Cryogenics - LabisCatalogue Number H3-203 H3-206 H3-212 H3-216 H3-220 240, 300, 400 and 500 litres capacity dewars are available on request. Oxygen depletion is a safety issue associated

CryogenicsCryogenics

From storage dewars to coaxial cabling, our extensive range of cryogenic

accessories is designed to meet the needs of scientists using cryogenic

equipment. For cryogen storage, choose from open neck and self-open neck and self-

pressurizing nitrogen storage dewars for general lab use, or a range

of helium dewars for application-specific needs. These are backed by

accessories such as trolleys, adaptors and fittings, gauges, transfer hoses

and dipsticks. Cryogen handling accessories include transfer tubes fortransfer tubes for

liquid helium fills. Coaxial, miniature cabling offers optimal thermalCoaxial, miniature cabling offers optimal thermal

and electrical conductivity for your cryogenic application. We also offerfor your cryogenic application. We also offer We also offer

a range of consumables and accessories for use with cryocoolers and

cryopumps, including compressor adsorbers, cryopump arrays and helium

lines and fittings.

Storage

Handling

Fittings

Electrical

Accessories

Cryocooler

Components

Reference Data

North and South America +1 (888) 553 6616 www.oxinstdirect.com email: [email protected]

68

Cryogenics Storage Nitrogen Dewars

Liquid Nitrogen Narrow Neck DewarsNitrogen Dewars

Open neck and self

pressurizing storage

dewars for general lab use,

minimising boil-off.

Open neck for:

Light weight convenience

Sample storage

Self pressurising for:

Cryogen delivery at high

flow rate

These dewars are lightweight and perform efficiently.

They are constructed from welded stainless steel and come

complete with plug and carrying handles. For transport

trolley options see dewar accessories section.

Technical Data & Catalogue Numbers

Capacity (litres) 25 50

Weight empty (Kg) 13 25

Weight full (Kg) 33 65

Evap. rate/day (litres) 0.7 1.1

Overall height (mm) (H) 610 950

Vessel diameter (mm) (D) 406 406

Neck diameter (mm) (d) NW 50 NW 50

Catalogue Number H3-325 H3-350

Self-Pressurising Liquid Nitrogen Dewars

Low pressure storage and transport containers for liquid nitrogen in research

and industry. Complete with anti pressure control, safety valves, electronic

level gauge and valve safety ring.


Working volume (litres) 30 60 120 160 200

Weight empty (Kg) 36 48 81 95 112

Weight full (Kg) 60 96 178 224 274

Max. Working pressure (bar) 4.5 4.5 4.5 4.5 4.5

Evaporation rate/day (%) 3.30 2 1.20 1.10 0.90

External height (mm) 794 998 1281 1369 1471

External diameter (mm) 410 460 535 640 640

Catalogue Number H3-203 H3-206 H3-212 H3-216 H3-220

240, 300, 400 and 500 litres capacity dewars are available on request.

Oxygen depletion is a

safety issue associated

with nitrogen use. Provide

adequate ventilation and

personnel monitoring. See

the Laboratory Essentials

section of this catalogue.

Level 1 Level 2

For rest of world call Oxford Instruments Direct on +44 (0) 1865 393300 [email protected]

69

Cryogenics Storage Helium Dewars

Liquid Helium Dewars

Low temperature transport and storage containers for liquid helium in

research and industry. Capacities from 30 to 1000 litres. Manufactured

entirely from stainless steel. Supplied complete with top fittings in

various sizes and safety protection features (see chart below).

Helium Dewars

Low boil-off general

purpose dewars for:

Liquid helium storage,

delivery and low

temperature applications

Non magnetic


Working volume (95%) (litres) 30 60 120 250

Weight empty (Kg) 56 74 99 155

Weight full (Kg) 60 81 114 186

Working pressure (bar) 0.5 0.5 0.5 0.5

Evaporation rate/day (%) 2.80 1.70 1.20 1.00

Height (mm) (H) 1175 1250 1560 1625

Diameter (mm) (D) 540 640 640 850

Neck dimension (d) NW 50 NW 50 NW 50 NW 50

Catalogue Number H3-403 H3-406 H3-412 H3-425

500 and 1000 litre capacity dewars are available on request.

3

95

8

74

6

1

2

1 Main Fill Isolation Valve2 Gas Recovery / Vent Valve3 Travelling Valve4 Oscillation Damper5 Primary Relief Valve

6 Secondary Relief Valve7 Pressure Gauge8 Burst Disc9 Travelling Relief Valve


70

Cryogenics Storage Misc. Open Buckets

Aluminium

This series of dewars have been created as a direct response

to the needs of our users. Innovations in LN2 storage include

increased hold time, increased capacity and moulded handle

assembly.

A range of insulated dewars to suit application specific needs:

Narrow neck aluminium for efficient cryogen storage

Wide neck polyethylene for sample storage and easy access

Stainless steel robust design for specific applications such as with cold traps


Capacity (litres) 5 6 10 20 35 38 50

Static hold time (days) 23 30 66 100 140 135 125

Evaporation rate (ltr/day) 0.2 0.2 0.15 0.2 0.25 0.28 0.4

Neck tube diameter (mm) 57 57 57 57 57 127 95

Height (mm) 414 425 584 625 630 691 775

Outside diameter (mm) 222 222 286 380 470 483 470

Weight empty (Kg) 3 3 5.6 10 14 14.5 17

Weight full LN2 (Kg) 7 8 13.6 27 42 45 58

Catalogue Number H3-705 H3-706 H3-710 H3-720 H3-735 H3-738 H3-750

For short-term storage liquid nitrogen or other liquids. Chemical-

resistant HDPE double walls are filled with CFC-free urethane foam

and withstand temperatures from -196°C to + 100°C. Insulated cover

is vented for safety. All sizes feature moulded-in ribs for added safety

when held. Built in spout for easy pouring. Finger grip on bottom for

secure handling. Convenient bail-type handles on 1, 2 and 4 litre sizes.

Polyethylene

Open Dewars


Capacity (litres) 1 2 4 10

I/D at mouth (mm) 95 121 146 197

Inside depth (mm) 194 225 287 394

Over height (mm) 229 260 324 457

Hold time from 75% full (hrs) 9 14 19 29

Catalogue Number H3-801 H3-802 H3-804 H3-810

Level 1 Level 2


71

Cryogenics Storage Misc. Open Buckets

Stainless Steel

This series of vacuum insulated dewars is

manufactured entirely from stainless steel for use

with liquid nitrogen in a wide range of experiments.

These dewars combine strength with vessel

performance, and are ideally suited to laboratory

and industrial applications.

Model H3-110 includes a special lid for use with

cold traps.


Capacity (litres) 1 2 3 6 10 15

Internal diameter (mm) 100 100 185 185 152 250

External diameter (mm) 122 122 200 200 200 300

Internal height (mm) 157 285 160 270 625 360

External height (mm) 177 313 190 300 700 440

Catalogue Number H3-101 H3-102 H3-103 H3-106 H3-110 H3-115

Benefits:

Loss reducing plug cap

Suitable for a wide range

of immersion applications

Can be configured for

cold trap operation

Multi Purpose Nitrogen Dewar

This lightweight 25 litre aluminium nitrogen storage

dewar has a static hold time of 156 days. It is ideal

for laboratory, medical and industrial applications

where a long hold time is required.

Ergonomic design for easy handling and pouring

Compatible with transport trolley and tipping

stand H3-501 (not included)

Nitrogen withdrawal device available on request

Catalogue Number

H3-326


72

Cryogenics Storage Dewar Accessories

Dewar Transport Trolley

For narrow neck nitrogen dewars.

Transport and pouring trolley for 25 litre

dewar only. Tipping trolley for both 25

and 50 litre dewars.

Dewar Accessories

Includes:

Trolleys

Adaptors and fittings

Gauges

Transfer hoses

DipsticksDescription Catalogue

Number

Transport and pouring trolley (left) H3-501

Tipping trolley (right) H3-509

Stainless Steel Flexible Hoses

Suitable for liquid nitrogen transfer when

used with filling extension tubes (H8-401

to H8-404) or phase separator (H3-505 or

H3-506) and suitable end fitting adapter

(H8- 401 to H8-463).

Description Catalogue Number

SS flexible hoses with British BSP swivel nuts at each end

0.375” BSP (female) x 1.5 m long H3-503



0.5” BSP (female) x 2 m long H3-504

0.5” BSP (female) x 3 m long H3-524

SS flexible hoses with US 0.375” NPT (M) connector at one end

0.75” UNF flare (female) x 48” long H3-515

0.75” UNF flare (female) x 72” long H3-525

Level 1 Level 2


73

Cryogenics Storage Dewar Accessories

Miscellaneous Adaptors and Fittings

To suit many dewar types.


Filling extension tubes 0.375” BSP (male) straight x 30cm H8-401

0.375” BSP (male) 900 bend x 30cm H8-402

0.5” BSP (male) straight x 30cm H8-403

0.5” BSP (male) 900 bend x 30cm H8-404

Adaptors: BSP (British) to CGA 295 (US Flare 0.50”, UNF male)

0.375” BSP male - 0.75” UNF female swivel flare H8-422

0.5” BSP male - 0.75 UNF female swivel flare H8-423

0.375” BSP male - 0.75” UNF male flare H8-424

0.5” BSP male - 0.75” UNF male flare H8-425

0.375” BSP female - 0.75” UNF male flare H8-426

0.5” BSP female - 0.75” UNF male flare H8-427

Adaptors: US CGA 295 .5” flare (male) x 0.25” NPT (US) female H8-431

CGA 295 .5” flare (male) x 0.375” NPT (US) female H8-432

CGA 295 .5” flare (male) x 0.5” NPT (US) female H8-433

Adaptors: for British BS341 (5/8” BSP female) CGA580 0.375” NPT (female) to BS341 H8-442

0.50” NPT (female) to BS341 H8-443

Hose Connectors (British): 0.375” BSP male to 0.375” BSP male H8-451

0.375” BSP male to 0.50” BSP male H8-452

0.50” BSP male to 0.50” BSP male H8-453

Hose Connectors (US): 0.375” NPT male to 0.375” NPT male H8-461

0.375” NPT male to 0.50” NPT male H8-462

0.50” NPT male to 0.50” NPT male H8-463

Electronic Float Gauge

Standard Liquid Nitrogen Level Gauge. Simple replacement for ‘float‘ type

gauge in pressurised cryogenic vessels where an accurate and reliable

reading of liquid level is required. Battery powered one piece unit.

Specify dewar depth when ordering.

Catalogue Number

H3-500


74

Cryogenics Handling Dewar Accessories

Phase Separators

Sintered bronzed filter which can be attached to a nitrogen transfer line. Aids liquid nitrogen delivery by

separating liquid from vapour, preventing dangerous splashing.

Dipstick

This simple, yet effective dipstick provides accurate indication of liquid helium depth. Stainless steel

construction with a fine rubber diaphragm, held in place by an ‘O’ ring over the cup-shaped upper end

of the dipstick.

The thermal gradient set up in the tube leads to thermal oscillations, which are felt by the vibration

of the membrane. The frequency of the oscillation with the lower end in liquid helium is noticeably

lower than that when it is in cold gas, allowing the liquid level to be determined easily (in most cases).

The dipstick should not be left in the cryostat when it is not in use because it introduces a large

amount of heat.

Standard length is 1.5m

Catalogue Number

H2-110

Description Catalogue number

British Thread (BSP)

A = 0.375” H3-505

B = 0.5” H3-506

US Thread NPT (F)

A = 0.375” H3-510

Never immerse an open tube

into a liquid cryogen - the

liquid will exit the open end

rapidly.

Dummy Side Arm

Nitrogen side arm for transferring N2 (for use

in place of TTL/LLT)

Catalogue Number

H7-401

Level 1 Level 2


75

Cryogenics Handling Transfer Tubes

General Purpose Transfer Tubes (TTN Series)

A comprehensive range of transfer tubes is

available for normal short duration transfer.

Constructed of high quality stainless steel

tubing, vacuum insulated, they are available in

rigid, demountable and flexible forms.

Typical flow rates of 1 l/min at 0.1 bar are

achieved.

All are supplied with pump out fittings and

removable siphon nozzles. Threaded siphon

leg ends permit use of extension tubes when

required.

These transfer tubes are compatible with dewar

top fitting SV10.

Transfer Tubes

For liquid helium fills

Efficient short transfer

Robust construction

Tip

Precool line from storage

dewar prior to inserting

into cold dewar to be

filled

Evacuation

TTN2F

port

Flexible section

M8 Thread

40 mm

A

9.5

C

9.5

E

Evacuation port

TTN2FDH

Flexible Section

Demountablecoupling

40 mm

M8 thread

A

9.5

C

9.5

Dewar Leg

E

A

9.5

C

9.5

E

M8 Thread

Evacuation port

Dewar Leg

TTN2DH

15.9mm dia.Demountablecoupling

40 mm

Description Dewar Leg Length (A)

Cryostat Leg Length (E)

Span (C) Catalogue Number

TTN2F Standard flexible transfer tube 1.5 m 0.5 m 1.5 m H7-110

TTN2F Standard flexible transfer tube 1.5 m 1 m 1.5 m H7-101

TTN2FDH Standard flexible transfer tube with demountable joint in horizontal section

1.5 m 1 m 1.5 m H7-102

TTN2DH Standard rigid transfer tube with demountable joint in horizontal section

1 m 1 m 1 m H7-103

TTN Phase seperator, 9.5 mm H7-001

TTN Connector bush, 9.5 mm H7-002

Special lengths maybe available on request.


76

Cryogenics Handling Transfer Tubes

LLT LowLoss Technology Transfer TubesLow Loss Transfer Tubes

For use with continuous flow

cryostats.

Inner capillary thermally

shielded by exhaust gas

for low consumption

Needle valve design to

expand and cool LHe to 2

K (subject to flow cryostat

design)

Automatic needle

valve control option:

temperature controller

drives optional motorised

needle valve, resulting in

more stable temperature

control and lower cryogen

consumption

The LLT liquid helium transfer tubes have been

developed specifically for use with Oxford Instruments’

continuous flow (CF) cryostats. These transfer tubes

incorporate the design principles, practices and

materials of our Low Loss technology resulting in

significant user benefits:

a) Savings in running costs due to low liquid helium

consumption

b) Extended operating range to 2 K

c) Automated operation for LLT 650 and LLT 750 models

Use of an LLT transfer line will reduce the consumption

of liquid helium and extend the base temperature of

the cryostat. A base temperature of better than 2.5 K is

normally attainable.

Item Description Dewar leg lengths (A)

Flexible section length (B)

Catalogue Number

LLT600/10 Transfer tube for horizontal feed cryostats 1.0 m 1.2 m H7-301




LLT700/10 Transfer tube for vertical feed cryostats 1.0 m 1.0 m H7-303

LLT700/13 Transfer tube for vertical feed cryostats 1.3 m 1.0 m H7-304

LLT650/10 Automated version of the LLT600/10 1.0 m 1.2 m H7-305






Auto Needle Valve Upgrade Kit

This upgrade kit, for use with the LLT transfer tubes, enables automated cryogen flow control. The kit

comprises a motor/gear box assembly, which replaces the manual adjustment knob. A supplied interface

cable connects the motor to an Oxford Instruments temperature controller.

The temperature controller determines the proper

cryogen flow and heater current to obtain optimum

cryostat performance at the established temperature

target. Thus the automated needle valve provides

hands-off cryostat operation from 2 K to 500 K.


Full motor kit H7-050

Replacement motor H7-051

Level 1 Level 2


77

Cryogenics Handling Transfer Tube Accessories

Transfer Tube Accessories

A range of upgrade items

and accessories for use with

cryogen transfer tubes

Dewar Top Fittings

The SV fitting provides an interface between

a transfer tube and the storage vessel neck.

The fitting includes a pressurising point (1) for

connection to either a helium gas line or rubber

bladder, and a vent valve (2).

The SV fitting adapts to vessel necks with either

a standard NW 25 flange or a plain 19 mm

diameter tube. The SV10 suits all transfer tubes

with a 9.5 mm diameter leg while the SV12 is

for the LLT and TTL product range which have

12 mm legs.


Euro

SV10 H8-210

SV12 H8-212

US

for 3/8” transfer tube H8-213

for 1/2” transfer tube H8-214

US Dewar Top Fitting

Cap O-Ring Washer Body

Item Description Dewar leg lengths

Flexible section length

CatalogueNumber

TTL200/10 Lightweight flexible flow cryostat transfer tube 1.0 m 1.2 m H7-201

TTL200/13 Lightweight flexible flow cryostat transfer tube 1.3 m 1.2 m H7-202

TTL Lightweight Transfer Tubes

The TTL type transfer siphon is designed for use when

flexibility and light weight are primary considerations. The

gas flow is exhausted from the side arm of the sample

cryostat through a vent port. This enables a lightweight and

flexible design but increases the base temperature cryogen

consumption by approximately 20%.

TTL 200 Series


78

Cryogenics Handling Transfer Tube Accessories

Entry Adaptor

Adaptor for connecting a transfer tube

to a continuous flow cryostat. Oxford

Instruments style transfer tubes (LLT and TTL

models) with 12.7 mm diameter entry arms

are compatible.

Catalogue Number

H8-311

TTN Transfer Tube Extension

Catalogue Number

H7-150

All TTN series transfer tubes are

supplied with M8 thread fitting

allowing the attachment of an

un-insulated extension tubes. This

part has a length of 250 mm and is

easily shortened if necessary.

Pump-out Fitting

The pump-out fitting allows evacuation of all

our transfer tubes except those fitted with

KF16 flange.

Catalogue Number

H8-101

Sealing Olives (PTFE)

The olive is fitted to flow cryostat end of transfer tube to provide a

seal between cryogen feed and cold gas return. Failure to use olive will

result in little or no cooling within the cryostat. This replacement washer

is suited for the LLT and TTL transfer lines.

Catalogue Number

H7-350

Level 1 Level 2


79

Cryogenics Handling Gas & Liquid Handling

Electronic ManostatGas and Liquid Handling

Accessories to provide gas

flow control, measurement

and conditioning.

Includes:

Pressure Control

Benefits for NMR

Magnets:

Tighter temperature

control of magnet

Lower magnetic field

inhomogeneity

Higher spectral resolution

for sensitivity experiments

The manostat is an automatic pressure controller designed to

control the pressure in a cryostat reservoir when operating below

atmospheric pressure (i.e. below the normal boiling point of the

cryogen), thus maintaining a constant temperature.

Operating principle

As the cryostat pressure falls below the reference pressure the

diaphragm closes the control orifice and restricts the pumping

speed, maintaining a constant pressure.

Temperature stability of better than ±0.1 K can be maintained over long periods in helium cryostats

over the range 1.5 to 4.2 K.

This unit provides electronic control of the control valve. Thus, desired pressure conditions are

maintained continuously. An alarm function monitors the difference between the setpoint and the

measured pressure value. The instrument also features a self-check

and diagnosis procedure. The unit can be remote controlled via a

RS-232 port and/or configured for use with Labview.

Catalogue Number

H6-104

VC31 Gas Flow Controller

The VC31 flow controller is designed to monitor helium gas

flow and consists of a vacuum gauge, needle valve and flow

meter. The gas passes through the needle valve to the gas

pump and then through the flow meter (0 to 2.5 equivalent

liquid litres/hr) on its way to the recovery line.

The flow controller should be used in conjunction with the

GF3 or GF4 pump. (Page 80)

Ten meters of 10 mm tubing (Catalogue

number: H1-304) are supplied with the

controller.Catalogue Number

H6-131

VC41 Gas Flow Controller

The VC41 flow controller is similar to the VC 31, however it

contains two coupled flow meters, one calibrated for helium

gas (0 to 2.5 litres/hr, liquid equivalent), the other for nitrogen

(0 to 5 litres/min, gas flow).

Ten meters of 10 mm tubing (Catalogue

number: H1-304) are supplied with the

controller.

Catalogue Number

H6-141


80


Nitrogen and Helium Flow MetersTip

Monitor dewar boil-off with

precision to track progress of

cool-down and presence of

potential problems such as

vacuum leaks.

Variable area laboratory gas

flow gauge for cryogen boil-off

measurements. Range as indicated

in the table. Cast metal base and

hose fittings included.

Gas Flow (L/min) Catalogue Number

Nitrogen 1 - 12 H6-212

Nitrogen 6 - 60 H6-213

Helium 0.2 - 1.8 H6-210

Helium 1 - 9 H6-211

Service Kits

A service kit containing elements, filters, screws, valves and

valve retainers for general maintenance. Pump diaphragm

should be ordered separately for GF2 or 3.

Decscription Catalogue Number

GF3 H4-320

GF4 H4-420

Oil Free Pumps

The GF3 diaphragm pump and GF4 pump are suitable for continuous flow

cryostats and variable temperature systems as they are oil free, and minimise

contamination of the helium return line. Use with our gas flow controllers

(Catalogue numbers H6-131 and H6-141) for best performance.

Power Requirement & Catalogue Numbers

Unit Supply Voltage Starting Current Continuous Power Catalogue Number

GF3 110V AC, 50/60 Hz 9.5 A 370 W H4-311

GF3 240V AC, 50/60 Hz 4 A 370 W H4-312

GF4 220/240V AC, 50 Hz 2 A 250 W H4-411

GF4 100/120V AC, 60 Hz 3.8 A 250 W H4-412

GF3 Leak rate (air to pump) <0 ml/min

GF3 Flow rate >42 litres/min at 1000 mbar

<200 mbar at 0 litres/min

GF4 Flow rate 70 litres/min at 1000 mbar

<200 mbar at 0 litres/min

GF2/3 Pump Diaphragm

Replacement diaphragms for the GF2 or GF3 pump. Description Catalogue Number

GF2 H4-321

GF3 H4-322

GF3 pump pictured

Level 1 Level 2


81


Oil Mist Filter Housing

Sealed aluminium housing accommodates oil mist filter

(H5-101 or H5-102). Equivalent to equipment used on the

Kelvinox dilution refrigerator.


NW16 H5-116

NW40 H5-140

Oil Mist Filter Replacement Elements

Replacement part for Kelvinox dilution refrigerator.

For single element applications, use the fine filter.

Where two housings are in series, the first housing

contains a coarse filter element.


Fine H5-101

Coarse H5-102

Rubber Bladder

Used for pressurising dewars in the transfer of liquid helium.

Catalogue Number

H6-101

Direct-acting Cryogenic Solenoid Valve

This direct-acting solenoid valve is specifically

designed for cryogenic operation. The design

incorporates a high-strength forged brass body

with a sealed stainless steel plunger on a P.T.F.E.

seating.

The valve may be used to switch liquid nitrogen

and liquid argon (not oxygen) with a service

pressure up to 2.8 Kg cm2 and is ideally suited

to level control applications in, for instance, cold

traps for pumping systems.

Applications

Switching liquid nitrogen and liquid argon,

interfacing directly with Oxford Instruments

nitrogen level meters.

Operation

Normally closed, opens when energised.

Specification

Voltage 110, 240 V 50-60 Hz

Coil Continuous duty class B moulded

Fittings 0.25” BSP 6 mm orifice

Valve body Forged brass

Internal parts Stainless steel

Operating pressure Maximum 58 psi (2.8 Kg cm²)

Safe working pressure Maximum 290 psi (35 Kg cm²)

Approximate shipping weight 0.35 Kg


110V valve H4-211

240V valve H4-212

Documents

Cryogenics - LabisCatalogue Number H3-203 H3-206 H3-212 H3-216 H3-220 240, 300, 400 and 500 litres capacity dewars are available on request. Oxygen depletion is a safety issue associated