DRAFT KENYA STANDARD                   KS 2968 : 2022  
                       ICS 91.140.40  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Meter for dispensing liquefied petroleum 
gas (LPG) from cylinder — Specification  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
© KEBS 20 22  Second  Edition 20 22 KS 2968 : 2022  
 
ii  © KEBS 2022  — All rights reserved   
NATIONAL WORKSHOP REPRESENTATION  
 
The following organizations were represented on the Natio nal Workshop Agreement Meeting:  
 
Envirofit International  
Paygo Energy Ltd.  
Energy and Petroleum Regulatory Authority (EPRA)  
Merchant Technical Services (MTS)  
M-Gas Limited  
Galana Oil (K) Ltd.  
Nuclear Power Energy Agency (NuPEA)  
Onstream Technologies Ltd.  
Kenya Industrial Property Institute (KIPI)  
Kenya National Accreditation Service( KENAS)  
Petroleum Institute of East Africa  
Technical University of Kenya  
Kenya Bureau of Standards — Secretariat  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
REVISION OF KENYA STANDARDS  
 
In order to keep ab reast of progress in industry, Kenya Standards shall be regularly reviewed. Suggestions 
for improvements to published standards, addressed to the Managing Director, Kenya Bureau of Standards, 
are welcome.  
 
 
 
 
 
© Kenya Bureau of Standards, 20 22 
 
Copyright. Users are reminded that by virtue of Section 25 of the Copyright Act, Cap. 130 of 2001 of the Laws of Kenya, copyright 
subsists in all Kenya Standards and except as provided under Section 25 of this Act, no Kenya Standard produced by Kenya Bure au of 
Standa rds may be reproduced, stored in a retrieval system in any form or transmitted by any means without prior permission in writi ng 
from the Managing Director.   
 DRAFT KENYA STANDARD              KS 2968 : 2022  
ICS 91.140.40   
© KEBS 2022  — All rights reserved    iii  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Meter for dispensing liquefied petroleum gas 
(LPG) from cylinder — Specification  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
KENYA BUREAU OF STANDARDS (KEBS)  
 
Head Office:  P.O. Box 54974, Nairobi -00200, Tel.: (+254  020) 605490, 602350, Fax: (+254 020)  604031  
E-Mail: info@kebs.org,  Web:http://www.kebs.org   
 
Coast Region     Lake Region          Rift Valley Region  
P.O. Box 99376, Mombasa -80100   P.O. Box 2949, Kisumu -40100        P.O. Box 2138, Nakuru -20100  
Tel.: (+254  041) 229563, 230939/40  Tel.: (+254 057) 23549, 22396        Tel.: (+254 051) 210553, 210555  
Fax: (+254  041) 229448    Fax: (+254 057) 21814  
 KS 2968 : 2022  
 
iv  © KEBS 2022  — All rights reserved  Foreword  
 
This Draft Kenya Standard  was prepared by a Joint Technical Committee  of KEBS TC 105 Instrumentation 
and Calibration Coordination and KEBS TC 117 Liquefied Petroleum G as installations , comprising of Key 
Stakeholders  under the guidance  of the Standa rds Projects Committee , and it is in accordance with the 
procedures of  the Kenya Bureau of Standards.  
 
This meter is a device used for dispensing controlled amounts of liquefied petroleum gas (LPG) from 
cylinders. Measurement of small quantities of vapour LPG and the ability to remotely control access to the 
LPG is a critical function of the meter. The meter is designed  for low pressure applications . 
 
This standard cancel  and replaces KNWA 2885 : 2019 . 
 
 
 
 
 
 
 
  
DRAFT KENYA STANDARD                                        KS 2968 : 2022 
 
 
© KEBS 2022  — All rights reserved    1 Meter for dispensing liquefied petroleum gas (L PG) from cylinder — 
Specification  
 
1 Scope  and field of application  
 
1.1 This draft Kenya Standard  specifies functional and safety requirements for meter  used for di spensing 
metered amounts of LPG  from gas cylinders.  
 
1.2 This standard applies to  low press ure applications only . 
 
1.3 This standard does not cover meters for reticulated or autogas applications . 
 
2 Normative references  
 
The following documents are referred to in the text in such a way that some or all of their content constitutes 
requirements o f this document. For dated references, only the edition cited applies. For undated references, 
the latest edition of the referenced document (including any amendments) applies.  
 
KS 91 , Petroleum and petroleum products  — Liquefied Petroleum Gas (LPG) — Spec ification  
 
KS 2189 , Low pressure liquiefied petroleum gas (LPG) regulator for use with unified valve ― Specification  
 
KS IEC 60079 -10-1, Explosive atmospheres, ― Part 10 -1: Classification of areas ― Explosive gas 
atmosphers  
 
3 Terms and d efinitions  
 
For th e purposes of this document , the terms and definitions given in KS 9 1 and the following apply : 
 
3.1 
telemetry  
process of recording and transmitting the readings of the meter  
 
3.2 
low pressure applications  
applications in which the pressure has been regulat ed in accordance with KS 2189  
 
3.3 
liquefied petroleum gas (LPG)  
as specified in KS 91  
 
3.4 
qualified installer  
person with prerequisite training and knowledge on LPG meter installations  
 
4 Requirements  
 
4.1 Components  
 
4.1.1  Low pressure regulator  
 DRAFT KENYA STANDARD   
2  © KEBS 2022  — All rights reserved  The lo w pressure LPG  regulator incorporated in the meter assembly shall meet the requirements specified in 
KS 2189.  
 
4.1.2  Flow measurement device  
 
4.1.2.1  The flow measurement device shall be compatible with the LPG and meet the accuracy and safety 
requirements  as given in 4.4.3 and 4.3 respectively . 
 
4.1.2.2   The device shall be calibrated to measure the mass flow of the LPG . The measurements sh all be 
traceable to the International System of Units (SI Units) . 
 
4.1.3  Gas shut -off valve  
 
4.1.3.1  Gas shut -off valv e is an electronically controlled valve that controls gas flow.   
 
4.1.3.2   The gas shut -off valve shall be rated for LP G and shall be suitable for use in Zone 2 hazardous 
areas according to KS IEC 60079 -10-1. 
 
4.1.3.3  The gas shut -off valve shall have th e following:  
 
a) Flow range  shall be  ≤ 4 m³/h;  
 
b) Working pressure shall be  6 kPa maximum ; and  
 
c) External seal  shall ensure that there is  no leakage at 10 kPa . 
 
4.1.4 Power supply  
 
4.1.4.1  The batteries shall be used in accordance with the requirements of regulations for Zone 2 explosion -
proof equipment by the intrinsic safety protection method.  
 
4.1.4.2  Batteries shall be securely mounted and protected by the physical enclosure such that safety cannot 
be impaired by any possible leakage of their electrolyte.  
 
4.1.4.3   Battery polarity shall be guaranteed by single direction connectors.  
 
4.1.4.4  The batteries shall be installed , replaced or recharged in accordance with the manufacturer’s 
instructions.   
 
4.1.4.5  Any other power supply other than batteries shall comply with applicable safet y requirements.  
 
4.2 Materials  
 
4.2.1  All components of the meter that come in contact with the LPG shall be compatible for use with the 
LPG.  
 
4.2.2  The meter outer enclosure shall be made from flame retardant material . 
 
4.3 Safety  
 
4.3.1  The meter shall be designed and certified by an accredited third party for use in Zone 2 hazardous 
areas in accord ance with KS IEC 60079 -10-1.  
 KS 2968 : 2022 
 
© KEBS 2022  — All rights reser ved   3 4.3.2  The meter shall be installed by a qualified installer. Installations shall be done at the end consumer’s 
premises.  
 
4.3.3 Safety checks,  user training and safety awareness  for the consumer  shall be provided . 
 
4.3.4  In the event of a fire breakout, the LPG cylinder together with  the meter shall be quickly 
disconnected from the LPG appliance,  to move the unit away from the fire.  
 
4.4 Performance  
 
4.4.1 Coupling  
 
The meter shall be able to be coupled to domestic cylinders  with unified spindle -type valve . However , the 
meter may also be used on higher capacity cylinders for low pressure applications in compliance with the 
applicable LPG regulations . 
 
4.4.2 Compatibility with LPG 
 
The meter components that come into contact with the LPG shall be compatible with LPG composition 
specified in KS 91.  
 
4.4.3 LPG measurement accuracy  
 
The allowable measurement error shall be ± 3  % of amount of LPG in the cylinder for type approval,and ± 6  
% for subsequent verification in service with a flow rate ranging from 0.1  m³/h to 0.5 m³/h  when tested in 
accordance with Annex A . 
 
4.4.4 Disconnection  and reconnection  
 
In the event of power or conn ectivity failure within the meter , disconnection and reconnection of the meter 
from the cylinder shall be done by qualified installer  authorised by the meter owner . 
 
4.4.5 Re-opening the valve after shut -off event  
 
In the event of the automatic valve shutt ing off,  the re -opening of the valve shall only occur with the physical 
pushing of the button on the meter  or any other suitable method .  
 
4.4.6 Credit/mass  display  
 
The meter screen or other display available to the consumer shall display the credit and/or mass balance.  
 
4.4.7 Meter alerts  
 
The meter shall generate alerts  to the consumer on but not limited to the following :  
 
a) when the credit is running low ; and  
 
b) when the LPG is running low.   
 
4.4.8 Calibration security  
 
4.4.8.1 The meter software s hall be encrypted to avoid tampering . 
 DRAFT KENYA STANDARD   
4  © KEBS 2022  — All rights reserved  4.4.8.2 The calibration of the meter shall only be altered by use of the manufacturers’ calibration testing 
procedures.  
 
5 Marking  
 
5.1 The meter shall be indelibly and legibly marked with the following Information.  
a) manufacturers’ name ; 
 
b) registered intellectual property assets such as patents, utility models, industrial designs, trade marks 
or brands;  
 
c) serial number and year of manufacture ; 
 
d) minimum and maximum gas flow  rate in  m3/ h; 
 
e) type of gas for u se (LPG only); 
 
f) maximum working pressure bar;  
 
g) working temperature range;  
 
h) maximum outlet pressure  in kPa; and 
 
i) country of origin . 
 
5.2 Safety literature and instructions for use  shall be provided.  KS 2968 : 2022 
 
© KEBS 2022  — All rights reser ved   5  
Annex A  
(Normative)  
 
Meter accuracy testing  
 
A.1 Principle  
 
A.1.1 To che ck the accuracy of the meter by comparing the flow rate reading on the meter and the flow 
rate reading on a mass flow controller used after the meter.  
 
A.2 Procedure  
 
A.2.1 Assemble the test unit as shown in fig A1 below.  
 
A.2.2  Set the flow rate of the m ass flow controller to a fixed amount between 0.1m3/h-1m3/h 
 
B.2.3  Switch on the LPG and burn/discharge the flow for few minutes to allow for the flow rate to stabilize  
 
A.2.4 Carry out at least three gas burning/discharge sessions to decrease random comp onent of error, 
then calculate the average value of the flow rate burned/discharged.  
 
A.2.5 The variance between the reading on the mass flow controller and the reading from the meter shall 
be as indicated in 4.4.3.  
 
 
Figure A1 
 
 
 
 
 DRAFT KENYA STANDARD   
6  © KEBS 2022  — All rights reserved   
Annex B 
(Informative ) 
 
Additional methods for Meter accuracy testing  
B.1 Principle  
 
To check the accuracy of the meter by comparing actual discharge   of LPG by weighing scale measurement 
against the discharge   displayed on the meter.  
 
B.2 Procedure  
 
B.2.1  Weigh the LPG cylind er with its contents before the start of the experiment and record the mass as 
M1. 
 
B.2.2 Switch on the LPG and discharge /burn  about 500  g of the LPG as indicated on the meter.  
 
B.2.3 Carry out at least three LPG discharging .burning  sessions to decrease ra ndom component of error, 
then calculate the average value of the mass discharged /burned . 
 
B.2.4 The variance between the sum value of the discharged /burned  LPG and the reading from the meter 
shall be as indicated in 4.4.3. 
 
 
 
Figure B.1 ― Illustration of t esting set-up  
 
 
 
Figure B1