Ulvac EMP-20W User manual

D/N.MJOM117E, 2016SR03 ULVAC CRYOGENICS INCORPORATED
Liquid Nitrogen Generator
Instruction Manual
EMP-20W
Export Control Policy
When applying our refrigerator to a cryocooler for optical sensors, the
cryocooler falls under row 6.A.2.d.2 of the control list established by
The Wassenaar Arrangement, which is equal to row 10(2) of
appended table 1 of Japan’s Export Trade Control Order.
Customers must follow all related rules and regulations such as
Foreign Exchange and Foreign Trade Act and take appropriate
procedures when exporting or re-exporting our refrigerators.

ULVAC CRYOGENICS INCORPORATED I
Introduction
Thank you for choosing our products. This instruction manual gives information and
precautions on handling, installation, operation, and maintenance of the product.
This product is intended for use by qualified personnel who recognize shock hazards and
are familiar with the safety precautions required to avoid possible injury. To ensure proper
use of this product, read this instruction manual carefully and keep this manual close at
hand so that you can use for reference during operation.
If you purchased our other products and/or optional devices with this product, read relevant
instruction manuals carefully.

II ULVAC CRYOGENICS INCORPORATED
Safety Conventions
Our products have been designed to provide extremely safe and dependable operation when
properly used. Following safety precautions must be observed during normal operation and when
servicing them.
Low-temperature area present.
There is a risk of frostbite. Do not touch.
CAUTION
WARNING
A warning describes safety hazards or unsafe practices
which could result in severe injury or loss of life.
A caution describes safety hazards or unsafe practices
which could result in personal injury or equipment damage.
Toxic gas or chemicals used.
There is a risk of severe injury upon contact.
Corrosive chemicals used.
There is a risk of severe injury upon contact.
Flammable gas used.
There is a danger of fire or burn injury.
Explosive gas used.
There is a risk of fire or explosion.
Hazardous voltage .
Electric shock may cause severe injury or loss of life.
Hot heating part present.
There is a risk of burn injury.

ULVAC CRYOGENICS INCORPORATED III
Table of Contents
Safety Instructions ··················································································· 1
Disposal Considerations············································································· 3
1. General Description of the System ····················································· 5
1.1 Liquid nitrogen generator (EMP-20W)·············································5
1.2 Helium gas compressor (model:UW404) ···········································5
1.3 PSA (Pressure Swing Adsorption) Nitrogen Generator (type
GN-15i) ······························································································5
1.4 Membrane Nitrogen Generator (type IM-120)···································5
2. Component Description ···································································· 6
2.1 Front view of EMP-20W (Figure 2-1) ···············································7
2.2 Operation panel of EMP-20W (Figure 2-2)········································7
2.3 Inside view of EMP-20W front door and lower panel
(Figure 2-3) ······················································································· 10
2.4 EMP-20W Electrical circuit（Figure 2-4）····································· 10
3. Flow Diagram ················································································12
4. Specifications·················································································13
4.1 Liquid nitrogen generator···························································· 13
4.2 PSA (Pressure Swing Adsorption) nitrogen gas generator················· 13
4.3 Membrane nitrogen gas generator ················································ 13
5. Utilities ························································································14
5.1 Power source (for EMP-20W)························································ 14
5.2 Cooling water (for EMP-20W)······················································· 14
5.3 Power source for GN-15i (when using GN-15i) ································ 16
5.4 Dry air for IM-120 (when using IM-120) ········································ 16
6. Installation ···················································································17
6.1 Conditions for installation place ··················································· 17
6.2 Connection of GN-15i to power source ··········································· 18
6.3 Dry air connection of IM-120························································ 18

IV ULVAC CRYOGENICS INCORPORATED
6.4 Utility connection of EMP-20W ···················································· 18
7. Electric Wiring···············································································21
8. Operation······················································································23
8.1 Checks prior to operation····························································· 23
8.2 Preparation for operation ···························································· 23
8.3 Shutdown·················································································· 24
8.4 When suspending for long time (for 1 to 2 weeks) and
resuming EMP-20W ··········································································· 24
8.5 Corrective action in the event of an error ······································· 25
9. Dispense Liquid Nitrogen Manually ··················································27
9.1 Connecting liquid nitrogen supply flexible hose ······························ 27
9.2 Supply of liquid nitrogen ····························································· 27
9.3 Disconnection of flexible hose······················································· 28
10. Automatic Transfer of Liquid Nitrogen ··············································29
10.1 Inspections before starting automatic transfer································ 29
10.2 Automatic transfer ····································································· 29
10.3 Time limit of automatic transfer ··················································· 29
11. eco Mode ·······················································································30
11.1 eco mode ··················································································· 30
12. Maintenance and Inspection ····························································31
12.1 Daily inspection ········································································· 31
12.2 Periodical maintenance/inspection ················································ 31
12.3 Regular customer inspection ························································ 32
13. Troubleshooting ·············································································33
14. Accessories ····················································································37
15. Warranty ······················································································38

ULVAC CRYOGENICS INCORPORATED 1
Safety Instructions
To this unit, voltage that would cause electrocution or serious injuries is applied. It is
extremely dangerous to touch the live part inside the unit. Make sure to turn OFF the
main power source before performing installation, maintenance or repair. Contacting
the internal parts that are not insulated may damage human body or equipments such
as electrical shock.
Connect the earth wire to D type grounding.
1. Danger of electric shock: Do not touch
the live
p
art.
2. Danger of oxygen deficiency: Ventilate
well.
Nitrogen gas itself is not toxic to human bodies but it reduces the oxygen
concentration in the atmosphere (the oxygen concentration of 18% or below is defined
as an oxygen-depleted state).Choose a well-ventilated and good-air-circulated
location to install the present unit, and install a ventilator with a capacity of at least
2000 m3/Hr airflow. In addition, do not stay together with a dewar containing liquid
nitrogen in a sealed space, such as an elevator or a car.
3. Danger of explosion: Do not seal LN2.
The volume of nitrogen gas is 700 times of liquid nitrogen. Confining atmospheric
pressure liquid nitrogen in an airtight space produces high-pressure gas as high as
700 Atm, possibly resulting in explosion. Use liquid nitrogen in the condition constantly
open to air.

2 ULVAC CRYOGENICS INCORPORATED
Liquid nitrogen provides temperature as low as -196°C. If liquid nitrogen is directly
handled, frostbites, loss of sight, and others are foreseen. Be sure to wear leather
gloves, goggles, trousers without turnips, etc. to handle liquid nitrogen. In addition,
take care of liquid nitrogen transport piping, too. In this unit, there is a part with
danger of burns if it is touched directly. Carry out maintenance, repair, etc. at least 30
minutes after the unit is stopped.
In this unit, high-pressure Helium gas is filled. To disassemble or dispose of the unit,
parts, and others, be sure to discharge gas (under regular maintenance, there is no
need to discharge gas). In addition, never attempt to install the apparatus under the
atmosphere of hydrochloric acid-based, chlorine gas-based, and other corrosive
gases.
4. Danger of burns or frostbites: Never touch
high temperature and ultra-low temperature area.
5. Danger of Explosion: DON’T expose to corrosive
gases.

ULVAC CRYOGENICS INCORPORATED 3
Disposal Considerations
Disposal of industrial waste is regulated by national or local governments. Follow all
applicable local or national laws, regulations or guidelines when disposing of our
products.
We provide Safety Data Sheet (SDS) of our products upon your request.
Please contact us when necessary.
WARNING
When the refrigerator unit may have pumped toxic or dangerous gases, you must contact
your safety supervisor at the time of disposal, and follow the instructions to remove
hazardous substances before disposing.

4 ULVAC CRYOGENICS INCORPORATED
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