Precision Hydrogen SL (All Models)
User Manual

Copyright © Peak Scientific Instruments Ltd 2024 — Precision Hydrogen SL User Manual Rev 13 RSID 3516 EN —18/10/2024

Contents
Change History
How to use this Manual
Safety Notices
Symbols
Safety Notice to Users
General Safety
Generator Safety Features
Health and Safety Data
De-ionizer Resin
DesiccantMolecular Seive
EU Declaration of Conformity
UK Declaration of Conformity
CSA Compliance Statement
WEEE Compliance Statement
European Union (EU) and United Kingdom (UK) Class A Compliance statement
FCC Class A Compliance Statement
Industry Canada Class A emission compliance statement
Korea Communications Commission (KCC) statement
Warranties and Liabilities
Technical Specification
Introduction
Principle of Operation
UnpackingFittings Kit Contents
Installation
Location
Generator Overview
General Dimensions
Unit Controls
Rear Connections
Tubing
H2 Ventilation
Water Quality
Manual Water Tank Filling
Automatic Filling (Automatic Fill Upgrade units only)
Pressurized Filling (Automatic Fill Upgrade units only)
Draining the Water Tank
Water Usage
Electrical Connection
Start-up Sequence
Liquid Leak Detectors
Gas Traps
Switching the Unit Off
Cleaning
De-ionizer cartridge Replacement
Replacement of Desiccant CapsuleService Requirements
Service Schedule
Service Plans
General Troubleshooting
Overview of LED Colour States
Debugging by LED

Page 2

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Change History
Rev
1

Comment
Initial Release

Name
L. Couttie

Date
10/04/2020

2

Product Updates

L. Couttie

20/01/2021

3
4

Product Updates

L. Couttie

10/03/2021

Product Updates

L. Couttie

26/03/2021

5

Flow Rate Update

C Denholm

07/10/2021

6
7

Declarations Update
Dryer Cap Removal Tool Added

L. Couttie
L. Couttie

13/12/2021
05/05/2022

8

Draining the Water Tank

L. Couttie

26/07/2023

9

Declarations Update

L. Couttie

03/10/202311

water Filter removal

D lai

19/10/2023

12

Dessicant Capsule Update

C. Denholm

03/09/2024

13

Text Update

D.Lai

18/10/2024

10

How to use this ManualThis manual is intended for end users and has been written so that it can either be readas a step by step guide to installation and usage or as a reference document where you
can skip to the relevant information.
Users of a hard copy version can refer to the contents page to find the relevant
information. Users of the soft copy version can use the hyperlinks from the contents
page as well as the hyperlinks between sections.
Please review each of the following sections carefully.
Thank you for selecting Peak Scientific to meet your gas generation needs, and should
you require any further assistance or support please do not hesitate to contact Peak
Scientific or the Peak Partner from which you purchased your Generator.

Page 3

Safety Notices
Peak Scientific Instruments cannot anticipate every possible circumstance which may
represent a potential hazard. The warnings detailed within this manual refer to the most
likely potential hazards, but by definition cannot be all inclusive. If the user employs anoperating procedure, item of equipment or a method of working which is not specifically
recommended by Peak Scientific, the user must ensure that the equipment will not bedamaged or become hazardous to persons or property.

Symbols
This manual uses the following symbols to highlight specific areas important to the safeand proper use of the Generator

WARNINGA WARNING notice denotes a hazard. It calls attention to an operating procedure,
process or similar, which if not correctly performed or adhered to, could cause
personal injury or in the worst case death. Do not proceed beyond a WARNING
notice until the indicated conditions are fully understood or met.

CAUTIONA CAUTION notice denotes a hazard. It calls attention to an operating procedure,
process or similar, which if not correctly performed or adhered to, could cause
damage to the generator or the application. Do not proceed beyond a CAUTION
notice until the indicated conditions are fully understood or met.
Caution, risk of electric shock. Ensure power to the generator has been removed
before proceeding.

Safety Notice to Users

WARNINGWARNING

These instructions must be read thoroughly and understood before
installation and operation of your Peak Precision Hydrogen Generator.
Use of the generator in a manner not specified by Peak Scientific MAY
impair the SAFETY provided by the equipment.
When handling, operating or carrying out any maintenance, personnel
must employ safe engineering practices and observe all relevant local
health and safety requirements and regulations. The attention of UK
users is drawn to the Health and Safety at Work Act 1974, and theInstitute of Electrical Engineers regulations.
If the equipment is used in a manner not specified by the manufacturer,
the protection provided by the equipment may be impaired.

WARNING

Page 4

Attention - Important Notice to All Users

WARNING

These instructions must be read thoroughly, section by section andunderstood before installation and operation of your Peak ScientificHydrogen Generator. Please follow the appropriate safety standards forhandling hydrogen gas and other gases as determined by the laws andregulations of your country.
Generator is for indoor use only.

WARNING

Please save the product packaging for storage or future shipment of the generator.
1. For your own personal safety and to prevent accidental damage to your generator
please ensure that you read and understand our User Manual.
2. Do not store away the generator when not in operation. External water bottles must
be made of a dark coloured glass or Nalgene in order to prevent biological growth(available from Peak Scientific). It is recommended that you check the water quality
weekly to prevent biological growth developing in the tank and tubing. Failure to
do this will greatly reduce the life of the generator and render the 2 year generator
warranty void.
3. If you are using a manual fill system, the tank cap must be replaced after filling thetank with water.
4. If your system requires an external tank, do not place the external water bottle above
the height of the generator. The bottle may be placed at the same level or below thegenerator.
5. Use ASTM Type I or Type II water only. (<1 µS/cm conductivity / >1 MΩ-cm resistivity).
Failure to use the correct quality water will invalidate the cell and system warranty.
6. Failure to maintain the de-ionizer cartridge as recommended will reduce theoperational life of your generator and render its 2 year generator warranty void.
7. Do not attach any additional tanks or gas cylinders to your generator without first
consulting Peak Scientific.
8. Ensure your entire installation, both pipe work and analysers, are completely gas
tight. Even minor leaks will affect the operation of your generator and can reduce
its operational life.
9. Check that the output capacity of your generator meets the total gas requirementsof your application. If in doubt, consult your dealer or Peak Scientific.
10. Ensure the ambient temperature inside your laboratory does not rise above
35°C/95°F. Extremes of operating temperature will reduce cell life.

Page 5

General Safety
The generator produces gas when the application places a demand on the unit. The
maximum quantity of hydrogen stored in the generator at any one time is 175ml
at a pressure of 7.6bar (110psi). The unit also meets the European Electromagnetic
Compatibility and Low Voltage Directives. The Generator is CE approved and has theCE mark attached.
All of the Precision Hydrogen Series generators have the necessary control circuitry,
both hardware and software, to ensure the shutdown of the instrument in the event of a
fault or faults occurring.
The rear section of the generator should only be opened by trained
personnel in line with maintenance instructions.

Generator Safety Features
The Precision Hydrogen range have the following safety features to ensure safe andreliable operation:•

Overpressure switch.

•

Safe and accurate control of pressure.

•Internal leak detection.

•

Cell shut down in critical alarm status.

•

Critical water level detection.

•

Internal water overflow prevention.

Page 6

Health and Safety Data
De-ionizer Resin
This sheet to be retained by the ‘Health & Safety Officer’
The recipient of this Health & Safety Data sheet is required to ensure that all personnel
handling, using or likely to come into contact with the material are made aware of the
Health & Safety information contained herein.
General Description
Cylinder containing ion exchange resin. 60% Cation and 40% Anion by mass.
Chemical Components
Polystyrene divinylbenzene cation and ion exchange resin.
Form 				Solid beads				Flash Point 			N/AColour				TanIgnition Temperature

427 °C (Estimated)

Odour				None
Explosion Limits 		N/ADecomposition Temperature Over 220 °C
Vapour Pressure @ 25 °C

17mm CFH @ 20 °C (Water)

Viscosity @ 25°C 		N/A			
Solubility in Water		 Negligible
Specific Gravity @ 25°C

1.1-1.3

pH @ 25 °C 			

7-9.5 in aqueous slurry

Eye Protection			

Safety Glasses (BS2092C)

Storage				Store in a cool place above 0 °C, out of direct sunlightFire & Explosion Hazards
Toxic combustion products may include sulphur dioxide					and sulphur trioxide
Disposal				This product can be disposed as ordinary waste if local					regulations permit
Emergency & First Aid Procedures
Spillages
Floor may be slippery. Use care to avoid falls. Wear protective glasses.
Sweep up and transfer to containers for recovery and disposal.
Extinguishing Media
Carbon Dioxide (CO2), Water Fog and Dry Powder.
Fire Fighting and Protection
Wear HSE approved, pressure demand, self-contained breathing apparatus or equivalent.
Page 7

First Aid
Skin Contact
Wash effected areas with soap and water. Consult doctor if irritation persists.
Eye Contact
Product can cause severe eye irritation. Flush eyes with large amounts of water for atleast 15 minutes. Consult a doctor if irritation persists.
Inhalation
This product should present no hazard if operated under normal conditions. If irritation
persists, move patient to fresh air.
Ingestion
If resin has been confined to the mouth, administer 250 ml. of water as a mouthwash.
Avoid swallowing. This product is considered non-hazardous if ingested in small
amounts; however, it is advisable to seek medical advice.
Toxicological Data
No toxicity data available on this product
Occupation exposure limits
STEL/TLV = None established.
Incompatible Materials (to avoid hazardous reactions)
Avoid contact with concentrated nitric acid and any other strong oxidising agents at all
times.

Page 8Desiccant
This sheet to be retained by the ‘Health & Safety Officer’
The recipient of this Health & Safety Data sheet is required to ensure that all personnel
handling, using or likely to come into contact with the material are made aware of the
Health & Safety information contained herein.
General Description
Column containing orange to green indicating silica gel.
Chemical Components
Amorphous silica 98.2%, activated colouring agent 0.2% max.
Form 				Beads				Flash Point 			N/AColour				Dry: yellow/orange
Ignition Temperature		

Saturated: Green>1000 °C

Odour				Odourless
Explosion Limits 		N/ADecomposition Temperature Over 155 °C
Vapour Pressure @ 25 °C

17mm CFH @ 20 °C (Water)

Viscosity @ 25°C 		N/A			
Solubility in Water		less 1.0% in weight

pH @ 25 °C 			

2-10 at 5% w/w in water

Eye Protection			

Safety Glasses (BS2092C)

Storage				All containers must be closed air tight and kept in a dry					place.
Fire & Explosion Hazards

N/A

Disposal				This product can be disposed as ordinary waste if local					regulations permit.
Emergency & First Aid Procedures
Spillages
Contain spillage. Collect in suitable containers for recovery or disposal. During collection
avoid creating dust.
Extinguishing Media
N/A. Inorganic compound. Not combustible.
Fire Fighting and Protection
Wear HSE approved, pressure demand, self-contained breathing apparatus orequivalent.

Page 9First Aid
Skin Contact
Wash spillage from skin with soap and water.
Eye Contact
Wash immediately with copious amounts of water and obtain medical attention.
Inhalation
Remove from source of exposure.
Ingestion
Wash out mouth with water. If large amount swallowed or symptoms develop obtain
medical attention.
Toxicological Data
The lethal dose for humans for synthetic amorphous silica is estimated at over 15,000
mg/kg
Occupation exposure limits
DNEL/PNEC < 1 = No immediate concern.
Incompatible Materials (to avoid hazardous reactions)None known.

Page 10

Molecular Seive
This sheet to be retained by the ‘Health & Safety Officer’
The recipient of this Health & Safety Data sheet is required to ensure that all personnel
handling, using or likely to come into contact with the material are made aware of the
Health & Safety information contained herein.
General Description
Column containing white to tan molecular sieve.
Chemical Components
Quartz (SiO2) <10%, balance Zeolite.
Form 				Spheres				Flash Point 			N/AColour				White to tan
Ignition Temperature		N/A

Odour				Odourless
Explosion Limits 		N/ADecomposition Temperature N/A
Vapour Pressure @ 25 °C

N/A

Viscosity @ 25°C 		N/A			
Solubility in Water		 Insoluble
pH @ 25 °C 			N/AEye Protection			

Safety Glasses (BS2092C)

Storage				All containers must be closed air tight and kept in a dry					place.
Fire & Explosion Hazards

N/A

Disposal				This product can be disposed as ordinary waste if local					regulations permit.
Emergency & First Aid Procedures
Spillages
Contain spillage. Collect in suitable containers for recovery or disposal. During collection
avoid creating dust.
Extinguishing Media
N/A. Inorganic compound. Not combustible.
Fire Fighting and Protection
Wear HSE approved, pressure demand, self-contained breathing apparatus orequivalent.

Page 11First Aid
Skin Contact
Wash spillage from skin with soap and water.
Eye Contact
Wash immediately with copious amounts of water and obtain medical attention.
Inhalation
Remove from source of exposure.
Ingestion
Wash out mouth with water. If large amount swallowed or symptoms develop obtain
medical attention.
Toxicological Data
The lethal dose for humans for synthetic amorphous silica is estimated at over 15,000
mg/kg
Occupation exposure limits
DNEL/PNEC < 1 = No immediate concern.
Incompatible Materials (to avoid hazardous reactions)None known.

Page 12

EU Declaration of Conformity
We			

Peak Scientific Instruments Ltd.

Of			

Fountain Crescent, Inchinnan, Renfrewshire, PA4 9RE

Hereby declare that, this declaration of conformity is issued under the sole
responsibility of the manufacturer.
Equipment Type:		

Hydrogen Generator

Model Designator:

Precision Hydrogen SL

To which this declaration relates, is in conformity with the following applicable EU
Directives, harmonized standards, and other normative requirements.
•

Low Voltage Directive 2014/35/EU
EN 61010-1: 2010/ A1:2019 Safety Requirements for Electrical Equipment for
Measurement,
Control and Laboratory Use.		

•Electromagnetic Compatibility Directive 2014/30/EU
EN 61326-1: 2013 Electrical Equipment for Measurement, Control and Laboratory Use– EMC Requirements. (Class A)•

Restriction on the use of certain hazardous substances in electronic equipment(RoHS) Directive 2011/65/EU as amended by EU 2015/863.

Signed for and on behalf of Peak Scientific by		
Signed:				
Name:

Fraser Dunn

Position:

Design Engineering Manager

		Peak Scientific Instruments ltd,		Inchinnan, Renfrew, Scotland, PA4 9RE, UK.

Date:		

7th October 2021

Page 13

UK Declaration of Conformity
We			

Peak Scientific Instruments Ltd.

Of			

Fountain Crescent, Inchinnan, Renfrewshire, PA4 9RE

Hereby declare that, this declaration of conformity is issued under the sole
responsibility of the manufacturer.
Equipment Type:		

Hydrogen Generator

Model Designator:

Precision Hydrogen SL

To which this declaration relates, is in conformity with the following applicable UK
Statutory Instruments, Standards and other normative requirements.
•

The Electrical Equipment (Safety) Regulations 2016 (SI 2016 / 1101) as amended.
BS61010-1:2010 / A1:2019 Safety Requirements for Electrical Equipment for
Measurement Control and Laboratory Use.

•

The Electromagnetic Compatibility Regulations 2016 (SI 2016 / 1091) as amended.
BS61326-1:2013 Electrical Equipment for Measurement , Control and Laboratory Use– EMC Requirements. (Class A)•

The Restriction of the Use of Certain Hazardous Substances in Electrical andElectronic Equipment Regulations 2012 (SI 2012 / 3032) as amended.

Signed for and on behalf of Peak Scientific by		
Signed:				
Name:

Fraser Dunn

Position:

Design Engineering Manager

		Peak Scientific Instruments ltd,		Inchinnan, Renfrew, Scotland, PA4 9RE, UK.

Date:		

7th October 2021

Page 14

CSA Compliance Statement
CSA Group (Canadian Standards Authority) is a Nationally Recognised Testing
Laboratory (NRTL), headquartered in Toronto Canada.
They are authorised to evaluate product to both their own and Underwriters Laboratory(UL) standards and certify the product to be in compliance to the relevant standards.
Peak products are certified to the current in force revision of the following standards
in order to cover both Canadian and United States requirements for “Safety
Requirements for Electrical Equipment for Measurement, Control and Laboratory use,
Part 1: general Requirements”.
Canada:CAN/CSA C22.2 No 61010-1-12

United States:

UL 61010-1

As a result the products covered by this statement are certified and listed by CSA
accordingly and are entitled to carry the CSA mark with both Canadian and UnitedStates subscripts , as shown below on the product rating label.

Page 15

WEEE Compliance Statement
The Waste Electrical and Electronic Equipment (WEEE) Regulations SI 2013 No 3113
and or the Waste Electrical and Electronic Equipment (WEEE) Directive 2012/19/EU
apply to all electrical and electronic equipment placed on the market in the UK and EU
covered by the scope of regulations which can be found in the Government GuidanceNotes (PDF) produced by the Department for Business Innovation and skills for the UK
and here for Europe.
All PEAK products that are subject to the WEEE directive are compliant with the
WEEE marking requirement. Such products are marked with the “crossed-out wheeliebin” symbol (shown below) in accordance with European standard EN50419. All
old electrical equipment can be recycled. Please do not dispose of any electricalequipment (including those marked with this symbol) in general rubbish bins. Pleasecontact your dealer or distributor for clarity.

Page 16

EMC Class A Compliance Statements
European Union (EU) and United Kingdom (UK) Class A CompliancestatementThis is a Class A product. In a domestic environment this product may cause radio
interference in which case the user may be required to take adequate measures.

FCC Class A Compliance Statement
This equipment has been tested and found to comply with the limits for a Class A
digital device, pursuant to part 15 of the FCC Rules. These limits are designed toprovide reasonable protection against harmful interference when the equipment is
operated in a commercial environment. This equipment generates, uses, and can radiateradio frequency energy and, if not installed and used in accordance with the instruction
manual, may cause harmful interference to radio communications. Operation of thisequipment in a residential area is likely to cause harmful interference in which case theuser will be required to correct the interference at his own expense.

Industry Canada Class A emission compliance statement
This ISM device complies with Canadian ICES-001 (A).
Cet appareil ISM est conforme à la norme NMB-001 (A) du Canada.

Korea Communications Commission (KCC) statement이 기기는 업무용(A급)으로 전자파적합기기로서 판매자 또는 사용자는 이 점을 주의하시기
바라며, 가정외의 지역에서 사용하는 것을 목적으로 합니다.
(This is electromagnetic wave compatibility equipment for business (Type A). Sellers
and users need to pay attention to it. This is for any areas other than home.)
Page 17

Warranties and Liabilities
1. The Company warrants that it has title to the Goods.
2. Subject to the provisions of this clause the Company warrants that the Goods 		
shall comply in all material respects with any specification referred to in the Order
Confirmation (as the same may be amended) and shall, subject thereto, be free 		from defects in material and workmanship for the lesser of a period of twenty-fourmonths from the date of delivery or twenty-five months from the date of dispatch
from the factory. The 24m warranty is conditional on completion of replacement of thede-ionizer cartridge every 12 months from the date of first use of the generator and useof the correct grade of deionized water (ASTM type II, <1 µS/cm conductivity / >1 MΩ-cm
resistivity). Failure to change the de-ionizer cartridge and supply the correct grade of
de-ionized water will render the 24 month warranty null and void.
3. Save as provided in this clause and except where the Goods are sold to a person 		
dealing as a consumer (within the meaning of the Unfair Contract Terms Act 		1977) all warranties, conditions or other terms implied by statute or common
law are hereby expressly excluded save to the extent they may not be lawfully
excluded. When the Goods are sold to a consumer within the meaning of the Unfair
Contract Terms Act 1977 their statutory rights are not affected by the provisions of
this clause.
4. In the event of the Customer making a claim in respect of any defect in terms of 		clause 2 hereof the Customer must.
1. Reasonably satisfy the Company that the Goods have been properly installed,commissioned, stored, serviced and used and without prejudice to the generalityof the foregoing that any defect is not the direct or indirect result of lack of repair
and/or servicing, incorrect repair and/or servicing, use of wrong materials and/or
incorrect spare parts
2. Allow the company to inspect the Goods and/or any installation and any relevant
packaging as and when reasonably required by the Company.
5. Subject to the Company being notified of any defect as is referred to in sub-		
clause 2 hereof within a reasonable time of it becoming apparent and subject always
to the terms of sub-clause 3 hereof, the Company shall, in its option, replace or repair
the defective Goods or refund a proportionate part of the Price. The Company shallhave no further liability to the Customer (save as mentioned in sub-clause 4 hereof).
6. The Company shall be liable to indemnify the Customer in respect of any claim
for death or personal injury to any person in so far as such is attributable to thenegligence or breach of duty of the Company or any failure by the Company tocomply with the provisions of sub-clause 2 hereof.
7. Save as provided in sub-clause 2 hereof the Company shall not be liable in respectof any claim by the Customer for costs, damages, loss or expenses (whether direct,
indirect, consequential or otherwise) or indemnity in any respect howsoever arising
including, but not by way of limitation, liability arising in negligence (other thanpursuant to clause 5 above) that may be suffered by the Customer or any third party.

Page 18

Technical Specification
Precision Hydrogen SL
Environment
100 ccMinimum Operating Ambient Temperature
Maximum Operating Ambient Temperature
Maximum Altitude
Maximum Relative Humidity
Minimum Storage Temperature*
Maximum Storage Temperature*

200 cc10°C (50°F)
35°C (95°F)
3000 m
90% Non-Condensing
10°C (50°F)
25°C (77°F)

Generator Outlets
Max Flow Rate
PurityGas outlet
Delivery pressure

100 cc/min

200 cc/min

99.9995%
1 x 1/8” Swagelok compression fitting
100 psi (6.9 bar)**Electrical Requirements
VoltageFrequency
Current
Input Connection
Power Cord (Supplied)
Pollution Degree
Installation / Over Voltage Category

100-240VAC +/-10%
50/60 Hz
6A Max.
C14 Connection
C13 socket to local connection (10A minimum)
2
II

GeneralGenerator Dimensions cm
Generator Weight
Shipping Crate Dimensions cm
Shipping Weight
Heat Output
Water Purity Requirement

16.0 (6.3”) x 38.5 (15.2”) x 25.0 (9.8”)
8 kg (17.6 lbs)
73 (28.7”) x 52 (20.5”) x 37 (14.6”)
23.2 kg (51.1 lbs)
983 BTU / Hr
ASTM Type II (<1 µS/cm / >1 MΩ-cm)* When taken out of storage the Generator should be allowed to acclimatize at room
temperature for a minimum of 3 hours before operation.
** Delivery pressure for models with P/N 3305336, 3305337, 3305338 & 3305339 is
70psi (4.8 bar)

Page 19

Introduction
Precision Hydrogen SL has been developed to provide a source of high purity hydrogengas, suitable for GC detector gas supply.
Features include:•

Easy to use single button interface•

Status indicative lighting feature•

Purities of up to 99.9995%

Precision Hydrogen SL is based on proven technology, producing hydrogen byelectrolysis using a Proton Exchange Membrane (PEM) cell. Moisture removal is achievedby a two-stage patented Nafion technology and dessiccant drying.
To ensure this generator model meets our high expectations with regards to reliability
and performance, we have tested this model extensively at our manufacturing plant andin the field to ensure reliability and longevity of the system.

Page 20

Principle of Operation
The Peak Scientific hydrogen generator produces high purity hydrogen gas, H2.
Hydrogen does not occur naturally on earth and must be formed via the decompositionof other molecules, in this case via the splitting of water molecules into hydrogen andoxygen in a process known as electrolysis.
The electrolyser used in the Peak Scientific hydrogen generator is known as a Proton
Exchange Membrane (PEM) electrolyser. This type of electrolyser was first describedin the mid-1960’s by General Electric as a method for producing oxygen for the Gemini
space program. PEM electrolysis has been continually developed since its introduction
and has remained the state-of-the-art technology for water electrolysis and the
production of high purity hydrogen ever since.
The most important element of the generator is the electrolyser cell where theelectrolysis reaction takes place. This consists of two electrodes (an anode and acathode), which are separated by the proton exchange membrane which gives thetechnology its name. During operation deionised water is fed to the anode of theelectrolysis cell where it is split into oxygen, protons and electrons with the aid of a
precious metal catalyst. The oxygen is vented to atmosphere from the generator. The
protons travel across the membrane and simultaneously the electrons travel around theexternal electrical circuit. These protons and electrons then recombine at the cathode ofthe electrolyser, again with the aid of a precious metal catalyst to produce the hydrogengas. The high purity of the hydrogen is assured by the membrane which completely
separates the hydrogen produced at the cathode from the oxygen being produced at
the anode. These processes are described by the following equations:
Anode Reaction
H2O(l)			

½O2(g) + 2H+(aq) + 2e-

Cathode Reaction
2H+(aq) + 2e-			H2(g)Deionised water is critical to the operation of the system and must have a purity of
ASTM Type II or better to prevent damage to the membrane. Failure to use this gradeof deionised water will invalidate the 2 year warranty of your generator. The water is
automatically loaded (either at power up or periodically during operation) and the rate
at which the water is consumed depends on the amount of hydrogen being produced.
A small amount of the electrical energy input is lost as heat and this is removed from thegenerator by the ventilation system.
The Peak Scientific hydrogen generator generates hydrogen on demand. By maintaining
the pre-set pressure and using this as a reference value, the generator will produce
the precise amount of hydrogen required. As soon as the demand ceases, no furtherhydrogen will be sent to the user’s application. During this time bubbles may still beobserved in the water tank. This is due to the generator maintaining its internal pressureand ensuring that clean, dry hydrogen is available immediately on demand when theuser requires it.

Page 21

Unpacking
Although Peak Scientific takes every precaution with safe transit and packaging, it isadvisable to fully inspect the unit for any sign of transit damage.
Any damage should be reported immediately to the carrier and Peak Scientific or thePeak Partner from where the unit was purchased.
Follow the unpacking instructions posted on the side of the crate.
Please save the product packaging for storage or future shipment of the generator.
The generator is safe to be unpacked by one person providing safe lifting practices are
employed.
Note: Included with the Generator is a “Fittings Kit” containing mains power leads for
UK, EU & US and also all the required fittings and warranty registration card. Pleaseuse only the power cords supplied, or a correctly rated power cord suitable for mains
connection. Be careful not to discard the contents of the fittings kit.

Page 22

Fittings Kit Contents
Supplied in the Fittings Kit are all the fittings required to connect the generator to theapplication. The contents of the Fittings Kit are as follows:
1. Tygon Tubing*								x 1m
2. Barbed Hose Fitting*							x 13. UK Mains Power Cable						x 14. EU Mains Power Cable						x 15. US Mains Power Cable 110V						

x16. US Mains Power Cable 230V					

x17. Installation Guide– Precision Hydrogen				x1

8. 4 Litre Water Bottle***						x 19. A5 simple user maintenance guide				x1

10. Desiccant Cartridges					

x 1 (1 to be installed prior to first use of generator) (100cc)
x 3 (1 to be installed prior to first use of generator) (200cc)

11. DI cartridge 			x1 (to be installed prior to first use generator)

12. Dryer Cap Removal Tool
* supplied with all models** supplied with automatic and pressure fill models*** optional extra for models with automatic fill
All of the generator output ports are located on the output panel at the rear of thegenerator.

Page 23

Installation
Location
The generator should be located on a flat, level surface for operation - this will ensurethat the water level sensors within the unit operate correctly. Some components in thegenerator produce heat during operation and therefore an adequate airflow must be
maintained around the generator to allow the ventilation system to perform efficiently.
If the generator is stored in an enclosed space the environment must be controlled via
an air conditioner or extraction fan. The provision must be made to allow the volume
of air in the room to be changed 5 times per hour. The risk with hydrogen is a leak into
the environment raising the hydrogen content to the explosive limit. The rear of thegenerator will become warm to the touch during operation - a minimum clearance of 15
cm (6”) from other bodies is recommended.
Do not obstruct or connect the vents to any application. Failing to observe this could
lead to permanent damage of the generator.
Do not expose the unit to freezing conditions. Please adhere to the operating
temperatures below:
Do not position the equipment so that it is difficult to disconnect the mains plug.
Minimum Operating Ambient Temperature:

10 °C (50 °F)

Maximum Operating Ambient Temperature:

35 °C (95 °F)

Page 24

Generator Overview
General Dimensions
160 mm / 6.3”

250mm / 9.8”385 mm / 15.2”

WARNING

Page 25

The Generator must always be placed on a flat, level surface. Failure to
do so will affect the performance of the Generator.

Unit Controls

Start Button

Rear Connections

Power Switch and Inlet

H2 Output
H2 Vent

Water Fill
(autofill and pressurized fill units only)
Water Drain

Page 26

WARNING

Ensure all inlets and outlets are connected to correct sources andapplications

WARNINGAll connections should only be made by personnel who are technicallycompetent to do so

WARNING

Generator must be switched off and unplugged prior to any cleaning ormaintenance operations

Tubing
For the hydrogen supply line, it is recommended that only clean grade copper orstainless steel tubing should be used.
Plastic tubing material such as Teflon®, polyvinyl chloride, or Tygon® should not be used
when plumbing GCs since these materials will allow air and water to diffuse into the gaslines. In addition, plastic tubing can give off organic impurities which can cause ghost
peaks and baseline instability.
Furthermore Peak Scientific recommend that compression fittings are used, and that thefittings are free from Teflon® tape.

H2 Ventilation
Peak Scientific recommends that the H2 Exhaust port at the rear of the unit should beconnected to an exhaust hood, or other ventilation system, to ensure safe disposal ofvented gasses. Tubing sizes for the vent port are 6mm OD.

Water Quality
Use only High Grade Deionised water, which must have a conductivity of less than orequal to 1μS/cm (>1 MΩ-cm) @ 20°C and should be replaced as required. Water quality
should be checked prior to being used to supply the Precision Hydrogen Generator.
Use of water in the Precision Hydrogen Generator with a purity not specified above will
result in a reduced efficiency of hydrogen production, failure of the generator and loss of
warranty.
Water should be stored in a UV protected dark container away from direct sunlight. The
bottle should have a vented lid to minimise any dust or debris contaminating the watersupply. A suitable external water bottle is available from Peak Scientific.
Note: Customers should check the water quality of the external water supply once aweek to maintain the health of the generator.
Page 27

Manual Water Tank Filling
The generator must be filled with DI water to be functional. For manual fill systems,
follow the below steps.
1. Lift the hinged lid back, then remove the tank cover.

2. Fill the water tank from your lab’s supply of DI water, and ensure the tank cover isreplaced, afterwards.

3. Close the hinged lid.

Page 28

Automatic Filling (Automatic Fill Upgrade units only)
The Precision Hydrogen generator uses an automatic water filling system as an optional
upgrade, whereby sensors in the unit’s internal water tank detect when the water level
reaches a minimum.
This then refills the tank using a rear connection to an external DI water supply.
The unit should be connected to the water supply as shown below.
Using the length of FEP tubing and the hose barb fitting from the fittings kit, attach thebarb to the tubing. Then connect one end to the water supply and the other to the Fillport at the rear of the Precision Hydrogen.
For efficient water filling the external supply should be no more than 2 metres awayfrom the connection on the generator.

WARNINGWARNINGThe DI Water Supply source MUST NOT be located higher than theheight of the surface that the Precision Hydrogen generator is placed
upon. Please also ensure that the water level within the external watersupply is not higher than the internal tank in Precision SL to avoid
gravity feeding.
A supply located higher than specified will result in the generator’sinternal water bottle over filling.

/×

Page 29×Due to normal setting and performance tolerances, the settled level at which water fillstops may vary from generator to generator. If the generator cannot load enough water
to switch the sensors in the water bottle the generator will illuminate amber and cease
generating hydrogen until the fault has been resolved.
To resolve this, check your external supply before cycling the power on the generator.
Once the low level water sensor disengages the generator will then begin producing
hydrogen as before.
Four and eight litre water storage bottles can be purchased from Peak Scientific, pleasecontact your Sales Representative for more information.

Page 30

Draining the Water Tank
1. Before draining the generator, ensure that you have tubing with a barbed connector
and a vessel to collect drained water
2. Connect tubing to the ‘Drain’ port on the rear of the Precision Hydrogen generator
using the barbed fitting with loose end in the vessel
3. Once the barbed fitting is inserted into the drain connector, water will drain from thegenerator’s internal tank into the vessel
4. Fill the external water bottle with fresh DI water (ASTM type II)
5. Once the internal tank of the generator is emptied, connect the barbed connector tothe ‘Fill’ port of the generator and the generator will automatically draw water fromthe external water bottle

Page 31

Water Usage
The water consumption rate of the Precision Hydrogen Generator is completelydependent on the rate at which the hydrogen is produced.
The graphs below show an estimation of the water consumption from the generator inStand-by mode through to maximum Hydrogen output.

Page 32Electrical Connection
Connect the generator into an appropriate electricity supply, between 100-240VAC.
Refer to the generator serial plate for input specification and ensure your supply
matches the requirements.
If the appropriate power cord is not supplied; a new CSA, UL approved power cord,
rated to at least 10 amps, can be fitted by a qualified electrician. If a substitute main
supply cord is used, ensure that it has adequate ratings and appropriate approvals forthe country of operation. Failure to do so could cause damage to the generator or riskof overloading of the power cord.

WARNING

This unit is classified as SAFETY CLASS 1. THIS UNIT MUST BE
EARTHED. Before connecting the unit to the mains supply, pleasecheck the information on the serial plate. The mains supply must be of
the stated AC voltage and frequency.

EARTH/GROUND (E):-		

Green & Yellow

or

Green

LIVE (L):-				

Brown

or

Black

Neutral (N):-			

Blue

or

White

Page 33

		Start-up Sequence
CHECK:
1.

H2 Outlet is connected to application2.

Mains power is connected

Turn the power switch ON. The water tank will light up, the cooling fan will rotate andthe generator will exhaust any stored hydrogen.
On power up the generator will check the water level, once the water level is at theminimum level required the generator will perform a diagnostic check including aleak test, this should take approximately six minutes and during this time the tankillumination will cycle from dim to brightUpon successful completion of the leak test, the tank illumation will turn solid green andthe generator is ready to deliver hydrogen.
Once the generator is at pressure, the delivery valve may be toggled by momentarilypressing the front button. Bubbles will be visible through the viewing window when thegenerator is producing hydrogen. At low output flows bubbles may be intermittent as
the electrolysis cell control modulates to maintain system pressure.
The generator may be restored to a depressurized state by pressing and holding thefront button for at least three seconds. This will cause the generator to cease hydrogenproduction, illuminate the water tank blue, and exhaust any stored hydrogen through theexhaust port at the rear of the generator.
Note: If leak test is unsuccessful, the water tank will illuminate amber and the generator willcease attempting to produce hydrogen. The user should contact their Peak service provider.

Liquid Leak Detectors
Liquid leak detectors should not be used on the Precision Hydrogen. These solutions areeasily drawn into the high purity hydrogen gas system and can cause contamination of
the system. If a liquid solution has to be used, then it should be IPA based, or a portablehydrogen detector should be used.

Gas Traps
It is recommended to follow the best practice advice from your instrument manufacturer.
For hydrogen supplied to GC detectors, a hydrocarbon trap is normally recommended,however, hydrogen produced by Precision Hydrogen generators is hydrocarbon-free andhydrocarbon traps should not be necessary.

Page 34

Switching the Unit Off
The unit can be switched off at any time using the following procedure.
The generator may be restored to a depressurized state by pressing and holding thefront button for at least three seconds. This will cause the generator to cease hydrogenproduction, illuminate the water tank blue, and exhaust any stored hydrogen through theexhaust port at the rear of the generator. The generator may then be switched off by thepower switch on the rear panel.

Cleaning
Clean the outside of the generator, using only warm soapy water and a clean damp
cloth. Ensure the cloth is thoroughly rung out to remove excess fluid prior to use.
Cleaning should only be undertaken with the power switched off andthe power cord removed from the rear of the Generator.
Under no circumstances should any solvents or abrasive cleaning
solutions be used as these can contain fumes that could be harmful to
the Generator and lab personnel.
CAUTION

Water tank should be cleaned as a minimum on an annual basis in line with instructions
given in step 2 of the DI cartridge change instructions.
For automatic and pressure fill models, the inline water filter may be cleaned byremoving from the rear of the generator and running clean deionised water backwards
through the filter.

Page 35

De-ionizer cartridge Replacement
DI cartridge requires an annual change, although it should also be changed if thewater supply is contaminated with water of a conductivity above the specified limit.
Replacement of the DI column (the column in the middle of the water tank) is byrotating 90° anti-clockwise then pulling up and out of the tank. The new cartridge is
put in by lowering into the recess and twisting 90° clockwise to lock in position. Please
ensure that the DI cartridge is fully wet before it is installed.
1. Depressurise the generator and disconnect power. To replace the DI cartridge, lift
the hinged lid back, then remove the de-ionizer column by turning 90° anticlockwise
and pulling upwards..

2. Drain the tank using the drain port on the rear of the generator. Once tank is empty,
wipe down with a clean, lint-free cloth.
3. Lower the new DI cartridge into the recess and rotate 90° clockwise to lock inposition, then close the lid.

4. The unit can now be re-filled with water and switched on.

Page 36

Replacement of Desiccant Capsule
The desiccant capsule has a minimum expected life of 12 weeks. The capsule consistsof molecular sieve interspersed with silica gel, viewable through the window on the sideof the generator. The capsule should be replaced when all of the silica gel has visibly
darkened.

1. To replace the capsule, depressurise the generator and disconnect power. Lift thehinged lid back, then unscrew and remove the capsule cap anticlockwise, using thedryer cap removal tool.
Be careful to avoid injury when unscrewing the capsule cap.
WARNING

2. Next withdraw the inner tube and dispose as per your company’s hazardous waste
disposal policy and MSDS guidelines. The new capsule may now be inserted into theouter collar.

Page 37

3. The cap can then be replaced again using the dryer cap removal tool, ensuring not
to over-tighten the cap and the hinged lid can be closed.

4. The unit can now be switched on.

Page 38

Service Requirements
Service Schedule
Purchase Interval
12 Months

Component
Precision Hydrogen SL 100cc 12 Month Kit
Precision Hydrogen SL 200cc 12 Month Kit

Visit
www.peakscientific.com/ordering

Note: Only Peak approved components should be used.

Service Plans
Peak Scientific offer two service plans. The Complete Service Plan, specifically designed
for generators operated in critical environments, also includes full breakdown cover,guaranteed response times and generator upgrades if available. Our Standard Service
Plan, covering the basic needs of our generators, features special deals on spare parts
and breakdowns.
If you want to know more about our Service Plan options and how we ensure that yourinstrument can run with the maximum uptime and performance, please contact us atmaintenance@peakscientific.com

Page 39

General Troubleshooting
ProblemPossible Solution•

Ensure power cord is plugged into theGenerator and that the power socket isturned on.

•

Ensure generator is switch on at rear ofgenerator•

Check the fuse in the power cord plug, if
fitted.

•Contact your service provider

The generator has power, but the water tank is
not illuminated, and no hydrogen is produced•

Contact your service provider.

The generator is not producing hydrogen•

Contact your service provider.

The generator will not switch on.

Overview of LED Colour States
LED Colour State

Fault

Pulsing green•

Building pressure (start-up test)

Solid green (dim)•At pressure, in standby

Solid green (bright)•

At pressure, delivery valve open

Pulsing green / yellow•

Delivery valve open, pressure low

Pulsing blue•

Depressurising

Solid blue•

Depressurised

Solid purple•

Separation tank fault

Pulsing purple•

Hardware communication fault

Pulsing purple•

Pressure transducer fault

Solid amber (immediately on power-on)•

Overpressure

Solid amber (during start-up test)•

Start-up test failed•

Water critical•

Water feed fault•

Capacity Excess (generator fails tomaintain flow)

Pulsing amber

Page 40

Debugging by LED
LED Colour State

Fault

•

Power cycle generator

Solid purple

Separation tank fault•

If fault persists, contact yourservice provider

Pulsing purple

Hardwarecommunication fault•

Contact your service provider

Pulsing purple

Pressure transducer
fault

•

Contact your service provider

Solid amber (immediately on
power-on)Overpressure•

Contact your service provider•

Ensure dryer cap has been
securely replaced (seesection “Replacement of
Desiccant Capsule”)•

Check water quality and ensure
DI column has been replaced
within annual schedule•

Contact your service provider•

Ensure water tank fill level iswithin sight glass window onfront of generator•

Contact your service provider•

Ensure external water sourceis connected•

Contact your service provider•

Check that demand is within
the system’s maximum rated
flow

Solid amber (during start-up
test)

Start-up test failed••

Pulsing amber•

Water critical

Water feed fault•
Capacity Excess(generator fails
to maintain
•
flow)

•

Page 41

Ensure there are no leaks
between generator andapplication
Check water quality andensure DI column has been
replaced within annual
schedule
Contact your service provider

Go Online or Complete and Return
You can register for your FREE 12 month Warranty with ease online atwww.peakscientific.com/protected.
Alternatively, you can send the completed form to Peak Scientific by post or
email at warranty@peakscientific.com.

Go Online or Complete and Return
You can register for your FREE 12 month Warranty with ease online atwww.peakscientific/protected.
Alternatively, you can send the completed form to Peak Scientific by post or
email at warranty@peakscientific.com.

Product Warranty Registration
Contact name
Email addressCompany
Address
City/town
PostcodeCountry
Telephone
Generator serial #Model typeInstallation date
Do you still use analternative gas solution i.e.
cylinders or bulk liquid?

Yes

What gas requirements do
you have in your lab?

HydrogenNo

NitrogenZero Air

Extend your cover with
Peak Scientific offer comprehensive gas generator after sales support packages.
Peak [Protected] aftercare support can guarantee an on-site response within 72
hours*, genuine parts from our ISO9001 approved factory and a 95% first-time fix
rate. See our enclosed Peak [Protected] leaflet for further information.
Important!
You have 1 month to register your Peak Scientific product from the date of installation. Once registered
the warranty will be honoured for a period of 12 months. If you wish to defer the installation of yourgenerator, you must notify Peak Scientific immediately by emailing warranty@peakscientific.com.
For generators that remain unregistered after 1 month from the shipment date, the warranty will beconsidered active from the date of factory dispatch.
* Complete Plan only






Important!
You have 1 month to register your Peak Scientific product from the date of
installation. Once registered the warranty will be honoured for a period of 12months. If you wish to defer the installation of your generator, you must notify
Peak Scientific immediately by emailing warranty@peakscientific.com. For
generators that remain unregistered after 1 month from the shipment date, thewarranty will be considered active from the date of factory dispatch.

Page 42

Page 43

Peak Scientific has highly trained, fully certified Field Service Engineers located in over 20 countries
across every continent around the world. This allows us to provide an industry-leading rapid response
service to our customers. With [Peak Protected], your laboratory’s productivity becomes our top
priority.
To discuss Peak Protected generator cover and payment options speak to your local Peak
Representative or for further information contact: protected@peakscientific.com

Peak Scientific
Fountain Crescent
Inchinnan Business Park
Inchinnan
PA4 9RE
Scotland, UK
Tel: +44 141 812 8100
Fax: +44 141 812 8200
For further information on any of ourgenerator products please contact
marketing@peakscientific.com
Precision Hydrogen SL User Manual Rev 13 RSID 3516 EN 18/10/24