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Oxford Instruments Cryojet - User Manual

Oxford Instruments Cryojet
33 pages
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Operator’s Handbook
Cryojet
Issue 4
January 2001
File reference: CJ250101.DOC
Part number UMC0001
Oxford Instruments
Superconductivity
Tubney Woods, Abingdon,
Oxon, OX13 5QX, England
Tel: +44 (0)1865 393 200
Fax: +44 (0)1865 393 333
E-mail:superconductivity@oxinst.co.uk
www.oxford-instruments.com
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Summary

Description of the System

Sample Flow Unit

Details the dewar leg, transfer tube, coldhead, heat exchanger, and nozzle for sample flow.

Shield Unit

Describes the vacuum-insulated tube, heat exchanger, and nitrogen flow for sample protection.

Stand

Describes the adjustable stand supporting the Cryojet system.

Storage Dewar

Details the 75L dewar for liquid nitrogen storage and its five-port top fitting.

Controller

Explains the controller's function in managing gas flows and jet temperature.

Unpacking and Preparation

Unpacking the System

Lists system components, spares, and optional items; instructs on checking for damage.

Preparing the System for Operation

Details dewar top fitting, positioning, and connecting components for initial setup.

Controller Operation

Control of Flow Rates

Explains how to set sample and shield flow rates using the controller's SET, RAISE, and LOWER buttons.

Control of Jet Temperature

Details three modes: Automatic, Manual, and Heat Exchanger Off, for temperature regulation.

Default Start-up Conditions

Describes Non-Auto Start and Auto-Start modes for controller initialization.

Low Nitrogen Level Cut-out

Explains the sensor that automatically shuts off heaters if liquid nitrogen is low.

System Operation

Suggested Operating Conditions

Provides recommended flow rates and liquid nitrogen levels for optimal performance.

Nozzle Alignment and Alignment Tip

Details methods for precise nozzle positioning relative to the sample.

Filling the Dewar

Instructions for refilling the liquid nitrogen dewar while the system is running.

Measuring Liquid Nitrogen Level

Describes how to use a dipstick to estimate the dewar's liquid nitrogen level.

Warming Up the System

Procedures to prevent ice build-up and warm the system safely when not in use.

Evacuating the Outer Vacuum Chamber (OVC)

Explains the process and necessity of pumping the OVC for thermal insulation.

Calibration of Sample Temperature

Discusses factors affecting sample temperature estimation and advises contacting manufacturer.

Temperature Stability

Describes typical temperature stability and fluctuations during dewar refills.

Icing of Crystal Support and Goniometer

Addresses potential icing on supports and goniometer and suggests remedies.

Computer Control

RS232 Connection Hardware

Details RS232 serial data link connections using D-sockets and required cables.

GPIB (IEEE-488) Connection Hardware

Explains GPIB connections using standard IEEE-488 cables and the need for a GPIB Gateway.

ObjectBench Software Control

Guides on controlling the Cryojet using Oxford Instruments ObjectBench software.

ObjectBench Driver Installation

Step-by-step instructions for installing the Cryojet driver within the ObjectBench environment.

ObjectBench Driver Setup

Details basic commands for setting up the instrument driver, including communication link and address.

ObjectBench Control

Explains controlling the instrument locally via the panel or remotely via computer interface.

Restoring Calibration Parameters

Procedure to restore factory settings using a backup disc and ObjectBench software.

PID Control Term Settings

PID Control Tuning Procedure

Provides a step-by-step guide for optimizing Proportional, Integral, and Derivative control terms.

Liquid Nitrogen Autofill System

Setting Up the Autofill System

Details pressure requirements, connecting the level probe, and attaching the nitrogen hose.

The Solenoid Valve

Describes the operation, indication, and manual control of the autofill system's solenoid valve.

Wiring Information

Shield Unit Wiring

Provides wiring details for the shield unit, including component pins, resistance, and controller output.

Sample Flow Unit (15-way D-connector)

Details wiring for the 15-way D-connector of the sample flow unit, including boiloff heater.

Sample Flow Unit (9-way D-connector)

Details wiring for the 9-way D-connector of the sample flow unit, including coldhead components.

Oxford Instruments Cryojet Specifications

General IconGeneral
BrandOxford Instruments
ModelCryojet
CategoryLaboratory Equipment
LanguageEnglish

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