 Calibration Facilities .....................................................................22

C.5 Return Policy ...............................................................................22

C.6 Warranty .....................................................................................22

Appendix D Return Document & Decontamination Declaration ........................................24

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VDS3 User’s Manual

Safety

The manufacturer has designed this equipment to be safe when operated using the procedures detailed in this manual. The user must not use this equipment for any other purpose than that stated. Do not apply values greater than the maximum value stated.

This manual contains operating and safety instructions, which must be followed to ensure the safe operation and to maintain the equipment in a safe condition. The safety instructions are either warnings or cautions issued to protect the user and the equipment from injury or damage. Use qualiﬁ ed personnel and good engineering practice for all procedures in this manual.

Electrical Safety

The instrument is designed to be completely safe when used with options and accessories supplied by the manufacturer for use with the instrument. The input power supply voltage limits are 220 to 240 V AC OR 100 to 120 V AC 50/60Hz.

Pressure Safety

DO NOT permit pressures greater than the safe working pressure to be applied to the instrument. The maximum safe inlet pressure is 4.8 barg (70 psig).

Toxic Materials

The use of hazardous materials in the construction of this instrument has been minimized. During normal operation it is not possible for the user to come into contact with any hazardous substance which might be employed in the construction of the instrument. Care should, however, be exercised during maintenance and the disposal of certain parts.

Repair and Maintenance

The instrument must be maintained either by the manufacturer or an accredited service agent. Refer to www.michell.com for details of Michell Instruments’ worldwide ofﬁ ces contact information.

Safety Conformity

This product meets the essential protection requirements of the relevant EU directives.

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VDS3 User’s Manual

Abbreviations

The following abbreviations are used in this manual:

AC alternating current atm pressure unit (atmosphere) barg pressure unit (=100 kP or 0.987 atm) (gauge) °C degrees Celsius °F degrees Fahrenheit dp dew point EU European Union Hz Hertz IEC International Electrotechnical Commission Nl/min normal liters per minute mm millimeters lb pound psig pound(s) per square inch (gauge) ppb scfh standard cubic feet per hour USB Universal Serial Bus V Volts W Watts " inches

Warnings

The following general warnings listed below are applicable to this instrument. They are repeated in the text in the appropriate locations.

parts per billion (volume)

Where this hazard warning symbol appears in the following

sections, it is used to indicate areas where potentially hazardous

operations need to be carried out.

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viii 97433 Issue 1.2, July 2016

VDS3 User’s Manual

1 INTRODUCTION

1.1 Overview

The Michell VDS3 Vapor Delivery System is designed for use as part of a hygrometry calibration system. It is capable of repeatable generation of set dew-point levels over the range -100 to +20°C (-148 to +68°F) dew point.

The system is assembled within a small ﬂ oor-mounted 19” equipment rack enclosure ﬁ tted with castors for ease of movement. The system requires a supply of high quality dry gas with a moisture content of better than 1 ppbV (-100°C (-148°F) atmospheric dew point) to enable the maximum range of dew points to be generated. The supply of high quality dry gas can be provided by a Michell PSD4 Pressure Swing Dryer.

The vapor delivery system divides the dry gas into three controllable gas streams. One of these streams passes through a controlled evaporator mixer and is then mixed by volumetric ratios with the other streams to produce different factory pre-set dew point values over the range -100 to +20°C (-148 to +68°F) (user conﬁ gurable). These dew points are selected remotely via a PC.

INTRODUCTION

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INSTALLATION

2 INSTALLATION

2.1 Enclosure

The instrument enclosure is designed for ﬂ oor mounting (19” equipment mini-rack). Castors are ﬁ tted for ease of movement.

Access at the front, left hand side and rear is required for operation. Front and side panels are removable for maintenance & servicing.

2.2 Gas Connections

2.2.1 Dry Air Inlet

The system must be supplied with high quality (oil free) dry compressed air to the same speciﬁ cation as used during its calibration/setup (< 1ppbV (-100°C (148°F) moisture content).

The generator was calibrated/set -up using compressed air supplied from a Michell PSD4 Pressure Swing Dryer.

VDS3 User’s Manual

The input gas pressure is further regulated and controlled by an factory set pressure regulator, located internally. NOTE: This regulator MUST NOT be adjusted!

The gas inlet connection is a stainless steel ¼” Swagelok VCR face seal bulkhead union ﬁ tting located on the rear panel of the unit marked

2.2.2 Dew-Point Outlet

The gas outlet connection is a stainless steel ¼” Swagelok VCR face seal bulkhead union ﬁ tting located on the rear panel of the unit marked

2.2.3 Compressed Air

The system requires a separate supply of oil-free compressed air for operating pneumatic valves and pressurizing the water supply. The compressed air supply can be a normal industrial compressed air quality (i.e. 5 to 7 barg (72 to 101 psig) @ -40°Cdp (-40°Fdp).

The compressed air inlet connection is a stainless steel 6mm Swagelok tube ﬁ tting located on the rear panel of the unit marked COMPRESSED AIR INLET.

GAS INLET.

GAS OUTLET.

bulkhead union

GAS OUTLET (1/4” VCR FACE

COMPRESSED AIR

INLET

(6mm TUBE FITTING)

Figure 1

REAR VIEW

Gas Connections

SEAL FITTING)

GAS INLET (1/4” VCR FACE SEAL FITTING)

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VDS3 User’s Manual

2.3 Electrical Connections

2.3.1 Power Supply

100 to 120 V AC OR 220 to 240 V AC 50/60Hz power supply is required to operate this instrument. Refer to the yellow label located on the rear panel of the unit for the correct supply voltage required.

The power supply connection is via the 3-pin IEC fused plug located on the rear panel of the unit. A 3 core power cable is provided, the free end of which should be wired to a suitable earthed plug or directly via a fused power spur.

Power cable conductors are colored according to the convention: Brown L (Live)

Blue N (Neutral) Green/Yellow E (Earth/Ground)

INSTALLATION

2.3.2 PC Control Connection

Connect the host PC to the VDS via a USB connector located on the rear panel of the unit marked

PC (CONTROL). A 3 meter USB cable assembly is provided and should be

connected as shown below:

VDS3

RS485 (SET UP)

PC (CONTROL)

S4000 Dewpointmeter

RS232

USB Cable

Serial Cable

Connect to spare

USB port

Host PC

Connect to spare COMM Serial port

Figure 2

PC Control Connection

NOTE: Ensure that the S4000 Dewpointmeter is connected to the host PC to enable the software to read and record dew points. If it is not connected the software will not operate correctly.

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